Add map option to show moving stations only

Author: sh123

codec2talkie/src/main/java/com/radio/codec2talkie/maps/MapActivity.java

@@ -133,13 +133,22 @@ public boolean onOptionsItemSelected(MenuItem item) {
             boolean showCircles = false;
             if (item.isChecked()) {
                 item.setChecked(false);
-                _mapView.setMapOrientation(0);
             } else {
                 item.setChecked(true);
                 showCircles = true;
             }
             _mapStations.showRangeCircles(showCircles);
             return true;
+        } else if (itemId == R.id.map_menu_show_moving) {
+            boolean showMoving = false;
+            if (item.isChecked()) {
+                item.setChecked(false);
+            } else {
+                item.setChecked(true);
+                showMoving = true;
+            }
+            _mapStations.showMovingStations(showMoving);
+            return true;
         }
         return super.onOptionsItemSelected(item);
     }

codec2talkie/src/main/java/com/radio/codec2talkie/maps/MapStations.java

@@ -12,6 +12,7 @@
 import android.util.Log;
 
 import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelStoreOwner;
 
@@ -32,6 +33,7 @@
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Locale;
 
 public class MapStations {
@@ -47,10 +49,14 @@ public class MapStations {
 
     private final MarkerInfoWindow _infoWindow;
 
+    private LiveData<List<StationItem>> _stationItemLiveData;
+    private final StationItemViewModel _stationItemViewModel;
+
     private final HashMap<String, Marker> _objectOverlayItems = new HashMap<>();
     private final HashMap<String, Polygon> _objectOverlayRangeCircles = new HashMap<>();
 
     private boolean _showCircles = false;
+    private boolean _showMoving = false;
 
     private final MapTrack _activeTrack;
 
@@ -64,9 +70,17 @@ public MapStations(Context context, MapView mapView, ViewModelStoreOwner owner)
         _infoWindow = new MarkerInfoWindow(R.layout.bonuspack_bubble, _mapView);
         _activeTrack = new MapTrack(_context, _mapView, _owner);
 
-        StationItemViewModel _stationItemViewModel = new ViewModelProvider(_owner).get(StationItemViewModel.class);
+        _stationItemViewModel = new ViewModelProvider(_owner).get(StationItemViewModel.class);
+        loadStations(_showMoving);
+    }
+
+    private void loadStations(boolean movingOnly) {
+        if (_stationItemLiveData != null)
+            _stationItemLiveData.removeObservers((LifecycleOwner) _owner);
+        removePositionMarkers();
+        _stationItemLiveData = _stationItemViewModel.getAllStationItems(movingOnly);
         // FIXME, room livedata sends all list if one item changed event with distinctUntilChanged
-        _stationItemViewModel.getAllStationItems().observe((LifecycleOwner) _owner, allStations -> {
+        _stationItemLiveData.observe((LifecycleOwner) _owner, allStations -> {
             Log.i(TAG, "add stations " + allStations.size());
             for (StationItem station : allStations) {
                 //Log.i(TAG, "new position " + station.getLatitude() + " " + station.getLongitude());
@@ -79,6 +93,22 @@ public MapStations(Context context, MapView mapView, ViewModelStoreOwner owner)
         });
     }
 
+    private void removePositionMarkers() {
+        for (Marker marker : _objectOverlayItems.values()) {
+            marker.remove(_mapView);
+        }
+        _objectOverlayItems.clear();
+        for (Polygon circle : _objectOverlayRangeCircles.values()) {
+            _mapView.getOverlays().remove(circle);
+        }
+        _objectOverlayRangeCircles.clear();
+    }
+
+    public void showMovingStations(boolean isMoving) {
+        _showMoving = isMoving;
+        loadStations(_showMoving);
+    }
+
     public void showRangeCircles(boolean isVisible) {
         _showCircles = isVisible;
         for (Polygon polygon : _objectOverlayRangeCircles.values()) {

codec2talkie/src/main/java/com/radio/codec2talkie/storage/log/LogItemActivity.java

