android的UI中经常出现的菊花圈（圆形的加载圈）

夜深也是无聊，翻看以前的老代码，发现那个我们经常用的菊花圈，原来是帧动画做的，有点意思。突然感觉帧动画做的东西效果不错啊，至少看起来听耐看的。开工上代码：

先是布局文件：

<RelativeLayout 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:background="@drawable/login_bg" >

   <ProgressBar
       android:layout_width="24dip"
       android:layout_height="24dip"
       android:layout_alignParentBottom="true"
       android:layout_centerHorizontal="true"
       android:layout_marginBottom="100dip"
       android:indeterminate="true"
       android:indeterminateDrawable="@drawable/progress_animation" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >

    <item
        android:drawable="@drawable/pull_ref_pb_1"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_2"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_3"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_4"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_5"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_6"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_7"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_8"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_9"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_10"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_11"
        android:duration="80"/>
    <item
        android:drawable="@drawable/pull_ref_pb_12"
        android:duration="80"/>

</animation-list>

package com.woyou.frameanimation;

import java.util.Timer;
import java.util.TimerTask;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;

/**
 * 菊花圈布局
 * @author Administrator
 * 
 */
public class FrameActivity extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.login_main);
		
		Timer timer = new Timer();
		timer.schedule(new TimerTask() {
			
			@Override
			public void run() {
				Intent intent = new Intent(FrameActivity.this, LoginActivity.class);
				startActivity(intent);
				finish();
			}
		}, 5000);
	}

}