Bind to service and display location updates in activity.

app/src/main/java/com/proculite/logmylocation/LocationLoggingService.java

@@ -23,20 +23,25 @@ public class LocationLoggingService extends Service implements LocationListener
 
     @Override
     public IBinder onBind(Intent intent) {
-        return null;
+        return new LocationLoggingServiceBinder(this);
     }
 
-    @SuppressLint("MissingPermission")
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         Log.d(TAG, "Service started.");
 
-        LocationManager locationManager = (LocationManager) getSystemService(Service.LOCATION_SERVICE);
+        subscribeToLocationUpdates(this);
-        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
 
         return super.onStartCommand(intent, flags, startId);
     }
 
+    @SuppressLint("MissingPermission")
+    public void subscribeToLocationUpdates(LocationListener locationListener)
+    {
+        LocationManager locationManager = (LocationManager) getSystemService(Service.LOCATION_SERVICE);
+        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
+    }
+
     @Override
     public void onDestroy() {
         Log.d(TAG, "Service has been destroyed.");

app/src/main/java/com/proculite/logmylocation/LocationLoggingServiceBinder.java

@@ -0,0 +1,15 @@
+package com.proculite.logmylocation;
+
+import android.os.Binder;
+
+public class LocationLoggingServiceBinder extends Binder {
+    public final LocationLoggingService service;
+
+    public LocationLoggingServiceBinder(LocationLoggingService service){
+        this.service = service;
+    }
+
+    public LocationLoggingService getService(){
+        return this.service;
+    }
+}

app/src/main/java/com/proculite/logmylocation/MainActivity.java

@@ -1,15 +1,25 @@
 package com.proculite.logmylocation;
 
+import android.content.ComponentName;
+import android.content.Context;
 import android.content.Intent;
+import android.content.ServiceConnection;
+import android.location.Location;
+import android.location.LocationListener;
 import android.os.Bundle;
+import android.os.IBinder;
+import android.util.Log;
+import android.widget.TextView;
 
 import androidx.activity.EdgeToEdge;
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends AppCompatActivity implements LocationListener, ServiceConnection {
+    private final String TAG = MainActivity.class.getName();
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -26,4 +36,55 @@ public class MainActivity extends AppCompatActivity {
             return insets;
         });
     }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+
+        // Bind to service.
+        Intent intent = new Intent(this, LocationLoggingService.class);
+        bindService(intent, this, Context.BIND_AUTO_CREATE);
+    }
+
+    @Override
+    public void onLocationChanged(@NonNull Location location) {
+        TextView textView = findViewById(R.id.textViewMain);
+
+        String currentLocation = String.format(
+                "Latitude: %s\n" +
+                "Longitude: %s\n" +
+                "Altitude: %s\n" +
+                "Accuracy radius in meters: %s\n",
+                location.getLatitude(),
+                location.getLongitude(),
+                location.getAltitude(),
+                location.getAccuracy()
+        );
+        textView.setText(currentLocation);
+    }
+
+    @Override
+    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
+        Log.d(TAG, "Service connected.");
+
+        LocationLoggingServiceBinder binder = (LocationLoggingServiceBinder) iBinder;
+        binder.getService().subscribeToLocationUpdates(this);
+    }
+
+    @Override
+    public void onServiceDisconnected(ComponentName componentName) {
+        Log.d(TAG, "Service disconnected.");
+    }
+
+    @Override
+    public void onBindingDied(ComponentName name) {
+        Log.d(TAG, "Service binding died.");
+        ServiceConnection.super.onBindingDied(name);
+    }
+
+    @Override
+    public void onNullBinding(ComponentName name) {
+        Log.d(TAG, "Service null binding.");
+        ServiceConnection.super.onNullBinding(name);
+    }
 }

app/src/main/res/layout/activity_main.xml

@@ -8,6 +8,8 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:textAlignment="center"
+        android:id="@+id/textViewMain"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"