diff --git a/gpsrelaysentinel/src/main/AndroidManifest.xml b/gpsrelaysentinel/src/main/AndroidManifest.xml
index 2c92a4a..4966b18 100644
--- a/gpsrelaysentinel/src/main/AndroidManifest.xml
+++ b/gpsrelaysentinel/src/main/AndroidManifest.xml
@@ -5,6 +5,7 @@
 
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
 
     <application
         android:allowBackup="true"
diff --git a/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainActivity.java b/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainActivity.java
index 9909ba1..fd9e7cb 100644
--- a/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainActivity.java
+++ b/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainActivity.java
@@ -3,6 +3,8 @@ package cc.winboll.studio.gpsrelaysentinel;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
+import android.widget.CompoundButton;
+import android.widget.Switch;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import cc.winboll.studio.libappbase.LogView;
@@ -11,6 +13,7 @@ import cc.winboll.studio.libappbase.ToastUtils;
 public class MainActivity extends AppCompatActivity {
 
 	LogView mLogView;
+	Switch mSwitchService;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -21,6 +24,21 @@ public class MainActivity extends AppCompatActivity {
 		setSupportActionBar(toolbar);
 
         mLogView = findViewById(R.id.logview);
+        mSwitchService = findViewById(R.id.switch_service);
+
+        mSwitchService.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                Intent intent = new Intent(MainActivity.this, MainService.class);
+                if (isChecked) {
+                    startForegroundService(intent);
+                    ToastUtils.show("GPS Service started");
+                } else {
+                    stopService(intent);
+                    ToastUtils.show("GPS Service stopped");
+                }
+            }
+        });
 
         ToastUtils.show("onCreate");
     }
diff --git a/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainService.java b/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainService.java
index 976a6db..6de85b6 100644
--- a/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainService.java
+++ b/gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainService.java
@@ -1,13 +1,19 @@
 package cc.winboll.studio.gpsrelaysentinel;
 
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
 import android.app.Service;
 import android.content.Context;
 import android.content.Intent;
 import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
+import android.os.Binder;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.IBinder;
+import androidx.core.app.NotificationCompat;
 import cc.winboll.studio.libappbase.LogUtils;
 
 public class MainService extends Service {
@@ -16,11 +22,17 @@ public class MainService extends Service {
     private LocationManager mLocationManager;
     private LocationListener mLocationListener;
     private boolean mIsRunning = false;
+    private NotificationManager mNotificationManager;
+    private NotificationCompat.Builder mNotificationBuilder;
+    private static final String CHANNEL_ID = "gps_relay_channel";
+    private static final int NOTIFICATION_ID = 1;
 
     @Override
     public void onCreate() {
         super.onCreate();
         LogUtils.d(TAG, "Service onCreate");
+        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+        createNotificationChannel();
     }
 
     @Override
@@ -39,7 +51,9 @@ public class MainService extends Service {
         mLocationListener = new LocationListener() {
             @Override
             public void onLocationChanged(Location location) {
-                LogUtils.d(TAG, "Location changed: " + location.getLatitude() + ", " + location.getLongitude());
+                String gpsInfo = "Lat: " + location.getLatitude() + ", Lng: " + location.getLongitude();
+                LogUtils.d(TAG, "Location changed: " + gpsInfo);
+                updateNotification(gpsInfo);
             }
 
             @Override
@@ -68,12 +82,42 @@ public class MainService extends Service {
                 );
                 LogUtils.d(TAG, "GPS location updates requested");
                 mIsRunning = true;
+                startForegroundNotification();
             }
         } catch (SecurityException e) {
             LogUtils.e(TAG, "Permission denied: " + e.getMessage());
         }
     }
 
+    private void createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationChannel channel = new NotificationChannel(
+                CHANNEL_ID,
+                "GPS Relay Service",
+                NotificationManager.IMPORTANCE_LOW
+            );
+            channel.setDescription("GPS Relay Sentinel service channel");
+            mNotificationManager.createNotificationChannel(channel);
+        }
+    }
+
+    private void startForegroundNotification() {
+        mNotificationBuilder = new NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle("GPS Relay Service")
+            .setContentText("Waiting for GPS data...")
+            .setSmallIcon(android.R.drawable.ic_menu_mylocation)
+            .setOngoing(true);
+        Notification notification = mNotificationBuilder.build();
+        startForeground(NOTIFICATION_ID, notification);
+    }
+
+    private void updateNotification(String gpsInfo) {
+        if (mNotificationBuilder != null) {
+            mNotificationBuilder.setContentText(gpsInfo);
+            mNotificationManager.notify(NOTIFICATION_ID, mNotificationBuilder.build());
+        }
+    }
+
     @Override
     public IBinder onBind(Intent intent) {
         return null;
diff --git a/gpsrelaysentinel/src/main/res/layout/activity_main.xml b/gpsrelaysentinel/src/main/res/layout/activity_main.xml
index 5e86607..4a333f2 100644
--- a/gpsrelaysentinel/src/main/res/layout/activity_main.xml
+++ b/gpsrelaysentinel/src/main/res/layout/activity_main.xml
@@ -32,6 +32,13 @@
 			android:text="GPSRelaySentinel"
 			android:textAppearance="?android:attr/textAppearanceLarge"/>
 
+		<Switch
+			android:id="@+id/switch_service"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="GPS Service"
+			android:checked="false"/>
+
 		<Button
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"