Answer 1

您可以尝试类似

的内容

mMediaController = new MediaController(this) {

        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            // TODO Auto-generated method stub

            if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
                finish();

            }
            return super.dispatchKeyEvent(event);
        }
} 

或dispatchKeyEvent，如

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    ContentActivity.this.dispatchKeyEvent(event);
}