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Sending notification from IntentService is not working?

I'm trying to send a notification from an IntentService.
I do get all the logs, but I don't get the notification (Using my galaxy s8 instead of an emulator).
I've tried to extend Service and I have tried to use a scheduler, but both did not work.
Service Code:
public class AppService extends IntentService {
private NotificationManager mNotificationManager;
public static final int NOTIFICATION_ID = 1;
public AppService() {
super("AppService");
}
#Override
protected void onHandleIntent(#Nullable Intent intent) {
Log.d("AppService", "Started");
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
// Restore interrupt status.
Thread.currentThread().interrupt();
}
Log.d("AppService", "Sending notification");
sendNotification("We might have some brand new movies to offer you!");
Log.d("AppService", "Notification sent");
}
private void sendNotification(String msg) {
mNotificationManager = (NotificationManager)
this.getSystemService(Context.NOTIFICATION_SERVICE);
Log.d("AppService", "1");
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent(this, Analyze.class), 0);
Log.d("AppService", "2");
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setContentTitle("MyCienma")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(msg))
.setSmallIcon(R.drawable.icon_500x500_no_edge)
.setContentText(msg);
Log.d("AppService", "3");
mBuilder.setContentIntent(contentIntent);
Log.d("AppService", "4");
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
Log.d("AppService", "5");
}
}
I do get all the Logs, but I don't get any notification.
My project's min version is 21 and my phone is running 26. Is that a problem?

Yes, just because you have to set the notification channel id after android version 8.0(api 26).
Reference link:here
Hope! this will help you.
Happy coding...

After API v26 you have to define a NotificationChannel for every notification
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("default",
"YOUR_CHANNEL_NAME",
NotificationManager.IMPORTANCE_DEFAULT);
channel.setDescription("YOUR_NOTIFICATION_CHANNEL_DISCRIPTION");
mNotificationManager.createNotificationChannel(channel);
}

Local Notification not working while save video recording

I want to just Generate a notification after save Video.
for this i'll try below code :
public void stopRecordingVideo() {
ContentValues values = new ContentValues();
values.put(MediaStore.Video.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4");
values.put(MediaStore.MediaColumns.DATA, file.toString());
activity.getContentResolver().insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, values);
Toast.makeText(activity, "Video saved: " + file, Toast.LENGTH_SHORT).show();
//Log.v(TAG, "Video saved: " + getVideoFile(context));
Log.v(TAG, "Video saved: " + file);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(activity)
.setSmallIcon(R.drawable.ic_launcher_background) // notification icon
.setContentTitle("Notification!") // title for notification
.setContentText("Hello word") // message for notification
.setAutoCancel(true); // clear notification after click
Intent intent = new Intent(activity, RecorderActivity.class);
PendingIntent pi = PendingIntent.getActivity(activity,0,intent, PendingIntent.FLAG_UPDATE_CURRENT);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mBuilder.setContentIntent(pi);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, mBuilder.build());
} else{
// do something for phones running an SDK before lollipop
}
try{
mMediaRecorder.stop();
mMediaRecorder.release();
}catch(RuntimeException stopException){
//handle cleanup here
}
try {
mSession.stopRepeating();
} catch (CameraAccessException e) {
e.printStackTrace();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
setup2Record();
} else {
finish(); //just blows up anyway.
}
}
Video save perfectly in Storage and Toast msg also show. but only notification not generated please help for this solution.

Solution:
On Android 8.0 (Oreo) you must have something called as a NotificationChannel So try the below implementation:
Step1: Create Notification Channel
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = getString(R.string.channel_name);
String description = getString(R.string.channel_description);
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
channel.setDescription(description);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
}
Finally: Then your Notification:
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(activity)
.setSmallIcon(R.drawable.ic_launcher_background) // notification icon
.setContentTitle("Notification!") // title for notification
.setContentText("Hello word") // message for notification
.setAutoCancel(true); // clear notification after click
Intent intent = new Intent(activity, RecorderActivity.class);
PendingIntent pi = PendingIntent.getActivity(activity,0,intent, PendingIntent.FLAG_UPDATE_CURRENT);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mBuilder.setContentIntent(pi);
notificationManager.notify(1, mBuilder.build());
Try this, Hope it helps.

