YourFragment

Question

我目前正在使用Fragment类，它从其他类中获取String值。我需要将这些值填充到适配器类中并设置视图。学生到达时间和学生姓名的视图类数据由服务器获取 -

Student arrival time     Student name      Present/Absent
    10:50                  John
    10:55                  Alex
    11:00                  Peter  
    11:07                  Mark

我在Fragment类中获取Present / Absent的String值，我需要在适配器类中更新Present / Absent列中的视图。请注意，到达时间按升序排列。因此，当呼叫出席时，通过语音识别识别出现/缺席填写在当前/缺席列中。

我有两个问题 -

a）我需要为列学生姓名和学生到达时间

创建完全相同行数的文本视图

b）即使我为完全相同的行数创建了文本视图，如何每次都将textview值更改为“是”或“否”，因为更改textview一次会因其余部分而改变

Answer 1

我认为你应该使用RecyclerView

Here你可以找到一个很好的描述如何使用RecyclerView

以下是我的示例：它应该是什么样的：

YourFragment

public class YourFragment extends Fragment {

    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private RecyclerView.LayoutManager layoutManager;
    private List<Student> studentList;

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        studentList = new ArrayList<>();

        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
        adapter = new StudentsAdapter(studentList);

        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);

        //This method fetch students list from server and insert them into studentList
        fetchStudentsList();
    }
}

StudentsAdapter

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

    private List<Student> studentList;

    public StudentsAdapter(List<Student> studentList) {
        this.studentList = studentList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View itemView = inflater.inflate(R.layout.student_layout, parent, false);
        ViewHolder holder = new ViewHolder(itemView);
        holder.name = (TextView) itemView.findViewById(R.id.student_name);
        holder.arrivalTime = (TextView) itemView.findViewById(R.id.student_arrival_time);
        holder.present = (TextView) itemView.findViewById(R.id.student_present);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Student student = studentList.get(position);
        holder.name.setText(student.name);
        holder.arrivalTime.setText(student.arrivalTime);
        holder.present.setText(student.present ? R.string.yes : R.string.no);
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {

        public TextView name;
        public TextView arrivalTime;
        public TextView present;

        public ViewHolder(View itemView) {
            super(itemView);
        }
    }
}

Student.class

public class Student {
    public String arrivalTime;
    public String name;
    public boolean present;
}

要更新recyclerView中的某些信息，只需更改Student对象中的值，然后调用方法adapter.notifyDataSetChanged()

另见：

将String值获取到适配器类以进行查看

1 个答案:

YourFragment

StudentsAdapter

Student.class