Improve code quality, performance, and Google Play compliance

app/proguard-rules.pro

@@ -8,6 +8,39 @@
 # Keep models intact
 -keep class com.mintris.model.** { *; }
 
+# Keep game classes intact to prevent issues
+-keep class com.mintris.game.** { *; }
+
+# Preserve critical classes that might be used through reflection
+-keep class com.mintris.audio.GameMusic { *; }
+-keep class com.mintris.ui.** { *; }
+
+# Keep all public methods in the MainActivity
+-keepclassmembers class com.mintris.MainActivity {
+    public *;
+}
+
+# Keep serializable and parcelable classes for proper game state saving
+-keepnames class * implements java.io.Serializable
+-keepclassmembers class * implements java.io.Serializable {
+    static final long serialVersionUID;
+    private static final java.io.ObjectStreamField[] serialPersistentFields;
+    !static !transient <fields>;
+    private void writeObject(java.io.ObjectOutputStream);
+    private void readObject(java.io.ObjectInputStream);
+    java.lang.Object writeReplace();
+    java.lang.Object readResolve();
+}
+
+# Preserve line number information for debugging stack traces
+-keepattributes SourceFile,LineNumberTable
+
+# Keep Gson usage intact
+-keep class com.google.gson.** { *; }
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
 # Uncomment this to preserve the line number information for
 # debugging stack traces.
 #-keepattributes SourceFile,LineNumberTable