SwipeRefreshLayout是android官方的下拉刷新控件;
它内部有且只能有一个子控件;
当一个ListView嵌入到它内部时,就不能为ListView带一个EmptyView了;
于是很自然的想到将ListView和EmptyView纳入到一个父控件中;
典型的像下面这样的布局:
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:cacheColorHint="@android:color/transparent"
android:divider="@color/text_color_c4"
android:dividerHeight="@dimen/line_width"
android:footerDividersEnabled="true" />
<include
android:id="@+id/emptyView"
layout="@layout/empty_view_for_tang_friend_0" />
</FrameLayout>
</android.support.v4.widget.SwipeRefreshLayout>
这样就可以实现ListView和EmptyView都下拉刷新了;
但是问题来了,当ListView的数据超过一屏的时候,再往上滑,滑不上去了;
这就是SwipeRefreshLayout和ListView的EmptyView共存冲突的问题(如果SwipeRefreshLayout中仅有一个ListView的话没问题,但现在多了一个EmptyView);
解决办法有是有,虽然不那么优雅:
swipeRefreshLayout = (android.support.v4.widget.SwipeRefreshLayout) v.findViewById(R.id.swipeRefreshLayout);
swipeRefreshLayout.setColorSchemeResources(R.color.text_color_c6, R.color.yellow, R.color.grey, R.color.red);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener()
{
@Override
public void onRefresh()
{
// TODO Auto-generated method stub
//dosomething
}
});
listView = (ListView) v.findViewById(R.id.listView);
listView.setOnScrollListener(new AbsListView.OnScrollListener()
{
@Override
public void onScrollStateChanged(AbsListView absListView, int i)
{
}
@Override
public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (firstVisibleItem == 0)
swipeRefreshLayout.setEnabled(true);
else
swipeRefreshLayout.setEnabled(false);
}
});
在ListView滑动的时候做一个判断,看看是不是滑动到顶部了,到顶部了就swipeRefreshLayout.setEnabled(true);让SwipeRefreshLayout可以接受动作,这样就ok了。
上面的解决方案比较简单,但是有个小问题,就是当listView滑动到第一个Item(让第一个Item显示一半)的时候,再上滑就上不去了,始终显示半个Item。
为了解决这个问题,只能使用笨办法了:将ListView和EmptyView分离,让他们两个分别被两个SwipeRefreshLayout包裹,如下面的布局:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<cn.tangdada.tangbang.widget.LoadMoreListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:cacheColorHint="@android:color/transparent"
android:divider="@color/text_color_c4"
android:dividerHeight="@dimen/line_width"
android:footerDividersEnabled="false" />
</android.support.v4.widget.SwipeRefreshLayout>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayoutEmptyView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:paddingLeft="32dp"
android:paddingRight="32dp"
android:text="@string/empty"
android:textColor="@color/text_color_c3"
android:textSize="@dimen/font_big" />
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>
然后需要在代码中控制显示EmptyView的时机,比如我这里的:
private void updateViews(Object obj)
{
ArrayList<User> list = (ArrayList<User>) obj;
if (list.size() == 0)
{
//listView.removeLoadMoreListener();
}
users.addAll(list);
if (users.size() == 0)
{
swipeRefreshLayout.setVisibility(View.GONE);
swipeRefreshLayout.setRefreshing(false);
swipeRefreshLayoutEmptyView.setVisibility(View.VISIBLE);
swipeRefreshLayoutEmptyView.setRefreshing(false);
}
else
{
//listView.onLoadMoreComplete();
swipeRefreshLayout.setVisibility(View.VISIBLE);
swipeRefreshLayout.setRefreshing(false);
swipeRefreshLayoutEmptyView.setVisibility(View.GONE);
swipeRefreshLayoutEmptyView.setRefreshing(false);
}
notifyDataSetChanged();
}
SwipeRefreshLayout完美添加及完善上拉加载功能
android-Ultra-Pull-To-Refresh 源码解析
http://www.open-open.com/lib/view/open1436405920005.html