Android ActionBar hide/show when scrolling list vi

问题:

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;
            }
        });
    }

回答1:

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.

回答2:

You need to make the action bar overlays the listview. By doing this you have the responsibility to manage of hiding and showing the action bar when necessary.

There is an example at the following page: http://www.techrepublic.com/article/pro-tip-maximize-android-screen-real-estate-by-showing-and-hiding-the-action-bar/

回答3:

you could try this library. Hope it helps https://github.com/ksoichiro/Android-ObservableScrollView

回答4:

See my answer on that link: How to hide and show the Android ActionBar like in Google Inbox app? I am using RecyclerView but the idea is the same