RelativeLayout ly=(RelativeLayout)findViewById(R.id.layout);

 ScaleAnimation sa = new ScaleAnimation(0, 1,0,1);  //设置动画效果

 sa.setDuration(3000);

 LayoutAnimationController lac = new LayoutAnimationController(sa, 0.5f);   //布局动画管理器

 lac.setOrder(LayoutAnimationController.ORDER_RANDOM);  //设置动画顺序

 ly.setLayoutAnimation(lac);

 public class MainActivity extends Activity {

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         RelativeLayout ly=(RelativeLayout)findViewById(R.id.layout);   //找到布局文件的id

         ScaleAnimation sa = new ScaleAnimation(0, 1,0,1);  //设置动画效果

         sa.setDuration(3000);

         LayoutAnimationController lac = new LayoutAnimationController(sa, 0.5f);   //布局动画管理器

         lac.setOrder(LayoutAnimationController.ORDER_RANDOM);  //设置动画顺序

         ly.setLayoutAnimation(lac);

     }

 }