Android：サービス操作でハンドラとスレッドを挿入する

私のアプリケーションでバックグラウンドで実行されるサービスがあります。今私がしたいことは、私のサービスが起動したときに、バックグラウンド操作がperformed.Myコードされたときに、進行状況ダイアログが表示されますです：Android：サービス操作でハンドラとスレッドを挿入する

public class WService extends 
     Service implements Runnable { 
      private String TAG_SPV= 
     "SPV>service>WService"; private 
     ProgressDialog pd;  
      NotificationFactory nf;  Parse 
     parse; DAOSymbol dao; WSClient 
     responseClient; List<Quote> quotes; 
      Map<String, Symbol> symbols; 
       private boolean on; 

      public IBinder onBind(Intent 
     intent) { 
         return null; } 

      @Override public void onCreate() { 
       // TODO Auto-generated method stub 
       super.onCreate(); 
       Log.i(TAG_SPV,"responseTojsonArray"); 
       parse = new Parse();  dao = new 
     DAOSymbol();  quotes = new 
     ArrayList<Quote>();  symbols = new 
     HashMap<String, Symbol>(); 


         startService(new Intent(this, 
         br.com.ops.service.NotificationFactory.class)); 




         pd = ProgressDialog.show(this, 
     "Downloading..", "Please wait", 
     true, 
           false); 

         Thread thread = new Thread(this);  thread.start();  } 

      @Override public void 
     onStart(Intent intent, int startId) 
     {   on = true; 
       super.onStart(intent, startId); 
       Log.i(TAG_SPV,"onStart"); } 
      private Handler handler = new 
     Handler() { 
       @Override 
       public void handleMessage(Message msg) { 
         pd.dismiss(); 


       } }; 


      @SuppressWarnings("unchecked") 
      public void run() { 
       Log.i(TAG_SPV,"run");  if (on) { 
        dao.open(getBaseContext()); 
        //Perform some DB operations as well as hit web service 

        dao.close(); 
        handler.postDelayed(this, 30000); 
       } } }

私は次のエラーを取得しています：

06-18 01:12:16.793: ERROR/AndroidRuntime(737): Uncaught handler: thread main exiting due to uncaught exception 06-18 01:12:16.823: ERROR/AndroidRuntime(737): java.lang.RuntimeException: Unable to create service br.com.ops.service.WarnningService: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2790) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ActivityThread.access$3200(ActivityThread.java:119) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1917) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.os.Handler.dispatchMessage(Handler.java:99) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.os.Looper.loop(Looper.java:123) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ActivityThread.main(ActivityThread.java:4363) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at java.lang.reflect.Method.invokeNative(Native Method) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at java.lang.reflect.Method.invoke(Method.java:521) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at dalvik.system.NativeStart.main(Native Method) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.view.ViewRoot.setView(ViewRoot.java:472) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.Dialog.show(Dialog.java:239) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ProgressDialog.show(ProgressDialog.java:107) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ProgressDialog.show(ProgressDialog.java:95) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at br.com.ops.service.WarnningService.onCreate(WarnningService.java:56) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2780) 06-18 01:12:16.823: ERROR/AndroidRuntime(737): ... 10 more

私を助けてください..この操作ではハンドラの役割についてはわかりません。

出典

2011-06-17 Rohan K