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      1. 以编程方式旋转可绘制对象或视图

        Programmatically rotate drawable or view(以编程方式旋转可绘制对象或视图)

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                  本文介绍了以编程方式旋转可绘制对象或视图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  <rotate xmlns:android="http://schemas.android.com/apk/res/android"
                  android:drawable="@drawable/your_drawable"
                  android:fromDegrees="0"
                  android:pivotX="50%"
                  android:pivotY="50%"
                  android:toDegrees="360" />
                  

                  我想以编程方式旋转可绘制对象.

                  I want programmatically rotate the drawable.

                  我该怎么做?

                  这是我的回调

                  private class RotateListener implements RotateGestureDetector.OnRotateGestureListener{
                      @Override
                      public boolean onRotate(MotionEvent event1, MotionEvent event2,
                              double deltaAngle) {
                  
                          return true;
                      }
                  }
                  

                  deltaangle不超过0.1,我不确定提取值是多少.

                  The deltaangle not more than 0.1, I not sure what is the extract value.

                  推荐答案

                  以下代码围绕 ImageView 的中心旋转:

                  The following code rotates an ImageView around its center:

                  ImageView myImageView = (ImageView)findViewById(R.id.my_imageview);
                  
                  AnimationSet animSet = new AnimationSet(true);
                  animSet.setInterpolator(new DecelerateInterpolator());
                  animSet.setFillAfter(true);
                  animSet.setFillEnabled(true);
                  
                  final RotateAnimation animRotate = new RotateAnimation(0.0f, -90.0f,
                      RotateAnimation.RELATIVE_TO_SELF, 0.5f, 
                      RotateAnimation.RELATIVE_TO_SELF, 0.5f);
                  
                  animRotate.setDuration(1500);
                  animRotate.setFillAfter(true);
                  animSet.addAnimation(animRotate);
                  
                  myImageView.startAnimation(animSet);
                  

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