無法啓動接收器異常

問題：應用程序不時會在啓動時拋出異常，但並非總是如此。我不明白爲什麼有些時候會發生，但有些時候不會。任何建議將非常感激。無法啓動接收器異常

某些日誌：

04-18 17:58:12.437: E/AndroidRuntime(26208): FATAL EXCEPTION: main 
04-18 17:58:12.437: E/AndroidRuntime(26208): java.lang.RuntimeException: Unable to start receiver com.cm.clou.ContactsListUpdateReceiver: java.lang.NullPointerException 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1805) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.app.ActivityThread.access$2400(ActivityThread.java:117) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:981) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.os.Looper.loop(Looper.java:130) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at java.lang.reflect.Method.invokeNative(Native Method) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at java.lang.reflect.Method.invoke(Method.java:507) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at dalvik.system.NativeStart.main(Native Method) 
04-18 17:58:12.437: E/AndroidRuntime(26208): Caused by: java.lang.NullPointerException 
04-18 17:58:12.437: E/AndroidRuntime(26208): at com.cm.clou.ConversationsListActivity.notifyAdaper(ConversationsListActivity.java:270) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at com.cm.clou.ContactsListUpdateReceiver.onReceive(ContactsListUpdateReceiver.java:17) 
04-18 17:58:12.437: E/AndroidRuntime(26208): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1794)

接收器的代碼：

public class ContactsListUpdateReceiver extends BroadcastReceiver { 

    public static final String TAG = ContactsListUpdateReceiver.class.getSimpleName(); 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     String message = intent.getStringExtra("message"); 
     if (message != null) { 
      Log.d(TAG, "Uslishali otvet ot servisa po apdejtu contactov: " + message); 
      ConversationsListActivity.notifyAdaper(context); 
     } 
    } 

}

在清單：

<receiver 
    android:name="com.cm.clou.ContactsListUpdateReceiver" 
    android:enabled="true" 
    android:exported="false" > 
    <intent-filter> 
     <action android:name="com.cm.clou.ACTION_CONTACTS_LIST_UPDATE" /> 
    </intent-filter> 
</receiver>

而且我notifyAdaper代碼：

private static ConversationsListCursorAdapter conversationsListCursorAdapter = null; 
@SuppressLint("NewApi") 
    public static void notifyAdaper(Context context) { 

     Uri uri = ClouContentProvider.CONVERSATIONS_CONTENT_URI; 
     Cursor cursor = null; 

     if (android.os.Build.VERSION.SDK_INT < 11) { 
      cursor = context.getContentResolver().query(uri, null, null, null, null); 
     } else { 
      CursorLoader cursorLoader = new CursorLoader(context, uri, null, null, null, null); 
      cursor = cursorLoader.loadInBackground(); 
     } 

     conversationsListCursorAdapter.changeCursor(cursor); 
     conversationsListCursorAdapter.notifyDataSetChanged(); 
    }

來源

2013-04-18 SerijVeter

線270是什麼？ – Sam

notifyAdaper的第270行是什麼？ – njzk2

conversationsListCursorAdapter似乎爲空。 – njzk2

看起來像你永遠不會實例化conversationsListCursorAdapter。

您需要在訪問它之前實例化它。

來源

2013-04-18 15:17:00 BobTheBuilder

看起來我的服務比conversationsListCursorAdapter啓動更快地向廣播接收者發送消息。我在我的AsyncTask的onPostExecute中啓動它。但是在這個AsyncTask被稱爲兩個服務之前。所以這一定是我的問題。謝謝你的建議。 – SerijVeter

無法啓動接收器異常

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