initial commit for AppLayout

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

@@ -8,7 +8,7 @@ import android.view.KeyEvent;
 
 import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
 import com.reactnativenavigation.NavigationApplication;
-import com.reactnativenavigation.layouts.ScreenLayout;
+import com.reactnativenavigation.layouts.SingleScreenLayout;
 import com.reactnativenavigation.params.ActivityParams;
 import com.reactnativenavigation.params.parsers.ActivityParamsParser;
 import com.reactnativenavigation.react.JsDevReloadHandler;
@@ -42,8 +42,9 @@ public class NavigationActivity extends AppCompatActivity implements DefaultHard
     }
 
     private void createLayout() {
-        ScreenLayout screenLayout = new ScreenLayout(this, activityParams.screenParams);
-        setContentView(screenLayout);
+        SingleScreenLayout singleScreenLayout = new SingleScreenLayout(this, activityParams.screenParams);
+        singleScreenLayout.createLayout();
+        setContentView(singleScreenLayout);
     }
 
     @Override

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

@@ -0,0 +1,21 @@
+package com.reactnativenavigation.layouts;
+
+import android.content.Context;
+import android.widget.FrameLayout;
+
+import com.reactnativenavigation.params.ScreenParams;
+
+public class SingleScreenLayout extends FrameLayout {
+
+    private final ScreenParams screenParams;
+
+    public SingleScreenLayout(Context context, ScreenParams screenParams) {
+        super(context);
+        this.screenParams = screenParams;
+    }
+
+    public void createLayout() {
+        ScreenLayout screenLayout = new ScreenLayout(getContext(), screenParams);
+        addView(screenLayout);
+    }
+}