ListView中显示的所有数据，而不只是我指定

Question

所以我遇到的问题是，我有一个哈希表与键值是

关键：整数 值：ArrayList的

在我的自定义的ListView适配器我已经设置为只显示哈希表中的某个位置的值..但目前它正在显示整个哈希表。我不太确定我在做什么错误。这里是适配器

注意：Statics.mainPageListPosition是一个静态int，当用户在主屏幕上的某个位置上单击时，它会被设置。然后我希望适配器显示该位置，并只显示该位置的数据。

package assignments; 

import java.util.ArrayList; 
import java.util.Hashtable; 

import com.example.mt_study.R; 
import com.example.statics.Statics; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 
import android.widget.Toast; 

public class AssignmentListViewAdapter extends ArrayAdapter<Assignment> { 

    private LayoutInflater inflater; 
    private Hashtable<Integer, ArrayList<Assignment>> assignmentList; 

    // class used to hold views when the user scrolls on the listView 
    // it stores them and then we can re-use their id's as the user scrolls 
    // down or up the screen so we don't have to keep calling findViewById 
    private class assignmentViewHolder { 
     TextView Title; 
     TextView Date; 

     public assignmentViewHolder(TextView assignmentTitle, TextView Date) { 
      this.Title = assignmentTitle; 
      this.Date = Date; 
     } 

     public TextView getTitle() { 
      return Title; 
     } 

     public TextView getDate() { 
      return Date; 
     } 
    } 

    public AssignmentListViewAdapter(Context context, 
      Hashtable<Integer, ArrayList<Assignment>> data) { 
     super(context, R.id.assignment_row_title, R.id.assignment_row_date); 
     inflater = LayoutInflater.from(context); 
     assignmentList = data; 

    } 

    // set of functions useful for the getView function 
    public int getCount() { 
     return Statics.allAssignments.get(Statics.mainPageListPosition).size(); 
    } 

    public Assignment getItem(int position) { 
     return assignmentList.get(Statics.mainPageListPosition).get(position); 
    } 

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

    public int getViewTypeCount() { 
     return 1; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     // Assignment assignment = this.getItem(position); 

     TextView assignmentTitle; 
     TextView assignmentDate; 

     // if theres no view yet created on the screen, create one 
     if (convertView == null) { 
      convertView = inflater.inflate(R.layout.assignment_row, null); 

      // give the views their respective ID's 
      assignmentTitle = (TextView) convertView 
        .findViewById(R.id.assignment_row_title); 
      assignmentDate = (TextView) convertView 
        .findViewById(R.id.assignment_row_date); 

      // set the tag so we can just use the viewHolder instead of calling 
      // findViewById over. It saves memory 
      convertView.setTag(new assignmentViewHolder(assignmentTitle, 
        assignmentDate)); 
     } 
     // this gets called when the user scrolls down or up the screen and the 
     // adapter 
     // wants to maximize efficiency by just calling the viewHolder instead 
     // of findViewById 
     else { 
      assignmentViewHolder viewHolder = (assignmentViewHolder) convertView 
        .getTag(); 
      assignmentTitle = viewHolder.getTitle(); 
      assignmentDate = viewHolder.getDate(); 

     } 
     // down here is where you set the values for all your views/objects 
     // such as Buttons or textViews. 
     assignmentTitle.setText(Statics.allAssignments 
       .get(Statics.mainPageListPosition).get(position).getTitle()); 
     assignmentDate.setText(Statics.allAssignments 
       .get(Statics.mainPageListPosition).get(position).getDate_due()); 

     return convertView; 
    } 
} 

编辑：最近的发现，我的散列表将我发送的每个值放在每个可用的位置lol。我所做的是当用户点击主页面上的一个位置时，它保存了该位置，并用它来存储他们保存在散列表中该位置的数据。 Temp是一个arrayList，用户保存的数据以这种格式存储：

{number，String，number，string} 其中number是散列表中的位置我想存储字符串。

这里是我将数据保存到散列表的地方。一切看起来都适合我，也许我一直盯着它太久了@@

for (int i = 0; i < temp.size(); i++) { 
       if (isInteger(temp.get(i))) { 
        currentAssignment.setTitle(temp.get(i + 1)); 
        //currentAssignment.setDate_due(temp.get(i + 2)); 
        currentAssignmentList.add(index, currentAssignment); 
        index++; 

        Statics.allAssignments.put(Integer.parseInt(temp.get(i)), currentAssignmentList); 
        //Statics.allAssignments.get(Integer.parseInt(temp.get(i))).add(currentAssignment); 
        currentAssignment = new Assignment(); 
        //Toast.makeText(context, "Called" + Integer.toString(i), Toast.LENGTH_SHORT).show(); 
       } 
      } 

Answer 1

你在哪里设置ArrayAdapter上的项目列表？我认为您应该使用您的data构造函数参数，或者使用addAll(data)或致电super()。请注意，您目前忽略getView()中的这些数据，并使用您的静态图代替。在getView()中，一旦您在超类ArrayAdapter中正确设置了项目，就应该使用Assignment a = getItem(position)并从该对象中设置字段而不是静态。

E.g.在构造函数中...

super(context, R.id.assignment_row_title, R.id.assignment_row_date, data); 

然后在getView（）...

Assignment a = getItem(position); 
assignmentTitle.setText(a.getTitle()); 
assignmentDate.setText(a.getDate_due()); 

当然，这假设您在传递作为data列表是正确的。希望一旦你有你的代码只查看一个项目列表，你可以更容易地验证这个列表是正确的。

编辑：

在你的代码的第二区块中，你为每个哈希表密钥生成新的currentAssignmentList在哪里？如果将同一个对象分配给散列表的所有条目，则它们将包含相同的列表。

Answer 2

当您更改mainPageListPosition值时，请不要忘记在adapter上致电notifyDataSetChanged。