android实例2：FrameLayout布局之霓虹灯

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layout xml

<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:layout_gravity="center"
        android:width="320px"
        android:height="320px"
        android:background="#f00" />
    
     <TextView
        android:id="@+id/view02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="280px"
        android:height="280px"
        android:background="#0f0" />
     
      <TextView
        android:id="@+id/view03"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="320px"
        android:height="320px"
        android:background="#00f" />
      
       <TextView
        android:id="@+id/view04"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="240px"
        android:height="240px"
        android:background="#ff0" />
       
        <TextView
        android:id="@+id/view05"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="200px"
        android:height="200px"
        android:background="#f0f" />
        
         <TextView
        android:id="@+id/view06"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="160px"
        android:height="160px"
        android:background="#0ff" />

</FrameLayout>

这里我们 还需要额外的一个保存颜色的 colors.xml，它是放在res/values下

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="color1">#f00</color>
    <color name="color2">#0f0</color>
    <color name="color3">#00f</color>
    <color name="color4">#ff0</color>
    <color name="color5">#f0f</color>
    <color name="color6">#0ff</color>
</resources>

最后是mainActivity.java

package com.example.androidtest1;

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.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

    private String  TAG = "androidtest1";
    private int currentcolor = 0;
    final int[] colors = new int[]{
            R.color.color1,
            R.color.color2,
            R.color.color3,
            R.color.color4,
            R.color.color5,
            R.color.color6
    };
    
    final int[] names = new int[]{
        R.id.view01,    
        R.id.view02,    
        R.id.view03,    
        R.id.view04,    
        R.id.view05,    
        R.id.view06
    };
    
    TextView[] views = new TextView[names.length];
    
    Handler handler = new Handler()
    {
        @Override
        public void handleMessage(Message msg)
        {
            if(msg.what == 0x123)
            {
                for(int i=0;i<names.length;i++)
                {
                    views[i].setBackgroundResource(colors[(i+currentcolor) % names.length]); //i+后 每次颜色往后循环一个
                }
                currentcolor++;
            }
            super.handleMessage(msg);
        }
    };
    
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        for(int i=0;i<names.length;i++)
        {
            views[i] = (TextView)findViewById(names[i]);
        }
        new Timer().schedule(new TimerTask()
        {
            @Override
            public void run()
            {
                handler.sendEmptyMessage(0x123);
            }
        },0,500);
    }
    


}