Activate ProGuard; test signed release APK instead of debug

app/build.gradle

@@ -22,7 +22,7 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
         }
         debug {

app/proguard-rules.txt

@@ -1,3 +1,43 @@
--dontwarn java.beans.**
--dontwarn java.lang.**
--dontobfuscate
+-dontwarn java.**
+-dontwarn javax.**
+-dontwarn com.google.auto.**
+-dontwarn com.google.errorprone.annotations.**
+-dontwarn com.google.j2objc.annotations.**
+-dontwarn okio.**
+-dontwarn okhttp3.**
+-dontwarn sun.misc.**
+-dontwarn org.codehaus.mojo.**
+-dontwarn com.google.gson.internal.*
+-dontwarn com.google.common.util.concurrent.*
+-dontwarn com.google.auto.common.*
+-dontwarn org.apache.commons.beanutils.*
+-dontwarn org.isoron.uhabits.HabitsApplication
+
+-dontobfuscate
+
+-keep class sun.misc.Unsafe { *; }
+-keep class org.isoron.** { *; }
+
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Application
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.preference.Preference
+-keep public class * extends android.view.View {
+    public <init>(android.content.Context);
+    public <init>(android.content.Context, android.util.AttributeSet);
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+-keepclassmembers class * extends android.content.Context {
+    public void *(android.view.View);
+    public void *(android.view.MenuItem);
+}
+-keep public class * extends android.app.Activity
+-dontskipnonpubliclibraryclassmembers

app/src/debug/AndroidManifest.xml

@@ -1,39 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
-  ~
-  ~ This file is part of Loop Habit Tracker.
-  ~
-  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
-  ~ it under the terms of the GNU General Public License as published by the
-  ~ Free Software Foundation, either version 3 of the License, or (at your
-  ~ option) any later version.
-  ~
-  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
-  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
-  ~ more details.
-  ~
-  ~ You should have received a copy of the GNU General Public License along
-  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
-  -->
-<manifest
-    package="org.isoron.uhabits"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
-
-    <uses-permission android:name="android.permission.SET_ANIMATION_SCALE"/>
-    <uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
-    <uses-permission android:name="android.permission.WAKE_LOCK"/>
-
-    <uses-permission
-        android:name="android.permission.READ_EXTERNAL_STORAGE"
-        tools:replace="maxSdkVersion"
-        android:maxSdkVersion="99" />
-
-    <uses-permission
-        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        tools:replace="maxSdkVersion"
-        android:maxSdkVersion="99" />
-
-</manifest>