├── .gitattributes ├── Dictionary ├── .gitignore ├── .idea │ ├── .gitignore │ ├── compiler.xml │ ├── gradle.xml │ └── misc.xml ├── app │ ├── .gitignore │ ├── build.gradle │ ├── proguard-rules.pro │ └── src │ │ ├── androidTest │ │ └── java │ │ │ └── com │ │ │ └── example │ │ │ └── dictionary │ │ │ └── ExampleInstrumentedTest.java │ │ ├── main │ │ ├── AndroidManifest.xml │ │ ├── java │ │ │ └── com │ │ │ │ └── example │ │ │ │ └── dictionary │ │ │ │ ├── Adapters │ │ │ │ ├── DefinitionAdapter.java │ │ │ │ ├── MeaningAdapter.java │ │ │ │ └── PhoneticsAdapter.java │ │ │ │ ├── MainActivity.java │ │ │ │ ├── Models │ │ │ │ ├── APIResponse.java │ │ │ │ ├── Definitions.java │ │ │ │ ├── Meanings.java │ │ │ │ └── Phonetics.java │ │ │ │ ├── OnFetchDataListener.java │ │ │ │ ├── RequestManager.java │ │ │ │ └── ViewHolders │ │ │ │ ├── DefinitionViewHolder.java │ │ │ │ ├── MeaningsViewHolder.java │ │ │ │ └── PhoneticViewHolder.java │ │ └── res │ │ │ ├── drawable-v24 │ │ │ └── ic_launcher_foreground.xml │ │ │ ├── drawable │ │ │ ├── ic_launcher_background.xml │ │ │ └── ic_play.xml │ │ │ ├── layout │ │ │ ├── activity_main.xml │ │ │ ├── definitions_list_items.xml │ │ │ ├── meanings_list_items.xml │ │ │ └── phonetic_list_items.xml │ │ │ ├── mipmap-anydpi-v26 │ │ │ ├── ic_launcher.xml │ │ │ └── ic_launcher_round.xml │ │ │ ├── mipmap-hdpi │ │ │ ├── ic_launcher.webp │ │ │ └── ic_launcher_round.webp │ │ │ ├── mipmap-mdpi │ │ │ ├── ic_launcher.webp │ │ │ └── ic_launcher_round.webp │ │ │ ├── mipmap-xhdpi │ │ │ ├── ic_launcher.webp │ │ │ └── ic_launcher_round.webp │ │ │ ├── mipmap-xxhdpi │ │ │ ├── ic_launcher.webp │ │ │ └── ic_launcher_round.webp │ │ │ ├── mipmap-xxxhdpi │ │ │ ├── ic_launcher.webp │ │ │ └── ic_launcher_round.webp │ │ │ ├── values-night │ │ │ └── themes.xml │ │ │ └── values │ │ │ ├── colors.xml │ │ │ ├── strings.xml │ │ │ └── themes.xml │ │ └── test │ │ └── java │ │ └── com │ │ └── example │ │ └── dictionary │ │ └── ExampleUnitTest.java ├── build.gradle ├── gradle.properties ├── gradle │ └── wrapper │ │ ├── gradle-wrapper.jar │ │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle ├── Music_Player ├── MainActivity.java ├── PlayerActivity.java ├── activity_main.xml ├── activity_player.xml └── list_item.xml ├── Open_Whatsapp ├── MainActivity.java └── activity_main.xml ├── README.md └── Scientific_Calculator ├── MainActivity.java ├── activity_main.xml └── eval_func.txt /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | -------------------------------------------------------------------------------- /Dictionary/.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | .cxx 15 | local.properties 16 | -------------------------------------------------------------------------------- /Dictionary/.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /shelf/ 3 | /workspace.xml 4 | -------------------------------------------------------------------------------- /Dictionary/.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /Dictionary/.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 19 | 20 | -------------------------------------------------------------------------------- /Dictionary/.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 12 | 13 | 14 | 15 | 16 | 17 | 19 | -------------------------------------------------------------------------------- /Dictionary/app/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /Dictionary/app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'com.android.application' 3 | } 4 | 5 | android { 6 | compileSdk 31 7 | 8 | defaultConfig { 9 | applicationId "com.example.dictionary" 10 | minSdk 24 11 | targetSdk 31 12 | versionCode 1 13 | versionName "1.0" 14 | 15 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 16 | } 17 | 18 | buildTypes { 19 | release { 20 | minifyEnabled false 21 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 22 | } 23 | } 24 | compileOptions { 25 | sourceCompatibility JavaVersion.VERSION_1_8 26 | targetCompatibility JavaVersion.VERSION_1_8 27 | } 28 | } 29 | 30 | dependencies { 31 | 32 | implementation 'androidx.appcompat:appcompat:1.3.1' 33 | implementation 'com.google.android.material:material:1.4.0' 34 | implementation 'androidx.constraintlayout:constraintlayout:2.1.0' 35 | 36 | implementation 'com.squareup.retrofit2:retrofit:2.9.0' 37 | implementation 'com.squareup.retrofit2:converter-gson:2.9.0' 38 | 39 | testImplementation 'junit:junit:4.+' 40 | androidTestImplementation 'androidx.test.ext:junit:1.1.3' 41 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' 42 | } -------------------------------------------------------------------------------- /Dictionary/app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile -------------------------------------------------------------------------------- /Dictionary/app/src/androidTest/java/com/example/dictionary/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary; 2 | 3 | import android.content.Context; 4 | 5 | import androidx.test.platform.app.InstrumentationRegistry; 6 | import androidx.test.ext.junit.runners.AndroidJUnit4; 7 | 8 | import org.junit.Test; 9 | import org.junit.runner.RunWith; 10 | 11 | import static org.junit.Assert.*; 12 | 13 | /** 14 | * Instrumented test, which will execute on an Android device. 15 | * 16 | * @see Testing documentation 17 | */ 18 | @RunWith(AndroidJUnit4.class) 19 | public class ExampleInstrumentedTest { 20 | @Test 21 | public void useAppContext() { 22 | // Context of the app under test. 23 | Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext(); 24 | assertEquals("com.example.dictionary", appContext.getPackageName()); 25 | } 26 | } -------------------------------------------------------------------------------- /Dictionary/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 14 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Adapters/DefinitionAdapter.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Adapters; 2 | 3 | import android.content.Context; 4 | import android.view.LayoutInflater; 5 | import android.view.ViewGroup; 6 | 7 | import androidx.annotation.NonNull; 8 | import androidx.recyclerview.widget.RecyclerView; 9 | 10 | import com.example.dictionary.Models.Definitions; 11 | import com.example.dictionary.R; 12 | import com.example.dictionary.ViewHolders.DefinitionViewHolder; 13 | 14 | import java.util.List; 15 | 16 | public class DefinitionAdapter extends RecyclerView.Adapter { 17 | private Context context; 18 | private List definitionsList; 19 | 20 | public DefinitionAdapter(Context context, List definitionsList) { 21 | this.context = context; 22 | this.definitionsList = definitionsList; 23 | } 24 | 25 | @NonNull 26 | @Override 27 | public DefinitionViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { 28 | return new DefinitionViewHolder(LayoutInflater.from(context).inflate(R.layout.definitions_list_items, parent, false)); 29 | 30 | } 31 | 32 | @Override 33 | public void onBindViewHolder(@NonNull DefinitionViewHolder holder, int position) { 34 | holder.textView_definition.setText("Definition: " + definitionsList.get(position).getDefinition()); 35 | holder.textView_example.setText("Example: " + definitionsList.get(position).getExample()); 36 | StringBuilder synonyms = new StringBuilder(); 37 | StringBuilder antonyms = new StringBuilder(); 38 | 39 | synonyms.append(definitionsList.get(position).getSynonyms()); 40 | antonyms.append(definitionsList.get(position).getAntonyms()); 41 | 42 | holder.textView_synonyms.setText(synonyms); 43 | holder.textView_antonyms.setText(antonyms); 44 | 45 | holder.textView_synonyms.setSelected(true); 46 | holder.textView_antonyms.setSelected(true); 47 | } 48 | 49 | @Override 50 | public int getItemCount() { 51 | return definitionsList.size(); 52 | } 53 | } 54 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Adapters/MeaningAdapter.