如何在其中心点旋转 android 图标？
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How to spin an android icon on its center point?
提问by mobibob
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.
我编写了以下内容来在屏幕中央旋转我的图标，而是围绕左上角旋转（即 ImageView 的原点 x=0，y=0）。设置ImageView或者RotateAnimation的一些属性应该很简单，但是我想不通。
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);
}
}
回答by Rich Schuler
Try:
r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
尝试：
r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
回答by Rodrigo Ferreira
This works for me:
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);
回答by Omar
Here is the full example
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);
}
});
}
}
