fix compiling

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

 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
-import android.util.Log;
 import android.view.KeyEvent;
 
 import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
 
     private void createLayout() {
         singleScreenLayout = new SingleScreenLayout(this, activityParams.screenParams);
-        singleScreenLayout.createLayout();
         setContentView(singleScreenLayout);
     }