├── .gitignore ├── .idea ├── .gitignore ├── .name ├── compiler.xml ├── gradle.xml ├── kotlinc.xml ├── misc.xml └── vcs.xml ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── dalemncy │ │ └── demo │ │ └── sharedpreferences │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── dalemncy │ │ │ └── demo │ │ │ └── sharedpreferences │ │ │ ├── MainActivity.kt │ │ │ ├── SettingsActivity.kt │ │ │ ├── constants │ │ │ └── Constants.kt │ │ │ └── datastore │ │ │ └── SharedPref.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ └── ic_launcher_background.xml │ │ ├── layout │ │ ├── activity_main.xml │ │ └── activity_settings.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 │ │ └── xml │ │ ├── backup_rules.xml │ │ └── data_extraction_rules.xml │ └── test │ └── java │ └── com │ └── dalemncy │ └── demo │ └── sharedpreferences │ └── ExampleUnitTest.kt ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.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 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /shelf/ 3 | /workspace.xml 4 | -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | SharedPreferences Demo -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /.idea/kotlinc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 6 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 10 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Android Kotlin Local Storage with SharedPreferences 2 | 3 | This simple demo app showcases a main activity and a settings activity. Users can save a text value to SharedPreferences in the settings activity, which is then displayed in the main activity. 4 | 5 | ## Key Features 6 | 7 | - Implementation of SharedPreferences for local data storage 8 | - Interaction between main and settings activities 9 | 10 | ## Example Usage 11 | 12 | Clone the repository and open it in Android Studio to explore the implementation. Customize it to learn how to utilize SharedPreferences for data storage in your own Android projects. 13 | 14 | ## Additional Resources 15 | 16 | For more on Android intents, check out my [android-kotlin-intents](https://github.com/dalemncy/android-kotlin-intents) repository. 17 | 18 | ## Contribution 19 | 20 | Contributions are welcome! Feel free to create a pull request for any enhancements or bug fixes you may identify. 21 | 22 | ## License 23 | 24 | This project is licensed under the [MIT License](https://opensource.org/licenses/MIT). 25 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'com.android.application' 3 | id 'org.jetbrains.kotlin.android' 4 | } 5 | 6 | android { 7 | namespace 'com.dalemncy.demo.sharedpreferences' 8 | compileSdk 34 9 | 10 | defaultConfig { 11 | applicationId "com.dalemncy.demo.sharedpreferences" 12 | minSdk 24 13 | targetSdk 34 14 | versionCode 1 15 | versionName "1.0" 16 | 17 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 18 | } 19 | 20 | buildTypes { 21 | release { 22 | minifyEnabled false 23 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 24 | } 25 | } 26 | buildFeatures { 27 | viewBinding true 28 | } 29 | compileOptions { 30 | sourceCompatibility JavaVersion.VERSION_1_8 31 | targetCompatibility JavaVersion.VERSION_1_8 32 | } 33 | kotlinOptions { 34 | jvmTarget = '1.8' 35 | } 36 | } 37 | 38 | dependencies { 39 | 40 | implementation 'androidx.core:core-ktx:1.8.0' 41 | implementation 'androidx.appcompat:appcompat:1.6.1' 42 | implementation 'com.google.android.material:material:1.10.0' 43 | implementation 'androidx.constraintlayout:constraintlayout:2.1.4' 44 | testImplementation 'junit:junit:4.13.2' 45 | androidTestImplementation 'androidx.test.ext:junit:1.1.5' 46 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1' 47 | } -------------------------------------------------------------------------------- /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 -------------------------------------------------------------------------------- /app/src/androidTest/java/com/dalemncy/demo/sharedpreferences/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.dalemncy.demo.sharedpreferences 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.dalemncy.demo.sharedpreferences", appContext.packageName) 23 | } 24 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 15 | 19 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | -------------------------------------------------------------------------------- /app/src/main/java/com/dalemncy/demo/sharedpreferences/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.dalemncy.demo.sharedpreferences 2 | 3 | import android.content.Intent 4 | import androidx.appcompat.app.AppCompatActivity 5 | import android.os.Bundle 6 | import com.dalemncy.demo.sharedpreferences.databinding.ActivityMainBinding 7 | import com.dalemncy.demo.sharedpreferences.datastore.SharedPref 8 | 9 | class MainActivity : AppCompatActivity() { 10 | private lateinit var binding: ActivityMainBinding 11 | 12 | override fun onCreate(savedInstanceState: Bundle?) { 13 | super.onCreate(savedInstanceState) 14 | binding = ActivityMainBinding.inflate(layoutInflater) 15 | setContentView(binding.root) 16 | 17 | binding.settings.setOnClickListener { 18 | val intent = Intent(this, SettingsActivity::class.java) 19 | startActivity(intent) 20 | } 21 | } 22 | 23 | override fun onResume() { 24 | super.onResume() 25 | binding.title.text = SharedPref(this).title 26 | } 27 | } -------------------------------------------------------------------------------- /app/src/main/java/com/dalemncy/demo/sharedpreferences/SettingsActivity.kt: -------------------------------------------------------------------------------- 1 | package com.dalemncy.demo.sharedpreferences 2 | 3 | import androidx.appcompat.app.AppCompatActivity 4 | import android.os.Bundle 5 | import com.dalemncy.demo.sharedpreferences.databinding.ActivitySettingsBinding 6 | import com.dalemncy.demo.sharedpreferences.datastore.SharedPref 7 | 8 | class SettingsActivity : AppCompatActivity() { 9 | 10 | private lateinit var binding: ActivitySettingsBinding 11 | 12 | override fun onCreate(savedInstanceState: Bundle?) { 13 | super.onCreate(savedInstanceState) 14 | binding = ActivitySettingsBinding.inflate(layoutInflater) 15 | setContentView(binding.root) 16 | 17 | val sharedPref = SharedPref(this) 18 | 19 | binding.title.setText(sharedPref.title) 20 | 21 | binding.save.setOnClickListener { 22 | val title = binding.title.text 23 | sharedPref.title = "$title" 24 | 25 | finish() 26 | } 27 | } 28 | } -------------------------------------------------------------------------------- /app/src/main/java/com/dalemncy/demo/sharedpreferences/constants/Constants.kt: -------------------------------------------------------------------------------- 1 | package com.dalemncy.demo.sharedpreferences.constants 2 | 3 | class Constants { 4 | companion object { 5 | const val GENERAL = "GENERAL" 6 | const val PARAM_TITLE = "PARAM_TITLE" 7 | } 8 | } -------------------------------------------------------------------------------- /app/src/main/java/com/dalemncy/demo/sharedpreferences/datastore/SharedPref.kt: -------------------------------------------------------------------------------- 1 | package com.dalemncy.demo.sharedpreferences.datastore 2 | 3 | import android.content.Context 4 | import com.dalemncy.demo.sharedpreferences.constants.Constants 5 | 6 | class SharedPref(context: Context) { 7 | 8 | private val sharedPref = context 9 | .getSharedPreferences(Constants.GENERAL, Context.MODE_PRIVATE) 10 | 11 | var title: String? 12 | set(title: String?) = sharedPref.edit() 13 | .putString(Constants.PARAM_TITLE, title).apply() 14 | get() = sharedPref 15 | .getString(Constants.PARAM_TITLE, "") 16 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 17 | 18 | 28 | 29 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 | 16 | 17 |