<?xml version="1.0" encoding="utf-8"?><LinearLayout android:orientation="vertical"    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:animateLayoutChanges="true"    android:id="@+id/myLinearLayout"    >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button2" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button3" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button4" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button5" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button6" /></LinearLayout>

public class MainActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 找到我们设置的布局        LinearLayout rootView = (LinearLayout)this.findViewById(R.id.myLinearLayout);        ScaleAnimation as = new ScaleAnimation(0, 1, 0, 1);  // 缩放动画        as.setDuration(5000); //动画时间5s        // 布局动画控制器        LayoutAnimationController lac = new LayoutAnimationController(as, 0.5f);        lac.setOrder(LayoutAnimationController.ORDER_REVERSE); // 动画类型  从下往上  默认是从上往下        /**         LayoutAnimationController.ORDER_NORMAL;  //顺序显示         LayoutAnimationController.ORDER_REVERSE; //反显示         LayoutAnimationController.ORDER_RANDOM   //随机显示         * */        rootView.setLayoutAnimation(lac);        System.out.println("onCreate");    }}