Send accept and cancel LeftButton events

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

 
     private static final String KEY_EVENT_ID = "id";
     private static final String KEY_EVENT_TYPE = "type";
+    private static final String KEY_NAVIGATOR_EVENT_ID = "navigatorEventID";
     private static final String EVENT_TYPE = "NavBarButtonPress";
     private RCTDeviceEventEmitter eventEmitter;
 
         WritableMap params = Arguments.createMap();
         params.putString(KEY_EVENT_TYPE, EVENT_TYPE);
         params.putString(KEY_EVENT_ID, eventId);
-        params.putString("navigatorEventID", navigatorEventId);
+        params.putString(KEY_NAVIGATOR_EVENT_ID, navigatorEventId);
         eventEmitter.emit(navigatorEventId, params);
     }
 }

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

 import android.view.View;
 
 import com.balysv.materialmenu.MaterialMenuDrawable;
+import com.reactnativenavigation.NavigationApplication;
 import com.reactnativenavigation.params.TitleBarButtonParams;
 import com.reactnativenavigation.params.TitleBarLeftButtonParams;
 
         setInitialState();
     }
 
-    private void setInitialState() {
-        if (params != null) {
-            setIconState(params.iconState);
-        } else {
-            setVisible(false);
+    public void setIconState(TitleBarLeftButtonParams params) {
+        this.params = params;
+        if (params.color.hasColor()) {
+            setColor(params.color.getColor());
         }
+        animateIconState(params.iconState);
     }
 
     @Override
     public void onClick(View v) {
         if (isBackButton()) {
             titleBarBackButtonListener.onTitleBarBackPress();
+        } else {
+            sendClickEvent();
+        }
+    }
+
+    private void setInitialState() {
+        if (params != null) {
+            setIconState(params.iconState);
+        } else {
+            setVisible(false);
         }
     }
 
     private boolean isBackButton() {
         return getIconState() == IconState.ARROW;
     }
+
+    private void sendClickEvent() {
+        NavigationApplication.instance.sendEvent(params.eventId, navigatorEventId);
+    }
 }

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

         if (leftButton == null) {
             createAndSetLeftButton(leftButtonParams, titleBarBackButtonListener, navigatorEventId);
         } else {
-            leftButton.animateIconState(leftButtonParams.iconState);
+            leftButton.setIconState(leftButtonParams);
         }
     }