动画-- 按钮按序列（从小到大）显示

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LayoutAnimationController;
import android.view.animation.ScaleAnimation;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            
            final LinearLayout rootView = (LinearLayout) inflater.inflate(
                    R.layout.fragment_main, container, false);

            /**
             *  ***  ScaleAnimation 缩放动画效果  ***  
             * float fromX 动画起始时 X坐标上的伸缩尺寸。
             * float toX 动画结束时 X坐标上的伸缩尺寸。
             * float fromY 动画起始时Y坐标上的伸缩尺寸。 
             * float toY 动画结束时Y坐标上的伸缩尺寸。 
             */
            ScaleAnimation sa = new ScaleAnimation(0, 1, 0, 1);
            sa.setDuration(5000); // 5秒 设置持续时间

            /**
             * LayoutAnimationController 控制一组控件按照规定显示.
             * delay 推迟。
             */
            LayoutAnimationController lac = new LayoutAnimationController(sa,
                    0.5f);
              
            /**
             * LayoutAnimationController.ORDER_NORMAL    顺序显示
             * LayoutAnimationController.ORDER_REVERSE   反显示(从下往上)
             * LayoutAnimationController.ORDER_RANDOM    随机显示
             */
            lac.setOrder(LayoutAnimationController.ORDER_REVERSE);

            rootView.setLayoutAnimation(lac);

            return rootView;
        }
    }

}

activity_main.xml

<FrameLayout   xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

fragment_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.jikexueyuan.layoutanimationinlinearlayout.MainActivity$PlaceholderFragment" >

    <Button
        android:id="@+id/Button05"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/Button04"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/Button03"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/Button02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/Button01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>