How can I tell ProGuard to keep my function that is used for onClick?

Question

I am using the android:onClick atribute in some of my .xml layout files for my android application, but ProGuard is removing these methods from my code when it runs

Answer 1

According to proguard documentation:

Fields and methods may also be specified using regular expressions. Names can contain the following wildcards: ? matches any single character in a method name. * matches any part of a method name.

so, you will be find specifying

-keep class com.example.MyClass {
  public void listener_*(android.view.View);
}

in your proguard flags.

Answer 2

You can do it once for all your classes in this way:

-keepclasseswithmembers class * {
    void listener_*(...);
}

Answer 3

An a bit more greedy approach that should keep all "onClick" methods:

-keepclassmembers class * {
    public void * (android.view.View);
}

==> so basically every public method that has an Android View as the only Paramater should survive ProGuard then.