You can set the background image to an activity by setting android:background xml attributes as followings: (Here, for example, Take a LinearLayout for an activity and setting a background image for the layout(i.e. indirectly to an activity)).
Mobdro is 100% legal in USA. You donât need to worry about it. Up to now, there is no legal issues regarding Mobdro application. Mobdro streaming application is quite familiar to UK and US people.
Yes Streaming is legal in the EU! If we take a look at the law on streaming as it stands 2016 you can stream content from an online source as long as you donât download and save the media. When you stream content with Kodi its not downloading and saving the media onto your device but streaming it through Kodi.