Shrink the APK file to 209KB

app/build.gradle

@@ -11,10 +11,12 @@ android {
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        resConfigs "en"
    }
    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
@@ -28,6 +30,5 @@ dependencies {
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    testCompile 'junit:junit:4.12'
}

app/src/main/java/xyz/profunctor/etaandroid/MainActivity.java

@@ -1,10 +1,10 @@
package xyz.profunctor.etaandroid;

import android.support.v7.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import xyz.profunctor.android.ActivityImpl;

public class MainActivity extends AppCompatActivity {
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

app/src/main/res/values/styles.xml

@@ -1,11 +1,7 @@
<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    <style name="AppTheme" parent="android:Theme.Light">
    </style>

</resources>