Android水滴屏全屏隐藏状态栏

    public  void hideStatusBar(Activity activity) {
        if (activity == null) return;
        Window window = activity.getWindow();
        if (window == null) return;
        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
        WindowManager.LayoutParams lp = window.getAttributes();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            lp.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
        }
        window.setAttributes(lp);
    }

在Activity的setContentView之前调用。