@Kosiara96Takie coś znalazłem w internecie.
Step 1. Just head to Settings > Sound and Notifications
Step 2. At the Bottom of the Sounds and Notification Window, choose "Application notifications". You have to select whatever notification you want to display on the lock screen. I choose "Messages" and "Email".
Step 3. Set whatever application you want to "Set as a priority". I choose "Messages" for example.
Step 4. After this is done, you have a new option that will display under the "Sounds and Notification" screen called "While Locked".
Step 5. Press "While Locked" and choose any of the three settings:
1. Show all content - Will show messages as they are on the lock screen,
2. Hide Sensitive Content will show as a message but not show the content on the lock screen,
3. Do not show notifications - Self Exclamatory.
Nie wiem czy to będzie pomocne.