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Adapters; 2 | 3 | import android.content.Context; 4 | import android.view.LayoutInflater; 5 | import android.view.ViewGroup; 6 | 7 | import androidx.annotation.NonNull; 8 | import androidx.recyclerview.widget.GridLayoutManager; 9 | import androidx.recyclerview.widget.RecyclerView; 10 | 11 | import com.example.dictionary.Models.Meanings; 12 | import com.example.dictionary.R; 13 | import com.example.dictionary.ViewHolders.MeaningsViewHolder; 14 | 15 | import java.util.List; 16 | 17 | public class MeaningAdapter extends RecyclerView.Adapter { 18 | private Context context; 19 | protected List meaningsList; 20 | 21 | public MeaningAdapter(Context context, List meaningsList) { 22 | this.context = context; 23 | this.meaningsList = meaningsList; 24 | } 25 | 26 | @NonNull 27 | @Override 28 | public MeaningsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { 29 | return new MeaningsViewHolder(LayoutInflater.from(context).inflate(R.layout.meanings_list_items, parent, false)); 30 | 31 | } 32 | 33 | @Override 34 | public void onBindViewHolder(@NonNull MeaningsViewHolder holder, int position) { 35 | holder.textView_partsOfSpeech.setText("Parts of Speech: " + meaningsList.get(position).getPartOfSpeech()); 36 | holder.recycler_definitions.setHasFixedSize(true); 37 | holder.recycler_definitions.setLayoutManager(new GridLayoutManager(context, 1)); 38 | DefinitionAdapter definitionAdapter = new DefinitionAdapter(context, meaningsList.get(position).getDefinitions()); 39 | holder.recycler_definitions.setAdapter(definitionAdapter); 40 | } 41 | 42 | @Override 43 | public int getItemCount() { 44 | return meaningsList.size(); 45 | } 46 | } 47 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Adapters/PhoneticsAdapter.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Adapters; 2 | 3 | import android.content.Context; 4 | import android.media.AudioManager; 5 | import android.media.MediaPlayer; 6 | import android.view.LayoutInflater; 7 | import android.view.View; 8 | import android.view.ViewGroup; 9 | import android.widget.Toast; 10 | 11 | import androidx.annotation.NonNull; 12 | import androidx.recyclerview.widget.RecyclerView; 13 | 14 | import com.example.dictionary.Models.Phonetics; 15 | import com.example.dictionary.R; 16 | import com.example.dictionary.ViewHolders.PhoneticViewHolder; 17 | 18 | import java.util.List; 19 | 20 | public class PhoneticsAdapter extends RecyclerView.Adapter { 21 | private Context context; 22 | private List phoneticsList; 23 | 24 | public PhoneticsAdapter(Context context, List phoneticsList) { 25 | this.context = context; 26 | this.phoneticsList = phoneticsList; 27 | } 28 | 29 | @NonNull 30 | @Override 31 | public PhoneticViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { 32 | return new PhoneticViewHolder(LayoutInflater.from(context).inflate(R.layout.phonetic_list_items, parent, false)); 33 | 34 | } 35 | 36 | @Override 37 | public void onBindViewHolder(@NonNull PhoneticViewHolder holder, int position) { 38 | holder.textView_phonetic.setText(phoneticsList.get(position).getText()); 39 | holder.imageButton_audio.setOnClickListener(new View.OnClickListener() { 40 | @Override 41 | public void onClick(View view) { 42 | MediaPlayer player = new MediaPlayer(); 43 | try{ 44 | player.setAudioStreamType(AudioManager.STREAM_MUSIC); 45 | player.setDataSource("https:" + phoneticsList.get(position).getAudio()); 46 | player.prepare(); 47 | player.start(); 48 | } catch (Exception e){ 49 | e.printStackTrace(); 50 | Toast.makeText(context, "Couldn't play audio!", Toast.LENGTH_SHORT).show(); 51 | } 52 | } 53 | }); 54 | } 55 | 56 | @Override 57 | public int getItemCount() { 58 | return phoneticsList.size(); 59 | } 60 | } 61 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary; 2 | 3 | import androidx.appcompat.app.AppCompatActivity; 4 | import androidx.appcompat.widget.SearchView; 5 | import androidx.recyclerview.widget.GridLayoutManager; 6 | import androidx.recyclerview.widget.RecyclerView; 7 | 8 | import android.app.ProgressDialog; 9 | import android.os.Bundle; 10 | import android.widget.TextView; 11 | import android.widget.Toast; 12 | 13 | import com.example.dictionary.Adapters.MeaningAdapter; 14 | import com.example.dictionary.Adapters.PhoneticsAdapter; 15 | import com.example.dictionary.Models.APIResponse; 16 | 17 | public class MainActivity extends AppCompatActivity { 18 | SearchView search_view; 19 | TextView textView_word; 20 | RecyclerView recycler_phonetics, recycler_meanings; 21 | ProgressDialog progressDialog; 22 | PhoneticsAdapter phoneticsAdapter; 23 | MeaningAdapter meaningAdapter; 24 | 25 | @Override 26 | protected void onCreate(Bundle savedInstanceState) { 27 | super.onCreate(savedInstanceState); 28 | setContentView(R.layout.activity_main); 29 | 30 | search_view = findViewById(R.id.search_view); 31 | textView_word = findViewById(R.id.textView_word); 32 | recycler_phonetics = findViewById(R.id.recycler_phonetics); 33 | recycler_meanings = findViewById(R.id.recycler_meanings); 34 | progressDialog = new ProgressDialog(this); 35 | 36 | progressDialog.setTitle("Loading..."); 37 | progressDialog.show(); 38 | RequestManager manager = new RequestManager(MainActivity.this); 39 | manager.getWordMeaning(listener, "hello"); 40 | 41 | search_view.setOnQueryTextListener(new SearchView.OnQueryTextListener() { 42 | @Override 43 | public boolean onQueryTextSubmit(String query) { 44 | progressDialog.setTitle("Fetching response for " + query); 45 | progressDialog.show(); 46 | RequestManager manager = new RequestManager(MainActivity.this); 47 | manager.getWordMeaning(listener, query); 48 | return true; 49 | } 50 | 51 | @Override 52 | public boolean onQueryTextChange(String newText) { 53 | return false; 54 | } 55 | }); 56 | } 57 | 58 | private final OnFetchDataListener listener = new OnFetchDataListener() { 59 | @Override 60 | public void onFetchData(APIResponse apiResponse, String message) { 61 | progressDialog.dismiss(); 62 | if (apiResponse==null){ 63 | Toast.makeText(MainActivity.this, "No data found!!!", Toast.LENGTH_SHORT).show(); 64 | return; 65 | } 66 | showData(apiResponse); 67 | } 68 | 69 | @Override 70 | public void onError(String message) { 71 | progressDialog.dismiss(); 72 | Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show(); 73 | } 74 | }; 75 | 76 | private void showData(APIResponse apiResponse) { 77 | textView_word.setText("Word: " + apiResponse.getWord()); 78 | recycler_phonetics.setHasFixedSize(true); 79 | recycler_phonetics.setLayoutManager(new GridLayoutManager(this, 1)); 80 | phoneticsAdapter = new PhoneticsAdapter(this, apiResponse.getPhonetics()); 81 | recycler_phonetics.setAdapter(phoneticsAdapter); 82 | 83 | recycler_meanings.setHasFixedSize(true); 84 | recycler_meanings.setLayoutManager(new GridLayoutManager(this, 1)); 85 | meaningAdapter = new MeaningAdapter(this, apiResponse.getMeanings()); 86 | recycler_meanings.setAdapter(meaningAdapter); 87 | } 88 | } -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Models/APIResponse.