在Android中的BaseAdapter中的彈出菜單內重命名ListView項目後更新ListView

Question

我有一個ListView，它有一個自定義適配器和一個PopupMenu給列表項上的一些選項，包括重命名選項。重命名列表項後，我想刷新ListView並顯示重命名的列表項。
以下是我的代碼。

DocumentsFragment

public class DocumentsFragment extends Fragment{ 
@Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_my_doc, container, false);  

     ArrayList<FolderBean> folderList = new ArrayList<FolderBean>(); 
     fileNames = fileFunctions.listFileNames(Environment.getExternalStorageDirectory() + "/Documents/Files"); 

     for(int i = 0; i < fileNames.length; i++){ 
      folderList.add(new FolderBean(fileNames[i], "text")); 
     } 

     listView = (ListView) rootView.findViewById(R.id.myDocList); 
     CustomFolderListAdapter cAdapter = new CustomFolderListAdapter(getActivity(), folderList); 
     listView.setAdapter(cAdapter); 
     listView.setOnItemClickListener(this);   
     listView.setOnItemLongClickListener(this); 

     return rootView; 
    } 
} 

CustomFolderListAdapter

public class CustomFolderListAdapter extends BaseAdapter { 

    private ArrayList<FolderBean> folderList; 
    private Context context; 
    private FolderBean folderBean; 

    public CustomFolderListAdapter(Context applicationContext, ArrayList<FolderBean> questionForSliderMenu) { 
     super(); 
     this.context = applicationContext; 
     this.folderList = questionForSliderMenu;  
    } 

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

     folderBean = new FolderBean(); 
     folderBean = folderList.get(position); 

     if (convertView == null) { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.folder_popup_item, null); 
     } 

     TextView fileName = (TextView) convertView.findViewById(R.id.file_name); 
     ImageView fileImage = (ImageView) convertView.findViewById(R.id.file_icon); 
     ImageView fileOptions = (ImageView) convertView.findViewById(R.id.file_options_icon); 

     fileOptions.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       switch (view.getId()) { 
        case R.id.file_options_icon: 
         PopupMenu popup = new PopupMenu(context, view); 
         popup.getMenuInflater().inflate(R.menu.clipboard_popup, popup.getMenu()); 
         popup.show(); 
         popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() { 
          @Override 
          public boolean onMenuItemClick(MenuItem item) { 

           switch (item.getItemId()) { 
           case R.id.file_rename_menu: 


            final String filename = folderList.get(position).getName(); 
            final String ext = filename.substring(filename.indexOf(".") + 1); 

            AlertDialog.Builder builderR = new AlertDialog.Builder(context); 
            builderR.setTitle("Rename file"); 
            builderR.setCancelable(true); 

            final EditText input = new EditText(context); 
            input.setText(filename.substring(0, filename.indexOf("."))); 
            builderR.setView(input); 

            builderR.setPositiveButton("Rename", new DialogInterface.OnClickListener() { 

             @Override 
             public void onClick(DialogInterface dialog, int which) { 
              if(input.getText().toString().equals("")){ 
               UtilClass.getInstance().displayToast(context, "Please enter a name for the file", Toast.LENGTH_LONG); 
              } 
              else{ 
               File from = new File(Environment.getExternalStorageDirectory() + "/Documents/Files/" + filename); 

               File to = new File(Environment.getExternalStorageDirectory() + "/Documents/Files/" + input.getText().toString() + "." + ext); 

               boolean renamed = from.renameTo(to); 

               if(renamed){ 
                System.out.println("The position is " + position); 
                /** I have to do it here, don't I? How should I update the listview with the renamed file name?  **/         
                notifyDataSetChanged(); 
               }            
              } 
             }          
            }); 

            builderR.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 

             @Override 
             public void onClick(DialogInterface dialog, int which) { 
              dialog.dismiss(); 
             } 
            }); 

            AlertDialog alertR = builderR.create(); 
            alertR.show(); 

            break; 
           } 
          } 
         }); 
       } 
      } 
     } 

    } 
} 

Answer 1

您應該重新填充folderlist然後調用Notifydatasetchanged。

fileNames = fileFunctions.listFileNames(Environment.getExternalStorageDirectory() + "/Documents/Files"); 

    for(int i = 0; i < fileNames.length; i++){ 
     folderList.add(new FolderBean(fileNames[i], "text")); 
    }