如何做一个匀速旋转的轮子

首先写一个animation.xml的动画文件

<?xml version= "1.0" encoding ="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <rotate
    android:fromDegrees= "0"   android:toDegrees ="360"   android:pivotX="50%"
    android:pivotY= "50%"  android:duration ="4000"
   
    android:repeatCount= "infinite">
   
  </rotate >
    </set >

然后在activity中onCreate方法里面写入

ImageView wheela=(ImageView)findViewById(R.id. imageView2);
              ImageView wheelb=(ImageView)findViewById(R.id. imageView3);
              Animation animation1=AnimationUtils.loadAnimation(this,R.anim.rotate);
              LinearInterpolator lir = new LinearInterpolator();/*这两句保证匀速旋转,否则是先快后慢*/
               animation1.setInterpolator(lir);
              wheela.startAnimation( animation1);
              wheelb.startAnimation( animation1);