缩进动画Scaleanimation的一个小示例

根据之前所学的所有动画，我们都可以在不同的实例中将动画效果添加进去，让界面更灵活美观，下面我就用一个简单的ListView来实现添加动画效果：

一、要实现的效果：

• 一组ListView数组，当打开页面的时候，ListView上所有的数据以渐进缩放动画效果呈现出来；

二、效果图：

三、代码附上：

package com.example.examples_scaleanimation;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.animation.LayoutAnimationController;
import android.view.animation.ScaleAnimation;
import android.widget.ArrayAdapter;

public class MainActivity extends ListActivity {

	private ArrayAdapter<String> adapter;
	private LayoutAnimationController lac;
	private ScaleAnimation sa;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,
				new String[]{"缩进ListView","缩进ListView","缩进ListView","缩进ListView",
				"缩进ListView","缩进ListView","缩进ListView","缩进ListView","缩进ListView",
				"缩进ListView","缩进ListView","缩进ListView"});
	
		setListAdapter(adapter);
		
		sa=new ScaleAnimation(0,1,0,1);
		sa.setDuration(1000);
		
		/*
		 * 参数：animation the animation to use on each child of the view group
		         delay the delay by which each child's animation must be offset
		 */
		lac=new LayoutAnimationController(sa, 0.5f);
		
		getListView().setLayoutAnimation(lac);
	}
}