MultiStateRefreshLayout
2016-07-26 本文已影响25人
美乃滋酱啊
android官方的SwipeRefreshlayout控件不支持上拉加载,于是修改了MultiStateView的部分代码,做为listView的footview,封装成了这个可以加载更多的控件,且footview的状态可以改变。
地址:https://github.com/fantianwen/MultiStateRefreshLayout
- 支持ListView
- 支持footView改变状态
使用方法
<van.tian.wen.multirefreshlayout.MultiStateRefreshLayout
android:id="@+id/multiRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
van:emptyView="@layout/emptylayout"
van:errorView="@layout/errorlayout"
van:listView="@layout/lv"
van:loadingView="@layout/loadinglayout"
van:successView="@layout/successlayout"
van:unknownView="@layout/unknownlayout">
</van.tian.wen.multirefreshlayout.MultiStateRefreshLayout>
代码中:
multiRefreshLayout = (MultiStateRefreshLayout) findViewById(R.id.multiRefreshLayout);
multiRefreshLayout.setColorSchemeColors(Color.GREEN);
mListView = multiRefreshLayout.getListView();
multiRefreshLayout.setListView(mListView);
myAdapter = new MyAdapter(this, mLists);
mListView.setAdapter(myAdapter);
multiRefreshLayout.setOnLoadingListener(new MultiStateRefreshLayout.OnLoadingListener() {
@Override
public void onLoadMore() {
// 加载更多
}
});
multiRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
// 刷新
}
});
multiRefreshLayout.setOnSucessFootClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 点击footView的加载加载更多
}
});
实现原理
关键代码:
public void setListView(final ListView mListView) {
this.mListView = mListView;
mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case SCROLL_STATE_FLING:
break;
case SCROLL_STATE_IDLE:
//监听是都能够上拉刷新
if (canRefresh()) {
setEnabled(true);
} else {
setEnabled(false);
}
//监听能够上拉加载更多
if (canLoadMore(scrollState)) {
loadData();
}
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
});
}
其实主要解决的问题就是SwipeRefreshLayout的下拉操作会和ListView的下拉操作相冲突,我们只要在ListView的scrollListener中进行判断:
case SCROLL_STATE_IDLE:
//监听是都能够上拉刷新
if (canRefresh()) {
setEnabled(true);
} else {
setEnabled(false);
}
//监听能够上拉加载更多
if (canLoadMore(scrollState)) {
loadData();
}
break;
其中canRefresh()
代码如下:
private boolean canRefresh() {
return isTop();
}
private boolean isTop() {
if (mListView.getCount() > 0) {
if (mListView.getFirstVisiblePosition() == 0
&& mListView.getChildAt(0).getTop() >= mListView.getTop()) {
return true;
}
}
return false;
}
不足
改变状态需要自主代码调用实现,因为SwipeRefreshLayout
不能够判断已经刷新完毕,这点比较不人性化。