在android中资源文件夹中添加一个新的图片资源

package com.ccf.birdframe;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.Menu;
import android.view.View;
import android.widget.FrameLayout;

public class BirdActivity extends Activity {
	FrameLayout frame = null;
	private boolean  flag = true;
	//由该类两个方法间的循环调用，实现界面不断更新
	class MyHandler extends Handler{
		int i = 0;
		public void handleMessage(Message msg) {
			i++;
			//总共7幅图，依次显示
			show(i % 7);
			//调用sleep函数
			sleep(50);
		}
		public void sleep(long delayMillis) {
			//判断是否继续飞翔
			if(flag) {
				//实质上是调用了一次handleMessage
				sendMessageDelayed(obtainMessage(0), delayMillis);
			}
		}	
	}
	
	//该方法是被调用以更新帧布局的前景图片
	void show(int j) {
		//获取七张图片
		Drawable mybird1 = getResources().getDrawable(R.drawable.mybird1);
		Drawable mybird2 = getResources().getDrawable(R.drawable.mybird2);
		Drawable mybird3 = getResources().getDrawable(R.drawable.mybird3);
		Drawable mybird4 = getResources().getDrawable(R.drawable.mybird4);
		Drawable mybird5 = getResources().getDrawable(R.drawable.mybird5);
		Drawable mybird6 = getResources().getDrawable(R.drawable.mybird6);
		Drawable mybird7 = getResources().getDrawable(R.drawable.mybird7);
		//不同的情况，设置不同的前景
		switch(j) {
		     case 0:
		    	  frame.setForeground(mybird1);
		    	  break;
		     case 1:
		    	 frame.setForeground(mybird2);
		    	 break;
		     case 2:
		    	 frame.setForeground(mybird3);
		    	 break;
		     case 3:
		    	 frame.setForeground(mybird4);
		    	 break;
		     case 4:
		    	 frame.setForeground(mybird5);
		    	 break;
		     case 5:
		    	 frame.setForeground(mybird6);
		    	 break;
		     case 6:
		    	 frame.setForeground(mybird7);
		    	 break;
		}
	}
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_bird);
		frame = (FrameLayout)findViewById(R.id.frame);
		//创建一个Handler子类对象，要调用其方法
		final MyHandler myHandler = new MyHandler();
		myHandler.sleep(50);
		//为frame设置单击事件，当其被击中时，在飞翔于暂停之间切换
		frame.setOnClickListener(new View.OnClickListener()  {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
					flag = !flag;
					myHandler.sleep(50);
			}
		});
	}
}