Android布局管理器（贞布局）

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+id/View01"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="210dp"  
        android:height="50dp"  
        android:background="#ff0000"  
        />  
    <TextView android:id="@+id/View02"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="180dp"  
        android:height="50dp"  
        android:background="#dd0000"     
        />  
    <TextView android:id="@+id/View03"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="150dp"  
        android:height="50dp"  
        android:background="#bb0000"     
        />  
    <TextView android:id="@+id/View04"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="120dp"  
        android:height="50dp"  
        android:background="#990000"     
        />  
    <TextView android:id="@+id/View05"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="90dp"  
        android:height="50dp"  
        android:background="#770000"     
        />  
    <TextView android:id="@+id/View06"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="60dp"  
        android:height="50dp"  
        android:background="#550000"     
        />  
    <TextView android:id="@+id/View07"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:width="30dp"  
        android:height="50dp"  
        android:background="#330000"     
        />       
</FrameLayout>

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

    private int currentColor = 0;
    
    final int[] colors = new int[]{
        R.color.color7,    
        R.color.color6,
        R.color.color5,
        R.color.color4,
        R.color.color3,
        R.color.color2,
        R.color.color1,
    };
    final int[] names = new int[]{
            R.id.View01,
            R.id.View02,
            R.id.View03,
            R.id.View04,
            R.id.View05,
            R.id.View06,
            R.id.View07,
    };
    
    TextView[] views = new TextView[7];
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        for(int i = 0 ; i<7 ;i++){
            views[i] = (TextView) findViewById(names[i]);
        }
        //使用Handler进行获得系统消息，进行更新UI
        final Handler handler = new Handler(){
              public void handleMessage(Message msg) {   
                  if(msg.what == 0x1122){
                     for(int i=0 ;i <7-currentColor ;i++){
                         views[i].setBackgroundResource(colors[i+currentColor]);
                     }
                     for(int i=7-currentColor,j=0 ; i<7 ;i++,j++){
                         views[i].setBackgroundResource(colors[j]);
                     }
                  }
              }   
         }; 
         //定义一个线程周期
         new Timer().schedule(new TimerTask() {
            
            @Override
            public void run() {
                // TODO Auto-generated method stub
                currentColor++;
                if(currentColor>=6){
                    currentColor=0;
                }
                //发送一条消息通知系统
                Message m = new Message();
                //给该信息定义一个唯一标识
                m.what = 0x1122;
                handler.sendMessage(m);
            }
        }, 0,1000);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}