Question

使用this mechanism我能够在ImageView中成功旋转图像。效果很好。

但是，如果ImageView具有背景图像，则该drawable也不会旋转。我怎样才能旋转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);
    }
}

旋转Android ImageView及其背景

2 个答案: