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接收器未注册

2014-02-26 101 views
2

我有一个程序与异步任务和广播接收器发送结果代码，以便Asynctask知道该应用程序正在工作。但是它的崩溃，说接收器在主要活动中没有注册。我在主要活动中注册了一个接收者，另一个接收者在AsyncTask Activity中。所以这里的代码和日志猫。接收器未注册

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mFragmentManager = getFragmentManager(); 
    addFriendsFragment(); 

    // The feed is fresh if it was downloaded less than 2 minutes ago 
    mIsFresh = (System.currentTimeMillis() - getFileStreamPath(
      TWEET_FILENAME).lastModified()) < TWO_MIN; 

    ensureData(); 

} 

// Add Friends Fragment to Activity 
private void addFriendsFragment() { 

    mFriendsFragment = new FriendsFragment(); 
    mFriendsFragment.setArguments(getIntent().getExtras()); 

    FragmentTransaction transaction = mFragmentManager.beginTransaction(); 
    transaction.add(R.id.fragment_container, mFriendsFragment); 

    transaction.commit(); 
} 

// If stored Tweets are not fresh, reload them from network 
// Otherwise, load them from file 
private void ensureData() { 

    log("In ensureData(), mIsFresh:" + mIsFresh); 

    if (!mIsFresh) { 

     // TODO: 
     // Show a Toast Notification to inform user that 
     // the app is "Downloading Tweets from Network" 
     log ("Issuing Toast Message"); 
      Toast toast = Toast.makeText(getApplicationContext(), 
        "Downloading Tweets from Network",Toast.LENGTH_LONG); 
      toast.show(); 

     // TODO: 
     // Start new AsyncTask to download Tweets from network 
      new DownloaderTask(MainActivity.this).execute(MainActivity.URL_LGAGA, MainActivity.URL_RBLACK, MainActivity.URL_TSWIFT); 


     // Set up a BroadcastReceiver to receive an Intent when download 
     // finishes. 
     mRefreshReceiver = new BroadcastReceiver() { 
      @Override 
      public void onReceive(Context context, Intent intent) { 

       log("BroadcastIntent received in MainActivity"); 

       // TODO:     
       // Check to make sure this is an ordered broadcast 
       // Let sender know that the Intent was received 
       // by setting result code to RESULT_OK 
       sendOrderedBroadcast(new Intent(), null, null, null, RESULT_OK, null, null); 

      } 
     }; 

    } else { 

     loadTweetsFromFile(); 
     parseJSON(); 
     updateFeed(); 

    } 
} 

// Called when new Tweets have been downloaded 
public void setRefreshed(String[] feeds) { 

    mRawFeeds[0] = feeds[0]; 
    mRawFeeds[1] = feeds[1]; 
    mRawFeeds[2] = feeds[2]; 

    parseJSON(); 
    updateFeed(); 
    mIsFresh = true; 

}; 

// Called when a Friend is clicked on 
@Override 
public void onItemSelected(int position) { 

    mFeedSelected = position; 
    mFeedFragment = addFeedFragment(); 

    if (mIsFresh) { 
     updateFeed(); 
    } 
} 

// Calls FeedFragement.update, passing in the 
// the tweets for the currently selected friend 

void updateFeed() { 

    if (null != mFeedFragment) 

     mFeedFragment.update(mProcessedFeeds[mFeedSelected]); 

} 

// Add FeedFragment to Activity 
private FeedFragment addFeedFragment() { 
    FeedFragment feedFragment; 
    feedFragment = new FeedFragment(); 

    FragmentTransaction transaction = mFragmentManager.beginTransaction(); 

    transaction.replace(R.id.fragment_container, feedFragment); 
    transaction.addToBackStack(null); 

    transaction.commit(); 
    mFragmentManager.executePendingTransactions(); 
    return feedFragment; 

} 

// Register the BroadcastReceiver 
@Override 
protected void onResume() { 
    super.onResume(); 

    // TODO: 
    // Register the BroadcastReceiver to receive a 
    // DATA_REFRESHED_ACTION broadcast 

    IntentFilter intentFilter = new IntentFilter(DATA_REFRESHED_ACTION); 
    registerReceiver(mRefreshReceiver, intentFilter); 


} 

@Override 
protected void onPause() { 

    // TODO: 
    // Unregister the BroadcastReceiver 
    unregisterReceiver(mRefreshReceiver); 



    super.onPause(); 

