Button states with Background as AnimationDrawable in Android

Question

I have made custom buttons in Android for a while. Things were simple, just made image resources for button states and made a selector for it. Everything went smooth and nic

Answer 1

My answer is a bit late, I know, but I faced the same issue. I checked a lot of solutions, but found only one. I have tried to start the animation in onWindowFocusChanged(), start the animation in aseparate thread, but it doesn't help.

I solved this issue using setVisible (boolean visible, boolean restart)

So you can try this:

    private Button ImgBtn;
    private AnimationDrawable btnAnimation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = (Button)findViewById(R.id.button1);
        StateListDrawable background = (StateListDrawable) btn.getBackground();
        btnAnimation = (AnimationDrawable) background.getCurrent();
        btnAnimation.setVisible(true, true); // it works even in onCreate()        
    }

Hope this will help somebody :)

Answer 2

You're doing incorrect cast -- your background drawable is StateListDrawable, not AnimationDrawable. I'd rather do something like:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
  super.onWindowFocusChanged(hasFocus);
  btn = (Button)findViewById(R.id.btnAnim);
  StateListDrawable background = (StateListDrawable) btn.getBackground();
  Drawable current = background.getCurrent();
  if (current instanceof AnimationDrawable) {
      btnAnimation = (AnimationDrawable) current;
      btnAnimation.start();
  }
}