Question

My application worked well, without any errors, so far. But lately I’ve began using ProGuard to obfuscate the code now I see the following error report in the Google Play developer console:

java.lang.RuntimeException: Unable to instantiate application MYPACKAGE.MyApp: java.lang.ClassNotFoundException: MYPACKAGE.MyApp
at android.app.LoadedApk.makeApplication(LoadedApk.java:482)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3950)
at android.app.ActivityThread.access$1300(ActivityThread.java:127)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1197)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4507)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: MYPACKAGE.MyApp
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newApplication(Instrumentation.java:945)
at android.app.LoadedApk.makeApplication(LoadedApk.java:477)

MyApp is the custom application class, obviously. There’s only one error report on that issue so far, although there are 10,000+ active installations. Does that mean I shouldn’t bother with that problem or could it be a serious issue? How can I resolve this?

Answer 1

try add this lines:

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application

to proguard.cfg file