Adding better recenter algorithm following the location

app/src/main/java/uca/baptistearthur/geocaching/MainWindow.kt

@@ -9,6 +9,8 @@ import org.osmdroid.config.Configuration
 class MainWindow: AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
 
+        val map = Map();
+
         super.onCreate(savedInstanceState)
         setContentView(R.layout.main_window)
 
@@ -22,7 +24,7 @@ class MainWindow: AppCompatActivity() {
                     true
                 }
                 R.id.map -> {
-                    loadFragment(Map())
+                    loadFragment(map)
                     true
                 }
                 R.id.list -> {

app/src/main/java/uca/baptistearthur/geocaching/Map.kt

@@ -17,6 +17,7 @@ import android.Manifest.permission.ACCESS_FINE_LOCATION
 import android.hardware.SensorManager
 import android.location.Location
 import android.location.LocationListener
+import android.widget.ProgressBar
 import androidx.activity.result.contract.ActivityResultContracts
 import org.osmdroid.views.overlay.compass.CompassOverlay
 import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider
@@ -26,13 +27,16 @@ import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay
 
 class Map : Fragment() {
     private lateinit var map : MapView
+    private lateinit var spinner: ProgressBar;
     val defaultPoint = GeoPoint(48.8583, 2.2944)
     var isMapCentered = false;
+
     val locationListener = object : LocationListener {
         override fun onLocationChanged(location: Location) {
             val geoPoint = GeoPoint(location.latitude, location.longitude)
             if(!isMapCentered){
                 map.controller.setCenter(geoPoint)
+                spinner.visibility=View.GONE;
                 isMapCentered=true;
             }
             map.invalidate()
@@ -50,7 +54,10 @@ class Map : Fragment() {
 
     private fun configureMap(view: View){
         map = view.findViewById(R.id.mapView)
-        map.controller.setZoom(20.0);
+        spinner = view.findViewById(R.id.mapLoading);
+        spinner.visibility=View.VISIBLE;
+        map.minZoomLevel = 10.0
+        map.controller.setZoom(21.0);
         if (ContextCompat.checkSelfPermission(requireActivity(), ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
             requestPermissionLauncher.launch(ACCESS_FINE_LOCATION)
         }
@@ -65,7 +72,6 @@ class Map : Fragment() {
         map.overlays.add(scaleBarOverlay)
 
         val myLocation = MyLocationNewOverlay(GpsMyLocationProvider(context), map)
-        myLocation.enableFollowLocation()
         myLocation.enableMyLocation()
         map.overlays.add(myLocation)
 

app/src/main/java/uca/baptistearthur/geocaching/RecenterOverlay.kt

@@ -1,25 +1,23 @@
 package uca.baptistearthur.geocaching
 
 import android.graphics.*
-import android.graphics.drawable.shapes.Shape
 import android.location.Location
 import android.view.GestureDetector
 import android.view.MotionEvent
-import androidx.appcompat.widget.AppCompatDrawableManager
 import androidx.core.content.ContextCompat
 import org.osmdroid.util.GeoPoint
 import org.osmdroid.views.MapView
 import org.osmdroid.views.overlay.Overlay
 import org.osmdroid.views.overlay.mylocation.IMyLocationConsumer
 import org.osmdroid.views.overlay.mylocation.IMyLocationProvider
+import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay
 
 
-class RecenterOverlay(val myLocationProvider: IMyLocationProvider, val mapView: MapView) : Overlay(), GestureDetector.OnGestureListener, IMyLocationConsumer {
+class RecenterOverlay(val myLocationProvider: IMyLocationProvider, val mapView: MapView) : Overlay(), IMyLocationConsumer {
-
-    private val gestureDetector: GestureDetector = GestureDetector(mapView.context, this)
-    private var circleRectF=RectF();
-
 
+    private var circleRectF=RectF()
+    private var mIsFollowing = false
+    private var mLocation: Location? = null
     override fun draw(canvas: Canvas, mapView: MapView, shadow: Boolean) {
 
         val circleSize = 300f
@@ -49,20 +47,47 @@ class RecenterOverlay(val myLocationProvider: IMyLocationProvider, val mapView:
         icon?.draw(canvas)
     }
 
+    override fun onLocationChanged(location: Location, source: IMyLocationProvider) {
+        mLocation = myLocationProvider.lastKnownLocation
+        if (mIsFollowing) {
+            mapView.controller.animateTo(GeoPoint(location.latitude, location.longitude));
+        } else {
+            mapView.postInvalidate();
+        }
+    }
+
     fun enableMyLocation() {
+        mLocation = myLocationProvider.lastKnownLocation
+        mIsFollowing = true;
+        if(mLocation!=null) {
+            mapView.controller?.animateTo(GeoPoint(mLocation!!.latitude, mLocation!!.longitude))
+        }
         myLocationProvider.startLocationProvider(this);
     }
 
     fun disableMyLocation(){
+        mapView.controller?.stopAnimation(false)
+        mIsFollowing = false
         myLocationProvider.stopLocationProvider();
     }
 
+    override fun onTouchEvent(event: MotionEvent?, mapView: MapView?): Boolean {
+        val isSingleFingerDrag =
+            event!!.action == MotionEvent.ACTION_MOVE && event.pointerCount == 1
+        if (event.action == MotionEvent.ACTION_DOWN) {
+            disableMyLocation()
+        } else if (isSingleFingerDrag && mIsFollowing) {
+            return true // prevent the pan
+        }
+        return super.onTouchEvent(event, mapView)
+    }
+
     override fun onSingleTapConfirmed(e: MotionEvent?, mapView: MapView?) =
         myLocationProvider.lastKnownLocation?.let {
             if (e != null && circleRectF.contains(e.x, e.y)) {
                 mapView?.controller?.setCenter(GeoPoint(it.latitude, it.longitude))
-                mapView?.controller?.setZoom(20.0);
+                mapView?.controller?.setZoom(21.0);
-
+                enableMyLocation()
             }
             true
         } ?: false
@@ -82,12 +107,4 @@ class RecenterOverlay(val myLocationProvider: IMyLocationProvider, val mapView:
         disableMyLocation()
         super.onDetach(mapView)
     }
-
-    override fun onDown(p0: MotionEvent) = true
-    override fun onShowPress(p0: MotionEvent) = Unit
-    override fun onSingleTapUp(p0: MotionEvent) = true
-    override fun onScroll(p0: MotionEvent, p1: MotionEvent, p2: Float, p3: Float) = true;
-    override fun onLongPress(p0: MotionEvent) = Unit
-    override fun onFling(p0: MotionEvent, p1: MotionEvent, p2: Float, p3: Float) = true
-    override fun onLocationChanged(location: Location?, source: IMyLocationProvider?) = Unit
 }

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

@@ -12,4 +12,12 @@
         android:clickable="true"
         android:focusable="true" />
 
+    <ProgressBar
+        android:id="@+id/mapLoading"
+        style="?android:attr/progressBarStyleLarge"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"/>
+
 </FrameLayout>