How to record your screen in Android Lollipop: Make a screencast in Android Lollipop without rooting your phone or tablet
Step 2. The app is very simple, with just three options. The first lets you change the recording resolution. Keep in mind that you'll be sending the video to someone else, so by reducing the resolution you will be able to reduce the file size. 
The second option notes whether the screen will be recorded in portrait or landscape operation. If you want to switch mode you simply turn the device on its side. 
The third option lets you enable recording from the microphone, which is not enabled by default. This is a very useful option, since with most Android phones it won't be obvious which button you have tapped without the recipient also being able to see your finger. By enabling audio you can tell them what you're pressing as you go along, and they'll be able to see onscreen the results of each button press. Also see: Best Android phones 2015. 
How to record your screen in Android Lollipop: Make a screencast in Android Lollipop without rooting your phone or tablet
Step 3. Once you've selected your options and are ready to begin recording just tap the circular icon at the top right of the screen. The first time you use Lollipop Screen Recorder it will inform you that it will now record everything on your screen. Tap the box for 'Don't show again', then tap Start Now. You can then exit the app and set about recording whatever it is you want to include in the screencast. 
How to record your screen in Android Lollipop: Make a screencast in Android Lollipop without rooting your phone or tablet
Step 4. To finish recording, drag down the notification bar at the top of the screen. Look for a notification that says 'Recording screen', with the video resolution below. To stop recording tap Stop. 
How to record your screen in Android Lollipop: Make a screencast in Android Lollipop without rooting your phone or tablet
Step 5. To find your screen recording simply re-open the Lollipop Screen Recorder app and it will be visible on the main screen. If you have a file manager app on your phone you'll also find it in the ScreenRecordings folder. Also see: Best Android tablets 2015. 
How to record your screen in Android Lollipop: Make a screencast in Android Lollipop without rooting your phone or tablet
Step 6. Within the Lollipop Screen Recorder app you'll find options to play, share and delete the file. Your sharing options will depend on what other apps you have installed on your phone, but expect to at least find Bluetooth, Gmail and Messaging here.