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Models; 2 | 3 | import java.util.List; 4 | 5 | public class APIResponse { 6 | String word = ""; 7 | List phonetics = null; 8 | List meanings = null; 9 | 10 | public String getWord() { 11 | return word; 12 | } 13 | 14 | public void setWord(String word) { 15 | this.word = word; 16 | } 17 | 18 | public List getPhonetics() { 19 | return phonetics; 20 | } 21 | 22 | public void setPhonetics(List phonetics) { 23 | this.phonetics = phonetics; 24 | } 25 | 26 | public List getMeanings() { 27 | return meanings; 28 | } 29 | 30 | public void setMeanings(List meanings) { 31 | this.meanings = meanings; 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Models/Definitions.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Models; 2 | 3 | import java.util.List; 4 | 5 | public class Definitions { 6 | String definition = ""; 7 | String example = ""; 8 | List synonyms = null; 9 | List antonyms = null; 10 | 11 | public List getSynonyms() { 12 | return synonyms; 13 | } 14 | 15 | public void setSynonyms(List synonyms) { 16 | this.synonyms = synonyms; 17 | } 18 | 19 | public List getAntonyms() { 20 | return antonyms; 21 | } 22 | 23 | public void setAntonyms(List antonyms) { 24 | this.antonyms = antonyms; 25 | } 26 | 27 | public String getDefinition() { 28 | return definition; 29 | } 30 | 31 | public void setDefinition(String definition) { 32 | this.definition = definition; 33 | } 34 | 35 | public String getExample() { 36 | return example; 37 | } 38 | 39 | public void setExample(String example) { 40 | this.example = example; 41 | } 42 | } 43 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Models/Meanings.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Models; 2 | 3 | import java.util.List; 4 | 5 | public class Meanings { 6 | String partOfSpeech = ""; 7 | List definitions = null; 8 | 9 | public String getPartOfSpeech() { 10 | return partOfSpeech; 11 | } 12 | 13 | public void setPartOfSpeech(String partOfSpeech) { 14 | this.partOfSpeech = partOfSpeech; 15 | } 16 | 17 | public List getDefinitions() { 18 | return definitions; 19 | } 20 | 21 | public void setDefinitions(List definitions) { 22 | this.definitions = definitions; 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/Models/Phonetics.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.Models; 2 | 3 | public class Phonetics { 4 | String text = ""; 5 | String audio = ""; 6 | 7 | public String getText() { 8 | return text; 9 | } 10 | 11 | public void setText(String text) { 12 | this.text = text; 13 | } 14 | 15 | public String getAudio() { 16 | return audio; 17 | } 18 | 19 | public void setAudio(String audio) { 20 | this.audio = audio; 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/OnFetchDataListener.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary; 2 | 3 | import com.example.dictionary.Models.APIResponse; 4 | 5 | public interface OnFetchDataListener { 6 | void onFetchData(APIResponse apiResponse, String message); 7 | void onError(String message); 8 | } 9 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/RequestManager.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary; 2 | 3 | import android.content.Context; 4 | import android.widget.Toast; 5 | 6 | import com.example.dictionary.Models.APIResponse; 7 | 8 | import java.util.List; 9 | 10 | import retrofit2.Call; 11 | import retrofit2.Callback; 12 | import retrofit2.Response; 13 | import retrofit2.Retrofit; 14 | import retrofit2.converter.gson.GsonConverterFactory; 15 | import retrofit2.http.GET; 16 | import retrofit2.http.Path; 17 | 18 | public class RequestManager { 19 | Context context; 20 | 21 | Retrofit retrofit = new Retrofit.Builder() 22 | .baseUrl("https://api.dictionaryapi.dev/api/v2/") 23 | .addConverterFactory(GsonConverterFactory.create()) 24 | .build(); 25 | 26 | public RequestManager(Context context) { 27 | this.context = context; 28 | } 29 | 30 | public void getWordMeaning(OnFetchDataListener listener, String word){ 31 | CallDictionary callDictionary = retrofit.create(CallDictionary.class); 32 | Call> call = callDictionary.callMeanings(word); 33 | 34 | try{ 35 | call.enqueue(new Callback>() { 36 | @Override 37 | public void onResponse(Call> call, Response> response) { 38 | if (!response.isSuccessful()){ 39 | Toast.makeText(context, "Error!!", Toast.LENGTH_SHORT).show(); 40 | return; 41 | } 42 | listener.onFetchData(response.body().get(0), response.message()); 43 | } 44 | 45 | @Override 46 | public void onFailure(Call> call, Throwable t) { 47 | listener.onError("Request Failed!!"); 48 | } 49 | }); 50 | } catch (Exception e){ 51 | e.printStackTrace(); 52 | Toast.makeText(context, "An Error Occurred!!!", Toast.LENGTH_SHORT).show(); 53 | } 54 | } 55 | 56 | public interface CallDictionary { 57 | @GET("entries/en/{word}") 58 | Call> callMeanings( 59 | @Path("word") String word 60 | ); 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/ViewHolders/DefinitionViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.ViewHolders; 2 | 3 | import android.view.View; 4 | import android.widget.TextView; 5 | 6 | import androidx.annotation.NonNull; 7 | import androidx.recyclerview.widget.RecyclerView; 8 | 9 | import com.example.dictionary.R; 10 | 11 | public class DefinitionViewHolder extends RecyclerView.ViewHolder { 12 | public TextView textView_definition, textView_example, textView_synonyms, textView_antonyms; 13 | public DefinitionViewHolder(@NonNull View itemView) { 14 | super(itemView); 15 | textView_definition = itemView.findViewById(R.id.textView_definition); 16 | textView_example = itemView.findViewById(R.id.textView_example); 17 | textView_synonyms = itemView.findViewById(R.id.textView_synonyms); 18 | textView_antonyms = itemView.findViewById(R.id.textView_antonyms); 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/ViewHolders/MeaningsViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.ViewHolders; 2 | 3 | import android.view.View; 4 | import android.widget.TextView; 5 | 6 | import androidx.annotation.NonNull; 7 | import androidx.recyclerview.widget.RecyclerView; 8 | 9 | import com.example.dictionary.R; 10 | 11 | public class MeaningsViewHolder extends RecyclerView.ViewHolder { 12 | public TextView textView_partsOfSpeech; 13 | public RecyclerView recycler_definitions; 14 | public MeaningsViewHolder(@NonNull View itemView) { 15 | super(itemView); 16 | textView_partsOfSpeech = itemView.findViewById(R.id.textView_partsOfSpeech); 17 | recycler_definitions = itemView.findViewById(R.id.recycler_definitions); 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/java/com/example/dictionary/ViewHolders/PhoneticViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary.ViewHolders; 2 | 3 | import android.view.View; 4 | import android.widget.ImageButton; 5 | import android.widget.TextView; 6 | 7 | import androidx.annotation.NonNull; 8 | import androidx.recyclerview.widget.RecyclerView; 9 | 10 | import com.example.dictionary.R; 11 | 12 | public class PhoneticViewHolder extends RecyclerView.ViewHolder { 13 | public TextView textView_phonetic; 14 | public ImageButton imageButton_audio; 15 | public PhoneticViewHolder(@NonNull View itemView) { 16 | super(itemView); 17 | textView_phonetic = itemView.findViewById(R.id.textView_phonetic); 18 | imageButton_audio = itemView.findViewById(R.id.imageButton_audio); 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/drawable/ic_play.xml: -------------------------------------------------------------------------------- 1 | 7 | 10 | 11 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 | 14 | 21 | 27 | 28 | 29 | 34 | 44 | 48 | 57 | 61 | 62 | 63 | 64 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/layout/definitions_list_items.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 14 | 24 | 34 | 35 | 44 | 58 | 59 | 68 | 82 | 83 | 84 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/layout/meanings_list_items.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 11 | 15 | 16 | 26 | 31 | 32 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/layout/phonetic_list_items.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 11 | 15 | 24 | 31 | 32 | 33 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/mipmap-hdpi/ic_launcher.webp: -------------------------------------------------------------------------------- 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-------------------------------------------------------------------------------- /Dictionary/app/src/main/res/values-night/themes.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #FFBB86FC 4 | #F7CD2E 5 | #F7CD2E 6 | #FF03DAC5 7 | #FF018786 8 | #FF000000 9 | #FFFFFFFF 10 | #F7CD2E 11 | #242B2E 12 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | Dictionary 3 | -------------------------------------------------------------------------------- /Dictionary/app/src/main/res/values/themes.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16 | -------------------------------------------------------------------------------- /Dictionary/app/src/test/java/com/example/dictionary/ExampleUnitTest.java: -------------------------------------------------------------------------------- 1 | package com.example.dictionary; 2 | 3 | import org.junit.Test; 4 | 5 | import static org.junit.Assert.*; 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * @see Testing documentation 11 | */ 12 | public class ExampleUnitTest { 13 | @Test 14 | public void addition_isCorrect() { 15 | assertEquals(4, 2 + 2); 16 | } 17 | } -------------------------------------------------------------------------------- /Dictionary/build.gradle: -------------------------------------------------------------------------------- 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules. 2 | buildscript { 3 | repositories { 4 | google() 5 | mavenCentral() 6 | } 7 | dependencies { 8 | classpath "com.android.tools.build:gradle:7.0.1" 9 | 10 | // NOTE: Do not place your application dependencies here; they belong 11 | // in the individual module build.gradle files 12 | } 13 | } 14 | 15 | task clean(type: Delete) { 16 | delete rootProject.buildDir 17 | } -------------------------------------------------------------------------------- /Dictionary/gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | # AndroidX package structure to make it clearer which packages are bundled with the 15 | # Android operating system, and which are packaged with your app"s APK 16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn 17 | android.useAndroidX=true 18 | # Automatically convert third-party libraries to use AndroidX 19 | android.enableJetifier=true -------------------------------------------------------------------------------- /Dictionary/gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/evanemran/Android_Tutorials/044d1b7ee9b46d638c749cf1c930767a89d8731e/Dictionary/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /Dictionary/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sat Sep 25 02:04:07 BDT 2021 2 | distributionBase=GRADLE_USER_HOME 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip 4 | distributionPath=wrapper/dists 5 | zipStorePath=wrapper/dists 6 | zipStoreBase=GRADLE_USER_HOME 7 | -------------------------------------------------------------------------------- /Dictionary/gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | # 4 | # Copyright 2015 the original author or authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | ## 21 | ## Gradle start up script for UN*X 22 | ## 23 | ############################################################################## 24 | 25 | # Attempt to set APP_HOME 26 | # Resolve links: $0 may be a link 27 | PRG="$0" 28 | # Need this for relative symlinks. 29 | while [ -h "$PRG" ] ; do 30 | ls=`ls -ld "$PRG"` 31 | link=`expr "$ls" : '.*-> \(.*\)$'` 32 | if expr "$link" : '/.*' > /dev/null; then 33 | PRG="$link" 34 | else 35 | PRG=`dirname "$PRG"`"/$link" 36 | fi 37 | done 38 | SAVED="`pwd`" 39 | cd "`dirname \"$PRG\"`/" >/dev/null 40 | APP_HOME="`pwd -P`" 41 | cd "$SAVED" >/dev/null 42 | 43 | APP_NAME="Gradle" 44 | APP_BASE_NAME=`basename "$0"` 45 | 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 48 | 49 | # Use the maximum available, or set MAX_FD != -1 to use that value. 50 | MAX_FD="maximum" 51 | 52 | warn () { 53 | echo "$*" 54 | } 55 | 56 | die () { 57 | echo 58 | echo "$*" 59 | echo 60 | exit 1 61 | } 62 | 63 | # OS specific support (must be 'true' or 'false'). 64 | cygwin=false 65 | msys=false 66 | darwin=false 67 | nonstop=false 68 | case "`uname`" in 69 | CYGWIN* ) 70 | cygwin=true 71 | ;; 72 | Darwin* ) 73 | darwin=true 74 | ;; 75 | MINGW* ) 76 | msys=true 77 | ;; 78 | NONSTOP* ) 79 | nonstop=true 80 | ;; 81 | esac 82 | 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 84 | 85 | 86 | # Determine the Java command to use to start the JVM. 87 | if [ -n "$JAVA_HOME" ] ; then 88 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 89 | # IBM's JDK on AIX uses strange locations for the executables 90 | JAVACMD="$JAVA_HOME/jre/sh/java" 91 | else 92 | JAVACMD="$JAVA_HOME/bin/java" 93 | fi 94 | if [ ! -x "$JAVACMD" ] ; then 95 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 96 | 97 | Please set the JAVA_HOME variable in your environment to match the 98 | location of your Java installation." 99 | fi 100 | else 101 | JAVACMD="java" 102 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 103 | 104 | Please set the JAVA_HOME variable in your environment to match the 105 | location of your Java installation." 