Strip resource names to reduce apk size

app/build.gradle

@@ -1,3 +1,5 @@
+import java.nio.file.Paths
+
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
@@ -11,6 +13,7 @@ if (localFile.canRead()) {
 
 android {
     compileSdkVersion target_sdk
+    buildToolsVersion build_tool_version
     defaultConfig {
         applicationId "moe.haruue.wadb"
         minSdkVersion min_sdk
@@ -56,6 +59,29 @@ android {
     dependenciesInfo.includeInApk false
 }
 
+def optimizeReleaseResources = task('optimizeReleaseResources').doLast {
+    def aapt2 = Paths.get(project.android.sdkDirectory.path, 'build-tools', project.android.buildToolsVersion, 'aapt2')
+    def zip = Paths.get(project.buildDir.path, 'intermediates',
+            'processed_res', 'release', 'out', "resources-release.ap_")
+    def optimized = new File("${zip}.opt")
+    def cmd = exec {
+        commandLine aapt2, 'optimize', '--collapse-resource-names',
+                '--shorten-resource-paths',
+                '-o', optimized, zip
+        ignoreExitValue false
+    }
+    if (cmd.exitValue == 0) {
+        delete(zip)
+        optimized.renameTo("$zip")
+    }
+}
+
+tasks.whenTaskAdded { task ->
+    if (task.name == 'processReleaseResources') {
+        task.finalizedBy optimizeReleaseResources
+    }
+}
+
 android.applicationVariants.all { variant ->
     variant.outputs.all {
         outputFileName = "wadb-v${variant.versionName}.apk"

gradle.properties

@@ -15,4 +15,4 @@
 #Fri Oct 21 14:57:45 CST 2016
 android.useAndroidX=true
 android.debug.obsoleteApi=true
-android.enableResourceOptimizations=true
+android.enableResourceOptimizations=false

manifest.gradle

@@ -1,6 +1,7 @@
 ext {
-    gradle_plugin_version = '4.1.2'
+    gradle_plugin_version = '4.1.3'
     kotlin_version = '1.4.32'
+    build_tool_version = '30.0.3'
 
     min_sdk = 23
     target_sdk = 30