├── app ├── .gitignore ├── src │ ├── main │ │ ├── res │ │ │ ├── values │ │ │ │ ├── strings.xml │ │ │ │ ├── ids.xml │ │ │ │ ├── colors.xml │ │ │ │ ├── dimens.xml │ │ │ │ └── styles.xml │ │ │ ├── mipmap-hdpi │ │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-mdpi │ │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xhdpi │ │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxhdpi │ │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxxhdpi │ │ │ │ └── ic_launcher.png │ │ │ ├── layout │ │ │ │ ├── layout_photo.xml │ │ │ │ ├── layout_header.xml │ │ │ │ ├── activity_main.xml │ │ │ │ └── layout_post.xml │ │ │ ├── menu │ │ │ │ └── menu_main.xml │ │ │ └── values-w820dp │ │ │ │ └── dimens.xml │ │ ├── java │ │ │ └── com │ │ │ │ └── example │ │ │ │ └── samvidmistry │ │ │ │ └── recyclerviewadditions │ │ │ │ ├── App.java │ │ │ │ ├── BindingAdapters.java │ │ │ │ ├── PostViewHolder.java │ │ │ │ ├── PhotoViewHolder.java │ │ │ │ ├── RecyclerViewHolder.java │ │ │ │ ├── Post.java │ │ │ │ ├── Photo.java │ │ │ │ ├── PhotoListAdapter.java │ │ │ │ ├── PhotoItemDecoration.java │ │ │ │ ├── TextItemDecoration.java │ │ │ │ ├── MainActivity.java │ │ │ │ ├── MainListAdapter.java │ │ │ │ └── GravitySnapHelper.java │ │ └── AndroidManifest.xml │ ├── test │ │ └── java │ │ │ └── com │ │ │ └── example │ │ │ └── samvidmistry │ │ │ └── recyclerviewadditions │ │ │ └── ExampleUnitTest.java │ └── androidTest │ │ └── java │ │ └── com │ │ └── example │ │ └── samvidmistry │ │ └── recyclerviewadditions │ │ └── ExampleInstrumentedTest.java ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── .idea ├── copyright │ └── profiles_settings.xml ├── modules.xml ├── runConfigurations.xml ├── compiler.xml ├── gradle.xml ├── misc.xml └── codeStyleSettings.xml ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── README.md ├── .gitignore ├── gradle.properties ├── gradlew.bat └── gradlew /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | RecyclerViewAdditions 3 | 4 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /app/src/main/res/values/ids.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # RecyclerViewAdditions 2 | The project showing use of different RecyclerView components and use of them. Also used as demo in the medium article. 3 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/samvidmistry/RecyclerViewAdditions/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/workspace.xml 5 | /.idea/libraries 6 | .DS_Store 7 | /build 8 | /captures 9 | .externalNativeBuild 10 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/dimens.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16dp 4 | 16dp 5 | 6 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Mon Dec 28 10:00:20 PST 2015 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/layout/layout_photo.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 10 | 11 | -------------------------------------------------------------------------------- /app/src/main/res/menu/menu_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 9 | -------------------------------------------------------------------------------- /app/src/main/res/values-w820dp/dimens.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 64dp 6 | 7 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/App.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.app.Application; 4 | 5 | import com.bumptech.glide.request.target.ViewTarget; 6 | 7 | /** 8 | * Created by samvidmistry on 11/19/16. 9 | */ 10 | 11 | public class App extends Application { 12 | @Override 13 | public void onCreate() { 14 | super.onCreate(); 15 | ViewTarget.setTagId(R.id.glide_tag); 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /app/src/main/res/layout/layout_header.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 12 | 13 | -------------------------------------------------------------------------------- /app/src/test/java/com/example/samvidmistry/recyclerviewadditions/ExampleUnitTest.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 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() throws Exception { 15 | assertEquals(4, 2 + 2); 16 | } 17 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/BindingAdapters.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.databinding.BindingAdapter; 4 | import android.widget.ImageView; 5 | 6 | import com.bumptech.glide.Glide; 7 | 8 | /** 9 | * Created by samvidmistry on 11/19/16. 10 | */ 11 | 12 | public class BindingAdapters { 13 | 14 | @BindingAdapter("imageUrl") 15 | public static void setImageFromUrl(ImageView imageView, String url) { 16 | Glide.with(imageView.getContext()).load(url).asBitmap().into(imageView); 17 | } 18 | 19 | } 20 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/PostViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.support.v7.widget.RecyclerView; 4 | import android.view.View; 5 | 6 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutPostBinding; 7 | 8 | /** 9 | * Created by samvidmistry on 11/19/16. 10 | */ 11 | 12 | public class PostViewHolder extends RecyclerView.ViewHolder { 13 | LayoutPostBinding mBinding; 14 | 15 | public PostViewHolder(LayoutPostBinding binding) { 16 | super(binding.getRoot()); 17 | mBinding = binding; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/PhotoViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.support.v7.widget.RecyclerView; 4 | import android.view.View; 5 | 6 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutPhotoBinding; 7 | 8 | /** 9 | * Created by samvidmistry on 11/19/16. 10 | */ 11 | 12 | public class PhotoViewHolder extends RecyclerView.ViewHolder { 13 | LayoutPhotoBinding mBinding; 14 | 15 | public PhotoViewHolder(LayoutPhotoBinding binding) { 16 | super(binding.getRoot()); 17 | mBinding = binding; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/RecyclerViewHolder.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.support.v7.widget.RecyclerView; 4 | import android.view.View; 5 | 6 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutHeaderBinding; 7 | 8 | /** 9 | * Created by samvidmistry on 11/19/16. 10 | */ 11 | 12 | public class RecyclerViewHolder extends RecyclerView.ViewHolder { 13 | LayoutHeaderBinding mBinding; 14 | 15 | public RecyclerViewHolder(LayoutHeaderBinding binding) { 16 | super(binding.getRoot()); 17 | mBinding = binding; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in /home/samvidmistry/Android/Sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 18 | 19 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | 3 | # IDE (e.g. Android Studio) users: 4 | # Gradle settings configured through the IDE *will override* 5 | # any settings specified in this file. 6 | 7 | # For more details on how to configure your build environment visit 8 | # http://www.gradle.org/docs/current/userguide/build_environment.html 9 | 10 | # Specifies the JVM arguments used for the daemon process. 11 | # The setting is particularly useful for tweaking memory settings. 12 | org.gradle.jvmargs=-Xmx1536m 13 | 14 | # When configured, Gradle will run in incubating parallel mode. 15 | # This option should only be used with decoupled projects. More details, visit 16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 17 | # org.gradle.parallel=true 18 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/Post.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import com.google.gson.annotations.SerializedName; 4 | import com.orm.SugarRecord; 5 | 6 | /** 7 | * Created by samvidmistry on 11/19/16. 