如何使用相同的调整器在回收器视图上显示多个模型？

Question

我有两种具有不同属性的不同类型的对象（例如：User和Student）。

用户：标题，描述；学生：标题，描述，USN；

有没有一种方法可以使用相同的适配器在回收者视图中首先显示两个用户，然后显示学生？即使是两个适配器，如何显示它。我不想要两个回收者视图。

请注意，给出的示例非常简单。更改不只是在UI中。如果更改仅在UI中，则可以使用getItemViewType（），但此处的更改在模型本身中。

清单和清单

我们如何将两个列表都设置为同一适配器？

Answer 1

您必须使用覆盖方法“ getItemViewType（position）”。

然后像这样按ViewType返回ViewHolder，

  @Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder viewHolder = null;
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());

    switch (viewType) {
        case ITEM:
            View v1 = inflater.inflate(R.layout.item_student, parent, false);
            viewHolder = new UserVH(v1);
            break;
        case LOADING:
            View v2 = inflater.inflate(R.layout.item_user, parent, false);
            viewHolder = new StudentVH(v2);
            break;
    }
    return viewHolder;
}

编辑：

 public class StudentVH extends RecyclerView.ViewHolder {
    //Declare student views

    public ViewHolder(View v) {
        super(v);
        //Inialize student views
    }
}

 public class UserVH extends RecyclerView.ViewHolder {
    //Declare user views

    public ViewHolder(View v) {
        super(v);
        //Inialize user views
    }
}

第二编辑：

您的适配器应该是这样的，

public class ClGAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private List<UserBean> userBeans;
private List<StudentBean> studentBeans;
private UserBean userBeanItem;
private StudentBean studentBeanItem;
private int size = 0;


public ClGAdapter(Context context, List<UserBean> userBeans, List<StudentBean> studentBeans) {
    this.context = context;
    this.userBeans = userBeans;
    this.studentBeans = studentBeans;
    this.size = userBeans.size() + studentBeans.size();
}


@Override
public int getItemViewType(int position) {

    if (position > (userBeans.size() - 1)) {
        return 2;//TYPE_STUDENT
    } else {
        return 1; //TYPE_USER
    }
}

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {

    int viewType = holder.getItemViewType();

    userBeanItem = userBeans.get(position);
    studentBeanItem = studentBeans.get(position);
    switch (viewType) {
        case 1:
            ((UserHolder) holder).mUserName.setText(userBeanItem.getUserName());
            break;
        case 2:
            ((StudentHolder) holder).mStudentName.setText(studentBeanItem.getStudentName());
            break;
        default:
            break;
    }

}

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

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    int layout = 0;
    RecyclerView.ViewHolder viewHolder;
    switch (viewType) {
        case 1: 
            layout = R.layout.user_card;
            View userView = LayoutInflater.from(parent.getContext()).inflate(layout, parent, false);
            viewHolder = new UserHolder(userView);
            break;
        case 2:
            layout = R.layout.student_card;
            View studentView = LayoutInflater.from(parent.getContext()).inflate(layout, parent, false);
            viewHolder = new StudentHolder(studentView);

            break;
        default:
            viewHolder = null;
            break;
    }
    return viewHolder;
}

public class UserHolder extends RecyclerView.ViewHolder {
    private TextView mUserName;

    public UserHolder(View v) {
        super(v);
        mUserName = v.findViewById(R.id.user_name);
    }
}

public class StudentHolder extends RecyclerView.ViewHolder {
    private TextView mStudentName;

    public StudentHolder(View v) {
        super(v);
        mStudentName = v.findViewById(R.id.student_name);
    }
}
}