minimize apk size

Signed-off-by: Jerry Chen <jerryc05@qq.com>

.gitignore

@@ -16,3 +16,5 @@
 
 *.jar
 /app/build
+/app/release
+/app/debug

app/build.gradle

@@ -10,19 +10,26 @@ android {
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        resConfigs "xxhdpi"
     }
     buildTypes {
         release {
-            minifyEnabled false
+            zipAlignEnabled true
+            shrinkResources true
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility = 1.8
+        targetCompatibility = 1.8
+    }
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.0.2'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+//    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

app/proguard-rules.pro

@@ -30,7 +30,7 @@
 
 -dontpreverify
 
-#-dontobfuscate
+-dontobfuscate
 
 -assumenosideeffects class android.util.Log {
     public static boolean isLoggable(...);

app/src/main/java/jerryc05/unlockme/MainActivity.java

@@ -1,10 +1,10 @@
 package jerryc05.unlockme;
 
-import androidx.appcompat.app.AppCompatActivity;
 
+import android.app.Activity;
 import android.os.Bundle;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends Activity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {

app/src/main/res/layout/activity_main.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -9,10 +8,10 @@
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>
+        android:layout_alignParentStart="true"
+        android:layout_alignParentTop="true"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentBottom="true"
+        android:gravity="center"
+        android:text="Hello World!" />
+</RelativeLayout>

app/src/main/res/raw/keep.xml

@@ -0,0 +1,2 @@
+<resources xmlns:tools="http://schemas.android.com/tools"
+    tools:shrinkMode="strict" />

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

@@ -1,11 +1,11 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="android:Theme.DeviceDefault.Light.DarkActionBar">
         <!-- Customize your theme here. -->
-        <item name="colorPrimary">@color/colorPrimary</item>
-        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
-        <item name="colorAccent">@color/colorAccent</item>
+<!--        <item name="colorPrimary">@color/colorPrimary</item>-->
+<!--        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>-->
+<!--        <item name="colorAccent">@color/colorAccent</item>-->
     </style>
 
 </resources>