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

public class WakeLock : MonoBehaviour {

AndroidJavaObject ActivityObject; //use for non-static calls
AndroidJavaClass ActivityClass; //use for non-static calls

// Use this for initialization
void Start () {
    Debug.Log("About to start the wake lock");
    AndroidJNI.AttachCurrentThread();
    ActivityClass = new AndroidJavaClass("com.wakelock.MainActivity");
    ActivityClass.CallStatic("start");
    ActivityObject = ActivityClass.GetStatic<AndroidJavaObject>("instance");

    string s = ActivityObject.Call<string>("SetWakeLock");
    Debug.Log(s);
    Debug.Log("Completed the wake lock!");
}

void OnDestroy()
{
    ActivityObject.Call("ReleaseWakeLock");
}

public class MainActivity extends Fragment {

WakeLock wakeLock;
public static MainActivity instance; // Singleton instance

public static void start()
{
    // Instantiate Fragment.
    instance = new MainActivity();
    // Add to the current 'Activity' (a static reference is stored in 'UnityPlayer').
    UnityPlayer.currentActivity.getFragmentManager().beginTransaction().add(instance, "MainActivity").commit();
}

public String SetWakeLock()
{
    Activity activity = getActivity();
    PowerManager powerManager = (PowerManager) activity.getSystemService(activity.POWER_SERVICE);
    wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
            "MyApp::MyWakelockTag");
    wakeLock.acquire();
    return "Success!";
}


public void ReleaseWakeLock()
{
    wakeLock.release();
}