ListView中与customadapter重复的项目

Question

我有一个ToDo项目与列表视图，显示SQLite与自定义适配器的数据。此外，我有一个按钮来添加新的任务，但列表视图中的项目将被重复。

我的自定义适配器是

public class CustomAdapter extends BaseAdapter { 

    private final Activity activity; 
    private final ArrayList <LT_Model> data; 
    private static LayoutInflater inflater = null; 

    public CustomAdapter(Activity a, ArrayList <LT_Model> d) { 

     this.activity = a; 
     this.data = d; 
     inflater = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 
    public static class ViewHolder { 
     public TextView task; 
     public ImageView imgD; 
     public ImageView imgE; 
     public ImageView imgS; 
    }@ 
    Override 
    public int getCount() { 
     if (data.size() <= 0) 
      return 1; 
     return data.size(); 
    } 

    @ 
    Override 
    public Object getItem(int position) { 
     return position; 
    } 

    @ 
    Override 
    public long getItemId(int position) { 
     return position; 
    } 

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

     ViewHolder holder; 

     if (convertView == null) { 

      convertView = inflater.inflate(R.layout.item_todo, null); 

      holder = new ViewHolder(); 
      holder.task = (TextView) convertView.findViewById(R.id.task_title); 
      holder.imgD = (ImageView) convertView.findViewById(R.id.imgDelete); 
      holder.imgE = (ImageView) convertView.findViewById(R.id.imgEdit); 
      holder.imgS = (ImageView) convertView.findViewById(R.id.imgCheck); 


      convertView.setTag(holder); 
     } else 
      holder = (ViewHolder) convertView.getTag(); 


     if (data.size() <= 0) { 
      holder.task.setText("No Data"); 
     } else { 
      holder.task.setText(data.get(position).getTaskName()); 
      holder.imgD.setImageResource(android.R.drawable.ic_delete); 
      holder.imgE.setImageResource(data.get(position).getImgComment()); 
      holder.imgS.setImageResource(data.get(position).getImgStatus()); 
     } 

     return convertView; 

    } 
} 

我LT_Model与getter和setter

public class LT_Model { 
private String TaskName = ""; 
private int ImgComment; 
private int ImgStatus; 

public String getTaskName() { 
    return TaskName; 
} 

public void setTaskName(String taskName) { 
    TaskName = taskName; 
} 

public int getImgComment() { 
    return ImgComment; 
} 

public void setImgComment(int imgComment) { 
    ImgComment = imgComment; 
} 

public int getImgStatus() { 
    return ImgStatus; 
} 

public void setImgStatus(int imgStatus) { 
    ImgStatus = imgStatus; 
} 

}

我UpdateUI这回从SQLite的在活动ArrayList中的数据。 我的表有3列，我将它们传递给ArrayList。

private void updateUI() { 
    ArrayList<LT_Model> taskList = new ArrayList<>(); 
    LT_Model lt_model = new LT_Model(); 
    SQLiteDatabase db = mdb.getReadableDatabase(); 
    Cursor cursor = db.query(DB_Value.Constant.List_Table, 
      new String[]{DB_Value.Constant._ID, DB_Value.Constant.COL_Task, DB_Value.Constant.COL_Comment, 
      DB_Value.Constant.COL_Status}, null, null, null, null, null); 
    while (cursor.moveToNext()) { 
     //int idx = cursor.getColumnIndex(DB_Value.Constant.COL_Task); 
     lt_model.setTaskName(cursor.getString(1)); 
     Toast.makeText(getApplicationContext(), lt_model.getTaskName(), Toast.LENGTH_SHORT).show(); 
     if (cursor.getString(2) == null || cursor.getString(2).equals("")) { 
      lt_model.setImgComment(android.R.drawable.ic_menu_edit); 
     }else{ 
      lt_model.setImgComment(android.R.drawable.ic_menu_agenda); 
     } 
     if (cursor.getInt(3)==1){ 
      lt_model.setImgStatus(android.R.drawable.checkbox_on_background); 
     }else{ 
      lt_model.setImgStatus(android.R.drawable.checkbox_off_background); 
     } 

     taskList.add(lt_model); 
    } 

    mTaskListView.setAdapter(new CustomAdapter(dailyNew, taskList)); 

    cursor.close(); 
    db.close(); 
} 

这是我的问题。 当我添加第二个任务时，第一个任务的标题会随之改变，这对其他行重复。

Answer 1

，当你通过迭代光标，你需要为每行一个新的Model，所以你每次加一个不同的对象。

while (cursor.moveToNext()) { 
     LT_Model lt_model = new LT_Model();