如何讀取自定義適配器中的映射值

Question

我正在使用映射將值傳遞給自定義適配器。我如何獲得自定義適配器中的值。我的應用程序顯示一個沒有任何錯誤的空白屏幕。

的java文件

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

public class archive extends Fragment { 
    public archive() { 
    } 

    private archiveadapter tableRowAdapter; 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     Log.v("ListFragment", "onCreate()"); 
    } 

    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     Log.v("ListFragment", "onActivityCreated()."); 
     Log.v("ListsavedInstanceState", savedInstanceState == null ? "true" 
       : "false"); 

     // Generate list View from ArrayList 
     displayListView(); 

    } 

    public static final String ARG_SECTION_NUMBER = "section_number"; 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View v = inflater 
       .inflate(R.layout.moderationrequests, container, false); 

     return v; 
    } 

    private void displayListView() { 

     List<String> dialogtitle = new ArrayList<String>(); 
     dialogtitle 
       .add("Thief nabbed selling stolen mower to owner: Stupid, Clever or Calculated?"); 
     dialogtitle 
       .add("Will software development as a skilled profession ever become obsolete and possible by the average person?"); 

     List<String> membername = new ArrayList<String>(); 
     membername.add("By Pegasus"); 
     membername.add("By Andrew"); 

     List<String> postedon = new ArrayList<String>(); 
     postedon.add("6 months ago on Current Affairs"); 
     postedon.add("6 months ago on Current Affairs"); 

     List<Map<String, String>> list = new ArrayList<Map<String, String>>(); 
     Map<String, String> map; 
     int count = dialogtitle.size(); 
     for (int i = 0; i < dialogtitle.size(); i++) { 
      map = new HashMap<String, String>(); 
      map.put("dialogtitle", dialogtitle.get(i)); 
      map.put("membername", membername.get(i)); 
      map.put("postedon", postedon.get(i)); 
      list.add(map); 
     } 


     tableRowAdapter = new archiveadapter(getActivity(), 
       R.layout.dialog_archive_list, list); 
     ListView listView = (ListView) getView().findViewById(R.id.list_view); 

     listView.setAdapter(tableRowAdapter); 


    } 
} 

適配器

public class archiveadapter extends ArrayAdapter< List<Map<String,String>>> { 
     private final Context context; 
     private final List<Map<String, String>> names; 
     private Button deleteButton = null; 

     public archiveadapter(Context context, int itemResId, List<Map<String,String>> names) { 
      super(context, itemResId); 
      this.context = context; 
      this.names = names; 

     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      // LayoutInflater inflater = context.getLayoutInflater(); 
      // View rowView = inflater.inflate(R.layout.mod_req_list, null, true); 

      View rowView = convertView; 
      if (rowView == null) { 
       LayoutInflater inflater = LayoutInflater.from(context); 
       rowView = inflater.inflate(R.layout.dialog_archive_list, null); 

      } 
      TextView archivetitle = (TextView) rowView 
        .findViewById(R.id.dialogarchive_title); 

      Map<String, String> map = names.get(position); 
      //String link = map.get("Link"); 


      archivetitle.setText(map.get("dialogtitle")); 
      TextView membername = (TextView) rowView.findViewById(R.id.membername); 
      membername.setText(names.get(1).toString()); 
      TextView votes = (TextView) rowView.findViewById(R.id.postedon); 
      votes.setText(names.get(2).toString()); 

      return rowView; 
     } 

    } 

任何意見或建議？ 謝謝，

Answer 1

你有這樣的

map.put("dialogtitle", dialogtitle.get(i)); 
map.put("membername", membername.get(i)); 
map.put("postedon", postedon.get(i)); 

適配器覆蓋getCount()

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

在getView

Map<String, String> map = names.get(position); 
    archivetitle.setText(map.get("dialogtitle")); 
    TextView membername = (TextView) rowView.findViewById(R.id.membername); 
    membername.setText(map.get("membername")); 
    TextView votes = (TextView) rowView.findViewById(R.id.postedon); 
    votes.setText(map.get("postedon")); 

編輯：

使用ViewHolder來平滑滾動和表現也更好。

http://developer.android.com/training/improving-layouts/smooth-scrolling.html

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // LayoutInflater inflater = context.getLayoutInflater(); 
     // View rowView = inflater.inflate(R.layout.mod_req_list, null, true); 
     ViewHolder vh = new ViewHolder(); 
     // View rowView = convertView; 
     if (convertView == null) { 

      LayoutInflater inflater = LayoutInflater.from(context); 
      convertView= inflater.inflate(R.layout.dialog_archive_list, null); 
      vh.archivetitle = (TextView) convertView.findViewById(R.id.textView1); 
      vh.membername = (TextView) convertView.findViewById(R.id.textView2); 
      vh.votes = (TextView) convertView.findViewById(R.id.textView3); 
      convertView.setTag(vh); 
     } 


    else 
    { 
     vh= (ViewHolder) convertView.getTag(); 

    } 
     Map<String, String> map = names.get(position); 
     vh.archivetitle.setText(map.get("dialogtitle")); 
     vh.membername.setText(map.get("membername")); 
     vh.votes.setText(map.get("postedon")); 

     return convertView; 
    } 
    static class ViewHolder 
     { 
      TextView archivetitle,membername,votes; 
     }