106 | fi 107 | 108 | # Increase the maximum file descriptors if we can. 109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 110 | MAX_FD_LIMIT=`ulimit -H -n` 111 | if [ $? -eq 0 ] ; then 112 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 113 | MAX_FD="$MAX_FD_LIMIT" 114 | fi 115 | ulimit -n $MAX_FD 116 | if [ $? -ne 0 ] ; then 117 | warn "Could not set maximum file descriptor limit: $MAX_FD" 118 | fi 119 | else 120 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 121 | fi 122 | fi 123 | 124 | # For Darwin, add options to specify how the application appears in the dock 125 | if $darwin; then 126 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 127 | fi 128 | 129 | # For Cygwin or MSYS, switch paths to Windows format before running java 130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then 131 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 132 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 133 | 134 | JAVACMD=`cygpath --unix "$JAVACMD"` 135 | 136 | # We build the pattern for arguments to be converted via cygpath 137 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 138 | SEP="" 139 | for dir in $ROOTDIRSRAW ; do 140 | ROOTDIRS="$ROOTDIRS$SEP$dir" 141 | SEP="|" 142 | done 143 | OURCYGPATTERN="(^($ROOTDIRS))" 144 | # Add a user-defined pattern to the cygpath arguments 145 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 146 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 147 | fi 148 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 149 | i=0 150 | for arg in "$@" ; do 151 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 152 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 153 | 154 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 155 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 156 | else 157 | eval `echo args$i`="\"$arg\"" 158 | fi 159 | i=`expr $i + 1` 160 | done 161 | case $i in 162 | 0) set -- ;; 163 | 1) set -- "$args0" ;; 164 | 2) set -- "$args0" "$args1" ;; 165 | 3) set -- "$args0" "$args1" "$args2" ;; 166 | 4) set -- "$args0" "$args1" "$args2" "$args3" ;; 167 | 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 168 | 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 169 | 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 170 | 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 171 | 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 172 | esac 173 | fi 174 | 175 | # Escape application args 176 | save () { 177 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 178 | echo " " 179 | } 180 | APP_ARGS=`save "$@"` 181 | 182 | # Collect all arguments for the java command, following the shell quoting and substitution rules 183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 184 | 185 | exec "$JAVACMD" "$@" 186 | -------------------------------------------------------------------------------- /Dictionary/gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%" == "" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%" == "" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if "%ERRORLEVEL%" == "0" goto execute 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto execute 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :execute 68 | @rem Setup the command line 69 | 70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 71 | 72 | 73 | @rem Execute Gradle 74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 75 | 76 | :end 77 | @rem End local scope for the variables with windows NT shell 78 | if "%ERRORLEVEL%"=="0" goto mainEnd 79 | 80 | :fail 81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 82 | rem the _cmd.exe /c_ return code! 83 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 84 | exit /b 1 85 | 86 | :mainEnd 87 | if "%OS%"=="Windows_NT" endlocal 88 | 89 | :omega 90 | -------------------------------------------------------------------------------- /Dictionary/settings.gradle: -------------------------------------------------------------------------------- 1 | dependencyResolutionManagement { 2 | repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS) 3 | repositories { 4 | google() 5 | mavenCentral() 6 | jcenter() // Warning: this repository is going to shut down soon 7 | } 8 | } 9 | rootProject.name = "Dictionary" 10 | include ':app' 11 | -------------------------------------------------------------------------------- /Music_Player/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.music_player; 2 | 3 | import androidx.appcompat.app.AppCompatActivity; 4 | 5 | import android.Manifest; 6 | import android.content.Intent; 7 | import android.os.Bundle; 8 | import android.os.Environment; 9 | import android.view.View; 10 | import android.view.ViewGroup; 11 | import android.widget.AdapterView; 12 | import android.widget.ArrayAdapter; 13 | import android.widget.BaseAdapter; 14 | import android.widget.ListView; 15 | import android.widget.TextView; 16 | 17 | import com.karumi.dexter.Dexter; 18 | import com.karumi.dexter.MultiplePermissionsReport; 19 | import com.karumi.dexter.PermissionToken; 20 | import com.karumi.dexter.listener.PermissionDeniedResponse; 21 | import com.karumi.dexter.listener.PermissionGrantedResponse; 22 | import com.karumi.dexter.listener.PermissionRequest; 23 | import com.karumi.dexter.listener.multi.MultiplePermissionsListener; 24 | import com.karumi.dexter.listener.single.PermissionListener; 25 | 26 | import java.io.File; 27 | import java.util.ArrayList; 28 | import java.util.List; 29 | 30 | public class MainActivity extends AppCompatActivity { 31 | ListView listView; 32 | String[] items; 33 | 34 | @Override 35 | protected void onCreate(Bundle savedInstanceState) { 36 | super.onCreate(savedInstanceState); 37 | setContentView(R.layout.activity_main); 38 | 39 | listView = findViewById(R.id.listViewSong); 40 | 41 | runtimePermission(); 42 | 43 | 44 | } 45 | 46 | public void runtimePermission() 47 | { 48 | Dexter.withContext(this).withPermissions(Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO) 49 | .withListener(new MultiplePermissionsListener() { 50 | @Override 51 | public void onPermissionsChecked(MultiplePermissionsReport multiplePermissionsReport) { 52 | displaySongs(); 53 | } 54 | 55 | @Override 56 | public void onPermissionRationaleShouldBeShown(List list, PermissionToken permissionToken) { 57 | permissionToken.continuePermissionRequest(); 58 | 59 | } 60 | }).check(); 61 | 62 | } 63 | 64 | public ArrayList findSong (File file) 65 | { 66 | ArrayList arrayList = new ArrayList<>(); 67 | 68 | File[] files = file.listFiles(); 69 | 70 | for (File singlefile: files) 71 | { 72 | if (singlefile.isDirectory() && !singlefile.isHidden()) 73 | { 74 | arrayList.addAll(findSong(singlefile)); 75 | } 76 | else 77 | { 78 | if (singlefile.getName().endsWith(".mp3") || singlefile.getName().endsWith(".wav") ) 79 | { 80 | arrayList.add(singlefile); 81 | } 82 | } 83 | } 84 | return arrayList; 85 | } 86 | 87 | void displaySongs() 88 | { 89 | final ArrayList mySongs = findSong(Environment.getExternalStorageDirectory()); 90 | 91 | items = new String[mySongs.size()]; 92 | for (int i = 0; i myAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, items); 98 | listView.setAdapter(myAdapter);*/ 99 | 100 | customAdapter