Release, and minify apk/use proguard properly

app/build.gradle

@@ -24,8 +24,8 @@ android {
         applicationId "com.h.pixeldroid"
         minSdkVersion 23
         targetSdkVersion 30
-        versionCode 9
-        versionName "1.0.alpha8"
+        versionCode 10
+        versionName "1.0.alpha9"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         testInstrumentationRunnerArguments clearPackageData: 'true'
@@ -46,8 +46,10 @@ android {
             testCoverageEnabled true
         }
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            minifyEnabled true
+            shrinkResources true
+            useProguard true
+            proguardFiles 'proguard-rules.pro'
         }
     }
     testOptions {
@@ -64,7 +66,6 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     /**
      * AndroidX dependencies:
@@ -80,7 +81,7 @@ dependencies {
     implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
     implementation 'androidx.navigation:navigation-fragment-ktx:2.3.2'
     implementation 'androidx.navigation:navigation-ui-ktx:2.3.2'
-    implementation 'androidx.paging:paging-runtime-ktx:3.0.0-alpha11'
+    implementation 'androidx.paging:paging-runtime-ktx:3.0.0-alpha12'
     implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.2.0'
     implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.2.0'
     implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.2.0"

app/proguard-rules.pro

@@ -1,21 +1,68 @@
-# 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
+# proguard file largely copied from Tusky's
+# GENERAL OPTIONS (inspired from AOSP's proguard-android-optimize.txt)
 
-# 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 *;
-#}
+# turn on all optimizations except those that are known to cause problems on Android
+-optimizations !code/simplification/cast,!field/*,!class/merging/*
+-optimizationpasses 6
+-allowaccessmodification
+-dontpreverify
 
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-keepattributes *Annotation*
 
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+# keep setters in Views so that animations can still work.
+# see http://proguard.sourceforge.net/manual/examples.html#beans
+-keepclassmembers public class * extends android.view.View {
+    void set*(***);
+    *** get*();
+}
+# We want to keep methods in Activity that could be used in the XML attribute onClick
+-keepclassmembers class * extends android.app.Activity {
+    public void *(android.view.View);
+}
+# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+-keepclassmembers class * implements android.os.Parcelable {
+    public static final ** CREATOR;
+}
+
+# APP SPECIFIC OPTIONS
+
+# keep members of our model classes, they are used in json de/serialization
+-keepclassmembers class com.h.pixeldroid.utils.api.objects.* { *; }
+
+-keep public enum com.h.pixeldroid.utils.api.objects.*$** {
+    **[] $VALUES;
+    public *;
+}
+
+# preserve line numbers for crash reporting
+-keepattributes SourceFile,LineNumberTable
+-renamesourcefileattribute SourceFile
+
+# remove all logging from production apk
+-assumenosideeffects class android.util.Log {
+    public static *** getStackTraceString(...);
+    public static *** d(...);
+    public static *** w(...);
+    public static *** v(...);
+    public static *** i(...);
+}
+-assumenosideeffects class java.lang.String {
+    public static java.lang.String format(...);
+}
+
+# remove some kotlin overhead
+-assumenosideeffects class kotlin.jvm.internal.Intrinsics {
+    static void checkParameterIsNotNull(java.lang.Object, java.lang.String);
+    static void checkExpressionValueIsNotNull(java.lang.Object, java.lang.String);
+    static void throwUninitializedPropertyAccessException(java.lang.String);
+}

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.1'
+        classpath 'com.android.tools.build:gradle:4.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong