android - 列表视图不显示

Question

我正在使用 android 这是我的代码：

public void done(List<ParseObject> colList, ParseException e) {
       if (e == null) {
          dataList = new ArrayList<String>();   
          for(int counter = 0; counter < colList.size(); counter++)
          {
           String data =  colList.get(counter).getString("name");
           dataList.add(data);
          }
          listAdapter = new ArrayAdapter<String>(WardRobeActivity.this, 
                            android.R.layout.simple_list_item_1,dataList);
          ListView listview = (ListView)findViewById(R.id.listView);
          listview.setAdapter(listAdapter);
       } else {
          Log.d("score", "Error: " + e.getMessage());
       }

我正在从云端获取数据。colList 有来自云的数据列表，我将它添加到 arrayList 然后将其设置为 listView 适配器我的代码有什么问题？

Answer 1

首先创建 listAdapter 并添加data.

[...]
listAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);
ListView listview = (ListView)findViewById(R.id.listView);
listview.setAdapter(listAdapter);

public void done(List<ParseObject> objects, ParseException e) {
       if (e == null) {
           listAdapter.add(String.valueOf(colList.size())); //only a Test 
           for(int counter = 0; counter < colList.size(); counter++)
              {
                String data =  colList.get(counter).getString("name");
                if (data == "") 
                  {
                    listAdapter.add("no name");
                  } else {
                    listAdapter.add(data);
                  }
              }
       listAdapter.notifyDataSetChanged(); 
       [...]