java - Getter 函数没有返回正确的值

Question

我是安卓新手。我正在开发一个应用程序。我有 json 格式的数据，我想在 ListView 中显示这些数据。我正在使用 baseadapter 和 setter 和 getter。但是 getter 函数返回的值与上次设置的值相同。这是我的代码。

    JSONArray arr = new JSONArray(strServerResponse);
     pojo = new Pojo();
     for (int k = 0; k < arr.length(); k++) {
            JSONObject jsonObj1 = arr.getJSONObject(k);
            date = jsonObj1.optString("login_date");
            inTime = jsonObj1.optString("login_time");
            outTime = jsonObj1.optString("logout_time");
            pojo.setDate(date);
            pojo.setLoginTime(inTime);
            pojo.setLogoutTime(outTime);
            Log.e("history activity date", "" + date);
            Log.e("history  intime", "" + inTime);
            Log.e("history  outtime", "" + outTime);
            history.add(pojo);
       }
    }

这就是我在 postExecute() 方法中设置适配器的方式

     myAdapter = new HistoryAdapter(HistoryActivity.this, history);
     list.setAdapter(myAdapter);

我的 setter 和 getter 函数

  public void setLoginTime(String loginTime) {
    this.loginTime = loginTime;
    Log.e("Settter loginTime",""+loginTime);
}

public String getLoginTime() {
    Log.e("getter loginTime",""+loginTime);
    return loginTime;

}

public void setLogoutTime(String logoutTime) {

    this.logoutTime = logoutTime;
    Log.e("Settter logoutTime",""+logoutTime);
}

public String getLogoutTime() {
    Log.e("getter loginTime",""+logoutTime);
    return logoutTime;
}

public void setDate(String date) {
    this.date = date;
    Log.e("Settter date",""+date);
}

public String getDate() {
    Log.e("getter date",""+date);
    return date;
}

还有这个适配器

  public class HistoryAdapter extends BaseAdapter {
private Context activity;
TextView datetime;
TextView inTime;
TextView outTime;


Pojo pojo;
ArrayList<Pojo> list;
private ArrayList<Pojo> arraylist=null;
public static LayoutInflater inflater;

public HistoryAdapter(Context a, ArrayList<Pojo> history){
    // TODO Auto-generated constructor stub
    activity=a;
    list=history;
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.arraylist = new ArrayList<Pojo>();
    this.arraylist.addAll(list);

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return list.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return list.get(position);
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View v = convertView;
    v = inflater.inflate(R.layout.history_item, parent, false);
    pojo = list.get(position);
    datetime = (TextView)v.findViewById(R.id.historyDate);
    datetime.setText(pojo.getDate());
    inTime = (TextView)v.findViewById(R.id.historyLoginTime);
    inTime.setText(pojo.getLoginTime());
    outTime = (TextView)v.findViewById(R.id.historyLogoutTime);
    outTime.setText(pojo.getLogoutTime());
    return v;

}

 }

这是我的json

  [{"login_time":"16:18:39","logout_time":"16:24:45","login_date":"2015-10-01"},{"login_time":"11:46:56","logout_time":"11:52:08","login_date":"2015-10-03"},{"login_time":"16:10:34","logout_time":"16:10:53","login_date":"2015-10-06"},{"login_time":"16:26:26","logout_time":"16:26:59","login_date":"2015-10-06"},{"login_time":"17:13:54","logout_time":"17:14:16","login_date":"2015-10-06"},{"login_time":"18:58:08","logout_time":"19:05:03","login_date":"2015-10-06"},{"login_time":"16:20:49","logout_time":"20:12:57","login_date":"2015-10-06"}]

更新

JSONArray arr = new JSONArray(strServerResponse);
 for (int k = 0; k < arr.length(); k++) {
        Pojo pojo = new Pojo();
        JSONObject jsonObj1 = arr.getJSONObject(k);
       date = jsonObj1.optString("login_date");
       inTime = jsonObj1.optString("login_time");
       outTime = jsonObj1.optString("logout_time");

       pojo.setDate(date);
       pojo.setLoginTime(inTime);
       pojo.setLogoutTime(outTime);
       Log.e("history activity date", "" + date);
       Log.e("history  intime", "" + inTime);
       Log.e("history  outtime", "" + outTime);
       history.add(pojo);
     }

请帮帮我...谢谢

Answer 1

是因为这里:

  pojo = new Pojo();
  for (int k = 0; k < arr.length(); k++) {

您只是一遍又一遍地更改相同的 Pojo 引用，而您希望在每次迭代时添加一个新实例:

  for (int k = 0; k < arr.length(); k++) {
    pojo = new Pojo();