Android Java Notification To Alarm

How do I rebuilt my Notification to get a 'Notification Alarm'
I tried varois things but nothing worked, I am really frustated so I finally ask here.
Main Activity:
public void sendNotificationIfTimeEnd01() {
Context context = getApplicationContext();
Intent intent01 = new Intent(context, MainActivity.class);
PendingIntent pendingIntent01 = PendingIntent.getActivity(this, 1, intent01, 0);
NotificationCompat.Builder builder01 = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_stat_notification)
.setContentIntent(pendingIntent01)
.setAutoCancel(true)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher))
.setContentTitle(gamesJuliToStringArray[1])
.setContentText("Spiel ist bereit")
.setSubText("click");
NotificationManager notificationManager = (NotificationManager) getSystemService(
NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID_01, builder01.build());
try {
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
r.play();
} catch (Exception e) {
e.printStackTrace();
}
}
Condition in my Fragment:
if (!notification062 && !buttonColor02.equals("red02")) {
activity.sendNotificationIfTimeEnd01();
}
Again I get Notifications if the conditions happens, but only inside of my application.
Need help for rebuilding this into and alarm notification

Here you can see an example of the AlarmManager being used to schedule a notification for a later time, given a specific delay.

Android Notification into Alert Notification

I built an notification which works so far.
Since I did not know that it works only inside of my application I read through some articles and saw that I need an 'Alarm Notification'.
I tried varous things but none did not work, now I am asking here.
My Notification in my Mainactivity looks like this:
public static final int NOTIFICATION_ID_01 = 1;
public void sendNotificationIfTimeEnd01() {
Context context = getApplicationContext();
Intent intent01 = new Intent(context, MainActivity.class);
PendingIntent pendingIntent01 = PendingIntent.getActivity(this, 1, intent01, 0);
NotificationCompat.Builder builder01 = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_stat_notification)
.setContentIntent(pendingIntent01)
.setAutoCancel(true)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher))
.setContentTitle(gamesJuliToStringArray[0])
.setContentText("Ready")
.setSubText("click");
NotificationManager notificationManager = (NotificationManager) getSystemService(
NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID_01, builder01.build());
try {
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
r.play();
} catch (Exception e) {
e.printStackTrace();
}
}
I am accesing this notification in my Fragment if a specific conditions happens:
final MainActivity activity = (MainActivity) getActivity();
if (i = 10) {
activity.sendNotificationIfTimeEnd01();
editor.putBoolean("notification01", true);
editor.apply();
}
Again I want to transform this Notification into an 'Alarm' / 'Alarm Notification'.
I appreciate any response!

Android java sent notification once

How do I sent the notification only once if something happens?
I got this statement:
if (diffDays <= 0 && diffHours <= 0 && diffMinutes <= 0) {
activity.sendNotificationIfTimeEnd01();
Log.d("MyApp", "I am here");
}
and this:
public void sendNotificationIfTimeEnd01() {
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse("https://www.google.de/?gws_rd=ssl"));
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setSmallIcon(R.drawable.ic_stat_notification);
builder.setContentIntent(pendingIntent);
builder.setAutoCancel(true);
builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
builder.setContentTitle("String one");
builder.setContentText("bla");
builder.setSubText("blabla");
NotificationManager notificationManager = (NotificationManager) getSystemService(
NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID, builder.build());
try {
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
r.play();
} catch (Exception e) {
e.printStackTrace();
}
}
I do get the notification if the statement is right, but if I close the app and start it I get the notification again.(Statement is still right);

Try using SharedPreferences as bleeding182 adviced you. This is a good answer on how to do that:
How to use SharedPreferences in Android to store, fetch and edit values