I have used in this manner to start a specific activity:
FireBaseMessagingService.java
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
//The message will contain the Push Message
String message = remoteMessage.getData().get("message");
//imageUri will contain URL of the image to be displayed with Notification
String imageUri = remoteMessage.getData().get("image");
//title for the notification.
String title = remoteMessage.getData().get("title");
//action string to perform the action e.g. open activity
String action = remoteMessage.getData().get("click_action");
//To get a Bitmap image from the URL received
bitmap = getBitmapfromUrl(imageUri);
//method for functioning the notification --->
sendNotification(message, title, bitmap, action);
}
private void sendNotification(String messageBody, String title, Bitmap image, String action) {
Intent intent = new Intent(this, SpecificActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("title", title);
ByteArrayOutputStream _bs = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.PNG, 50, _bs);
intent.putExtra("img", image);
intent.putExtra("msg", messageBody);
intent.putExtra("click_action", action);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new
NotificationCompat.Builder(this, "Default")
.setLargeIcon(image)/*Notification icon image*/
.setSmallIcon(R.mipmap.app_icon)
.setStyle(new NotificationCompat.BigPictureStyle().bigPicture(image))/*Notification with Image*/
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setPriority(Notification.PRIORITY_HIGH)
.setChannelId("Default")
.setVibrate(new long[]{1000, 1000})
.setContentIntent(pendingIntent);
notificationBuilder.setContentTitle(title);
notificationBuilder.setContentText(messageBody);
notificationBuilder.setAutoCancel(true);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
After this Add the following lines in the specificActivity.java part in the AndroidManifest.xml file:
<activity
android:name=".SpecificActivity">
<intent-filter>
<action android:name="OPEN_ACTIVITY" />
<!-- Add this OPEN_ACTIVITY string into your data payload while sending the notification from server side. -->
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
After this get the intent in the specific activity you are starting i.e. SpecificActivity.java file's onCreate() method.
if (getIntent().getExtras() != null) {
for (String key : getIntent().getExtras().keySet())
{
String value = getIntent().getExtras().getString(key);
if (key.equals("click_action")) {
//perform the action you want to do with the key.
}
After adding these you are good to check the notifications from your mobile end.