按下和释放时如何更改ImageButton的图像？

<ImageButton
    android:id="@+id/imageButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/initial_image" />

ImageButton imageButton = findViewById(R.id.imageButton);
imageButton.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            // 当按下时更改图像
            imageButton.setImageResource(R.drawable.pressed_image);
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            // 当释放时恢复初始图像
            imageButton.setImageResource(R.drawable.initial_image);
        }
        return false;
    }
});