Android Lollipop helpfully now gives you notifications on your lock screen – you can even action them without unlocking the device. But notifications flashing up on the home screen does present a privacy issue, because not everyone wants their personal texts and emails visible to whoever wakes the device.
To turn this off follow following Steps below.
Step 1: Go to Settings
Step 2: Sound & Notification
Step 3: When Device is Locked and select “don’t show notifications at all”.