如何在更新后刷新RecyclerView项目

Question

我有一个RecyclerView我更新了适配器中的数据，我的问题是更改后我无法刷新RecyclerView数据。

我使用notifyDataSetChanged();但是不起作用

UpdateStudent编辑学生姓名，问题是在更改后，RecyclerView需要刷新列表

ReyclerView适配器：

public class RecyclerViewAdapter_StudentList extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    List<StudentTable> tableData = new ArrayList<>();

    Context context;

    private LayoutInflater mInflater;

    public RecyclerViewAdapter_StudentList(Context context, List<StudentTable> tableData) {
        this.mInflater = LayoutInflater.from(context);
        this.context = context;
        this.tableData = tableData;
    }

    public class itemHolder extends RecyclerView.ViewHolder {

        TextView studentName;

        return new itemHolder(view);
    }
}

onBindViewHolder

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

    itemHolder itemHolder = (itemHolder) holder;

    String studentName = tableData.get(position).getStudentName();

    itemHolder.studentName.setText(studentName);

    itemHolder.editStudent_Button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {           
            String studentName_new = studentName_EditText.getText().toString();

            database.UpdateStudent(classId , studentName_new);

            notifyDataSetChanged();// does not work           
        }      
    }
}

Answer 1

此处您仅通知适配器而不更改数据列表，因此您需要这样做 更新表格中的检索数据并将其存储在当前列表tableData中，然后您必须致电notifyDataSetChanged();

Answer 2

试试这个：

itemHolder.editStudent_Button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v)
    {           
        String studentName_new = studentName_EditText.getText().toString();            
        database.UpdateStudent(classId , studentName_new);

        StudentTable student = tableData.get(position);
        student.setName(studentName_new);
        tableData.set(position, student);
        notifyItemChanged(position);          
    }      
}

Answer 3

itemHolder.editStudent_Button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v)
    {           
        String studentName_new = studentName_EditText.getText().toString();            
        database.UpdateStudent(classId , studentName_new);

        StudentTable student = tableData.get(position);
        student.setName(studentName_new);
         notifyItemChanged(position);

    }      
}