应用的全屏和非全屏

    /**
     * 全屏显示
     */
    private void setFullSreen() {
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
        getWindow().setAttributes(params);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
        //getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN); // Activity全屏显示，且状态栏被覆盖掉
    }

    /**
     * 退出全屏
     */
    private void exitFullSreen() {
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.flags &= (~WindowManager.LayoutParams.FLAG_FULLSCREEN);
        getWindow().setAttributes(params);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
        //getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN); // Activity全屏显示，但是状态栏不会被覆盖掉，而是正常显示，只是Activity顶端布局会被覆盖住
    }