Develop Reference

how to handle FCM background state in the android

In the android, FCM notification comes and app is in the background state and when tapped, it redirects to Default Activity (LoginActivity) but I want to navigate to specified activity (HomeActivity).
NotificationCompat.Builder notification = new NotificationCompat.Builder(this, "CHANNEL_1");
notification/*.setSound(soundUri)*/
.setSmallIcon(R.drawable.ic_photo_camera_black_24dp)
.setColor(getResources().getColor(R.color.colorAccent))
.setAutoCancel(true)
.setContentTitle(title)
.setContentText(message);
Intent intent = new Intent(this, HomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent,
0);
notification.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, notification.build());

you will need to pass an activity parameter from the api/json part. from your app side you will check for the activity nave and than open accordingly
see this solution https://stackoverflow.com/a/39665485/6442746 for more insights.

You should send a format is Data Message to handle notification in onMessageReceived when the app is background or foreground
When received data in onMessageReceived(), you can show notification and direct to your activity.

android: how to call activity by clicking foreground service notification

I start a foreground service which shows a notification. If my activity is hidden I want it start by clicking on the notification.
A function called in onStartCommand does this:
startForeground(noti_id, mNoti);
The notification appears and works but it doesn't reactivate my MainActivity:
notiIntent = new Intent(this, MainGate.class);
notiPendingIntent = PendingIntent.getActivity(this, 0, notiIntent, PendingIntent.FLAG_UPDATE_CURRENT);
MainGate.class is the activity which starts the foreground service. It should appear when I click on the notification.
EDIT:
Actually, it worked when the notification was built in the man activity (MainGate.class). And it worked when notification was built in the service not being foreground service. Now I had to implement the foreground service and it stopped working.

try this solution
Intent notificationIntent = new Intent(this, MainGate.class);
PendingIntent pendingIntent=PendingIntent.getActivity(this, 0,
notificationIntent, Intent.FLAG_ACTIVITY_NEW_TASK);
Notification notification=new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentText(getString(R.string.isRecording))
.setContentIntent(pendingIntent).build();
startForeground(NOTIFICATION_ID, notification);

How can I dismiss notifications upon firing an intent on Android Wear?

I'm currently building a notification on the mobile device, and including a wear-specific intent to launch an activity. I want the notification to go away once the user hits that button on the notification, but I haven't gotten it to work. Here's my code
Intent actionIntent = new Intent(context, LauncherService.class);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, actionIntent, PendingIntent.FLAG_CANCEL_CURRENT);
// Create the action
NotificationCompat.Action action =
new NotificationCompat.Action.Builder(R.drawable.buzz_icon_white,
"Respond with Buzz", pendingIntent)
.build();
// Build the notification and add the action with WearableExtender
Notification notification =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.buzz_icon_white)
.setContentTitle("Buzz")
.setContentText(name + ": " + message)
.extend(new WearableExtender().addAction(action))
.setAutoCancel(true)
.setPriority(1)
.setVibrate(pattern)
.build();
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(context);
// Issue the notification with notification manager.
notificationManager.notify(notificationId, notification);

Notification does not work properly on some devices

In my app I use a service for background work(send data to server) when my app is in the background.So I create a notification which tells to the user that app is running in the background.I want when the user taps on the notification my app to come to the foreground so I use an Intent like this that android use to launch my app
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.final_driver_notification_icon)
.setContentTitle("...")
.setContentText("...");
final Intent notintent = new Intent(getApplicationContext(),EntryScreen.class);
notintent.setAction(Intent.ACTION_MAIN);
notintent.addCategory(Intent.CATEGORY_LAUNCHER);
PendingIntent pendint = PendingIntent.getActivity(this, 0, notintent, 0);
mBuilder.setContentIntent(pendint);
int notID = 001;
startForeground(notID, mBuilder.build());
In the emulator and some physical devices works perfect.But in some other it launches the app from the start(It puts Entry screen in the top).
Any idea why is this happening?

You should start your service with startForeground(). this is the way to start a service in foreground and report by a notification. Android - implementing startForeground for a service?
or try something like this:
public void initForeground() {
Intent intentForeground = new Intent(this, Activity.class);
intentForeground.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intentForeground,0);
pendingIntent.cancel();
pendingIntent = PendingIntent.getActivity(this, 0, intentForeground,0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.icon)
.setContentIntent(pendingIntent)
.setContentTitle(getString(R.string.app_name))
.setContentText(getString(R.string.something))
.setTicker(getString(R.string.something))
.setAutoCancel(false);
Notification notification = mBuilder.build();
startForeground(myID, notification);
}
Hope it helps you!

how to start aplication or bring to front when user clicks on a notification click on android

I'm working whit push notifications.
When a user clicks on a notification I want to start the application in case it is not started, or bring it to front in case it is started.
Thanks

this is the complite code I found the answer here Bring application to front after user clicks on home button
Intent intent = new Intent(ctx, SplashScreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT),
PendingIntent.FLAG_CANCEL_CURRENT);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
ctx).setContentTitle(extras.getString("title"))
.setContentText(extras.getString("message"))
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(contentIntent);
Notification noti = mBuilder.build();
noti.flags = Notification.DEFAULT_LIGHTS
| Notification.FLAG_AUTO_CANCEL;
mNotificationManager.notify(NOTIFICATION_ID, noti);
The important things are the flags on the Intent, this will open the app or bring it to front if is opened, or do nothing if you click on the notification while you are browsing the app

implement pending intent.
Code
Intent pi = new Intent();
pi.setClass(getApplicationContext(), youactivity.class);
// The PendingIntent to launch our activity if the user selects this notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,pi, PendingIntent.FLAG_UPDATE_CURRENT);
String msgText = mMessage;
// construct the Notification object.
Notification notif = new Notification(R.drawable.icon, msgText,System.currentTimeMillis());
manifest
<activity android:name="com.InfoActivity" android:noHistory="false android:excludeFromRecents="false"></activity>

Just set the intent for the notification, this is covered in details in the official API guide.

You do that by creating a PendingIntent.
For example, this will launch a MainActivity when notification is clicked.
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
Notification noti = new Notification.Builder(this)
.setContentTitle("Notication title")
.setContentText("Content text")
.setContentIntent(pendingIntent).build();

I don't know whether you're talking about Google Cloud Messaging or not. But if it is a normal Notification then while creating your notification you've to provide Pending Intent. Just put your desired class in Pending intent so that when user clicks on that notification you'll be driven to your so called Application. A snippet :
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this,
"Your application activity".class), PendingIntent."Flag you want");
After this use this intent while creating notification. It's method is setContentIntent("above intent") and fire your notification with NotificationManager!