Question

我正在构建一个项目应用程序，您可以在其中添加用户到任务。我所有的用户都有一个回收者视图。当您点击一个用户时，该用户已添加到阵列列表中，一切正常。我遇到的问题是您无法取消选择用户。点击已选择的用户时，应从阵列列表中删除该用户。你怎么做到这一点？

我的适配器：

public class AddPeopleToTaskAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {

public ArrayList<String> peopleToAddToTask = new ArrayList<String>();

public List<PeopleInProject> peopleInProjects;
public Context context;

public AddPeopleToTaskAdapter(Context context, List<PeopleInProject> peopleInProjects) {
    this.peopleInProjects = peopleInProjects;
    this.context = context;
}


@NonNull
@Override
public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.add_people_to_task_recyclerview, viewGroup, false);
    return new RecyclerViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull final RecyclerViewHolder viewHolder, final int i) {

    final PeopleInProject peopleToAdd = peopleInProjects.get(i);

    viewHolder.addedIcon.setVisibility(View.INVISIBLE);
    viewHolder.nameLbl.setText(peopleToAdd.getUserName());
    viewHolder.setItemClickListenerPeopleToAdd(new ItemClickListenerPeopleToAdd() {
        @Override
        public void onClick(View view, int position) {
            Toast.makeText(context, "You added " + peopleToAdd.getEmail(), Toast.LENGTH_SHORT).show();
            peopleToAddToTask.add(peopleToAdd.getUserId().toString());
            viewHolder.addedIcon.setVisibility(View.VISIBLE);
            viewHolder.addIcon.setVisibility(View.INVISIBLE);

            if (peopleToAddToTask.contains(peopleToAdd.getUserId().toString())) {

            }
        }
    });


}

@Override
public int getItemCount() {
    return peopleInProjects.size();
}

当添加用户（addedIcon）时，我还会显示图像。正确显示。取消选择用户时，该图像应替换为addIcon。

我尝试过，但是没有用。

@Override
public void onBindViewHolder(@NonNull final RecyclerViewHolder viewHolder, final int i) {

    final PeopleInProject peopleToAdd = peopleInProjects.get(i);

    viewHolder.addedIcon.setVisibility(View.INVISIBLE);
    viewHolder.nameLbl.setText(peopleToAdd.getUserName());
    viewHolder.setItemClickListenerPeopleToAdd(new ItemClickListenerPeopleToAdd() {
        @Override
        public void onClick(View view, int position) {
            Toast.makeText(context, "You added " + peopleToAdd.getEmail(), Toast.LENGTH_SHORT).show();
            peopleToAddToTask.add(peopleToAdd.getUserId().toString());
            viewHolder.addedIcon.setVisibility(View.VISIBLE);
            viewHolder.addIcon.setVisibility(View.INVISIBLE);

            if (peopleToAddToTask.contains(peopleToAdd.getUserId().toString())) {

                peopleToAddToTask.remove(i);
                viewHolder.addedIcon.setVisibility(View.INVISIBLE);
                viewHolder.addIcon.setVisibility(View.VISIBLE);

            }
        }
    });


}

感谢所有帮助。 Tnx！

Answer 1

我认为您应该首先遍历数组并检查是否包含该用户

for(int i = 0; i < peopleToAddToTask.size(); i++){
   if (peopleToAddToTask.contains(peopleToAdd.getUserId().toString())) {
      peopleToAddToTask.remove(i);
      viewHolder.addedIcon.setVisibility(View.INVISIBLE);
      viewHolder.addIcon.setVisibility(View.VISIBLE);
   }
}

在recyclerview中单击项目时，从列表中删除项目

1 个答案: