android - 旋转 Android ImageView 及其背景

Question

使用这种机制，我能够成功地在 ImageView 中旋转图像。效果很好。

但是，如果 ImageView 有背景图像，则该可绘制对象也不会旋转。如何还可以旋转 ImageView 的背景图像？

Answer 1

覆盖 draw() 而不是 onDraw() 来旋转背景。

@Override
public void draw(Canvas canvas) {
    canvas.save();
    canvas.rotate(45,xRotation,yRotation);
    super.draw(canvas);
    canvas.restore();
}

Answer 2

public class MainActivity extends Activity
{
    private ImageView mImageView = null;
    private Animation mRotateAnimation = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mImageView = (ImageView) findViewById(R.id.my_image);
        mRotateAnimation = AnimationUtils.loadAnimation(this, R.anim.my_rotate_90);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            mImageView.startAnimation(mRotateAnimation);
            return true;
        }
        return super.onTouchEvent(event);
    }
}