Android实战简易课程-第十七枪（LayoutAnimation布局动画）

我们对Tween和Frame动画比较熟悉，下面我们通过一个实例来了解一下LayoutAnimation(布局动画)

首先我们要建立一个动画文件zoom_in.xml:

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <scale        android:duration="1000"        android:fromXScale="0.1"        android:fromYScale="0.1"        android:pivotX="50%"        android:pivotY="50%"        android:toXScale="1.0"        android:toYScale="1.0" />    <alpha        android:duration="1000"        android:fromAlpha="0"        android:toAlpha="1.0" /></set>

main.xml:

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <scale        android:duration="1000"        android:fromXScale="0.1"        android:fromYScale="0.1"        android:pivotX="50%"        android:pivotY="50%"        android:toXScale="1.0"        android:toYScale="1.0" />    <alpha        android:duration="1000"        android:fromAlpha="0"        android:toAlpha="1.0" /></set>

MainActivity.java:

package com.example.layoutanimationdemo;import java.util.ArrayList;import java.util.List;import android.support.v7.app.ActionBarActivity;import android.support.v7.app.ActionBar;import android.support.v4.app.Fragment;import android.R.anim;import android.content.Loader.ForceLoadContentObserver;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.animation.LayoutAnimationController;import android.widget.ArrayAdapter;import android.widget.ListView;import android.os.Build;public class MainActivity extends ActionBarActivity {	private List list = new ArrayList();	private ListView listView;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		listView = (ListView) findViewById(R.id.list);		for (int i = 0; i < 20; i++) {			list.add("测试条目" + i);		}		ArrayAdapter<String> adapter = new ArrayAdapter<String>(				MainActivity.this, android.R.layout.simple_list_item_1, list);		listView.setAdapter(adapter);		LayoutAnimationController layoutAnimationController = new LayoutAnimationController(				AnimationUtils.loadAnimation(this, R.anim.zoom_in));		layoutAnimationController				.setOrder(LayoutAnimationController.ORDER_NORMAL);		listView.setLayoutAnimation(layoutAnimationController);		listView.startLayoutAnimation();	}}

运行实例：

总结：

1.LayoutAnimationController 控制器，引入动画文件；

2.setOrder(LayoutAnimationController.ORDER_NORMAL);设置显示顺序，多种显示风格可选；

3.listView.setLayoutAnimation(layoutAnimationController);//设定动画

listView.startLayoutAnimation();//启动动画