fix(android): proguard rules (#5048)

android/capacitor/build.gradle

@@ -32,6 +32,7 @@ android {
         targetSdkVersion project.hasProperty('targetSdkVersion') ? rootProject.ext.targetSdkVersion : 30
         versionCode 1
         versionName "1.0"
+        consumerProguardFiles 'proguard-rules.pro'
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {

android/capacitor/proguard-rules.pro

@@ -5,17 +5,22 @@
 # For more details, see
 #   http://developer.android.com/guide/developing/tools/proguard.html
 
-# 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 *;
-#}
+# Rules for Capacitor v3 plugins and annotations
+ -keep @com.getcapacitor.annotation.CapacitorPlugin public class * {
+     @com.getcapacitor.annotation.PermissionCallback <methods>;
+     @com.getcapacitor.annotation.ActivityCallback <methods>;
+     @com.getcapacitor.annotation.Permission <methods>;
+     @com.getcapacitor.PluginMethod public <methods>;
+ }
 
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
+# Rules for Capacitor v2 plugins and annotations
+# These are deprecated but can still be used with Capacitor for now
+-keep @com.getcapacitor.NativePlugin public class * {
+  @com.getcapacitor.PluginMethod public <methods>;
+}
 
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+# Rules for Cordova plugins
+-keep public class * extends org.apache.cordova.* {
+  public <methods>;
+  public <fields>;
+}