When building a video-streaming navigation application, you can choose to create a custom menu using your own UI or use the built-in SDL menu system. The SDL menu allows you to display a menu structure so users can select menu options or submenus. For more information about the SDL menu system, see menus. It's recommended to use the built-in SDL menu system to have better performance, automatic driver distraction support - such as list limitations and text sizing, and more.
To open the SDL built-in menu from your video streaming UI, see 'Opening the Built-In Menu' below.
The Show Menu RPC allows you to open the menu programmatically. That way, you can open the menu from your own UI.
To show the top level menu use
You can also open the menu directly to a sub-menu. This is further down the tree than the top-level menu. To open a sub-menu, pass a cell that contains sub-cells. If the cell has no sub-cells the method call will fail.
The sub-cell you use in
openSubMenu must be included in
sdlManager.screenManager.menu array. If it is not included in the array, the method call will fail.
If you choose to not use the built-in SDL menu system and instead want to use your own menu UI, you need to have a way for users to close your application. This should be done through a menu option in your UI that sends the
This RPC is unnecessary if you are using
OpenMenu because OEMs will take care of providing a close button into your menu themselves.
CloseApplication closeApplication = new CloseApplication(); sdlManager.sendRPC(closeApplication);