public void sendEmployeeWorkNotification(String ticker, String title, String text, String loc, int employee_id) {
    PendingIntent pendingIntent;
    Intent intent;
    Context currentContext = G.context;

    if (loc.equals("LOC")) {
        intent = new Intent(currentContext, PeopleSingleScene_Activity.class);
        intent.putExtra("people_id", employee_id);
        pendingIntent = PendingIntent.getActivity(currentContext, 0, intent, 0);
    } else {
        //some other actions
    }
    NotificationCompat.Builder builder = new NotificationCompat.Builder(currentContext, CHANNEL_ID)
        .setSmallIcon(R.drawable.vector_notif)
        .setTicker(ticker)
        .setContentTitle(title)
        .setContentText(text)
        .setColor(ContextCompat.getColor(currentContext, R.color.rcOutcome))
        .setStyle(new NotificationCompat.BigTextStyle()
                .bigText(text))
        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
        .setContentIntent(pendingIntent)
        .setAutoCancel(true);
    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(currentContext);

    notificationManager.notify(G.simpleMessageCounter, builder.build());
    simpleSong(R.raw.notificationsimple);
    G.simpleMessageCounter++;
}

public class SomeActivityClass extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.some_layout);
        G.context = this;
        ....
    }
    ....
}

public class App extends Application {
    private static Context mContext;

    @Override
    public void onCreate() {
        super.onCreate();
        mContext = this;
    }

    public static Context getContext(){
        return mContext;
    }

    public static String getStr(int resid) {
        return mContext.getResources().getString(resid);
    }
}