Determine whether the current screen is the main screen or the secondary screen on the Android car

You can use one of the following methods to determine whether the current screen is the main screen or the secondary screen on the Android car:

1. Use the DisplayManager API: You can use the DisplayManager API to get all the displays connected to the car and determine their types (main screen or secondary screen). Here is a sample code:

   DisplayManager displayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE);
   Display[] displays = displayManager.getDisplays();
   for (Display display : displays) {
       if (display.getDisplayId() == Display.DEFAULT_DISPLAY) {
           // 这是主屏
       } else {
           // 这是副屏
       }
   }
   

   In the above example, getDisplays()the method returns an array of displays, including primary and secondary. By judging getDisplayId()whether it is equal to Display.DEFAULT_DISPLAY, it can be distinguished as the main screen or the secondary screen.

2. Use WindowManager API: You can use WindowManager API to obtain the display screen where the current window is located, and determine whether it is the main screen or the secondary screen. Here is a sample code:

   WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
   Display display = windowManager.getDefaultDisplay();
   if (display.getDisplayId() == Display.DEFAULT_DISPLAY) {
       // 这是主屏
   } else {
       // 这是副屏
   }
   

   In the above example, getDefaultDisplay()the method returns the display on which the current window resides. By judging getDisplayId()whether it is equal to Display.DEFAULT_DISPLAY, it can be distinguished as the main screen or the secondary screen.

   It should be noted that different in-vehicle equipment may have different display management aspects, so adaptation and adjustment may be required according to specific conditions in actual applications.