Android Notification PendingIntent Extras null

问题:

I am trying to send information from notification to invoked activity, while from my activity I got null.

The code for notification is:

private void showNotification() {
Intent resultIntent = new Intent(this, MainActivity.class);
if (D)
    Log.d(TAG, "Id: " + Id);
resultIntent.putExtra("ineedid", deviceId);

TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addParentStack(MeterActivity.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
    PendingIntent.FLAG_UPDATE_CURRENT);
// Bundle tmp = resultIntent.getExtras();
// if (tmp == null) {
// Log.d(TAG, "tmp bundle is null");
// } else {
// long id = tmp.getLong("ineedid", -1);
// Log.d(TAG, "tmp id : " + id);
// }
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
    BLEMessengerService.this)
    .setSmallIcon(R.drawable.ic_action_search)
    .setContentTitle("Event tracker")
    .setContentText("Events received").setOngoing(true)
    .setContentIntent(resultPendingIntent)
    .setWhen(System.currentTimeMillis());

int mId = R.string.service_notification_start_service;
mNM.notify(mId, mBuilder.getNotification());
}

Code for get information from intent in main activity;

Bundle extras = getIntent().getExtras();
if (extras != null) {
    long deviceID = getIntent().getLongExtra("ineedid",
        -1);
    if (ID == -1) {
    if (D)
        Log.i(TAG_D, "Wrong Id received.");
    finish();
    } else {
    device = dataSource.getDeviceByID(deviceID);
    if (D)
        Log.i(TAG_D, "Get the id.");
    }
} else {
    if (D)
    Log.d(TAG_D, "Bundle is null");
    finish();
}

I have verified before the notification get notified, bundle is not null, and it has id in extras. While, when I tried to fetch it from intent, it's gone. Help.

回答1:

in PendingIntent use this flag PendingIntent.FLAG_UPDATE_CURRENT it's work for me

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

回答2:

For me, in addition to setting Intent.FLAG_ACTIVITY_SINGLE_TOP , I had to add a unique action to the intent:

    Intent resultIntent = new Intent(caller, NotificationActivity.class);

    String xId = getNextUniqueId();
    resultIntent.putExtra("x_id", xId);
    resultIntent.setAction(xId);
    resultIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

.. without the setAction(..), Extras is null on the Intent received by my NotificationActivity.

This post helps explain it: https://stackoverflow.com/a/3128271/2162226

回答3:

I just got the answer, add line: resultIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

NOTICE: if you add it as resultIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); It won't work.

I also tried other flags like, "FLAG_ACTIVITY_NEW_TASK" and "FLAG_ACTIVITY_RESET_TASK_IF_NEEDED". neither works here.

回答4:

I was working in a local notifications plugin for Unity when I encountered the same problem -> I launched the app, scheduled the local notification, sent the app to background, local notification appeared and, when I clicked on it, app was resumed and getIntent().getExtras() was null.

In my case, the problem was I was trying to get the extras at the wrong intent. Try to print the intents with a simple toString, at the creation moment and when you get it, to ensure that the received is what you expect.

Also take a look to the onNewIntent method.

回答5:

When an activity is launched(when it is first started ) or relaunched(when it's brought to the top of the stack) the getIntent().getExtra() won't give null. But when the activity is present on the top of the stack then on starting that activity with the use of PendingIntent would not relaunch the activity(onCreate() won't get called) instead onResume() would be called. And getIntent().getExtra() would return the value which is associated with the intent that started the activity(which is null).
In order to update the intent do the following steps:

1). Set FLAG_ACTIVITY_SINGLE_TOP and FLAG_ACTIVITY_CLEAR_TOP flags in your intent.

resultIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);

2). Override onNewIntent() in the activity where getIntent().getExtra() is called. This method is called by FLAG_ACTIVITY_SINGLE_TOP

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    setIntent(intent);
}

For more info: See this doc