customAdapter = new customAdapter(); 101 | listView.setAdapter(customAdapter); 102 | 103 | listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 104 | @Override 105 | public void onItemClick(AdapterView adapterView, View view, int i, long l) { 106 | String songName = (String) listView.getItemAtPosition(i); 107 | startActivity(new Intent(getApplicationContext(), PlayerActivity.class) 108 | .putExtra("songs", mySongs) 109 | .putExtra("songname", songName) 110 | .putExtra("pos", i)); 111 | } 112 | }); 113 | } 114 | 115 | 116 | class customAdapter extends BaseAdapter 117 | { 118 | 119 | @Override 120 | public int getCount() { 121 | return items.length; 122 | } 123 | 124 | @Override 125 | public Object getItem(int i) { 126 | return null; 127 | } 128 | 129 | @Override 130 | public long getItemId(int i) { 131 | return 0; 132 | } 133 | 134 | @Override 135 | public View getView(int i, View view, ViewGroup viewGroup) { 136 | 137 | View myView = getLayoutInflater().inflate(R.layout.list_item, null); 138 | TextView textsong = myView.findViewById(R.id.txtsongname); 139 | textsong.setSelected(true); 140 | textsong.setText(items[i]); 141 | 142 | return myView; 143 | } 144 | } 145 | } 146 | -------------------------------------------------------------------------------- /Music_Player/PlayerActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.music_player; 2 | 3 | import androidx.annotation.NonNull; 4 | import androidx.appcompat.app.AppCompatActivity; 5 | 6 | import android.animation.AnimatorSet; 7 | import android.animation.ObjectAnimator; 8 | import android.content.Intent; 9 | import android.graphics.PorterDuff; 10 | import android.media.MediaPlayer; 11 | import android.net.Uri; 12 | import android.os.Bundle; 13 | import android.os.Handler; 14 | import android.view.MenuItem; 15 | import android.view.View; 16 | import android.widget.Button; 17 | import android.widget.ImageView; 18 | import android.widget.SeekBar; 19 | import android.widget.TextView; 20 | 21 | import com.gauravk.audiovisualizer.visualizer.BarVisualizer; 22 | 23 | import java.io.File; 24 | import java.util.ArrayList; 25 | 26 | public class PlayerActivity extends AppCompatActivity { 27 | Button btnplay, btnnext, btnprev, btnff, btnfr; 28 | TextView txtsname, txtsstart, txtsstop; 29 | SeekBar seekmusic; 30 | BarVisualizer visualizer; 31 | ImageView imageView; 32 | 33 | String sname; 34 | public static final String EXTRA_NAME = "song_name"; 35 | static MediaPlayer mediaPlayer; 36 | int position; 37 | ArrayList mySongs; 38 | Thread updateseekbar; 39 | 40 | @Override 41 | public boolean onOptionsItemSelected(@NonNull MenuItem item) { 42 | if (item.getItemId()==android.R.id.home) 43 | { 44 | onBackPressed(); 45 | } 46 | return super.onOptionsItemSelected(item); 47 | } 48 | 49 | @Override 50 | protected void onDestroy() { 51 | if (visualizer != null) 52 | { 53 | visualizer.release(); 54 | } 55 | super.onDestroy(); 56 | } 57 | 58 | @Override 59 | protected void onCreate(Bundle savedInstanceState) { 60 | super.onCreate(savedInstanceState); 61 | setContentView(R.layout.activity_player); 62 | 63 | getSupportActionBar().setTitle("Now Playing"); 64 | getSupportActionBar().setDisplayHomeAsUpEnabled(true); 65 | getSupportActionBar().setDisplayShowHomeEnabled(true); 66 | 67 | btnprev = findViewById(R.id.btnprev); 68 | btnnext = findViewById(R.id.btnnext); 69 | btnplay = findViewById(R.id.playbtn); 70 | btnff = findViewById(R.id.btnff); 71 | btnfr = findViewById(R.id.btnfr); 72 | txtsname = findViewById(R.id.txtsn); 73 | txtsstart = findViewById(R.id.txtsstart); 74 | txtsstop = findViewById(R.id.txtsstop); 75 | seekmusic = findViewById(R.id.seekbar); 76 | visualizer = findViewById(R.id.blast); 77 | imageView = findViewById(R.id.imageview); 78 | 79 | if (mediaPlayer != null) 80 | { 81 | mediaPlayer.stop(); 82 | mediaPlayer.release(); 83 | } 84 | 85 | Intent i = getIntent(); 86 | Bundle bundle = i.getExtras(); 87 | 88 | mySongs = (ArrayList) bundle.getParcelableArrayList("songs"); 89 | String songName = i.getStringExtra("songname"); 90 | position = bundle.getInt("pos",0); 91 | txtsname.setSelected(true); 92 | Uri uri = Uri.parse(mySongs.get(position).toString()); 93 | sname = mySongs.get(position).getName(); 94 | txtsname.setText(sname); 95 | 96 | mediaPlayer = MediaPlayer.create(getApplicationContext(), uri); 97 | mediaPlayer.start(); 98 | 99 | updateseekbar = new Thread() 100 | { 101 | @Override 102 | public void run() { 103 | int totalDuration = mediaPlayer.getDuration(); 104 | int currentposition = 0; 105 | 106 | while (currentposition 2 | 9 | 10 | 17 | 18 | 19 | 20 | -------------------------------------------------------------------------------- /Music_Player/activity_player.xml: -------------------------------------------------------------------------------- 1 | 2 | 11 | 12 | 18 | 32 | 33 | 34 | 35 | 41 | 42 | 43 | 44 | 48 | 56 | 57 | 58 | 69 | 70 | 71 | 82 | 83 | 84 | 85 | 86 | 87 | 91 | 94 | 102 | 103 | 112 | 113 | 122 | 123 | 133 | 143 | 144 | 155 | 156 | 157 | 158 | -------------------------------------------------------------------------------- /Music_Player/list_item.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 14 | 15 | 25 | 26 | 27 | 28 | 44 | 45 | 46 | 47 | 48 | 49 | -------------------------------------------------------------------------------- /Open_Whatsapp/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.whtspp; 2 | 3 | import androidx.appcompat.app.AppCompatActivity; 4 | 5 | import android.content.Intent; 6 | import android.content.pm.PackageManager; 7 | import android.net.Uri; 8 | import android.os.Bundle; 9 | import android.view.View; 10 | import android.widget.Button; 11 | import android.widget.Toast; 12 | 13 | public class MainActivity extends AppCompatActivity { 14 | Button btn; 15 | 16 | 17 | @Override 18 | protected void onCreate(Bundle savedInstanceState) { 19 | super.onCreate(savedInstanceState); 20 | setContentView(R.layout.activity_main); 21 | 22 | btn = findViewById(R.id.btn); 23 | 24 | final String num = "+8801521329977"; 25 | final String text = "Hello"; 26 | 27 | btn.setOnClickListener(new View.OnClickListener() { 28 | @Override 29 | public void onClick(View v) { 30 | 31 | boolean installed = isAppInstalled("com.whatsapp"); 32 | 33 | if (installed) 34 | { 35 | Intent intent = new Intent(Intent.ACTION_VIEW); 36 | intent.setData(Uri.parse("http://api.whatsapp.com/send?phone="+num+"&text="+ text)); 37 | startActivity(intent); 38 | } 39 | else 40 | { 41 | Toast.makeText(MainActivity.this, "Whatsapp is not installed!", Toast.LENGTH_SHORT).show(); 42 | } 43 | } 44 | }); 45 | 46 | } 47 | 48 | private boolean isAppInstalled(String s) { 49 | PackageManager packageManager = getPackageManager(); 50 | boolean is_installed; 51 | 52 | try { 53 | packageManager.getPackageInfo(s, PackageManager.GET_ACTIVITIES); 54 | is_installed = true; 55 | } catch (PackageManager.NameNotFoundException e) { 56 | is_installed = false; 57 | e.printStackTrace(); 58 | } 59 | return is_installed; 60 | } 61 | 62 | } 63 | -------------------------------------------------------------------------------- /Open_Whatsapp/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 18 | 19 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Android_Tutorials 2 | all the source code of android tutorials. 3 | -------------------------------------------------------------------------------- /Scientific_Calculator/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.s_calculator; 2 | 3 | import androidx.appcompat.app.AppCompatActivity; 4 | 5 | import android.os.Bundle; 6 | import android.view.View; 7 | import android.widget.Button; 8 | import android.widget.TextView; 9 | 10 | public class MainActivity extends AppCompatActivity { 11 | Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdot,bpi,bequal,bplus,bmin,bmul,bdiv,binv,bsqrt,bsquare,bfact,bln,blog,btan,bcos,bsin,bb1,bb2,bc,bac; 12 | TextView tvmain,tvsec; 13 | String pi = "3.14159265"; 14 | 15 | @Override 16 | protected void onCreate(Bundle savedInstanceState) { 17 | super.onCreate(savedInstanceState); 18 | setContentView(R.layout.activity_main); 19 | 20 | b1 = findViewById(R.id.b1); 21 | b2 = findViewById(R.id.b2); 22 | b3 = findViewById(R.id.b3); 23 | b4 = findViewById(R.id.b4); 24 | b5 = findViewById(R.id.b5); 25 | b6 = findViewById(R.id.b6); 26 | b7 = findViewById(R.id.b7); 27 | b8 = findViewById(R.id.b8); 28 | b9 = findViewById(R.id.b9); 29 | b0 = findViewById(R.id.b0); 30 | bpi = findViewById(R.id.bpi); 31 | bdot = findViewById(R.id.bdot); 32 | bequal = findViewById(R.id.bequal); 33 | bplus = findViewById(R.id.bplus); 34 | bmin = findViewById(R.id.bmin); 35 | bmul = findViewById(R.id.bmul); 36 | bdiv = findViewById(R.id.bdiv); 37 | binv = findViewById(R.id.binv); 38 | bsqrt = findViewById(R.id.bsqrt); 39 | bsquare = findViewById(R.id.bsquare); 40 | bfact = findViewById(R.id.bfact); 41 | bln = findViewById(R.id.bln); 42 | blog = findViewById(R.id.blog); 43 | btan = findViewById(R.id.btan); 44 | bsin = findViewById(R.id.bsin); 45 | bcos = findViewById(R.id.bcos); 46 | bb1 = findViewById(R.id.bb1); 47 | bb2 = findViewById(R.id.bb2); 48 | bc = findViewById(R.id.bc); 49 | bac = findViewById(R.id.bac); 50 | 51 | tvmain = findViewById(R.id.tvmain); 52 | tvsec = findViewById(R.id.tvsec); 53 | 54 | //onclick listeners 55 | b1.setOnClickListener(new View.OnClickListener() { 56 | @Override 57 | public void onClick(View v) { 58 | tvmain.setText(tvmain.getText()+"1"); 59 | } 60 | }); 61 | b2.setOnClickListener(new View.OnClickListener() { 62 | @Override 63 | public void onClick(View v) { 64 | tvmain.setText(tvmain.getText()+"2"); 65 | } 66 | }); 67 | b3.setOnClickListener(new View.OnClickListener() { 68 | @Override 69 | public void onClick(View v) { 70 | tvmain.setText(tvmain.getText()+"3"); 71 | } 72 | }); 73 | b4.setOnClickListener(new View.OnClickListener() { 74 | @Override 75 | public void onClick(View v) { 76 | tvmain.setText(tvmain.getText()+"4"); 77 | } 78 | }); 79 | b5.setOnClickListener(new View.OnClickListener() { 80 | @Override 81 | public void onClick(View v) { 82 | tvmain.setText(tvmain.getText()+"5"); 83 | } 84 | }); 85 | b6.setOnClickListener(new View.OnClickListener() { 86 | @Override 87 | public void onClick(View v) { 88 | tvmain.setText(tvmain.getText()+"6"); 89 | } 90 | }); 91 | b7.setOnClickListener(new View.OnClickListener() { 92 | @Override 93 | public void onClick(View v) { 94 | tvmain.setText(tvmain.getText()+"7"); 95 | } 96 | }); 97 | b8.setOnClickListener(new View.OnClickListener() { 98 | @Override 99 | public void onClick(View v) { 100 | tvmain.setText(tvmain.getText()+"8"); 101 | } 102 | }); 103 | b9.setOnClickListener(new View.OnClickListener() { 104 | @Override 105 | public void onClick(View v) { 106 | tvmain.setText(tvmain.getText()+"9"); 107 | } 108 | }); 109 | b0.setOnClickListener(new View.OnClickListener() { 110 | @Override 111 | public void onClick(View v) { 112 | tvmain.setText(tvmain.getText()+"0"); 113 | } 114 | }); 115 | bdot.setOnClickListener(new View.OnClickListener() { 116 | @Override 117 | public void onClick(View v) { 118 | tvmain.setText(tvmain.getText()+"."); 119 | } 120 | }); 121 | bac.setOnClickListener(new View.OnClickListener() { 122 | @Override 123 | public void onClick(View v) { 124 | tvmain.setText(""); 125 | tvsec.setText(""); 126 | } 127 | }); 128 | bc.setOnClickListener(new View.OnClickListener() { 129 | @Override 130 | public void onClick(View v) { 131 | String val = tvmain.getText().toString(); 132 | val = val.substring(0, val.length() - 1); 133 | tvmain.setText(val); 134 | } 135 | }); 136 | bplus.setOnClickListener(new View.OnClickListener() { 137 | @Override 138 | public void onClick(View v) { 139 | tvmain.setText(tvmain.getText()+"+"); 140 | } 141 | }); 142 | bmin.setOnClickListener(new View.OnClickListener() { 143 | @Override 144 | public void onClick(View v) { 145 | tvmain.setText(tvmain.getText()+"-"); 146 | } 147 | }); 148 | bmul.setOnClickListener(new View.OnClickListener() { 149 | @Override 150 | public void onClick(View v) { 151 | tvmain.setText(tvmain.getText()+"×"); 152 | } 153 | }); 154 | bdiv.setOnClickListener(new View.OnClickListener() { 155 | @Override 156 | public void onClick(View v) { 157 | tvmain.setText(tvmain.getText()+"÷"); 158 | } 159 | }); 160 | bsqrt.setOnClickListener(new View.OnClickListener() { 161 | @Override 162 | public void onClick(View v) { 163 | String val = tvmain.getText().toString(); 164 | double r = Math.sqrt(Double.parseDouble(val)); 165 | tvmain.setText(String.valueOf(r)); 166 | } 167 | }); 168 | bb1.setOnClickListener(new View.OnClickListener() { 169 | @Override 170 | public void onClick(View v) { 171 | tvmain.setText(tvmain.getText()+"("); 172 | } 173 | }); 174 | bb2.setOnClickListener(new View.OnClickListener() { 175 | @Override 176 | public void onClick(View v) { 177 | tvmain.setText(tvmain.getText()+")"); 178 | } 179 | }); 180 | bpi.setOnClickListener(new View.OnClickListener() { 181 | @Override 182 | public void onClick(View v) { 183 | tvsec.setText(bpi.getText()); 184 | tvmain.setText(tvmain.getText()+pi); 185 | } 186 | }); 187 | bsin.setOnClickListener(new View.OnClickListener() { 188 | @Override 189 | public void onClick(View v) { 190 | tvmain.setText(tvmain.getText()+"sin"); 191 | } 192 | }); 193 | bcos.setOnClickListener(new View.OnClickListener() { 194 | @Override 195 | public void onClick(View v) { 196 | tvmain.setText(tvmain.getText()+"cos"); 197 | } 198 | }); 199 | btan.setOnClickListener(new View.OnClickListener() { 200 | @Override 201 | public void onClick(View v) { 202 | tvmain.setText(tvmain.getText()+"tan"); 203 | } 204 | }); 205 | binv.setOnClickListener(new View.OnClickListener() { 206 | @Override 207 | public void onClick(View v) { 208 | tvmain.setText(tvmain.getText()+"^"+"(-1)"); 209 | } 210 | }); 211 | bfact.setOnClickListener(new View.OnClickListener() { 212 | @Override 213 | public void onClick(View v) { 214 | int val = Integer.parseInt(tvmain.getText().toString()); 215 | int fact = factorial(val); 216 | tvmain.setText(String.valueOf(fact)); 217 | tvsec.setText(val+"!"); 218 | } 219 | }); 220 | bsquare.setOnClickListener(new View.OnClickListener() { 221 | @Override 222 | public void onClick(View v) { 223 | double d = Double.parseDouble(tvmain.getText().toString()); 224 | double square = d*d; 225 | tvmain.setText(String.valueOf(square)); 226 | tvsec.setText(d+"²"); 227 | } 228 | }); 229 | bln.setOnClickListener(new View.OnClickListener() { 230 | @Override 231 | public void onClick(View v) { 232 | tvmain.setText(tvmain.getText()+"ln"); 233 | } 234 | }); 235 | blog.setOnClickListener(new View.OnClickListener() { 236 | @Override 237 | public void onClick(View v) { 238 | tvmain.setText(tvmain.getText()+"log"); 239 | } 240 | }); 241 | bequal.setOnClickListener(new View.OnClickListener() { 242 | @Override 243 | public void onClick(View v) { 244 | String val = tvmain.getText().toString(); 245 | String replacedstr = val.replace('÷','/').replace('×','*'); 246 | double result = eval(replacedstr); 247 | tvmain.setText(String.valueOf(result)); 248 | tvsec.setText(val); 249 | } 250 | }); 251 | 252 | } 253 | 254 | //factorial function 255 | int factorial(int n) 256 | { 257 | return (n==1 || n==0) ? 1 : n*factorial(n-1); 258 | } 259 | 260 | 261 | //eval function 262 | public static double eval(final String str) { 263 | return new Object() { 264 | int pos = -1, ch; 265 | 266 | void nextChar() { 267 | ch = (++pos < str.length()) ? str.charAt(pos) : -1; 268 | } 269 | 270 | boolean eat(int charToEat) { 271 | while (ch == ' ') nextChar(); 272 | if (ch == charToEat) { 273 | nextChar(); 274 | return true; 275 | } 276 | return false; 277 | } 278 | 279 | double parse() { 280 | nextChar(); 281 | double x = parseExpression(); 282 | if (pos < str.length()) throw new RuntimeException("Unexpected: " + (char)ch); 283 | return x; 284 | } 285 | 286 | // Grammar: 287 | // expression = term | expression `+` term | expression `-` term 288 | // term = factor | term `*` factor | term `/` factor 289 | // factor = `+` factor | `-` factor | `(` expression `)` 290 | // | number | functionName factor | factor `^` factor 291 | 292 | double parseExpression() { 293 | double x = parseTerm(); 294 | for (;;) { 295 | if (eat('+')) x += parseTerm(); // addition 296 | else if (eat('-')) x -= parseTerm(); // subtraction 297 | else return x; 298 | } 299 | } 300 | 301 | double parseTerm() { 302 | double x = parseFactor(); 303 | for (;;) { 304 | if (eat('*')) x *= parseFactor(); // multiplication 305 | else if (eat('/')) x /= parseFactor(); // division 306 | else return x; 307 | } 308 | } 309 | 310 | double parseFactor() { 311 | if (eat('+')) return parseFactor(); // unary plus 312 | if (eat('-')) return -parseFactor(); // unary minus 313 | 314 | double x; 315 | int startPos = this.pos; 316 | if (eat('(')) { // parentheses 317 | x = parseExpression(); 318 | eat(')'); 319 | } else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers 320 | while ((ch >= '0' && ch <= '9') || ch == '.') nextChar(); 321 | x = Double.parseDouble(str.substring(startPos, this.pos)); 322 | } else if (ch >= 'a' && ch <= 'z') { // functions 323 | while (ch >= 'a' && ch <= 'z') nextChar(); 324 | String func = str.substring(startPos, this.pos); 325 | x = parseFactor(); 326 | if (func.equals("sqrt")) x = Math.sqrt(x); 327 | else if (func.equals("sin")) x = Math.sin(Math.toRadians(x)); 328 | else if (func.equals("cos")) x = Math.cos(Math.toRadians(x)); 329 | else if (func.equals("tan")) x = Math.tan(Math.toRadians(x)); 330 | else if (func.equals("log")) x = Math.log10(x); 331 | else if (func.equals("ln")) x = Math.log(x); 332 | else throw new RuntimeException("Unknown function: " + func); 333 | } else { 334 | throw new RuntimeException("Unexpected: " + (char)ch); 335 | } 336 | 337 | if (eat('^')) x = Math.pow(x, parseFactor()); // exponentiation 338 | 339 | return x; 340 | } 341 | }.parse(); 342 | } 343 | } 344 | -------------------------------------------------------------------------------- /Scientific_Calculator/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 10 | 23 | 24 | 25 | 38 | 39 | 40 | 45 | 50 | 55 | 60 | 71 | 82 | 93 | 104 | 105 | 106 | 111 | 116 | 128 | 140 | 152 | 164 | 176 | 177 | 178 | 183 | 188 | 200 | 212 | 224 | 236 | 247 | 248 | 249 | 254 | 259 | 270 | 281 | 292 | 303 | 304 | 305 | 310 | 315 | 326 | 337 | 348 | 359 | 360 | 361 | 366 | 371 | 382 | 393 | 404 | 415 | 416 | 417 | 422 | 427 | 438 | 449 | 460 | 471 | 472 | 473 | 474 | 475 | 476 | -------------------------------------------------------------------------------- /Scientific_Calculator/eval_func.txt: -------------------------------------------------------------------------------- 1 | //eval function 2 | public static double eval(final String str) { 3 | return new Object() { 4 | int pos = -1, ch; 5 | 6 | void nextChar() { 7 | ch = (++pos < str.length()) ? str.charAt(pos) : -1; 8 | } 9 | 10 | boolean eat(int charToEat) { 11 | while (ch == ' ') nextChar(); 12 | if (ch == charToEat) { 13 | nextChar(); 14 | return true; 15 | } 16 | return false; 17 | } 18 | 19 | double parse() { 20 | nextChar(); 21 | double x = parseExpression(); 22 | if (pos < str.length()) throw new RuntimeException("Unexpected: " + (char)ch); 23 | return x; 24 | } 25 | 26 | // Grammar: 27 | // expression = term | expression `+` term | expression `-` term 28 | // term = factor | term `*` factor | term `/` factor 29 | // factor = `+` factor | `-` factor | `(` expression `)` 30 | // | number | functionName factor | factor `^` factor 31 | 32 | double parseExpression() { 33 | double x = parseTerm(); 34 | for (;;) { 35 | if (eat('+')) x += parseTerm(); // addition 36 | else if (eat('-')) x -= parseTerm(); // subtraction 37 | else return x; 38 | } 39 | } 40 | 41 | double parseTerm() { 42 | double x = parseFactor(); 43 | for (;;) { 44 | if (eat('*')) x *= parseFactor(); // multiplication 45 | else if (eat('/')) x /= parseFactor(); // division 46 | else return x; 47 | } 48 | } 49 | 50 | double parseFactor() { 51 | if (eat('+')) return parseFactor(); // unary plus 52 | if (eat('-')) return -parseFactor(); // unary minus 53 | 54 | double x; 55 | int startPos = this.pos; 56 | if (eat('(')) { // parentheses 57 | x = parseExpression(); 58 | eat(')'); 59 | } else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers 60 | while ((ch >= '0' && ch <= '9') || ch == '.') nextChar(); 61 | x = Double.parseDouble(str.substring(startPos, this.pos)); 62 | } else if (ch >= 'a' && ch <= 'z') { // functions 63 | while (ch >= 'a' && ch <= 'z') nextChar(); 64 | String func = str.substring(startPos, this.pos); 65 | x = parseFactor(); 66 | if (func.equals("sqrt")) x = Math.sqrt(x); 67 | else if (func.equals("sin")) x = Math.sin(Math.toRadians(x)); 68 | else if (func.equals("cos")) x = Math.cos(Math.toRadians(x)); 69 | else if (func.equals("tan")) x = Math.tan(Math.toRadians(x)); 70 | else if (func.equals("log")) x = Math.log10(x); 71 | else if (func.equals("ln")) x = Math.log(x); 72 | else throw new RuntimeException("Unknown function: " + func); 73 | } else { 74 | throw new RuntimeException("Unexpected: " + (char)ch); 75 | } 76 | 77 | if (eat('^')) x = Math.pow(x, parseFactor()); // exponentiation 78 | 79 | return x; 80 | } 81 | }.parse(); 82 | } --------------------------------------------------------------------------------