StatusBar显示键盘何时显示

我的活动使用了CollapsingToolbarLayout,我成功删除了StatusBar这样做:

View decorView = getWindow().getDecorView();
// Hide the status bar.
int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);

问题是,当softkeyboard弹出时,StatusBar再次出现,消耗宝贵的空间.

如何让它永久隐藏在ActivityView？

如果我将它设置为FullScreen,它可以工作,但我松了SOFT_INPUT_ADJUST_RESIZE参数.主窗口在softkeyboard显示时滚动,而不是根据需要调整大小.

更新:

代码:

 protected void onCreate(Bundle savedInstanceState) {        
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mchat);

     this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE );
..
}


@Override
protected void onResume() {
    super.onResume();

    View decorView = getWindow().getDecorView();
    // Hide the status bar.
    int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
    decorView.setSystemUiVisibility(uiOptions);
}

该活动使用NoActionBar方案(在清单上声明).