Search this area buttons are added but button function does not work and button visibility is problematic

app/src/main/java/fr/free/nrw/commons/nearby/NearbyTestLayersFragment.java

@@ -14,6 +14,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.Animation;
 import android.view.animation.AnimationUtils;
+import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
@@ -136,6 +137,12 @@ public class NearbyTestLayersFragment extends CommonsDaggerSupportFragment imple
     @BindView(R.id.icon)
     ImageView icon;
 
+    @BindView(R.id.search_this_area_button)
+    Button searchThisAreaButton;
+
+    @BindView(R.id.search_this_area_button_progress_bar)
+    ProgressBar searchThisAreaButtonProgressBar;
+
     @Inject
     LocationServiceManager locationManager;
 
@@ -337,6 +344,11 @@ public class NearbyTestLayersFragment extends CommonsDaggerSupportFragment imple
 
     }
 
+    @Override
+    public void addOnCameraMoveListener(MapboxMap.OnCameraMoveListener onCameraMoveListener) {
+        mapFragment.getMapboxMap().addOnCameraMoveListener(onCameraMoveListener);
+    }
+
     @Override
     public void setListFragmentExpanded() {
 
@@ -448,17 +460,25 @@ public class NearbyTestLayersFragment extends CommonsDaggerSupportFragment imple
 
     @Override
     public void addSearchThisAreaButtonAction() {
-
+        searchThisAreaButton.setOnClickListener(nearbyParentFragmentPresenter.onSearchThisAreaClicked());
     }
 
     @Override
     public void setSearchThisAreaButtonVisibility(boolean isVisible) {
-
+        if (isVisible) {
+            searchThisAreaButton.setVisibility(View.VISIBLE);
+        } else {
+            searchThisAreaButton.setVisibility(View.GONE);
+        }
     }
 
     @Override
     public void setSearchThisAreaProgressVisibility(boolean isVisible) {
-
+        if (isVisible) {
+            searchThisAreaButtonProgressBar.setVisibility(View.VISIBLE);
+        } else {
+            searchThisAreaButtonProgressBar.setVisibility(View.GONE);
+        }
     }
 
     @Override

app/src/main/java/fr/free/nrw/commons/nearby/SupportMapFragment.java

@@ -461,7 +461,8 @@ public class SupportMapFragment extends CommonsDaggerSupportFragment
 
     @Override
     public LatLng getCameraTarget() {
-        return null;
+        return LocationUtils
+                .mapBoxLatLngToCommonsLatLng(mapboxMap.getCameraPosition().target);
     }
 
     @Override

app/src/main/java/fr/free/nrw/commons/nearby/mvp/contract/NearbyParentFragmentContract.java

@@ -20,9 +20,7 @@ public interface NearbyParentFragmentContract {
         void listOptionMenuItemClicked();
         void  populatePlaces(LatLng curlatLng, LatLng searchLatLng);
         boolean isBottomSheetExpanded();
-        void addSearchThisAreaButtonAction();
+
-        void setSearchThisAreaButtonVisibility(boolean isVisible);
-        void setSearchThisAreaProgressVisibility(boolean isVisible);
         void checkPermissionsAndPerformAction(Runnable runnable);
         void resumeFragment();
         void displayLoginSkippedWarning();
@@ -33,6 +31,11 @@ public interface NearbyParentFragmentContract {
         void initViewPositions();
         void hideBottomSheet();
         void displayBottomSheetWithInfo(Marker marker);
+
+        void addOnCameraMoveListener(MapboxMap.OnCameraMoveListener onCameraMoveListener);
+        void addSearchThisAreaButtonAction();
+        void setSearchThisAreaButtonVisibility(boolean isVisible);
+        void setSearchThisAreaProgressVisibility(boolean isVisible);
     }
 
     interface UserActions {
@@ -43,6 +46,8 @@ public interface NearbyParentFragmentContract {
         void lockNearby(boolean isNearbyLocked);
         MapboxMap.OnCameraMoveListener onCameraMove(MapboxMap mapboxMap);
         void setActionListeners(JsonKvStore applicationKvStore);
+
+        MapboxMap.OnCameraMoveListener onCameraMove(LatLng cameraTarget);
     }
     
     interface ViewsAreReadyCallback {

app/src/main/java/fr/free/nrw/commons/nearby/mvp/fragments/NearbyParentFragment.java

@@ -365,6 +365,11 @@ public class NearbyParentFragment extends CommonsDaggerSupportFragment
 
     }
 
+    @Override
+    public void addOnCameraMoveListener(MapboxMap.OnCameraMoveListener onCameraMoveListener) {
+
+    }
+
     @Override
     public boolean isNetworkConnectionEstablished() {
         return NetworkUtils.isInternetConnectionEstablished(getActivity());

app/src/main/java/fr/free/nrw/commons/nearby/mvp/presenter/NearbyParentFragmentPresenter.java

@@ -118,6 +118,8 @@ public class NearbyParentFragmentPresenter
         //nearbyParentFragmentView.addNetworkBroadcastReceiver();
         //nearbyMapFragmentView.setupMapView(null);
         //nearbyOperationsInitialized();
+        this.nearbyParentFragmentView.addSearchThisAreaButtonAction();
+        this.nearbyParentFragmentView.addOnCameraMoveListener(onCameraMove(getCameraTarget()));
         initializeMapOperations();
     }
 
@@ -175,6 +177,21 @@ public class NearbyParentFragmentPresenter
 
     }
 
+    public MapboxMap.OnCameraMoveListener onCameraMove(LatLng cameraTarget) {
+
+        return new MapboxMap.OnCameraMoveListener() {
+            @Override
+            public void onCameraMove() {
+                // If our nearby markers are calculated at least once
+                if (NearbyController.currentLocation != null) {
+                    if (nearbyParentFragmentView.isNetworkConnectionEstablished()) {
+                        nearbyParentFragmentView.setSearchThisAreaButtonVisibility(true);
+                    }
+                }
+            }
+        };
+    }
+
     public void markerUnselected() {
         nearbyParentFragmentView.hideBottomSheet();
     }