通过线程中的处理程序更新主活动中的UI(Android)

Question

我尝试在类中建立多个连接并更新主屏幕中的多个进度条.

但我尝试在android中使用线程时出现以下错误:代码:05-06 13:13:11.092:错误/ ConnectionManager(22854):错误:无法在未调用Looper.prepare的线程内创建处理程序( )

这是我的主要Activity中的一小部分代码

public class Act_Main extends ListActivity 
{ 
 private ConnectionManager cm; 

 public void onCreate(Bundle savedInstanceState) 
 { 
      super.onCreate(savedInstanceState); 

      // Set up the window layout 
      requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
      setContentView(R.layout.main); 
      getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title); 
 } 

 public void startConnection() 
 { 
      //open DB connection 
      db = new DBAdapter(getApplicationContext()); 
      db.open(); 

      cm = new ConnectionManager(handler, db); 
      showDialog(DIALOG_PROGRESS_LOGIN); 
 } 

 @Override 
 public void onStart() 
 { 
      super.onStart(); 
      startConnection(); 
 } 

 protected Dialog onCreateDialog(int id) 
 { 
      switch (id) 
      { 
      case DIALOG_PROGRESS_LOGIN: 
           progressDialog = new ProgressDialog(Act_Main.this); 
           progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
           progressDialog.setMessage("Connecting.\nPlease wait..."); 
           progressThreadLogin = new ProgressThreadLogin(); 
           progressThreadLogin.start(); 

           return progressDialog; 
      case DIALOG_PROGRESS_NETWORK: 
           [b]progressDialog = new ProgressDialog(Act_Main.this);[/b] 
           progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
           progressDialog.setMessage("Loading entire network.\nPlease wait..."); 
           progressThreadNetwork = new ProgressThreadNetwork(); 
           progressThreadNetwork.start(); 

           return progressDialog; 
      default: 
           return null; 
      } 
 } 


 // Define the Handler that receives messages from the thread and update the progress 
 final Handler handler = new Handler() 
 { 
      public void handleMessage(Message msg) 
      { 
           int total = msg.getData().getInt("total"); 
           int step = msg.getData().getInt("step"); 

           Log.d(TAG, "handleMessage:PROCESSBAR:"+total); 
           progressDialog.setProgress(total); 

           if (total >= 100) 
           { 
                switch (step) 
                { 
                     case UPDATE_NETWORK: 
                          dismissDialog(DIALOG_PROGRESS_LOGIN); 
                          showDialog(DIALOG_PROGRESS_NETWORK); 
                          cm.getNetwork(); 
                          break; 
                                    .... 
                     default: 
                          break; 
                } 
           } 
      } 
 }; 

 private class ProgressThreadLogin extends Thread 
 { 
      ProgressThreadLogin() { } 
      public void run() { cm.login(); } 
 } 

 private class ProgressThreadNetwork extends Thread 
 { 
      ProgressThreadNetwork() { } 
      public void run() { cm.getNetwork(); } 
 } 
}

我的connectionManager类:

public class ConnectionManager 
{ 
 public ConnectionManager(Handler handler, DBAdapter db) 
 { 
      this.handler = handler; 
      this.db = db; 
 } 

 public void updateProgressBar(int step, int value) 
 { 
      if (value == 0) 
           total = total+1; 
      else 
           total = value ; 

      Message msg = handler.obtainMessage(); 
            Bundle b = new Bundle(); 
            b.putInt("total", total); 
            b.putInt("step", step); 
            msg.setData(b); 
            handler.handleMessage(msg); 
 } 

 public void login() 
 { 
            //DO MY LOGIN TASK 
      updateProgressBar(Act_Main.UPDATE_NETWORK, 100); 
 }
}

崩溃错误发生在"case DIALOG_PROGRESS_NETWORK:"的第一行.我的第一个进度条被隐藏但第二个进度条未显示.

我认为使用线程和处理程序我做错了但是我不知道为什么.

我首先使用handler.sendMessage代替handler.handleMessage但是当我在connectionManager中有多个任务时,进度条仅在所有任务结束时更新.

预先感谢您的帮助

Answer 1

进行Handler handler非决赛并在里面初始化onCreate().