Animation使用方法(二)-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_9512/article/details/82242624

本文介绍了一种使用Android动画实现列表项渐显效果的方法。通过自定义动画控制器，实现了列表视图中每一项以淡入的形式出现。该教程适用于Android开发者学习动画效果的应用。

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效果图同：Animation使用方法(一)的效果图
工程结构图：
[img]
[img]http://dl.iteye.com/upload/attachment/617390/6bce39dc-fea9-3c9f-ab1c-d87cd2ac3b85.png[/img]
[/img]

可以看到，比Animation使用方法(一)的工程结构少了一个：list_controller.xml
布局文件的
main.xml

<?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"
    >
	<ListView 
		android:layout_height="wrap_content"
		android:layout_width="fill_parent"
		android:id="@id/android:list"
	/>
</LinearLayout>

user.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:padding="10dp"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ImageView 
			android:id="@+id/image"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
	/>
    <TextView 
    	android:id="@+id/name"
    	android:layout_width="180dp"
    	android:layout_height="30dp"
    	android:layout_marginLeft="20dp"
    	android:textColor="#fff"
    	android:textSize="10pt"
		android:singleLine="true"
    />
	<TextView 
		android:id="@+id/age"
		android:layout_width="fill_parent"
    	android:layout_height="fill_parent"
    	android:layout_marginRight="10dp"
    	android:textColor="#fff"
    	android:gravity="right"
    	android:textSize="10pt"
	/>
</LinearLayout>

/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_interpolator"
>
<alpha
	android:fromAlpha="0.0"
	android:toAlpha="1.0"
	android:duration="2000"
></alpha>
</set>

AnimationDemo4Activity

package cxt.demo;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import android.view.animation.Animation.AnimationListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class AnimationDemo4Activity extends ListActivity {
	private ArrayList<HashMap<String,Object>> list = null;
	private ListView listView = null; 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listView = getListView();
        list = new ArrayList<HashMap<String,Object>>();
        HashMap<String,Object> m1 = new HashMap<String, Object>();
        HashMap<String,Object> m2 = new HashMap<String, Object>();
        HashMap<String,Object> m3 = new HashMap<String, Object>();
        m1.put("image", R.drawable.z11);
        m1.put("name", "Jack");
        m1.put("age","63");
        m2.put("image", R.drawable.z22);
        m2.put("name", "Bob");
        m2.put("age","15");
        m3.put("image", R.drawable.z33);
        m3.put("name", "Theron");
        m3.put("age","25");
        list.add(m1);
        list.add(m2);
        list.add(m3);
        SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.user, new String[]{"image","name","age"}, new int[]{R.id.image,R.id.name,R.id.age});
        setListAdapter(adapter);

        Animation animation = AnimationUtils.loadAnimation(AnimationDemo4Activity.this, R.anim.alpha);
        LayoutAnimationController controller = new LayoutAnimationController(animation);
        controller.setOrder(LayoutAnimationController.ORDER_NORMAL);
        listView.setLayoutAnimation(controller);
    }

    private class AnimationImpl implements AnimationListener{

		@Override
		public void onAnimationEnd(Animation arg0) {
			// TODO Auto-generated method stub

		}

		@Override
		public void onAnimationRepeat(Animation arg0) {
			// TODO Auto-generated method stub

		}

		@Override
		public void onAnimationStart(Animation arg0) {
			// TODO Auto-generated method stub

		}

    }

}