如何在填充(或触摸) EditText后才显示我的DrawableRight图像？

public class CustomEditText extends EditText implements View.OnTouchListener {
    private Drawable drawableRight;
    
    public CustomEditText(Context context) {
        super(context);
        init();
    }
    
    public CustomEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    
    public CustomEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    
    private void init() {
        // 获取DrawableRight图像
        drawableRight = getCompoundDrawables()[2];
        
        // 设置触摸监听器
        setOnTouchListener(this);
    }
    
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            // 判断触摸位置是否在DrawableRight图像内
            if (event.getRawX() >= (getRight() - drawableRight.getBounds().width())) {
                // 显示DrawableRight图像
                // 可以在这里执行一些操作，比如清空EditText内容
                setCompoundDrawables(null, null, drawableRight, null);
                return true;
            }
        }
        return false;
    }
}

<com.example.CustomEditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:drawableRight="@drawable/your_drawable"
    android:hint="Enter text" />