start activity with fade animation when animationType: 'fade' is passed (#1197)

android/app/src/main/java/com/reactnativenavigation/NavigationApplication.java

 package com.reactnativenavigation;
 
 import android.app.Application;
+import android.content.Intent;
+import android.os.Bundle;
 import android.os.Handler;
 import android.support.annotation.Nullable;
+import android.support.v4.app.ActivityOptionsCompat;
 
 import com.facebook.react.ReactApplication;
 import com.facebook.react.ReactNativeHost;
         activityCallbacks = new ActivityCallbacks();
     }
 
+    @Override
+    public void startActivity(Intent intent) {
+        String animationType = intent.getStringExtra("animationType");
+        if (animationType != null && animationType.equals("fade")) {
+            Bundle bundle = ActivityOptionsCompat.makeCustomAnimation(getApplicationContext(),
+                    android.R.anim.fade_in,
+                    android.R.anim.fade_out
+            ).toBundle();
+            super.startActivity(intent, bundle);
+        } else {
+            super.startActivity(intent);
+        }
+    }
+
     public void startReactContextOnceInBackgroundAndExecuteJS() {
         reactGateway.startReactContextOnceInBackgroundAndExecuteJS();
     }

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

         IntentDataHandler.onStartApp(intent);
         intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.putExtra(ACTIVITY_PARAMS_BUNDLE, params);
+        intent.putExtra("animationType", params.getString("animationType"));
         NavigationApplication.instance.startActivity(intent);
     }