Animation动画效果四

如何使用layoutAnimation
首先: 需要创建一个layoutAnimation的配置文件, 定义动画的步骤和引用动画
然后: 在需要动画效果的控件中加入android:layoutAnimation="@anim/list_anim_layout".

一个完成的例子:

首先/res/anim/alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator">
    <alpha android:fromAlpha="0" android:toAlpha="1" android:duration="2000"/>
</set>

新建一个/res/anim/list_anim_layout.xml

<?xml version="1.0" encoding="utf-8"?><!-- animationOrder: random, normal -->
<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android" android:delay="2" android:animationOrder="normal" android:animation="@anim/alpha"></layoutAnimation>

这个/res/layout/activity.xml是ListView用的

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal"
  android:layout_width="match_parent"
  android:layout_height="50px">
    <TextView android:id="@+id/view1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:layout_gravity="center_vertical"/>  
	<TextView android:id="@+id/view2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical"/>
</LinearLayout>

/res/layout/main.xml主文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView  
	    android:layout_width="fill_parent" 
	    android:layout_height="wrap_content" 
	    android:text="@string/hello"
	    />
	<ListView android:id="@+id/listView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:layoutAnimation="@anim/list_anim_layout"></ListView>
	<Button android:text="Button" android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="setAlphaClick"></Button>
</LinearLayout>

Animation3Activity.java文件

package com.cn;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class Animation3Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
    }
    private void createListView(){
    	List<Map<String,String>> list = new ArrayList<Map<String,String>>();  
    	Map<String,String> map = new HashMap<String,String>();  
    	map.put("姓名", "小王");  
    	map.put("年龄", "12");  
    	list.add(map);
    	map = new HashMap<String,String>();  
    	map.put("姓名", "小王");  
    	map.put("年龄", "12");  
    	list.add(map);
    	map = new HashMap<String,String>();  
    	map.put("姓名", "小王");  
    	map.put("年龄", "12");  
    	list.add(map);
    	ListView view = (ListView)findViewById(R.id.listView1);  
    	view.setAdapter(new SimpleAdapter(this, list, R.layout.activity, new String[]{"姓名","年龄"}, new int[]{R.id.view1,R.id.view2}));  
//    	setContentView(view);
    }
    
    public void setAlphaClick(View v){
    	createListView();
    }
}