关于前端:android开发之Handler

Handler 实例

 子类须要继承 Hendler 类，并重写 handleMessage(Message msg) 办法, 用于承受线程数据，次要看具体实例，重要的局部都已给了正文：

public class MainActivity extends Activity {

/** Called when the activity is first created. */  
private WebView wv =null;  
private Handler h = new Handler();  
public final String TAG = "UNISDP";  
public final String MY_LOG = "my_log";   
MyHandler myHandler;   
   
public void onCreate(Bundle savedInstanceState)   
{super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    wv = (WebView) findViewById(R.id.web);  
    WebSettings webSettings = wv.getSettings();  

    webSettings.setJavaScriptEnabled(true);  
    webSettings.setSaveFormData(false);  
    webSettings.setSavePassword(false);  
    webSettings.setSupportZoom(false);  
    wv.addJavascriptInterface(new runJavaScript(), "myjs");  
    wv.loadUrl(sdFilePath);  
      
    myHandler = new MyHandler(); // 当创立一个新的 Handler 实例时, 它会绑定到以后线程的音讯队列中, 开始散发数据  
      
    MyThread m = new MyThread();  
    Thread getDataFromServer_thread = new Thread(m);  
    getDataFromServer_thread.start();}  

取数据线程 从页游服务器获取数据

class MyThread implements Runnable   
{public void run()   
    {     
        Message msg ;  
        Bundle b ;                                
        while(true)  
        {  
            try   
            {Thread.sleep(1000);  
                msg = new Message();  
                b = new Bundle();// 存放数据  
                b.putString("value", "发送给 UI 线程的数据...");  
                msg.setData(b);  
                MainActivity.thiswww.sangpi.commyHandler.sendMessage(msg); // 向 Handler 发送音讯, 更新 UI  
            }   
            catch (InterruptedException e)   
            {e.printStackTrace();  
            }                     
               
        }  
    }   
}    
// 承受音讯, 解决音讯 , 此 Handler 会与以后主线程一块运行   
class MyHandler extends Handler  
{public MyHandler()   
    { }   
    public MyHandler(Looper L)  
    {super(L);  
    }   
    // 子类必须重写此办法, 承受数据   
    @Override   
    public void handleMessage(Message msg)   
    {super.handleMessage(msg);          
        // 此处能够更新 UI   
        Bundle b = msg.getData();   
        String strValue = b.getString("value");   
        //MainActivity.this.button.append(color);   
        Log.i(MY_LOG,strValue);  
    }   
}     

}