Initial Setup

First and foremost, in order to fetch a list of used applications, we need to secure USAGE ACCESS permission from the user. For that, declare below line in the application's Manifest.xml

       <uses-permission
        android:name="android.permission.PACKAGE_USAGE_STATS"
        tools:ignore="ProtectedPermissions" />

& to check, if the permission is granted or not, call

          if (Monitor.hasUsagePermission())
        else
            Monitor.requestUsagePermission();