Add a splash screen for Android app

[mcicolella]

We can take inspiration from our Java client splash screen.

[hackertronix]

I'm on it 👍

[paulnunezm]

Hi,

I created a pull request for this in which no timer is used to display or hide the splash screen.

[mcicolella]

@paulnunezm I integrated your PR to update the codebase. Now the project compiles. But I'd change a bit the splash login.

[paulnunezm]

@mcicolella Tell me how to see if I can do it.

[mcicolella]

@paulnunezm the idea is having a centered logo (in attachment) and two rows with the text "Open IoT Framework" and "THING WIDER" (in red)

[paulnunezm]

@mcicolella I used the image you send before, I also remove the background and save it as a PNG to be able to use in a background of any color:

If it doesn't show is because the app is loading too fast as it doesn't have anything to load. Once you have to load something the splash will show until the app is ready to show what's on the activity.