Get the actual location and update it

android/app/build.gradle

@@ -37,6 +37,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'com.google.android.material:material:1.2.0-alpha06'
+    implementation "com.google.android.gms:play-services-location:17.0.0"
     implementation 'androidx.preference:preference:1.1.1'
     testImplementation 'junit:junit:4.13'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'

android/app/src/main/AndroidManifest.xml

@@ -2,6 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.hft.geotracker">
 
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+
+    <!-- Required if your app targets Android 10 (API level 29) or higher -->
+    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION"/>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

android/app/src/main/java/de/hft/geotracker/MainActivity.kt

@@ -1,9 +1,13 @@
 package de.hft.geotracker
 
+import android.Manifest.permission.ACCESS_FINE_LOCATION
 import android.annotation.SuppressLint
 import android.content.Intent
+import android.content.pm.PackageManager
+import android.location.Location
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.os.Looper
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
@@ -11,20 +15,46 @@ import android.view.Window
 import android.widget.ArrayAdapter
 import android.widget.AutoCompleteTextView
 import android.widget.Spinner
+import android.widget.TextView
+import androidx.core.app.ActivityCompat
+import androidx.core.app.ActivityCompat.requestPermissions
 import androidx.navigation.findNavController
 import androidx.databinding.DataBindingUtil
 import androidx.navigation.ui.NavigationUI
+import com.google.android.gms.location.*
 import com.google.android.material.textfield.TextInputLayout
+import java.util.jar.Manifest
 
 
 class MainActivity : AppCompatActivity() {
-
+    lateinit var fusedLocationClient : FusedLocationProviderClient
+    lateinit var locationRequest : LocationRequest
+    lateinit var locationCallback: LocationCallback
+    lateinit var actionButton : TextView
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setSupportActionBar(findViewById(R.id.my_toolbar))
         setContentView(R.layout.activity_home)
 
+        //        val builder = LocationSettingsRequest.Builder().addLocationRequest(locationRequest)
+        createLocationRequest()
+        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
+        if (ActivityCompat.checkSelfPermission(this, ACCESS_FINE_LOCATION) !=
+                PackageManager.PERMISSION_GRANTED) {
+            requestPermissions(this, arrayOf(ACCESS_FINE_LOCATION), 1000)
+        }
+        locationCallback = object : LocationCallback() {
+            override fun onLocationResult(locationResult: LocationResult?) {
+                locationResult ?: return
+                for (location in locationResult.locations){
+                    // Update UI with location data
+                    findViewById<TextView>(R.id.latitude).text = location.latitude.toString()
+                    findViewById<TextView>(R.id.longitude).text = location.longitude.toString()
+                    findViewById<TextView>(R.id.altitude).text = location.altitude.toString()
+                }
+            }
+        }
 //        val binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
 //        val navController = this.findNavController(R.id.HostFragment)
 //        NavigationUI.setupActionBarWithNavController(this, navController)
@@ -49,8 +79,43 @@ class MainActivity : AppCompatActivity() {
             // Apply the adapter to the spinner
             spinner.adapter = adapter
         }
+        actionButton = findViewById(R.id.button_start_stop)
+        actionButton.setOnClickListener {
+            callStartStop()
+        }
     }
 
+    private fun callStartStop() {
+        println("StartStop pressed")
+        fusedLocationClient.lastLocation
+            .addOnSuccessListener { location : Location? ->
+                if (location != null) {
+                    var label = findViewById<TextView>(R.id.display_acc)
+                    label.text = location.latitude.toString()
+
+                } else {
+                    println("Location = null")
+                }
+            }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        startLocationUpdates()
+    }
+
+    private fun startLocationUpdates() {
+        fusedLocationClient.requestLocationUpdates(locationRequest,
+            locationCallback,
+            Looper.getMainLooper())
+    }
+    fun createLocationRequest() {
+        locationRequest = LocationRequest.create().apply {
+            interval = 10000
+            fastestInterval = 5000
+            priority = LocationRequest.PRIORITY_HIGH_ACCURACY
+        }
+    }
     override fun onOptionsItemSelected(item: MenuItem) = when (item.itemId) {
         R.id.settings -> {
             // User chose the "Settings" item, show the app settings UI...

android/app/src/main/res/layout/activity_home.xml

@@ -83,9 +83,42 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/my_toolbar" />
 
+    <TextView
+        android:id="@+id/altitude"
+        style="@style/text_style"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="dummy"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/longitude" />
 
+    <TextView
+        android:id="@+id/latitude"
+        style="@style/text_style"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:text="dummy"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/display_acc" />
 
-
+    <TextView
+        android:id="@+id/longitude"
+        style="@style/text_style"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:text="dummy"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/latitude" />
 
 
 </androidx.constraintlayout.widget.ConstraintLayout>