@@ -85,7 +85,7 @@ protected void onCreate(Bundle savedInstanceState) {
         stationsRecyclerView.setLayoutManager(linearLayoutManagerStations);
         stationsRecyclerView.addItemDecoration(new DividerItemDecoration(stationsRecyclerView.getContext(), DividerItemDecoration.VERTICAL));
 
-        _stationItemViewModel.getAllStationItems().observe(this, stationsAdapter::submitList);
+        _stationItemViewModel.getAllStationItems(false).observe(this, stationsAdapter::submitList);
 
         // launch with filter if station name is provided
         if (_stationName == null) {

codec2talkie/src/main/java/com/radio/codec2talkie/storage/station/StationItemDao.java

@@ -43,6 +43,11 @@ public void upsertStationItem(StationItem stationItem) {
     @Query("SELECT * FROM StationItem ORDER BY srcCallsign ASC")
     public abstract LiveData<List<StationItem>> getAllStationItems();
 
+    @Query("SELECT *, (SELECT count(*) FROM PositionItem pos WHERE st.srcCallsign = pos.srcCallsign) AS positionCount " +
+            "FROM StationItem st " +
+            "WHERE positionCount > :minCount")
+    public abstract LiveData<List<StationItem>> getMovingStationItems(int minCount);
+
     @Query("DELETE FROM StationItem WHERE srcCallsign = :srcCallsign")
     public abstract void deleteStationItemsFromCallsign(String srcCallsign);
 

codec2talkie/src/main/java/com/radio/codec2talkie/storage/station/StationItemRepository.java

@@ -15,16 +15,22 @@
 public class StationItemRepository {
     private static final String TAG = StationItemRepository.class.getSimpleName();
 
+    private static final int MIN_POSITION_COUNT = 2;
+
     private final StationItemDao _stationItemDao;
     private final LiveData<List<StationItem>> _stationItems;
+    private final LiveData<List<StationItem>> _stationItemsMoving;
 
     public StationItemRepository(Application application) {
         AppDatabase appDatabase = AppDatabase.getDatabase(application);
         _stationItemDao = appDatabase.stationitemDao();
         _stationItems = Transformations.distinctUntilChanged(_stationItemDao.getAllStationItems());
+        _stationItemsMoving = Transformations.distinctUntilChanged(_stationItemDao.getMovingStationItems(MIN_POSITION_COUNT));
     }
 
-    public LiveData<List<StationItem>> getAllStationItems() { return _stationItems; }
+    public LiveData<List<StationItem>> getAllStationItems(boolean movingOnly) {
+        return movingOnly ? _stationItemsMoving : _stationItems;
+    }
 
     public void upsertStationItem(StationItem stationItem) {
         AppDatabase.getDatabaseExecutor().execute(() -> {

codec2talkie/src/main/java/com/radio/codec2talkie/storage/station/StationItemViewModel.java

@@ -19,7 +19,7 @@ public StationItemViewModel(@NonNull Application application) {
         _stationItemRepository = new StationItemRepository(application);
     }
 
-    public LiveData<List<StationItem>> getAllStationItems() { return _stationItemRepository.getAllStationItems(); }
+    public LiveData<List<StationItem>> getAllStationItems(boolean movingOnly) { return _stationItemRepository.getAllStationItems(movingOnly); }
 
     public void deleteStationItems(String srcCallsign, int hours) {
         _stationItemRepository.deleteStationItems(srcCallsign, hours);

codec2talkie/src/main/res/menu/map_menu.xml

@@ -10,6 +10,11 @@
         android:title="@string/map_menu_show_range"
         android:checkable="true"
         android:checked="false"/>
+    <item
+        android:id="@+id/map_menu_show_moving"
+        android:title="@string/map_menu_show_moving"
+        android:checkable="true"
+        android:checked="false"/>
     <item
         android:id="@+id/map_menu_clear_cache"
         android:title="@string/map_menu_clear_cache_title" />

codec2talkie/src/main/res/values/strings.xml

@@ -365,4 +365,5 @@
     <string name="log_item_activity_delete_hours_title">This will remove everything older than %d hours. Are you sure?</string>
     <string name="map_menu_rotate_map">Rotate map with compass</string>
     <string name="map_menu_show_range">Show range circles</string>
+    <string name="map_menu_show_moving">Show moving stations</string>
 </resources>