Since today, something weird is happening with my application. Every time I click a button that has set the android:onClick attribute, I get an IllegalStateException: Co
You need to tell proguard not to mutate the method associated with your android:onClick tag.
android:onClick
Here is an example rule (taken from the proguard website):
-keep class mypackage.MyCallbackClass { void myCallbackMethod(java.lang.String); }