8 | */ 9 | 10 | public class Post extends SugarRecord { 11 | @SerializedName("userId") 12 | private int mUserId; 13 | @SerializedName("title") 14 | private String mTitle; 15 | @SerializedName("body") 16 | private String mBody; 17 | 18 | public int getUserId() { 19 | return mUserId; 20 | } 21 | 22 | public String getTitle() { 23 | return mTitle; 24 | } 25 | 26 | public String getBody() { 27 | return mBody; 28 | } 29 | 30 | @Override 31 | public String toString() { 32 | return mUserId + " " + mTitle; 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/example/samvidmistry/recyclerviewadditions/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.content.Context; 4 | import android.support.test.InstrumentationRegistry; 5 | import android.support.test.runner.AndroidJUnit4; 6 | 7 | import org.junit.Test; 8 | import org.junit.runner.RunWith; 9 | 10 | import static org.junit.Assert.*; 11 | 12 | /** 13 | * Instrumentation test, which will execute on an Android device. 14 | * 15 | * @see Testing documentation 16 | */ 17 | @RunWith(AndroidJUnit4.class) 18 | public class ExampleInstrumentedTest { 19 | @Test 20 | public void useAppContext() throws Exception { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.example.samvidmistry.recyclerviewadditions", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/Photo.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import com.google.gson.annotations.SerializedName; 4 | import com.orm.SugarRecord; 5 | 6 | /** 7 | * Created by samvidmistry on 11/19/16. 8 | */ 9 | 10 | public class Photo extends SugarRecord { 11 | @SerializedName("albumId") 12 | private int mAlbumId; 13 | @SerializedName("title") 14 | private String mTitle; 15 | @SerializedName("url") 16 | private String mUrl; 17 | @SerializedName("thumbnailUrl") 18 | private String mThumbUrl; 19 | 20 | public int getAlbumId() { 21 | return mAlbumId; 22 | } 23 | 24 | public String getTitle() { 25 | return mTitle; 26 | } 27 | 28 | public String getUrl() { 29 | return mUrl; 30 | } 31 | 32 | public String getThumbUrl() { 33 | return mThumbUrl; 34 | } 35 | 36 | public void setThumbUrl(String thumbUrl) { 37 | mThumbUrl = thumbUrl; 38 | } 39 | 40 | public void setUrl(String url) { 41 | mUrl = url; 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 25 5 | buildToolsVersion "25.0.0" 6 | defaultConfig { 7 | applicationId "com.example.samvidmistry.recyclerviewadditions" 8 | minSdkVersion 9 9 | targetSdkVersion 25 10 | versionCode 1 11 | versionName "1.0" 12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 13 | } 14 | buildTypes { 15 | release { 16 | minifyEnabled false 17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 18 | } 19 | } 20 | dataBinding { 21 | enabled true 22 | } 23 | } 24 | 25 | dependencies { 26 | compile fileTree(include: ['*.jar'], dir: 'libs') 27 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 28 | exclude group: 'com.android.support', module: 'support-annotations' 29 | }) 30 | compile 'com.android.support:appcompat-v7:25.0.1' 31 | testCompile 'junit:junit:4.12' 32 | compile 'com.android.support:recyclerview-v7:25.0.1' 33 | compile 'com.github.satyan:sugar:1.5' 34 | compile 'com.github.bumptech.glide:glide:3.7.0' 35 | compile 'com.squareup.picasso:picasso:2.5.2' 36 | compile 'com.squareup.okhttp3:okhttp:3.4.2' 37 | compile 'com.google.code.gson:gson:2.8.0' 38 | } 39 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/PhotoListAdapter.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.net.Uri; 4 | import android.support.v7.widget.RecyclerView; 5 | import android.view.LayoutInflater; 6 | import android.view.ViewGroup; 7 | 8 | import com.bumptech.glide.Glide; 9 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutPhotoBinding; 10 | import com.squareup.picasso.Picasso; 11 | import com.squareup.picasso.UrlConnectionDownloader; 12 | 13 | import java.util.List; 14 | 15 | /** 16 | * Created by samvidmistry on 11/19/16. 17 | */ 18 | 19 | public class PhotoListAdapter extends RecyclerView.Adapter { 20 | private List mPhotos; 21 | 22 | public PhotoListAdapter(List photos) { 23 | mPhotos = photos; 24 | } 25 | 26 | @Override 27 | public PhotoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 28 | return new PhotoViewHolder(LayoutPhotoBinding.inflate( 29 | LayoutInflater.from(parent.getContext()), 30 | parent, 31 | false 32 | )); 33 | } 34 | 35 | @Override 36 | public void onBindViewHolder(PhotoViewHolder holder, int position) { 37 | Picasso.with(holder.mBinding.image.getContext()).load(mPhotos.get(position).getThumbUrl()) 38 | .into(holder.mBinding.image); 39 | } 40 | 41 | @Override 42 | public int getItemCount() { 43 | return mPhotos.size(); 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 11 | 12 | 19 | 20 | 24 | 25 | 32 | 33 | 34 | 35 | 36 | 37 | -------------------------------------------------------------------------------- /app/src/main/res/layout/layout_post.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 7 | 10 | 11 | 12 | 17 | 18 | 29 | 30 | 41 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/PhotoItemDecoration.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.graphics.Canvas; 4 | import android.graphics.Color; 5 | import android.graphics.Paint; 6 | import android.graphics.Rect; 7 | import android.support.v7.widget.RecyclerView; 8 | import android.view.View; 9 | 10 | /** 11 | * Created by samvidmistry on 11/20/16. 12 | */ 13 | 14 | public class PhotoItemDecoration extends RecyclerView.ItemDecoration { 15 | private Rect mRect = new Rect(); 16 | private final Paint mPaint; 17 | 18 | public PhotoItemDecoration() { 19 | mPaint = new Paint(); 20 | mPaint.setAntiAlias(true); 21 | mPaint.setColor(Color.GRAY); 22 | mPaint.setStyle(Paint.Style.STROKE); 23 | mPaint.setStrokeWidth(5f); 24 | } 25 | 26 | @Override 27 | public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { 28 | int save = c.save(); 29 | 30 | int top = 0; 31 | int bottom = parent.getHeight(); 32 | 33 | for (int i = 0, size = parent.getChildCount(); i < size; i++) { 34 | View child = parent.getChildAt(i); 35 | parent.getDecoratedBoundsWithMargins(child, mRect); 36 | mRect.left += 10; 37 | mRect.right -= 10; 38 | mRect.top += 2; 39 | mRect.bottom -= 2; 40 | c.drawRect(mRect, mPaint); 41 | } 42 | 43 | c.restoreToCount(save); 44 | } 45 | 46 | @Override 47 | public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { 48 | outRect.set(10, 0, 10, 0); 49 | } 50 | } 51 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/TextItemDecoration.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.graphics.Canvas; 4 | import android.graphics.Color; 5 | import android.graphics.Paint; 6 | import android.graphics.Path; 7 | import android.graphics.Rect; 8 | import android.support.v7.widget.RecyclerView; 9 | import android.view.View; 10 | 11 | /** 12 | * Created by samvidmistry on 11/20/16. 13 | */ 14 | 15 | public class TextItemDecoration extends RecyclerView.ItemDecoration { 16 | private Rect mRect = new Rect(); 17 | private final Paint mPaint; 18 | private Path mPath; 19 | 20 | public TextItemDecoration() { 21 | mPaint = new Paint(); 22 | mPaint.setAntiAlias(true); 23 | mPaint.setColor(Color.GRAY); 24 | mPaint.setStyle(Paint.Style.STROKE); 25 | mPaint.setStrokeWidth(15f); 26 | } 27 | 28 | @Override 29 | public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { 30 | int save = c.save(); 31 | 32 | for (int i = 0, size = parent.getChildCount(); i < size; i++) { 33 | View child = parent.getChildAt(i); 34 | if (parent.getChildAdapterPosition(child) == 0) { 35 | continue; 36 | } 37 | parent.getDecoratedBoundsWithMargins(child, mRect); 38 | mRect.left += 10; 39 | mRect.right -= 10; 40 | mRect.top += 20; 41 | mRect.bottom -= 20; 42 | c.drawRect(mRect, mPaint); 43 | } 44 | 45 | c.restoreToCount(save); 46 | } 47 | 48 | @Override 49 | public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { 50 | if (parent.getChildAdapterPosition(view) == 0) { 51 | return; 52 | } 53 | outRect.set(25, 25, 25, 25); 54 | } 55 | } 56 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 19 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 46 | 47 | 48 | 49 | 50 | 1.8 51 | 52 | 57 | 58 | 59 | 60 | 61 | 62 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.databinding.DataBindingUtil; 4 | import android.os.AsyncTask; 5 | import android.support.v4.widget.SwipeRefreshLayout; 6 | import android.support.v7.app.AppCompatActivity; 7 | import android.os.Bundle; 8 | import android.view.Menu; 9 | import android.view.MenuItem; 10 | 11 | import com.example.samvidmistry.recyclerviewadditions.databinding.ActivityMainBinding; 12 | import com.google.gson.Gson; 13 | 14 | import java.io.IOException; 15 | import java.util.ArrayList; 16 | import java.util.Arrays; 17 | import java.util.List; 18 | 19 | import okhttp3.OkHttpClient; 20 | import okhttp3.Request; 21 | import okhttp3.Response; 22 | 23 | public class MainActivity extends AppCompatActivity { 24 | ActivityMainBinding mBinding; 25 | OkHttpClient mOkHttpClient; 26 | Gson mGson; 27 | MainListAdapter mAdapter; 28 | 29 | @Override 30 | protected void onCreate(Bundle savedInstanceState) { 31 | super.onCreate(savedInstanceState); 32 | mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main); 33 | 34 | mBinding.swipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 35 | @Override 36 | public void onRefresh() { 37 | new PostAsyncTask().execute(); 38 | } 39 | }); 40 | 41 | mBinding.textList.addItemDecoration(new TextItemDecoration()); 42 | 43 | setSupportActionBar(mBinding.toolbar); 44 | 45 | new PostAsyncTask().execute(); 46 | } 47 | 48 | @Override 49 | public boolean onCreateOptionsMenu(Menu menu) { 50 | getMenuInflater().inflate(R.menu.menu_main, menu); 51 | return true; 52 | } 53 | 54 | @Override 55 | public boolean onOptionsItemSelected(MenuItem item) { 56 | switch (item.getItemId()) { 57 | case R.id.delete: 58 | if (mAdapter != null) { 59 | mAdapter.deleteItems(10); 60 | } 61 | } 62 | return super.onOptionsItemSelected(item); 63 | } 64 | 65 | private class PostAsyncTask extends AsyncTask { 66 | private List mPhotos; 67 | private List mPosts; 68 | 69 | @Override 70 | protected void onPreExecute() { 71 | mBinding.swipeRefresh.setRefreshing(true); 72 | } 73 | 74 | @Override 75 | protected Void doInBackground(Void... voids) { 76 | if (mOkHttpClient == null) { 77 | mOkHttpClient = new OkHttpClient(); 78 | } 79 | 80 | Request request = new Request.Builder() 81 | .url("https://jsonplaceholder.typicode.com/photos") 82 | .build(); 83 | 84 | Response response; 85 | try { 86 | response = mOkHttpClient.newCall(request).execute(); 87 | } catch (IOException e) { 88 | e.printStackTrace(); 89 | response = null; 90 | } 91 | 92 | if (response == null) { 93 | return null; 94 | } 95 | 96 | if (mGson == null) { 97 | mGson = new Gson(); 98 | } 99 | 100 | Photo[] photos = new Photo[0]; 101 | try { 102 | photos = mGson.fromJson(response.body().string(), Photo[].class); 103 | } catch (IOException e) { 104 | e.printStackTrace(); 105 | } 106 | for (Photo photo : photos) { 107 | photo.setThumbUrl(photo.getThumbUrl().replace("http", "https")); 108 | photo.setUrl(photo.getUrl().replace("http", "https")); 109 | } 110 | mPhotos = new ArrayList<>(Arrays.asList(photos)); 111 | 112 | request = new Request.Builder() 113 | .url("https://jsonplaceholder.typicode.com/posts") 114 | .build(); 115 | 116 | try { 117 | response = mOkHttpClient.newCall(request).execute(); 118 | } catch (IOException e) { 119 | e.printStackTrace(); 120 | response = null; 121 | } 122 | 123 | if (response == null) { 124 | return null; 125 | } 126 | 127 | Post[] posts = new Post[0]; 128 | try { 129 | posts = mGson.fromJson(response.body().string(), Post[].class); 130 | } catch (IOException e) { 131 | e.printStackTrace(); 132 | } 133 | mPosts = new ArrayList<>(Arrays.asList(posts)); 134 | 135 | return null; 136 | } 137 | 138 | @Override 139 | protected void onPostExecute(Void aVoid) { 140 | mBinding.swipeRefresh.setRefreshing(false); 141 | mBinding.textList.setHasFixedSize(true); 142 | mAdapter = new MainListAdapter(mPosts, mPhotos); 143 | mBinding.textList.setAdapter(mAdapter); 144 | } 145 | } 146 | 147 | } 148 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/MainListAdapter.java: -------------------------------------------------------------------------------- 1 | package com.example.samvidmistry.recyclerviewadditions; 2 | 3 | import android.os.AsyncTask; 4 | import android.support.v4.view.GravityCompat; 5 | import android.support.v7.util.DiffUtil; 6 | import android.support.v7.widget.LinearLayoutManager; 7 | import android.support.v7.widget.LinearSnapHelper; 8 | import android.support.v7.widget.OrientationHelper; 9 | import android.support.v7.widget.RecyclerView; 10 | import android.support.v7.widget.SnapHelper; 11 | import android.view.LayoutInflater; 12 | import android.view.ViewGroup; 13 | 14 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutHeaderBinding; 15 | import com.example.samvidmistry.recyclerviewadditions.databinding.LayoutPostBinding; 16 | 17 | import java.util.ArrayList; 18 | import java.util.List; 19 | 20 | /** 21 | * Created by samvidmistry on 11/19/16. 22 | */ 23 | 24 | public class MainListAdapter extends RecyclerView.Adapter { 25 | private List mPosts; 26 | private List mPhotos; 27 | private int mFirstPhoto = 0; 28 | 29 | public MainListAdapter(List posts, List photos) { 30 | mPosts = posts; 31 | mPhotos = photos; 32 | } 33 | 34 | @Override 35 | public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) { 36 | if (holder instanceof RecyclerViewHolder) { 37 | ((RecyclerViewHolder) holder).mBinding.photolist.scrollToPosition(mFirstPhoto); 38 | } 39 | } 40 | 41 | @Override 42 | public void onViewDetachedFromWindow(RecyclerView.ViewHolder holder) { 43 | if (holder instanceof RecyclerViewHolder) { 44 | mFirstPhoto = ((LinearLayoutManager) ((RecyclerViewHolder) holder).mBinding.photolist 45 | .getLayoutManager()).findFirstVisibleItemPosition(); 46 | } 47 | } 48 | 49 | @Override 50 | public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 51 | RecyclerView.ViewHolder viewHolder; 52 | if (viewType == R.layout.layout_header) { 53 | viewHolder = new RecyclerViewHolder(LayoutHeaderBinding.inflate( 54 | LayoutInflater.from(parent.getContext()), 55 | parent, 56 | false 57 | )); 58 | } else { 59 | viewHolder = new PostViewHolder(LayoutPostBinding.inflate( 60 | LayoutInflater.from(parent.getContext()), parent, false)); 61 | } 62 | 63 | return viewHolder; 64 | } 65 | 66 | @Override 67 | public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { 68 | if (holder instanceof RecyclerViewHolder) { 69 | if (((RecyclerViewHolder) holder).mBinding.photolist.getAdapter() == null) { 70 | ((RecyclerViewHolder) holder).mBinding.photolist.setHasFixedSize(true); 71 | ((RecyclerViewHolder) holder).mBinding.photolist.setAdapter( 72 | new PhotoListAdapter(mPhotos) 73 | ); 74 | LinearLayoutManager layoutManager = (LinearLayoutManager) 75 | ((RecyclerViewHolder) holder).mBinding.photolist.getLayoutManager(); 76 | layoutManager.setOrientation(OrientationHelper.HORIZONTAL); 77 | ((RecyclerViewHolder) holder).mBinding.photolist. 78 | addItemDecoration(new PhotoItemDecoration()); 79 | new GravitySnapHelper(GravityCompat.START). 80 | attachToRecyclerView(((RecyclerViewHolder) holder).mBinding.photolist); 81 | } 82 | } else if (holder instanceof PostViewHolder) { 83 | ((PostViewHolder) holder).mBinding.setPost(mPosts.get(holder.getAdapterPosition() - 1)); 84 | ((PostViewHolder) holder).mBinding.executePendingBindings(); 85 | } 86 | } 87 | 88 | public void deleteItems(int count) { 89 | new DiffTask(count).execute(); 90 | } 91 | 92 | @Override 93 | public int getItemCount() { 94 | return mPosts == null ? 