Fix initial region android (react-native-maps#1563)

* Fix initial region on android

* Fix initial region for android

Author: foyarash

lib/android/src/main/java/com/airbnb/android/react/maps/AirMapManager.java

@@ -75,6 +75,11 @@ public void setRegion(AirMapView view, ReadableMap region) {
     view.setRegion(region);
   }
 
+  @ReactProp(name = "initialRegion")
+  public void setInitialRegion(AirMapView view, ReadableMap initialRegion) {
+    view.setInitialRegion(initialRegion);
+  }
+
   @ReactProp(name = "mapType")
   public void setMapType(AirMapView view, @Nullable String mapType) {
     int typeId = MAP_TYPES.get(mapType);

lib/android/src/main/java/com/airbnb/android/react/maps/AirMapView.java

@@ -70,6 +70,7 @@ public class AirMapView extends MapView implements GoogleMap.InfoWindowAdapter,
   private boolean handlePanDrag = false;
   private boolean moveOnMarkerPress = true;
   private boolean cacheEnabled = false;
+  private boolean initialRegionSet = false;
 
   private static final String[] PERMISSIONS = new String[]{
       "android.permission.ACCESS_FINE_LOCATION", "android.permission.ACCESS_COARSE_LOCATION"};
@@ -360,6 +361,13 @@ public synchronized void doDestroy() {
     onDestroy();
   }
 
+  public void setInitialRegion(ReadableMap initialRegion) {
+    if (!initialRegionSet && initialRegion != null) {
+      setRegion(initialRegion);
+      initialRegionSet = true;
+    }
+  }
+
   public void setRegion(ReadableMap region) {
     if (region == null) return;
 
@@ -733,7 +741,7 @@ public void run() {
           eventDispatcher.dispatchEvent(new RegionChangeEvent(getId(), bounds, center, true));
         }
       }
-      
+
       timerHandler.postDelayed(this, 100);
     }
   };

lib/components/MapView.js

@@ -462,10 +462,13 @@ class MapView extends React.Component {
     const { layout } = e.nativeEvent;
     if (!layout.width || !layout.height) return;
     if (this.state.isReady && !this.__layoutCalled) {
-      const region = this.props.region || this.props.initialRegion;
+      const { region, initialRegion } = this.props;
       if (region) {
         this.__layoutCalled = true;
         this.map.setNativeProps({ region });
+      } else if (initialRegion) {
+        this.__layoutCalled = true;
+        this.map.setNativeProps({ initialRegion });
       }
     }
     if (this.props.onLayout) {