I am working on an app which is used to place product requests. More of like a shopping app. The user will get offers when the admin posts one.
I used firebase and created a root called offers and the offers are added as child under the offers node.
i have created a firebasebackground listener service and added onChildEventListener. When ever a new offer is posted the user is notified with the offer.
Firebasebackgroundservice.java:
public class FirebaseBackgroundService extends Service {
private DatabaseReference f;
NotificationManager manager;
Notification myNotication;
private TinyDB database;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public int onStartCommand(Intent intent,int flags,int startId) {
super.onCreate();
manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
database=new TinyDB(getApplicationContext());
FirebaseApp.initializeApp(getApplicationContext());
f= FirebaseDatabase.getInstance().getReference();
final DatabaseReference foff=f.child("offers");
foff.limitToLast(1).addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
ArrayList<String>offarray=new ArrayList<String>();
offarray=database.getListString("offdata");
if(!offarray.contains(dataSnapshot.getKey())){
offarray.add(dataSnapshot.getKey());
database.putListString("offdata",offarray);
Map<String, Object> newPost = (Map<String, Object>) dataSnapshot.getValue();
String title=newPost.get("title").toString();
String code=newPost.get("code").toString();
postNotif(title,code);
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
//Order updates
String uname=database.getString("uname");
final DatabaseReference fupd=f.child("users").child(uname).child("notif");
fupd.limitToLast(1).addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
ArrayList<String>offarray=new ArrayList<String>();
offarray=database.getListString("updata");
if(!offarray.contains(dataSnapshot.getKey())){
offarray.add(dataSnapshot.getKey());
database.putListString("updata",offarray);
Map<String, Object> newPost = (Map<String, Object>) dataSnapshot.getValue();
String title=newPost.get("title").toString();
String code=newPost.get("code").toString();
updateNotif(title,code);
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return START_STICKY;
}
private void postNotif(String title,String descp) {
Context context=getApplicationContext();
Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Bitmap icon = BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);
try {
int smallIcon = R.drawable.ic_card;
long when = System.currentTimeMillis();
CharSequence contentTitle = title;
CharSequence contentText = descp;
Intent notificationIntent = new Intent(context,OfferActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
NotificationManager notificationManager =(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
.setWhen(when)
.setContentText(contentText)
.setContentTitle(contentTitle)
.setSmallIcon(smallIcon)
.setAutoCancel(true)
.setTicker(contentTitle)
.setLargeIcon(icon)
.setContentIntent(pendingIntent)
.setSound(alarmSound);
notificationManager.notify((int) when, notificationBuilder.build());
} catch (Exception e) {
Log.e("Notification Exception", e.getMessage());
}
}
private void updateNotif(String title,String descp) {
Context context=getApplicationContext();
Bitmap icon = BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);
Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
try {
int smallIcon = R.drawable.ic_file_upload;
long when = System.currentTimeMillis();
CharSequence contentTitle = title;
CharSequence contentText = descp;
Intent notificationIntent = new Intent(context,Notifications.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
NotificationManager notificationManager =(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
.setWhen(when)
.setContentText(contentText)
.setContentTitle(contentTitle)
.setSmallIcon(smallIcon)
.setAutoCancel(true)
.setTicker(contentTitle)
.setLargeIcon(icon)
.setContentIntent(pendingIntent)
.setSound(alarmSound);
notificationManager.notify((int) when, notificationBuilder.build());
} catch (Exception e) {
Log.e("Notification Exception", e.getMessage());
}
}
@Override
public void onDestroy(){
super.onDestroy();
startService(new Intent(this,FirebaseBackgroundService.class));
}
}
The app is working fine but I am facing two issues here:
1. When the service is started initially the notifications are shown. But at times the service is being killed by the OS. And when the service is restarted the notifications are not shown. The service is being killed and is not restarted for a long time.
2. The childAddedListener is not called after the service resumes and hence the notifications are also not shown
The app works perfectly fine on first start of service. once the service is killed the notifications are not shown and the childaddedlistener is not working
Please help me with this. I searched a lot for firebasebackgroundservice but ended up with this. Thank you.
