Question

my apps background process stops on device rebooting. What to do to make it always running also after device booted. Because my notification did not show on device boot

Answer 1

You have to use BroadcastReceiver. and call your process inside this class. And in your manifest,

<receiver android:name=".BroadCastClass">
  <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
  </intent-filter>
</receiver>

And add uses permission.

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />