add overlay and location tracking

18-wander/README.md

@@ -2,9 +2,9 @@
 
 A Google Maps app that displays customized maps and the user's location.
 
-<!-- <p align="center">
+<p align="center">
 <img src="screenshot.png" style="width:528px;max-width: 100%;">
-</p> -->
+</p>
 
 ## Features
 
@@ -16,7 +16,4 @@ A Google Maps app that displays customized maps and the user's location.
 - enabling the user to place a marker on a point of interest.
 - enabling location tracking.
 
-Based on 2 tutorials by Google Codelabs (2022):
-
-- [Android Google Maps](https://codelabs.developers.google.com/codelabs/advanced-android-kotlin-training-maps)
-- [Adding Geofencing to Your Map](https://codelabs.developers.google.com/codelabs/advanced-android-kotlin-training-geofencing)
+Based on [Android Google Maps](https://codelabs.developers.google.com/codelabs/advanced-android-kotlin-training-maps) by Google Codelabs (2022).

18-wander/app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.hfad.wander">
-
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

18-wander/app/src/main/java/com/hfad/wander/MapsActivity.kt

@@ -1,20 +1,21 @@
 package com.hfad.wander
 
+import android.Manifest
+import android.content.pm.PackageManager
 import android.content.res.Resources
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 
 import com.google.android.gms.maps.CameraUpdateFactory
 import com.google.android.gms.maps.GoogleMap
 import com.google.android.gms.maps.OnMapReadyCallback
 import com.google.android.gms.maps.SupportMapFragment
-import com.google.android.gms.maps.model.BitmapDescriptorFactory
-import com.google.android.gms.maps.model.LatLng
-import com.google.android.gms.maps.model.MapStyleOptions
-import com.google.android.gms.maps.model.MarkerOptions
+import com.google.android.gms.maps.model.*
 import com.hfad.wander.databinding.ActivityMapsBinding
 import java.util.*
 
@@ -23,6 +24,7 @@ class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
     private lateinit var map: GoogleMap
     private lateinit var binding: ActivityMapsBinding
     private val TAG = MapsActivity::class.java.simpleName
+    private val REQUEST_LOCATION_PERMISSION = 1
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -83,13 +85,34 @@ class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
         val latitude = 43.60886861403767
         val longitude = 3.879782838452318
         val homeLatLng = LatLng(latitude, longitude)
-        val zoomLevel = 15f
+        val zoomLevel = 18f
         map.addMarker(MarkerOptions().position(homeLatLng))
         map.moveCamera(CameraUpdateFactory.newLatLngZoom(homeLatLng, zoomLevel))
 
+        // add a ground overlay
+        val overlaySize = 100f
+        val androidOverlay = GroundOverlayOptions()
+            .image(BitmapDescriptorFactory.fromResource(R.drawable.android))
+            .position(homeLatLng, overlaySize)
+        map.addGroundOverlay(androidOverlay)
+
         setMapLongClick(map)
         setPoiClick(map)
         setMapStyle(map)
+        enableMyLocation()
+    }
+
+    override fun onRequestPermissionsResult(
+        requestCode: Int,
+        permissions: Array<out String>,
+        grantResults: IntArray
+    ) {
+        if (requestCode == REQUEST_LOCATION_PERMISSION) {
+            if (grantResults.contains(PackageManager.PERMISSION_GRANTED)) {
+                enableMyLocation()
+            }
+        }
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
     }
 
     // allow users to add a marker
@@ -125,6 +148,7 @@ class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
     }
 
     // add custom style
+    // use https://mapstyle.withgoogle.com/ to generate your json file
     private fun setMapStyle(map: GoogleMap) {
         try {
             val success = map.setMapStyle(
@@ -140,4 +164,25 @@ class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
             Log.e(TAG, "Can't find style. Error: ", e)
         }
     }
+
+    // check permissions
+    private fun isPermissionGranted() : Boolean {
+        return ContextCompat.checkSelfPermission(
+            this,
+            Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
+    }
+
+    // enable location tracking
+    private fun enableMyLocation() {
+        if (isPermissionGranted()) {
+            map.isMyLocationEnabled = true
+        }
+        else {
+            ActivityCompat.requestPermissions(
+                this,
+                arrayOf<String>(Manifest.permission.ACCESS_FINE_LOCATION),
+                REQUEST_LOCATION_PERMISSION
+            )
+        }
+    }
 }