Question

关于更新自定义列表视图有很多问题，一个常见问题似乎是ArrrayList为in this answer的参考问题或者未从UI线程调用更新。虽然我没有设法用这些例子解决我的问题。

据我所知，Arraylist（nameScoresList）正在更新，并且在调用getView时似乎也会调用适配器中的notifyDatasetChanged函数。查看代码中不同位置的日志，Arraylist正在使用新值进行更改。

但是，应用程序的屏幕仍然保留原始列表视图，并且不会随着nameScoresList的更改值而更改。

任何人都可以看到我犯的错误吗？感谢

我的适配器的代码是：

public class ListViewAdapter extends BaseAdapter{

    public ArrayList<HashMap<String, String>> list;
    Activity activity;
    TextView txtFirst;
    TextView txtSecond;

    public ListViewAdapter(Activity activity, ArrayList<HashMap<String, String>> list){
        super();
        this.activity=activity;
        this.list=list;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater=activity.getLayoutInflater();

        if(convertView == null){
            convertView=inflater.inflate(R.layout.list_row_name_score, null);
            txtFirst=(TextView) convertView.findViewById(R.id.name);
            txtSecond=(TextView) convertView.findViewById(R.id.score);
        }

        HashMap<String, String> map=list.get(position);
        txtFirst.setText(map.get(FIRST_COLUMN));
        txtSecond.setText(map.get(SECOND_COLUMN));
        Log.d("CHECK_UPDATE", map.get(SECOND_COLUMN));
        return convertView;
    }

//  Two previous attempts at an update function
//
//    public void refreshScores(float[] outputScores) {
//        int count = 0;
//        for(HashMap<String, String> entry : this.list) {
//            entry.put(SECOND_COLUMN, Float.toString(outputScores[count]));
//            count += 1;
//        }
//        this.notifyDataSetChanged();
//    }

//    public void refreshScores(ArrayList<HashMap<String, String>> nameScoresList) {
//        list.clear();
//        list.addAll(nameScoresList);
//        this.notifyDataSetChanged();
//    }
}

这些是我认为与主要活动相关的部分（如果需要，我可以添加更多）：

private ArrayList<HashMap<String, String>> nameScoresList = new ArrayList<HashMap<String, String>>();

public class SpeechActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {

    // Put data in nameScoresList;
    for (int i=0; i < speakerJson.entrySet().size(); i++){
      nameScoresList.add(new HashMap<String, String>());
    }
    int ID_number;
    for (Map.Entry<String, JsonElement> entry : speakerJson.entrySet()) {
      speaker = entry.getKey();
      ID_number = entry.getValue().getAsInt();
      HashMap<String,String> temp=new HashMap<String, String>();
      temp.put(FIRST_COLUMN, speaker.replace("_", " "));
      temp.put(SECOND_COLUMN, Float.toString(0));
      nameScoresList.set(ID_number - 1, temp);
    }

    adapter = new ListViewAdapter(this, nameScoresList);
    nameScoresLV.setAdapter(adapter);
    record();
}

  private void record() {
    // Get outputScores

    // Update Arraylist which ListView uses
    int count = 0;
    for (HashMap<String, String> entry : nameScoresList) {
      entry.put(SECOND_COLUMN, Float.toString(outputScores[count]));
      count += 1;
    }

    runOnUiThread(
        new Runnable() {
          @Override
          public void run() {
            adapter.notifyDataSetChanged();
            // These are calls which correspond to the commented functions in ListViewAdapter class
            //adapter.refreshScores(outputScores);
            //adapter.refreshScores(nameScoresList);
        }
    });
}

更改后自定义列表视图未刷新

0 个答案: