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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 nice. Now I encountered a new situation. I have made a animation drawable and set it as a background for my button. <animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false"> <item android:drawable="@drawable/frame1" android:duration="600" /> <item android:drawable="@drawable/frame2" android:duration="300" /> <item android:drawable="@drawable/frame3" android:duration="500" /> </animation-list> If I set the animation as button's Background it works fine. If I try to make a simple selector <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="false" android:drawable="@drawable/animation" /> <item android:state_pressed="true" android:drawable="@drawable/pressed" /> </selector> where normal state of the button would have animation as background and the pressed state a static image, things don't work right. On my main activity, on onWindowFocus I get the button background and start the animation @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); btn = (Button)findViewById(R.id.btnAnim); btnAnimation = (AnimationDrawable) btnAnim.getBackground(); btnAnimation.start(); } Here appears to be the problem, because my animation won't be taken correctly from the selector and I get the following error: 03-14 15:21:16.146: ERROR/AndroidRuntime(440): FATAL EXCEPTION: main 03-14 15:21:16.146: ERROR/AndroidRuntime(440): java.lang.ClassCastException: android.graphics

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