Add dismissSnackbar method (#763)

android/app/src/main/java/com/reactnativenavigation/bridge/NavigationReactModule.java

         NavigationCommandsHandler.showSnackbar(snackbarParams);
     }
 
+    @ReactMethod
+    public void dismissSnackbar() {
+        NavigationCommandsHandler.dismissSnackbar();
+    }
+
     @ReactMethod
     public void showContextualMenu(final String screenInstanceId, final ReadableMap params, final Callback onButtonClicked) {
         ContextualMenuParams contextualMenuParams =

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationActivity.java

         layout.showSnackbar(params);
     }
 
+    public void dismissSnackbar() {
+        layout.dismissSnackbar();
+    }
+
     public void showContextualMenu(String screenInstanceId, ContextualMenuParams params, Callback onButtonClicked) {
         layout.showContextualMenu(screenInstanceId, params, onButtonClicked);
         modalController.showContextualMenu(screenInstanceId, params, onButtonClicked);

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationCommandsHandler.java

             }
         });
     }
+
+    public static void dismissSnackbar() {
+        final NavigationActivity currentActivity = NavigationActivity.currentActivity;
+        if (currentActivity == null) {
+            return;
+        }
+
+        NavigationApplication.instance.runOnMainThread(new Runnable() {
+            @Override
+            public void run() {
+                currentActivity.dismissSnackbar();
+            }
+        });
+    }
 }

android/app/src/main/java/com/reactnativenavigation/layouts/BottomTabsLayout.java

         snackbarAndFabContainer.showSnackbar(eventId, params);
     }
 
+    @Override
+    public void dismissSnackbar() {
+        snackbarAndFabContainer.dismissSnackbar();
+    }
+
     @Override
     public void showSlidingOverlay(final SlidingOverlayParams params) {
         slidingOverlaysQueue.add(new SlidingOverlay(this, params));

android/app/src/main/java/com/reactnativenavigation/layouts/Layout.java

     void dismissContextualMenu(String screenInstanceId);
 
     Screen getCurrentScreen();
+
+    void dismissSnackbar();
 }

android/app/src/main/java/com/reactnativenavigation/layouts/SingleScreenLayout.java

         snackbarAndFabContainer.showSnackbar(navigatorEventId, params);
     }
 
+    @Override
+    public void dismissSnackbar() {
+        snackbarAndFabContainer.dismissSnackbar();
+    }
+
     @Override
     public void showSlidingOverlay(final SlidingOverlayParams params) {
         slidingOverlaysQueue.add(new SlidingOverlay(this, params));

android/app/src/main/java/com/reactnativenavigation/views/SnackbarAndFabContainer.java

         updateFab(fabParams);
     }
 
-    private void dismissSnackbar() {
+    public void dismissSnackbar() {
         if (snakbar != null) {
             snakbar.dismiss();
             snakbar = null;

src/Screen.js

     return platformSpecific.showSnackbar(this, params);
   }
 
+  dismissSnackbar() {
+    return platformSpecific.dismissSnackbar();
+  }
+
   showContextualMenu(params, onButtonPressed) {
     return platformSpecific.showContextualMenu(this, params, onButtonPressed);
   }

src/deprecated/platformSpecificDeprecated.android.js

   return newPlatformSpecific.showSnackbar(adapted);
 }
 
+function dismissSnackbar() {
+  return newPlatformSpecific.dismissSnackbar();
+}
+
 function showContextualMenu(navigator, params) {
   const contextualMenu = {
     buttons: [],
   navigatorToggleTabs,
   navigatorToggleNavBar,
   showSnackbar,
+  dismissSnackbar,
   showContextualMenu,
   dismissContextualMenu
 };

src/platformSpecific.android.js

   NativeReactModule.showSnackbar(params);
 }
 
+function dismissSnackbar() {
+  NativeReactModule.dismissSnackbar();
+}
+
 function showContextualMenu(screenInstanceID, params, onButtonPressed) {
   NativeReactModule.showContextualMenu(screenInstanceID, params, onButtonPressed);
 }
   setBottomTabBadgeByNavigatorId,
   setBottomTabBadgeByIndex,
   showSnackbar,
+  dismissSnackbar,
   showContextualMenu,
   dismissContextualMenu
 };