Loading Android App with in Unity3d scene instead of opening separately

I have created a unity3d android build with menu options like {settings, WhatsApp, etc} when on choose menu option it should open the respective android app within unity new scene how can I achieve this? as below reference image ![alt text][1] Note: I can achieve open android default settings and other applications from unity with the app package name. [1]: /storage/temp/196192-untitled.png