我有两个recyclerviews,我想在回收器1中单击某个项目时,将其删除并添加到回收器2中。我尝试在适配器中执行此操作,但返回null。有谁知道如何实现它?
更新1:
我的绑定方法:
public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
holder.title.setText(tasks.get(position).getTitle());
holder.description.setText(tasks.get(position).getDescription());
if(!tasks.get(position).getActive())
holder.checkBox.setChecked(true);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!holder.checkBox.isChecked()){
mainActivity.finishedItems.add(tasks.get(position));
mainActivity.items.remove(tasks.get(position));
}
else if(holder.checkBox.isChecked()){
mainActivity.items.add(tasks.get(position));
mainActivity.finishedItems.remove(tasks.get(position));
}
}
});
}
主要活动:
public ArrayList<TaskModel> items;
public ArrayList<TaskModel> finishedItems;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
items = new ArrayList<>();
finishedItems = new ArrayList<>();
RecyclerViewAdapter RecyclerViewAdapter = new RecyclerViewAdapter(this,items);
listView.setLayoutManager(new LinearLayoutManager(this));
listView.setAdapter(RecyclerViewAdapter);
ps:我的数组列表中有项目,它们不为空。
最佳答案
好吧,没人再回答我,我自己找到了解决方案:
我在适配器中添加了两个Arraylist,并在适配器本身内交换了数据。
适配器:
public class RecyclerViewAdapter extends RecyclerView.Adapter<ViewHolder> {
private ArrayList<TaskModel> tasks;
private ArrayList<TaskModel> tasks2;
private Context context;
public RecyclerViewAdapter(Context context, ArrayList<TaskModel> list1, ArrayList<TaskModel> list2){
tasks = list1;
tasks2 = list2;
this.context = context;
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
holder.title.setText(tasks.get(position).getTitle());
holder.description.setText(tasks.get(position).getDescription());
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tasks2.add(tasks.get(position));
tasks.remove(position);
MainActivity.listView.getAdapter().notifyDataSetChanged();
MainActivity.finishedListView.getAdapter().notifyDataSetChanged();
}
});
}