如何在旋转中心点的机器人图标？ [英] How to spin an android icon on its center point?

问题描述

我写了下面的旋转屏幕的中心，我的图标，而是绕左上角（即原点X = 0，Y = 0的ImageView的）。它应该是简单设置的ImageView或RotateAnimation的某些属性，但我不明白。

 公共类IconPromoActivity延伸活动{
    私有静态最终浮动ROTATE_FROM = 0.0;
    私有静态最终浮动ROTATE_TO = -10.0f * 360.0f; // 3.141592654f * 32.0f;

 / **第一次创建活动时调用。 * /
    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;

        ImageView的图标=（ImageView的）findViewById（R.id.favicon）;

  RotateAnimationř; // =新RotateAnimation（ROTATE_FROM，ROTATE_TO）;
  R =新RotateAnimation（ROTATE_FROM，ROTATE_TO，0，0，40，0）;
  r.setDuration（（长）2 * 1500）;
  r.setRepeatCount（0）;
  favicon.startAnimation（r）的;
    }
}
 

解决方案

试试： R =新RotateAnimation（ROTATE_FROM，ROTATE_TO，Animation.RELATIVE_TO_SELF，0.5F，Animation.RELATIVE_TO_SELF，0.5F）;

I have written the following to spin my icon on the center of the screen and instead it rotates around the upper-left corner (i.e., origin x=0, y=0 of the ImageView). It should be simple to set some attributes of the ImageView or the RotateAnimation, but I can't figure it out.

public class IconPromoActivity extends Activity {
    private static final float ROTATE_FROM = 0.0f;
    private static final float ROTATE_TO = -10.0f * 360.0f;// 3.141592654f * 32.0f;

 /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ImageView favicon = (ImageView) findViewById(R.id.favicon);

  RotateAnimation r; // = new RotateAnimation(ROTATE_FROM, ROTATE_TO);
  r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, 0, 0, 40, 0);
  r.setDuration((long) 2*1500);
  r.setRepeatCount(0);
  favicon.startAnimation(r);
    }
}

解决方案

Try: r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);

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