Modify iOS and Android App

Modify iOS and Android app and put in App store and Google Play I have an existing iOS and Android app. The iOS app is for iPhone and iPad (not wearable); while the Android app is for all Android devices (not wearable). Currently, both software use a webview to display content from a remote site; if a certain token is not seen in the url, then a native from is shown where the user has to enter a 16 digit registration key -- once the key is entered, then it will display the designated web content. What I want to change ------------------------------------ 1. Change the background image of the app (currently water droplets) 2. A native device icon appears above the top right section of the webview. Update that icon to receive JSON. If no JSON is received, or if it is empty, hide the icon. If it receives objects, they will determine what links will appear below the icon when the icon is clicked. The links should be native device and allow user to set new URL for the webview. 3. Put a loading icon, which I will provide in the center-middle of the webview. When the app is started, and the webview is still loading its content, this icon should remain visible. 4. Remove the old app registration page where the user enters hexadecimal characters inside fields.