我正在尝试使用support library中的recyclerview和cards。我有一个卡片列表的recyclerview。每个卡片都在右上角有一个"X"图标，可以用来删除它:
卡片的xml文件名为list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/taskDesc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:textSize="40sp"
android:text="hi"/>
<ImageView
android:id="@+id/xImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:src="@drawable/ic_remove"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
我试图使用在 TaskAdapter.java 中调用的 notifyItemRemoved(position) 的位置来标记该行：
public class TaskAdapter extends RecyclerView.Adapter<TaskAdapter.TaskViewHolder> {
private List<Task> taskList;
private TaskAdapter thisAdapter = this;
// cache of views to reduce number of findViewById calls
public static class TaskViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
protected TextView taskTV;
protected ImageView closeBtn;
public TaskViewHolder(View v) {
super(v);
taskTV = (TextView)v.findViewById(R.id.taskDesc);
}
@Override
public void onClick(View v) {
int position = v.getTag();
adapter.notifyItemRemoved(position);
}
}
public TaskAdapter(List<Task> tasks) {
if(tasks == null)
throw new IllegalArgumentException("tasks cannot be null");
taskList = tasks;
}
// onBindViewHolder binds a model to a viewholder
@Override
public void onBindViewHolder(TaskViewHolder taskViewHolder, int pos) {
final int position = pos;
Task currTask = taskList.get(pos);
taskViewHolder.taskTV.setText(currTask.getDescription());
taskViewHolder.closeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
thisAdapter.notifyItemRemoved(position);
}
});
}
@Override
public int getItemCount() {
return taskList.size();
}
// inflates row to create a viewHolder
@Override
public TaskViewHolder onCreateViewHolder(ViewGroup parent, int pos) {
View itemView = LayoutInflater.from(parent.getContext()).
inflate(R.layout.list_item, parent, false);
return new TaskViewHolder(itemView);
}
}
这行代码无法运行，因为您不能设置标签，也无法从 onClick 中访问适配器(Adapter)。