对话框窗口在默认情况下是可聚焦的，可聚焦的窗口导致从全屏模式退出。
对于解决方法，您可以尝试设置 FLAG_NOT_FOCUSABLE 按此处所述标记对话框，但请注意，系统对话框（如anr）仍将导致退出。

根据中的答案共享我的解决方案link@ceribadev共享：

@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
    Dialog dialog = super.onCreateDialog(savedInstanceState);

    // Here's the magic..
    try {
        // Set the dialog to not focusable (makes navigation ignore us adding the window)
        dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

        // Show the dialog!
        dialog.setOnShowListener(dialogInterface -> {
            // Set the dialog to immersive
            dialog.getWindow().getDecorView().setSystemUiVisibility(dialog.getOwnerActivity().getWindow().getDecorView().getSystemUiVisibility());

            // Clear the not focusable flag from the window
            dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
        });
    } catch (Exception e) {
        e.printStackTrace();
    }

    return dialog;
}