EditText Werte werden beim Scrollen von Listenansicht Android

Question

public class Custom_Student_marks_list_faculty_adapter extends ArrayAdapter<MarksStudentListFacultyObject> { 
    private Activity context; 
    private List<MarksStudentListFacultyObject> studentlist; 

    public Custom_Student_marks_list_faculty_adapter(Activity context,List<MarksStudentListFacultyObject> studentlist) { 
     super(context,R.layout.custom_listview_marks_faculty,studentlist); 
     this.context=context; 
     this.studentlist=studentlist; 
    } 

    @Override 
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) { 

     final ViewHolder holder; 
     if(convertView==null) { 
      LayoutInflater inflater = context.getLayoutInflater(); 
      convertView = inflater.inflate(R.layout.custom_listview_marks_faculty, null); 
      holder = new ViewHolder(); 
      holder.name = (TextView) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_name_id); 
      holder.marks = (EditText) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_marks_id); 
      String mark = holder.marks.getText().toString(); 

      MarksStudentListFacultyObject student_list = studentlist.get(position); 

      holder.name.setText(student_list.getName()); 
      holder.marks.setText(mark); 
      holder.marks.setTag(position); 
      convertView.setTag(holder); 
     } else { 
      holder =(ViewHolder)convertView.getTag(); 
     } 

     holder.name.setText(studentlist.get(position).getName()); 
     holder.marks.setText(studentlist.get(position).getMakrs()); 

     return convertView; 
    } 
} 

class ViewHolder { 
    protected TextView name; 
    protected EditText marks; 
} 

Ich habe viele Lösungen dafür gesehen, aber es funktioniert nicht für mich. Bei jedem Scrollen werden die Werte ListView gelöscht.

Answer 1

Hoffnung dies funktionieren wird ...

public Custom_Student_marks_list_faculty_adapter(Activity context,List<MarksStudentListFacultyObject> studentlist) { 
     super(context,R.layout.custom_listview_marks_faculty,studentlist); 
     this.context=context; 
     this.studentlist=studentlist; 
    } 


    @NonNull 
    @Override 
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) { 

     final ViewHolder holder; 
     if(convertView==null) { 
      LayoutInflater inflater = context.getLayoutInflater(); 
      convertView = inflater.inflate(R.layout.custom_listview_marks_faculty, null); 
      holder = new ViewHolder(); 
      holder.name = (TextView) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_name_id); 
      holder.marks = (EditText) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_marks_id); 
      convertView.setTag(holder); 
     } else { 
      holder =(ViewHolder)convertView.getTag(); 
     } 

      MarksStudentListFacultyObject student_list = studentlist.get(position); 
      holder.name.setText(student_list.getName()); 
      //holder.marks.setText(student_list.getMarks()); 

     return convertView; 
    } 

Answer 2

Sie müssen die EditText Werte wieder in Studentenliste aktualisieren, da der Recycling Natur der Listenansicht und stellen Sie auch den Wert für jedes Verfahren Zeit GetView ist namens.

Etwas wie:

public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) { 

    final ViewHolder holder; 
    if(convertView==null) { 
     LayoutInflater inflater = context.getLayoutInflater(); 
     convertView = inflater.inflate(R.layout.custom_listview_marks_faculty, null); 
     holder = new ViewHolder(); 
     holder.name = (TextView) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_name_id); 
     holder.marks = (EditText) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_marks_id); 
     convertView.setTag(holder); 
    } else { 
     holder =(ViewHolder)convertView.getTag(); 
    } 

     MarksStudentListFacultyObject student_list = studentlist.get(position); 
     holder.name.setText(student_list.getName()); 
     holder.marks.setText(student_list.getMarks()); 
     holder.marks.addTextChangedListener(new TextWatcher() { 

     @Override 
     public void onTextChanged(CharSequence s, int start, 
       int before, int count) { 
      //set data to array when changed 
      student_list.setMarks(s.toString()); 
     } 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, 
       int count, int after) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 

     } 
    }); 

    return convertView; 
} 

Answer 3

Versuchen Sie folgendes:

@Override 
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) { 

    if(convertView==null) { 
     LayoutInflater inflater = context.getLayoutInflater(); 
     convertView = inflater.inflate(R.layout.custom_listview_marks_faculty, null); 
    } 

    TextView name = (TextView) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_name_id); 
    EditText marks = (EditText) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_marks_id); 

    name.setText(studentlist.get(position).getName()); 
    marks.setText(studentlist.get(position).getMakrs()); 

    return convertView; 
} 

Edit:

Aufschalten getCount() -Methode in ArrayAdaptor:

@Override public int getCount(){ return studentlist.size(); } 

Answer 4

Versuchen:

@Override 
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) { 

     final ViewHolder holder; 
     if(convertView==null) { 
      LayoutInflater inflater = context.getLayoutInflater(); 
      convertView = inflater.inflate(R.layout.custom_listview_marks_faculty, null); 
      holder = new ViewHolder(); 
      holder.name = (TextView) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_name_id); 
      holder.marks = (EditText) convertView.findViewById(R.id.custom_listview_marks_faculty_stu_marks_id); 
         convertView.setTag(holder); 
     } else { 
      holder =(ViewHolder)convertView.getTag(); 
     } 


     String mark = holder.marks.getText().toString(); 

      MarksStudentListFacultyObject student_list = studentlist.get(position); 

      holder.name.setText(student_list.getName()); 
      holder.marks.setText(mark); 


      return convertView; 
    } 
}