获取列表数据并显示已经通过BaseRecyclerViewModel实现了，但是列表还不支持下拉刷新功能，所以我们还必须通过Databinding双向绑定来把ViewModel的refreshing和xml的SwipeRefreshLayout控件进行绑定。
BaseRefreshRecyclerViewModel
BaseRefreshRecyclerViewModel 其实 只需要实现OnRefreshListener 并且在onRefresh里面调用onListRefresh函数即可。 然后通过BindingConfig进行双向绑定桥接
@InverseBindingAdapter(attribute = "refreshing",event = "refreshingAttrChanged")
public static boolean isRefreshing(SwipeRefreshLayout view) {
return view.isRefreshing();
}
@BindingAdapter("refreshing")
public static void setRefreshing(SwipeRefreshLayout view, boolean refreshing) {
if (refreshing != view.isRefreshing()) {
view.setRefreshing(refreshing);
}
}
@BindingAdapter(value = {"onRefreshListener", "refreshingAttrChanged"}, requireAll = false)
public static void setOnRefreshListener(final SwipeRefreshLayout view,
final SwipeRefreshLayout.OnRefreshListener listener,
final InverseBindingListener refreshingAttrChanged) {
SwipeRefreshLayout.OnRefreshListener newValue = new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
if (listener != null) {
if (refreshingAttrChanged != null) {
refreshingAttrChanged.onChange();
}
listener.onRefresh();
}
}
};
SwipeRefreshLayout.OnRefreshListener oldValue = ListenerUtil.trackListener(view, newValue, R.id.onRefreshListener);
if (oldValue != null) {
view.setOnRefreshListener(null);
}
view.setOnRefreshListener(newValue);
}
然后跟上一章一样，写一个通过的layout 用于 include ，include_recyclerview_refresh.xml 如下：
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="viewModel"
type="com.bigkoo.mvvmframework.viewmodel.BaseRefreshRecyclerViewModel" />
<!--例子：app:adapterClassName='@{"com.bigkoo.adapter.xxxAdapter"}'-->
<variable
name="adapterClassName"
type="String"/>
<import type="me.tatarka.bindingcollectionadapter.LayoutManagers" />
</data>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:onRefreshListener="@{viewModel.onRefreshListener}"
app:refreshing="@={viewModel.refreshing}">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
app:addOnItemClick="@{viewModel.onItemClickListener}"
app:addOnScrollListener="@{viewModel.onScrollListener}"
app:itemView="@{viewModel.itemViews}"
app:items="@{viewModel.items}"
app:addItemDecoration="@{viewModel.itemDecoration}"
app:adapter='@{adapterClassName??"me.tatarka.bindingcollectionadapter.BindingRecyclerViewAdapter"}'
app:layoutManager="@{viewModel.layoutManager}" />
</android.support.v4.widget.SwipeRefreshLayout>
</layout>
使用起来和上一章一样，在具体的xml中include include_recyclerview_refresh.xml，然后ViewModel继承BaseRefreshRecyclerViewModel，即可下拉刷新。