0 : mPosts.size() + 1; 95 | } 96 | 97 | @Override 98 | public int getItemViewType(int position) { 99 | if (position == 0) { 100 | return R.layout.layout_header; 101 | } 102 | 103 | return R.layout.layout_post; 104 | } 105 | 106 | private class DiffTask extends AsyncTask { 107 | private int mCount; 108 | 109 | private DiffTask(int count) { 110 | mCount = count; 111 | } 112 | 113 | @Override 114 | protected DiffUtil.DiffResult doInBackground(Void... voids) { 115 | final ArrayList posts = new ArrayList<>(mPosts); 116 | for (int i = 0; i < mCount; i++) { 117 | posts.remove(i); 118 | } 119 | 120 | return DiffUtil.calculateDiff(new DiffUtil.Callback() { 121 | @Override 122 | public int getOldListSize() { 123 | return mPosts.size(); 124 | } 125 | 126 | @Override 127 | public int getNewListSize() { 128 | return posts.size(); 129 | } 130 | 131 | @Override 132 | public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) { 133 | return mPosts.get(oldItemPosition).getTitle().equals( 134 | posts.get(newItemPosition).getTitle() 135 | ); 136 | } 137 | 138 | @Override 139 | public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) { 140 | return mPosts.get(oldItemPosition).getBody().equals( 141 | posts.get(newItemPosition).getBody() 142 | ); 143 | } 144 | }); 145 | } 146 | 147 | @Override 148 | protected void onPreExecute() { 149 | 150 | } 151 | 152 | @Override 153 | protected void onPostExecute(DiffUtil.DiffResult result) { 154 | result.dispatchUpdatesTo(MainListAdapter.this); 155 | } 156 | } 157 | 158 | } 159 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/samvidmistry/recyclerviewadditions/GravitySnapHelper.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (C) 2016 The Android Open Source Project 3 | * Copyright (C) 2016 Rúben Sousa 4 | * 5 | * Licensed under the Apache License, Version 2.0 (the "License"); 6 | * you may not use this file except in compliance with the License. 7 | * You may obtain a copy of the License at 8 | * 9 | * http://www.apache.org/licenses/LICENSE-2.0 10 | * 11 | * Unless required by applicable law or agreed to in writing, software 12 | * distributed under the License is distributed on an "AS IS" BASIS, 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 | * See the License for the specific language governing permissions and 15 | * limitations under the License. 16 | */ 17 | package com.example.samvidmistry.recyclerviewadditions; 18 | 19 | import android.annotation.SuppressLint; 20 | import android.support.annotation.NonNull; 21 | import android.support.annotation.Nullable; 22 | import android.support.v7.widget.LinearLayoutManager; 23 | import android.support.v7.widget.LinearSnapHelper; 24 | import android.support.v7.widget.OrientationHelper; 25 | import android.support.v7.widget.RecyclerView; 26 | import android.view.Gravity; 27 | import android.view.View; 28 | 29 | 30 | public class GravitySnapHelper extends LinearSnapHelper { 31 | 32 | private OrientationHelper verticalHelper; 33 | private OrientationHelper horizontalHelper; 34 | private int gravity; 35 | private boolean isSupportRtL; 36 | 37 | @SuppressLint("RtlHardcoded") 38 | public GravitySnapHelper(int gravity) { 39 | this.gravity = gravity; 40 | if (this.gravity == Gravity.LEFT) { 41 | this.gravity = Gravity.START; 42 | } else if (this.gravity == Gravity.RIGHT) { 43 | this.gravity = Gravity.END; 44 | } 45 | } 46 | 47 | @Override 48 | public void attachToRecyclerView(@Nullable RecyclerView recyclerView) 49 | throws IllegalStateException { 50 | super.attachToRecyclerView(recyclerView); 51 | } 52 | 53 | @Override 54 | public int[] calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager, 55 | @NonNull View targetView) { 56 | int[] out = new int[2]; 57 | 58 | if (layoutManager.canScrollHorizontally()) { 59 | if (gravity == Gravity.START) { 60 | out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager)); 61 | } else { // END 62 | out[0] = distanceToEnd(targetView, getHorizontalHelper(layoutManager)); 63 | } 64 | } else { 65 | out[0] = 0; 66 | } 67 | 68 | if (layoutManager.canScrollVertically()) { 69 | if (gravity == Gravity.TOP) { 70 | out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager)); 71 | } else { // BOTTOM 72 | out[1] = distanceToEnd(targetView, getVerticalHelper(layoutManager)); 73 | } 74 | } else { 75 | out[1] = 0; 76 | } 77 | return out; 78 | } 79 | 80 | @Override 81 | public View findSnapView(RecyclerView.LayoutManager layoutManager) { 82 | if (layoutManager instanceof LinearLayoutManager) { 83 | switch (gravity) { 84 | case Gravity.START: 85 | return findStartView(layoutManager, getHorizontalHelper(layoutManager)); 86 | case Gravity.TOP: 87 | return findStartView(layoutManager, getVerticalHelper(layoutManager)); 88 | case Gravity.END: 89 | return findEndView(layoutManager, getHorizontalHelper(layoutManager)); 90 | case Gravity.BOTTOM: 91 | return findEndView(layoutManager, getVerticalHelper(layoutManager)); 92 | } 93 | } 94 | 95 | return super.findSnapView(layoutManager); 96 | } 97 | 98 | private int distanceToStart(View targetView, OrientationHelper helper) { 99 | if (isSupportRtL) { 100 | return distanceToEnd(targetView, helper); 101 | } 102 | return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding(); 103 | } 104 | 105 | private int distanceToEnd(View targetView, OrientationHelper helper) { 106 | if (isSupportRtL) { 107 | return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding(); 108 | } 109 | return helper.getDecoratedEnd(targetView) - helper.getEndAfterPadding(); 110 | } 111 | 112 | private View findStartView(RecyclerView.LayoutManager layoutManager, 113 | OrientationHelper helper) { 114 | 115 | if (layoutManager instanceof LinearLayoutManager) { 116 | int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition(); 117 | 118 | if (firstChild == RecyclerView.NO_POSITION) { 119 | return null; 120 | } 121 | 122 | View child = layoutManager.findViewByPosition(firstChild); 123 | 124 | if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2 125 | && helper.getDecoratedEnd(child) > 0) { 126 | return child; 127 | } else { 128 | if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition() 129 | == layoutManager.getItemCount() - 1) { 130 | return null; 131 | } else { 132 | return layoutManager.findViewByPosition(firstChild + 1); 133 | } 134 | } 135 | } 136 | 137 | return super.findSnapView(layoutManager); 138 | } 139 | 140 | private View findEndView(RecyclerView.LayoutManager layoutManager, 141 | OrientationHelper helper) { 142 | 143 | if (layoutManager instanceof LinearLayoutManager) { 144 | int lastChild = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); 145 | 146 | if (lastChild == RecyclerView.NO_POSITION) { 147 | return null; 148 | } 149 | 150 | View child = layoutManager.findViewByPosition(lastChild); 151 | 152 | if (helper.getDecoratedStart(child) + helper.getDecoratedMeasurement(child) / 2 153 | <= helper.getTotalSpace()) { 154 | return child; 155 | } else { 156 | if (((LinearLayoutManager) layoutManager).findFirstCompletelyVisibleItemPosition() 157 | == 0) { 158 | return null; 159 | } else { 160 | return layoutManager.findViewByPosition(lastChild - 1); 161 | } 162 | } 163 | } 164 | 165 | return super.findSnapView(layoutManager); 166 | } 167 | 168 | private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) { 169 | if (verticalHelper == null) { 170 | verticalHelper = OrientationHelper.createVerticalHelper(layoutManager); 171 | } 172 | return verticalHelper; 173 | } 174 | 175 | private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) { 176 | if (horizontalHelper == null) { 177 | horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager); 178 | } 179 | return horizontalHelper; 180 | } 181 | 182 | } 183 | -------------------------------------------------------------------------------- /.idea/codeStyleSettings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 229 | 231 | --------------------------------------------------------------------------------