android handler 实现三步曲

一. 要实现接口：

public class VrowsePicActivity extends Activity implements Handler.Callback{}

 

二.定义Handler：

 private Handler messageHandler;

 

三.初始化Handler：

messageHandler = new Handler( this);

 四.线程发出消息：

 public void uploadPictrue(){
    	  new Thread() {   
              @Override  
              public void run() {   
             	 try {
		if(uploadFile(value).equals("1")){
							Message message = messageHandler.obtainMessage(UPLOAD_SUCCESS, "上传成功"); 
							messageHandler.sendMessage(message);  
						}else{
							Message message = messageHandler.obtainMessage(UPLOAD_ERROR, "上传失败"); 
							messageHandler.sendMessage(message);  
						}
					} catch (Exception e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}   
             	  
              }   
          }.start();   
    	
    }

  五.handler 接受消息

public boolean handleMessage(Message message) {
		// TODO Auto-generated method stub
		try {
			switch (message.what) {
			case UPLOAD_SUCCESS:
				Toast.makeText(VrowsePicActivity.this,(String) message.obj.toString(), Toast.LENGTH_SHORT).show();
			case UPLOAD_ERROR:
				Toast.makeText(VrowsePicActivity.this,(String) message.obj.toString(), Toast.LENGTH_SHORT).show();
			default:
				break;
			}

		} catch (Exception e) {
			Log.i("db", "VrowsePicActivity=handler error");
			e.printStackTrace();
		}
		return false;
	}

 

评论

1 楼 shero_ys 2012-03-13  

public class VrowsePicActivity extends Activity implements Handler.Callback{} 

我试着继承Handler.Callback，发现根本就不能够