Open the location settings when clicking the GPS notification.

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.location.LocationManager;

import android.provider.Settings;

import android.util.Slog;

import android.view.View;

import android.widget.ImageView;

        try {

            if (visible) {

                Intent gpsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);

                gpsIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, gpsIntent, 0);

                Notification n = new Notification.Builder(mContext)

                    .setSmallIcon(iconId)

                    .setContentTitle(mContext.getText(textResId))

                    .setOngoing(true)

                    .setContentIntent(pendingIntent)

                    .getNotification();

                // Notification.Builder will helpfully fill these out for you no matter what you do