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我在我的應用程序中實現了推送通知。當應用程序被打開或它在後臺時，它們運行良好，但當應用程序關閉時，屏幕上會顯示一條提示消息，說明應用程序中出現了問題。Android：推送通知崩潰應用程序
這裏有一段實現推送通知的代碼。
public class GcmIntentService extends IntentService {
public static final int NOTIFICATION_ID = 1;
private NotificationManager mNotificationManager;
NotificationCompat.Builder builder;
FeedReaderDbHelperMessages mDbHelper;
/**
* Tag used on log messages.
*/
static final String TAG = "GCM Intent";
/**
* Db access object
* */
public GcmIntentService() {
super("GcmIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
Bundle extras = intent.getExtras();
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
// The getMessageType() intent parameter must be the intent you received
// in your BroadcastReceiver.
String messageType = gcm.getMessageType(intent);
if (!extras.isEmpty()) { // has effect of unparcelling Bundle
/*
/*
* Filter messages based on message type. Since it is likely that GCM
* will be extended in the future with new message types, just ignore
* any message types you're not interested in, or that you don't
* recognize.
*/
if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
sendNotification(extras);
} else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) {
sendNotification(extras);
// If it's a regular GCM message, do some work.
} else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
// Post notification of received message.
sendNotification(extras);
Intent i = new Intent("android.intent.action.MAIN").putExtras(extras);
this.sendBroadcast(i);
Log.i(TAG, "Received: " + extras.toString());
}
}
// Release the wake lock provided by the WakefulBroadcastReceiver.
GcmBroadcastReceiver.completeWakefulIntent(intent);
}
// Put the message into a notification and post it.
// This is just one simple example of what you might choose to do with
// a GCM message.
private void sendNotification(Bundle msg) {
FacebookSdk.sdkInitialize(getApplicationContext());
Profile userProfile = Profile.getCurrentProfile();
String user_id = userProfile.getId();
mNotificationManager = (NotificationManager)
this.getSystemService(Context.NOTIFICATION_SERVICE);
Intent newIntent = new Intent(this, drawnerActivity.class);
newIntent.setAction("OPEN_NOTIFICATION");
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,newIntent, 0);
mDbHelper = new FeedReaderDbHelperMessages(getApplicationContext());
UpdateMessages updateMessages = new UpdateMessages(mDbHelper);
if(msg.getString("notificationType").equals("question"))
{
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.logo_notifica_domanda_mini)
.setContentTitle("MyApp")
.setStyle(new NotificationCompat.BigTextStyle().bigText("New question"))
.setContentText("New question");
Vibrator v = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(400);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
updateMessages.update(user_id);
}
if(msg.getString("notificationType").equals("answer"))
{
Contact userAnswer = ContactListFragment.findContactById(msg.getString("friendId"));
Timestamp notificationTimestamp = Timestamp.valueOf(msg.getString("timestamp"));
Log.i(TAG, "Answer notification received from: "+ userAnswer.getName() + " timestamp: " + notificationTimestamp.toString());
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.logo_mini_dialog)
.setContentTitle("MyApp")
.setStyle(new NotificationCompat.BigTextStyle().bigText("New answer"))
.setContentText(userAnswer.getName() + " answered");
Vibrator v = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
long[] pattern = {
0, // Start immediately
100,
100,
100
};
v.vibrate(pattern, -1);
//updateMessages.updateRowWithAnswer(msg.getString("questionId"), msg.getString("answer"));
FeedReaderDbHelperNotification mDbHelperNotifications = new FeedReaderDbHelperNotification(getApplicationContext());
UpdateNotifications updateNotifications = new UpdateNotifications(mDbHelperNotifications, mDbHelper);
updateNotifications.update(user_id);
//NotificationFragment.addNotification(new NotificationImpl(notificationTimestamp, 1, 0, msg.getString("questionId"), ""), getApplication().getApplicationContext());
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
}
}
問題是NullPointerException這裏String user_id = userProfile.getId();。 userProfile來自com.facebook.Profile類，因爲我使用facebook sdk來保持會話。爲什麼它是空的？
這裏有堆棧跟蹤
java.lang.NullPointerException
at com.bellantoni.chetta.lieme.GcmIntentService.sendNotification(GcmIntentService.java:80)
at com.bellantoni.chetta.lieme.GcmIntentService.onHandleIntent(GcmIntentService.java:63)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:61)