added Dagger 2 usage sample

android/DaggerUsage/.gitignore

@@ -0,0 +1,10 @@
+*.iml
+.gradle
+/local.properties
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

android/DaggerUsage/app/.gitignore

@@ -0,0 +1 @@
+/build

android/DaggerUsage/app/build.gradle

@@ -0,0 +1,33 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    defaultConfig {
+        applicationId "com.hrupin.daggerusage"
+        minSdkVersion 15
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:26.1.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.1'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
+
+    // Dagger 2
+    compile "com.google.dagger:dagger:${daggerVersion}"
+    annotationProcessor "com.google.dagger:dagger-compiler:${daggerVersion}"
+    provided 'javax.annotation:jsr250-api:1.0'
+}

android/DaggerUsage/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android/DaggerUsage/app/src/androidTest/java/com/hrupin/daggerusage/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.hrupin.daggerusage;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.hrupin.daggerusage", appContext.getPackageName());
+    }
+}

android/DaggerUsage/app/src/main/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hrupin.daggerusage">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        android:name=".MyApplication">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/DaggerUsage/app/src/main/java/com/hrupin/daggerusage/MainActivity.java

@@ -0,0 +1,27 @@
+package com.hrupin.daggerusage;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+import javax.inject.Inject;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Inject
+    MySharedPreferences mySharedPreferences;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        ((MyApplication)getApplicationContext()).getMyComponent().inject(this);
+
+        mySharedPreferences.putData("info",10);
+
+        int fromPrefs = mySharedPreferences.getData("info");
+
+        ((TextView)findViewById(R.id.text)).setText("From prefs: " + fromPrefs);
+    }
+}

android/DaggerUsage/app/src/main/java/com/hrupin/daggerusage/MyApplication.java

@@ -0,0 +1,26 @@
+package com.hrupin.daggerusage;
+
+import android.app.Application;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 1/20/18.
+ */
+
+public class MyApplication extends Application {
+
+    private MyComponent myComponent;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+
+        myComponent = DaggerMyComponent.builder()
+                .sharedPreferencesModule(new SharedPreferencesModule(getApplicationContext()))
+                .build();
+    }
+
+    public MyComponent getMyComponent() {
+        return myComponent;
+    }
+
+}

android/DaggerUsage/app/src/main/java/com/hrupin/daggerusage/MyComponent.java

@@ -0,0 +1,15 @@
+package com.hrupin.daggerusage;
+
+import javax.inject.Singleton;
+
+import dagger.Component;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 1/20/18.
+ */
+
+@Singleton
+@Component(modules = SharedPreferencesModule.class)
+public interface MyComponent {
+    void inject(MainActivity mainActivity);
+}

android/DaggerUsage/app/src/main/java/com/hrupin/daggerusage/MySharedPreferences.java

@@ -0,0 +1,26 @@
+package com.hrupin.daggerusage;
+
+import android.content.SharedPreferences;
+
+import javax.inject.Inject;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 1/20/18.
+ */
+
+public class MySharedPreferences {
+    private SharedPreferences mSharedPreferences;
+
+    @Inject
+    public MySharedPreferences(SharedPreferences mSharedPreferences) {
+        this.mSharedPreferences = mSharedPreferences;
+    }
+
+    public void putData(String key, int data) {
+        mSharedPreferences.edit().putInt(key,data).apply();
+    }
+
+    public int getData(String key) {
+        return mSharedPreferences.getInt(key,0);
+    }
+}

android/DaggerUsage/app/src/main/java/com/hrupin/daggerusage/SharedPreferencesModule.java

@@ -0,0 +1,28 @@
+package com.hrupin.daggerusage;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 1/20/18.
+ */
+
+@Module
+public class SharedPreferencesModule {
+    private Context context;
+
+    public SharedPreferencesModule(Context context) {
+        this.context = context;
+    }
+
+    @Provides
+    @Singleton
+    SharedPreferences provideSharedPreferences() {
+        return context.getSharedPreferences("PrefName",Context.MODE_PRIVATE);
+    }
+}

android/DaggerUsage/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1" />
+</vector>