处理RecyclerView的条目点击和多选

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="1dp">

<ImageView android:id="@+id/adapter_image_imageview"
android:contentDescription="@null"
android:layout_width="match_parent"
android:layout_height=" match_parent"
android:scaleType="centerCrop"/>

<CheckBox android:id="@+id/adapter_image_checkbox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#80000000"
android:maxLines="1"
android:ellipsize="end"/>
</RelativeLayout>

Adapter的显示数据

static class ItemData {
int id;
String type;
String title;
boolean selected;

ItemData(int id, String type, String title, boolean selected) {
this.id = id;
this.type = type;
this.title = title;
this.selected = selected;
}
}

onBindViewHolder里根据Item的selected数据设置CheckBox。设置点击侦听，CheckBox状态发生变化则更新该Item的显示数据selected值。

@Override
public void onBindViewHolder(final ItemView holder, final int position) {
ItemData data = refData.get(position);
int id = data.id;
String title = data.title;
boolean selected = data.selected;

holder.checkbox.setText(title);
holder.checkbox.setOnCheckedChangeListener(null);
holder.checkbox.setChecked(selected);
holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//int position = holder.getAdapterPosition();
refData.get(position).selected = isChecked;
}
});

适配器方法public void onBindViewHolder(AdapterImageAsync.ItemView holder, int position) 的文档说明：

Called by RecyclerView to display the data at the specified position. This method should update the contents of the ViewHolder to reflect the item at the given position.

Note that unlike ListView, RecyclerView will not call this method again if the position of the item changes in the data set unless the item itself is invalidated or the new position cannot be determined. For this reason, you should only use the position parameter while acquiring the related data item inside this method and should not keep a copy of it. If you need the position of an item later on (e.g. in a click listener), use ViewHolder.getAdapterPosition() which will have the updated adapter position.

文档的Note说：

与ListView不同，如果Item的位置在数据集中变化，RecyclerView将不会再次调用此方法，除非Item本身无效或新位置无法确定。 因此，只能在此方法中的获取相关数据时使用position参数，并且不应保留其副本。 如果稍后需要某个Item的位置（例如在点击监听器中），使用具有更新的适配器位置的ViewHolder.getAdapterPosition（）。

holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int data_position = holder.getAdapterPosition();
refData.get(data_position).selected = isChecked;
}
});