package com.example.test;import java.util.Timer;import java.util.TimerTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {    private int currentColor = 0;    //定义一个颜色数组    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]);        }        final Handler handler = new Handler()        {            @Override            public void handleMessage(Message msg)            {                //表明消息来自本程序所发送                if(msg.what == 0x1122)                {                    //依次改变7个TextView的背景色                    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]);                    }                }                super.handleMessage(msg);            }        };        //定义一个线程周期性的改变currentColor变量值        new Timer().schedule(new TimerTask()        {            @Override            public void run()            {                currentColor++;                if(currentColor >= 6)                {                    currentColor = 0;                }                //发送一条消息通知系统改变7个TextView组件的背景色                Message m = new Message();                //给该消息定义一个标识                m.what = 0x1122;                handler.sendMessage(m);                }                }, 0 , 100);     }    @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;    }}