我的計時器正在執行的方法保持失敗

Question

我正在使用Timer類每2分鐘執行一次函數。

我的TimerMethod中的代碼失敗，但是當它是onCreat的一部分時，它的工作完美。我注意到它在更新我的佈局中的文本字段時失敗。

代碼如下：

public class MeetingManager extends ListActivity { 

    private static final String TAG = "MyApp"; 
    public static final String PREFS_NAME = "MyAppData"; 
    private Timer myTimer; 

    /** Called when the activity is first created. */ 

    //private PendingIntent mAlarmSender; 

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

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
     WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.main); 

      myTimer = new Timer(); 
      myTimer.schedule(new TimerTask() { 
       @Override 
       public void run() { 
        TimerMethod(); 
       } 

        }, 0, 10000); 


    } 

在同一類我TimerMethod：

protected void TimerMethod() { 
      Log.d(TAG, "NEW IN TIMER"); 
      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
      String items = settings.getString("RoomId", "MISSING"); 


      Map<String, String> maproom = new HashMap<String, String>(); 
      maproom.put("145", "dddd"); 
      maproom.put("110", "vvvv"); 
      maproom.put("148", "ddddd"); 
      maproom.put("45", "Pfgdfgdfgdf"); 


      String roomName = maproom.get(items); 

      Log.d(TAG, roomName); 

      TextView currentRoomName = (TextView) this.findViewById(R.id.RoomTitle); 
      currentRoomName.setText(roomName); 

      ImageView b=(ImageView)findViewById(R.id.b); 
       b.setOnClickListener(listener); 


       Date anotherCurDate = new Date(); 

       SimpleDateFormat formatter = new SimpleDateFormat("EEEE', 'MMMM dd', ' yyyy"); 
       String formattedDateString = formatter.format(anotherCurDate); 

      TextView currentRoomDate = (TextView) this.findViewById(R.id.CurrentDate); 
      currentRoomDate.setText(formattedDateString); 

    ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>(); 


      String xml = XMLfunctions.getXML(items); 
      Document doc = XMLfunctions.XMLfromString(xml); 

      /*int numResults = XMLfunctions.numResults(doc); 

      if((numResults <= 0)){ 
       Toast.makeText(MeetingManager.this, "NOT GETTING XML", Toast.LENGTH_LONG).show(); 
       finish(); 
      } */ 

      Element docElem = doc.getDocumentElement(); 
      NodeList nodes = (NodeList)docElem.getElementsByTagName("meeting_item"); 

    int node_number = nodes.getLength(); 
    String node_final = String.valueOf(node_number); 

      Log.d(TAG, node_final); 

      for (int i = 0; i < nodes.getLength(); i++) {       
       HashMap<String, String> map = new HashMap<String, String>();  

       Element e = (Element)nodes.item(i); 

         map.put("time", XMLfunctions.getValue(e, "time")); 
         map.put("endtime", XMLfunctions.getValue(e, "endtime")); 
         map.put("name", XMLfunctions.getValue(e, "meeting_name")); 
         map.put("hostname", XMLfunctions.getValue(e, "host_name")); 
         mylist.add(map); 



      }  

      ListAdapter adapter = new SimpleAdapter(MeetingManager.this, mylist , R.layout.listlayout, 
          new String[] {"time","endtime", "name", "hostname" }, 
          new int[] { R.id.time, R.id.endtime, R.id.meeting_name, R.id.host }); 

      setListAdapter(adapter); 

    } 

我沒有得到一個錯誤，每次在我logcat的，但我沒有看到這個來通過一個我的測試。

12-14 09:39:29.584: ERROR/AndroidRuntime(572): FATAL EXCEPTION: Timer-0 
12-14 09:39:29.584: ERROR/AndroidRuntime(572): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.ViewRoot.checkThread(ViewRoot.java:2802) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.ViewRoot.requestLayout(ViewRoot.java:594) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.View.requestLayout(View.java:8125) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.View.requestLayout(View.java:8125) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.View.requestLayout(View.java:8125) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.view.View.requestLayout(View.java:8125) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.widget.TextView.checkForRelayout(TextView.java:5378) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.widget.TextView.setText(TextView.java:2688) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.widget.TextView.setText(TextView.java:2556) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at android.widget.TextView.setText(TextView.java:2531) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at com.MeetingManager.MeetingManager.TimerMethod(MeetingManager.java:171) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at com.MeetingManager.MeetingManager$2.run(MeetingManager.java:68) 
12-14 09:39:29.584: ERROR/AndroidRuntime(572):  at java.util.Timer$TimerImpl.run(Timer.java:289) 

Answer 1

您的異常意味着你正試圖從一個非UI線程修改用戶界面，在Android中，的唯一主題，可以更新用戶界面是UIThread，所以還是傳統問題，你應該強制UIThread改變的UserInterface你的線程裏面是這樣的：

//Code of your Method TimerMethod 
//...... 
YourActivity.this.runOnUiThread(new Runnable() { 
    public void run() { 
     //your changes on your UserInterface (TextViews in your Case) . 
    } 
});