From 77718809ef95715dce4b9daa9eb61be87390746b Mon Sep 17 00:00:00 2001
From: Alexander Bakker <ab@alexbakker.me>
Date: Sat, 2 May 2020 14:25:58 +0200
Subject: [PATCH] Minify and optimize the APK using ProGuard

This enables some minification and optimization options to shrink the size of
our APK. A release APK would previously be 12 MB in size, but would now be 8.2
MB.

To test, check if *all* of the functionality of the app still works,
particularly parts that refer to dependencies. You'll know if ProGuard broke
something when the app crashes with a ``ClassNotFoundException`` or similar
exception. I think I've covered all of the cases where ProGuard removed too much
in the rule file.

Also, I was curious why our APK had gotten so large to begin with. I did some
digging and found that this is caused by the SQLCipher dependency. The APK
shrinks down to 2.7 MB without it! We should consider whether having support for
importing from Authenticator Plus is worth the extra 5.5 MB in size.
---
 app/build.gradle       | 17 ++++++++++++++---
 app/proguard-rules.pro |  3 +++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/app/build.gradle b/app/build.gradle
index 2bcf2a14..e30e0a6b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -44,16 +44,27 @@ android {
 
     buildTypes {
         debug {
-            minifyEnabled false
             applicationIdSuffix ".debug"
             manifestPlaceholders = [title: "AegisDev", iconName: "ic_launcher_debug"]
             resValue "bool", "pref_secure_screen_default", "false"
+            postprocessing {
+                removeUnusedCode true
+                removeUnusedResources true
+                obfuscate false
+                optimizeCode false
+                proguardFiles getDefaultProguardFile('proguard-defaults.txt'), 'proguard-rules.pro'
+            }
         }
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             manifestPlaceholders = [title: "Aegis", iconName: "ic_launcher"]
             resValue "bool", "pref_secure_screen_default", "true"
+            postprocessing {
+                removeUnusedCode true
+                removeUnusedResources true
+                obfuscate false
+                optimizeCode true
+                proguardFiles getDefaultProguardFile('proguard-defaults.txt'), 'proguard-rules.pro'
+            }
         }
     }
 
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 429c08f6..dba37a7b 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -15,3 +15,6 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+-keep class com.beemdevelopment.aegis.importers.** { *; }
+-keep class net.sqlcipher.** { *; }