Android的动作条隐藏/显示滚动列表视图时 [英] Android ActionBar hide/show when scrolling list view

问题描述

我想隐藏/显示兼容性操作栏为用户滚动向上/向下列表视图。当动作栏消失的名单也占据了操作栏的空间。

我已经按照一种方法，但它会产生一个丑陋的闪烁。有没有人有这个问题妥善解决？所需的行为就像在Google+应用隐藏/显示机制（我没兴趣对页脚）。

我已经试过低于psented $ P $：

 布尔tabletSize = getResources（）getBoolean（R.bool.isTablet）。
    如果（！tabletSize）{
        最后动作条的ActionBar =（（ActionBarActivity）getActivity（））getSupportActionBar（）。
        lvNews.setOnScrollListener（新AbsListView.OnScrollListener（）{
            私人诠释mLastFirstVisibleItem;

            @覆盖
            公共无效onScrollStateChanged（AbsListView观点，诠释scrollState）{
            }

            @覆盖
            公共无效onScroll（AbsListView观点，诠释firstVisibleItem，
                                 INT visibleItemCount，诠释totalItemCount）{

                如果（mLastFirstVisibleItem＆LT; firstVisibleItem）{
                    如果（actionBar.isShowing（））{
                        actionBar.hide（）;
                    }
                }

                如果（mLastFirstVisibleItem＆GT; firstVisibleItem）{
                    如果（！actionBar.isShowing（））{
                        actionBar.show（）;
                    }
                }
                mLastFirstVisibleItem = firstVisibleItem;
            }
        }）;
    }
 

解决方案

要避免因您可以使用覆盖属性的操作栏布局的调整闪烁。

https://developer.android.com/training/basics/actionbar/ overlaying.html

但这种方法会导致操作栏中覆盖你的ListView，所以你需要添加页眉这一尺寸：

机器人：ATTR / actionBarSize

例如：

  mVideosListView =（ListView控件）getActivity（）findViewById（android.R.id.list）。
mVideosListView.addHeaderView(getActivity().getLayoutInflater().inflate(R.layout.listview_header,null));
 

注意与其他元素，如导航抽屉这也是受此影响。

I want to hide/show the compatibility action bar as the user scrolls up/down a listview. When the action bar disappears the list will occupy also the action bar's space.

I've followed an approach but it generates an ugly flickering. Does anyone have a proper solution for this problem? The desired behaviour is like the hide/show mechanism in the Google+ app (I'm not interested about the footer).

What I've tried is presented below:

boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
    if (!tabletSize) {
        final ActionBar actionBar = ((ActionBarActivity) getActivity()).getSupportActionBar();
        lvNews.setOnScrollListener(new AbsListView.OnScrollListener() {
            private int mLastFirstVisibleItem;

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                                 int visibleItemCount, int totalItemCount) {

                if (mLastFirstVisibleItem < firstVisibleItem) {
                    if (actionBar.isShowing()) {
                        actionBar.hide();
                    }
                }

                if (mLastFirstVisibleItem > firstVisibleItem) {
                    if (!actionBar.isShowing()) {
                        actionBar.show();
                    }
                }
                mLastFirstVisibleItem = firstVisibleItem;
            }
        });
    }

解决方案

To avoid the flickering caused by the readjustment of the layout you can use the overlaying property in the action bar.

https://developer.android.com/training/basics/actionbar/overlaying.html

But this solution causes that the action bar overlays your listview, so you need to add a header with this size:

"?android:attr/actionBarSize"

for example :

mVideosListView = (ListView) getActivity().findViewById(android.R.id.list);
mVideosListView.addHeaderView(getActivity().getLayoutInflater().inflate(R.layout.listview_header,null));

Be careful with other elements like navigation drawer which is also affected by this.

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