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带搜索栏的 listview，轻拉出现搜索栏，用力拉出现下拉刷新
<vivian.com.searchlistview.widget.SearchListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:background="@color/stand_backgroud"
android:cacheColorHint="#00000000"
android:drawSelectorOnTop="false"
android:listSelector="@android:color/transparent">
</vivian.com.searchlistview.widget.SearchListView>
SearchBar searchBar=new SearchBar(this);
mListView.addHeaderView(searchBar);
mListView.pullRefreshEnable(true);//下拉刷新
mListView.setAutoFetchMore(true);//自动加载更多
手动请求网络-->显示 header-->请求成功，关闭 header
mListView.setEnableRefresh(false);//设 false关闭刷新功能
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