Send data to activity when Firebase notification is clicked in Android

问题

In my application I want use fireBase for notification.
I want when click on notification (when app is closed, my mean is app is background) send data with putExtra to mainActivity.
I write below codes, but when click on notification (in app is background) but show me null for getStringExtra !

MyNotificationManager class :

public class MyNotificationManager {

    private Context mCtx;
    private Uri soundUri;
    private static MyNotificationManager mInstance;

    public MyNotificationManager(Context context) {
        mCtx = context;
    }

    public static synchronized MyNotificationManager getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MyNotificationManager(context);
        }
        return mInstance;
    }

    public void displayNotification(String title, String body) {

        soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        Intent intent = new Intent(mCtx, MainActivity.class);
        intent.putExtra("fcm_notification", "Y");

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

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mCtx, Constants.NOTIF_CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setSound(soundUri)
                .setAutoCancel(true)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setContentText(body)
                .setContentIntent(pendingIntent);

        NotificationManager mNotifyMgr = (NotificationManager) mCtx.getSystemService(NOTIFICATION_SERVICE);

        if (mNotifyMgr != null) {
            mNotifyMgr.notify(1, mBuilder.build());
        }
    }
}

MyFirebaseMessagingService class :

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        showNotify(remoteMessage.getFrom(), remoteMessage.getNotification().getBody());
    }

    private void showNotify(String title, String body) {
        MyNotificationManager myNotificationManager = new MyNotificationManager(getApplicationContext());
        //myNotificationManager.displayNotification(title, body);
        myNotificationManager.displayNotification(title, body);
    }
}

MainActivity class :

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

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            checkIntent();
        }
    }, 1000);
}

private boolean checkIntent() {
    String value = getIntent().getStringExtra("fcm_notification");
    Toast.makeText(context, "" + value, Toast.LENGTH_SHORT).show();

    if (value == null) return false;

    if (value.equals("Y")) {
        startActivity(new Intent(this, LandingActivity.class));
        // open one activity.

    } else if (value.equals("another thing")) {
        // open another activity.
    }

    finish();
    return true;
}

When click on notification (on app is background) , show me null message in Toast for this line String value = getIntent().getStringExtra("fcm_notification");

How can i fix it?

回答1:

When sending notification from console, add the custom data from 'Advanced options':

For some reason, firebase doesn't allow the key to start with fcm. You cannot use fcm_notification. Use a different key.

For above image, receive the key as follows:

String value = getIntent().getStringExtra("test_key");

回答2:

Try this:

Intent intent = new Intent(mCtx, MainActivity.class);
intent.putExtra("EXTRA_DATA", title);

And to get:

String value = getIntent().getStringExtra("EXTRA_DATA");

Better to change the key. Also, it seems like you'll need to send a data from console and then, sending the data to the another Activity.

I've used the current notification title to check if it returns the title or not.If it returned the value, so, try sending data from the console.

来源：https://stackoverflow.com/questions/52576080/send-data-to-activity-when-firebase-notification-is-clicked-in-android