Android ImageView：我怎样才能获得当前的旋转角度？

Question

我旋转图像视图以指向所需方向的箭头。在执行下一次旋转（使用RotateAnimation）之前，如何获取ImageView的当前旋转角度？

谢谢

Answer 1

您需要将您以前的旋转角度存储在某个变量中。

Answer 2

保存旋转角度：

ImageView arrow = (ImageView) findViewById(R.id.arrow); 
    float x = arrow.getPivotX(); 
    float y = arrow.getPivotY(); 
    RotateAnimation anim = new RotateAnimation(arrowRotateStartAngle, arrowRotateXAngle, arrow.getWidth()/2, arrow.getHeight()/2); 
    anim.setFillAfter(true); 
    anim.setDuration(1000); 
    arrow.startAnimation(anim); 

    temRotate = arrowRotateStartAngle; 
    arrowRotateStartAngle = arrowRotateXAngle; 
    arrowRotateXAngle = temRotate;