}

logcat的：

02-26 01:39:58.466: E/AndroidRuntime(943): FATAL EXCEPTION: main 
02-26 01:39:58.466: E/AndroidRuntime(943): java.lang.RuntimeException: Unable to pause activity {course.labs.notificationslab/course.labs.notificationslab.MainActivity}: java.lang.IllegalArgumentException: Receiver not registered: null 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3064) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3019) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2997) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.access$800(ActivityThread.java:141) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1273) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.os.Looper.loop(Looper.java:137) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.main(ActivityThread.java:5103) 
02-26 01:39:58.466: E/AndroidRuntime(943): at java.lang.reflect.Method.invokeNative(Native Method) 
02-26 01:39:58.466: E/AndroidRuntime(943): at java.lang.reflect.Method.invoke(Method.java:525) 
02-26 01:39:58.466: E/AndroidRuntime(943): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
02-26 01:39:58.466: E/AndroidRuntime(943): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-26 01:39:58.466: E/AndroidRuntime(943): at dalvik.system.NativeStart.main(Native Method) 
02-26 01:39:58.466: E/AndroidRuntime(943): Caused by: java.lang.IllegalArgumentException: Receiver not registered: null 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:662) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1372) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:468) 
02-26 01:39:58.466: E/AndroidRuntime(943): at course.labs.notificationslab.MainActivity.onPause(MainActivity.java:195) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.Activity.performPause(Activity.java:5235) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1233) 
02-26 01:39:58.466: E/AndroidRuntime(943): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3050) 
02-26 01:39:58.466: E/AndroidRuntime(943): ... 12 more

这里是的AsyncTask代码，但logcat的说，一个错误是主要的。

mApplicationContext.sendOrderedBroadcast(
      new Intent(MainActivity.DATA_REFRESHED_ACTION), 
      null, 
      new BroadcastReceiver() { 

       final String failMsg = "Download has failed. Please retry Later."; 
       final String successMsg = "Download completed successfully."; 

       @Override 
       public void onReceive(Context context, Intent intent) { 

        log("Entered result receiver's onReceive() method"); 

        // TODO: Check whether the result code is RESULT_OK 

        if (getResultCode() == Activity.RESULT_OK) { 

         // TODO: If so, create a PendingIntent using the 
         // restartMainActivityIntent and set its flags 
         // to FLAG_UPDATE_CURRENT 

         final PendingIntent pendingIntent = PendingIntent.getActivity(mApplicationContext, 
           0, restartMainActivtyIntent, PendingIntent.FLAG_UPDATE_CURRENT); 



         // Uses R.layout.custom_notification for the 
         // layout of the notification View. The xml 
         // file is in res/layout/custom_notification.xml 

         RemoteViews mContentView = new RemoteViews(
           mApplicationContext.getPackageName(), 
           R.layout.custom_notification); 

         // TODO: Set the notification View's text to 
         // reflect whether or the download completed 
         // successfully 

         if (success){       
         mContentView.setTextViewText(MY_NOTIFICATION_ID, successMsg); 
         }else{ 
          mContentView.setTextViewText(MY_NOTIFICATION_ID, failMsg); 
         } 

         // TODO: Use the Notification.Builder class to 
         // create the Notification. You will have to set 
         // several pieces of information. You can use 
         // android.R.drawable.stat_sys_warning 
         // for the small icon. You should also setAutoCancel(true). 



         // TODO: Send the notification 

         Notification notification = new Notification.Builder(mApplicationContext) 
         .setContentIntent(pendingIntent) 
         .setSmallIcon(android.R.drawable.stat_sys_warning) 
         .setAutoCancel(true) 
         .build();    

         NotificationManager notificationManager = 
           (NotificationManager)mApplicationContext.getSystemService(Context.NOTIFICATION_SERVICE); 
         notificationManager.notify(MY_NOTIFICATION_ID, notification); 

         log("Notification Area Notification sent"); 
        } 
       } 
      }, 
      null, 
      0, 
      null, 
      null); 
}

来源

2014-02-26 Mabjik

+1

问题是我试图注销接收器，即使没有它的实例。如果（mRefreshReceiver！= null）{ unregisterReceiver（mRefreshReceiver）; } – Mabjik

+0

您是否已将接收器添加到清单文件中？ –

+0

我已经发现问题了。这是我试图注销一个接收器，但我没有检查它是否存在。 – Mabjik

回答

2

尝试如下...

mRefreshReceiver = new BroadcastReceiver() { 

     @Override 
     public void onReceive(Context context, Intent intent) { 

      log("BroadcastIntent received in MainActivity"); 

     } 
    }

在onResume() ...

@Override 
protected void onResume() { 
    super.onResume(); 

    IntentFilter filter = new IntentFilter(DATA_REFRESHED_ACTION);  
    registerReceiver(mRefreshReceiver, filter); 

}

在AsyncTask ....

Intent intent = new Intent(DATA_REFRESHED_ACTION); 
    sendOrderedBroadcast(intent, null, new BroadcastReceiver() { 

     @SuppressLint("NewApi") 
     @Override 
     public void onReceive(Context context, Intent intent) { 

      log("BroadcastIntent received in MainActivity"); 

     } 
    }, null, Activity.RESULT_OK, null, null); 
}

你可以按照下面的链接...

Android sendOrderedBroadcast Example

来源

2014-02-27 04:49:56

+0

我可能需要在onPause registerReceiver（mRefreshReceiver，filter）中取消注册此侦听器; – user3233280

0

因为你的广播接收器仅在创建时（！mIsFresh）。
因此，在某些情况下，您的广播接收器因为mIsFresh而不是实例。
因此，onResume注册广播接收器的空值。
当onPause尝试取消注册时，会发生错误。

来源

2015-03-12 07:42:14 tana

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