已适配Androidx，需要切到androidx分支即可
一种新的解决思路，对比我之前写的PinnedSectionItemDecoration有如下好处：
- 粘性头部是放置在RecyclerView外面的View，对比之前绘制出来的粘性头部，能显示出点击的效果，并且处理点击事件更加简单
- 不需要频繁的创建粘性头部的View用于绘制，只需要刷新外置的粘性头部的数据即可
StickyHeadContainer用来承载粘性头部布局，并且需要和RecyclerView的顶部对齐
<RelativeLayout
android:id="@+id/content_main"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.oubowu.stickydemo.MainActivity"
tools:showIn="@layout/activity_main">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_margin="10dp"
tools:background="@color/colorAccent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</android.support.v7.widget.RecyclerView>
<com.oubowu.stickyitemdecoration.StickyHeadContainer
android:id="@+id/shc"
android:layout_width="match_parent"
android:layout_margin="10dp"
android:layout_height="wrap_content">
<include
layout="@layout/item_stock_sticky_head"/>
</com.oubowu.stickyitemdecoration.StickyHeadContainer>
</RelativeLayout>
RecyclerView只需要添加一个StickyItemDecoration即可实现粘性头部，需要传入StickyHeadContainer用于头部的处理，以及粘性头部的类型；然后头部的点击处理就像平常一样处理
final StickyHeadContainer container = (StickyHeadContainer) findViewById(R.id.shc);
final TextView tvStockName = (TextView) container.findViewById(R.id.tv_stock_name);
final CheckBox checkBox = (CheckBox) container.findViewById(R.id.checkbox);
final ImageView more = (ImageView) container.findViewById(R.id.iv_more);
checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mAdapter.getData().get(mStickyPosition).getData().check = isChecked;
mAdapter.notifyItemChanged(mStickyPosition);
}
});
container.setDataCallback(new StickyHeadContainer.DataCallback() {
@Override
public void onDataChange(int pos) {
mStickyPosition = pos;
StockEntity.StockInfo item = mAdapter.getData().get(pos).getData();
tvStockName.setText(item.stickyHeadName);
checkBox.setChecked(item.check);
}
});
more.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "点击了粘性头部的更多", Toast.LENGTH_SHORT).show();
}
});
container.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "点击了粘性头部：" + tvStockName.getText(), Toast.LENGTH_SHORT).show();
}
});
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false));
mRecyclerView.addItemDecoration(new StickyItemDecoration(container, RecyclerViewAdapter.TYPE_STICKY_HEAD));
mRecyclerView.addItemDecoration(new SpaceItemDecoration(mRecyclerView.getContext()));
Adapter需要重写这两个方法，用于处理GridLayoutManager和StaggeredGridLayoutManager模式下的头部使之占满一行
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
FullSpanUtil.onAttachedToRecyclerView(recyclerView, this, TYPE_STICKY_HEAD);
}
@Override
public void onViewAttachedToWindow(RecyclerViewHolder holder) {
super.onViewAttachedToWindow(holder);
FullSpanUtil.onViewAttachedToWindow(holder, this, TYPE_STICKY_HEAD);
}
PS:若是使用了下拉刷新的控件配合RecyclerView使用的话(显示刷新头部并且RecyclerView跟随头部的显示往下移动那种类型)，因为StickyHeadContainer是独立于RecyclerView存在的，不能跟随RecyclerView移动，需要根据刷新头部的显示情况设置StickyHeadContainer的可见性
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