Android的Handle学习

final Handler myHandler = new Handler ()
{
                   @Override
                   public void handleMessage(Message msg)
                   {
                         if (msg.what == 0x1222)
                         {
                            
                         }
                   }
 };

new Timer().schedule(
          new TimerTask(){ //TimerTask类型的对象，TimerTask的run()方法是要周期执行的一个任务
                  @Override
                  public void run()  {
                        currentColor ++;
                        if (currentColor >= 6)
                                currentColor = 0;                      
                        Message m = new Message();
                        m. what = 0x1122;
                        handler.sendMessage(m); 
                  }           
      },
      0 , //表示多长时间后开始执行
     100//执行的周期
); 

public class FrameLayoutTest 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
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.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)
			{
				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]);
					}
				}
			}
		};
		new Timer().schedule(new TimerTask()
		{
			@Override
			public void run()
			{
				currentColor++;
				if(currentColor >= 6)
				{
					currentColor = 0;
				}
				Message m = new Message();
				m.what = 0x1122;
				handler.sendMessage(m);	
			}		
		}, 0 , 100); 
	}
}

public class HandlerTest extends Activity
{
	int[] imageIds = new int[]
	{ 
		R.drawable.haed_danya,
		R.drawable.haed_fanse,
		R.drawable.haed_fugu,
		R.drawable.haed_gudian,
		R.drawable.haed_houqingchu		
	};
	int currentImageId = 0;
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		final ImageView show = (ImageView)findViewById(R.id.show);		
		final Handler myHandler = new Handler()
		{
			@Override
			public void handleMessage(Message msg)
			{
				if (msg.what == 0x1222)
				{
					show.setImageResource(imageIds[currentImageId++]);
					if (currentImageId >= 4)
					{
						currentImageId = 0; 
					}
				}
			}
		};

		new Timer().schedule(new TimerTask()
		{
			@Override
			public void run()
			{
				Message msg = new Message();
				msg.what = 0x1222;
				myHandler.sendMessage(msg);
			}
		}, 0 , 100);
	}
}