如何在其中心点旋转android图标？

Question

我写了以下内容来旋转我在屏幕中心的图标,而是围绕左上角旋转(即,x的原点x = 0,y = 0).设置ImageView或RotateAnimation的某些属性应该很简单,但我无法弄明白.

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);
    }
}

Answer 1

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

Answer 2

这对我有用:

img = (ImageView)findViewById(R.id.ImageView01);
RotateAnimation rotateAnimation = new RotateAnimation(30, 90,
    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);

Answer 3

这是完整的例子

public class MainActivity extends AppCompatActivity implements MainActivityMvpModel {
    ImageView imageViewThumb;

    private static final float ROTATE_FROM = 30.0f;
    private static final float ROTATE_TO = 360.0f;
    RotateAnimation r; // = new RotateAnimation(ROTATE_FROM, ROTATE_TO);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonTest= (Button) findViewById(R.id.button_test);

        imageViewThumb= (ImageView) findViewById(R.id.icon_thumb);
        imageViewThumb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                r.setDuration((long) 2*500);
                r.setRepeatCount(0);
                imageViewThumb.startAnimation(r);

                imageViewThumb.setColorFilter(R.color.colorThumbPressed);
            }
        });
    }
}