java - Arraylist 不断显示最后一个元素 n 次

Question

我创建了一个数组列表来存储从网络服务获取的数据。每次迭代后都会获取数据，但数组列表中仅显示最后一个元素。我尝试了各种解决方案，但对我的情况似乎没有帮助

       public void onResponse(JSONObject paramAnonymousJSONObject)
      {
     JSONObject localJSONObject;
     int j;
     try
     {
       localJSONObject = paramAnonymousJSONObject.getJSONObject("status");
       j = localJSONObject.getInt("code");
       if (j == 200) {
         JSONArray carModelArray = paramAnonymousJSONObject.getJSONArray("carModels");
         for (int i = 0; i <= carModelArray.length(); i++) {
           JSONObject tariffResponse = null;
           JSONObject tariff = carModelArray.getJSONObject(i);
           try {
             carId = tariff.getString("id");
             segment = tariff.getString("segment");
             imageURL = tariff.getString("imageURL");
             tariffResponse = tariff.getJSONObject("tariffResponse");
             CarType = tariffResponse.getString("carModel");
             weekdayTariff = tariffResponse.getString("weekdayTariff");
             weekendTariff = tariffResponse.getString("weekendTariff");
             peakSeasonTariff = tariffResponse.getString("peakSeasonTariff");
             maintenanceCharge = tariffResponse.getString("maintainanceFee");
             securityDeposite = tariffResponse.getString("securityDeposite");
             ArrayList arrayList = TariffActivity.this.tariffModelsList;
             arrayList.add(new TariffModel(carId, CarType, imageURL, "\u20b9 " + weekdayTariff, "\u20b9 " + weekendTariff, "\u20b9 " + peakSeasonTariff, "\u20b9 " + securityDeposite, segment, "\u20b9 " + maintenanceCharge));
             TariffActivity.this.tariffAdapter = new TariffAdapter(TariffActivity.this.mContext,arrayList);
             TariffActivity.this.mRecyclerView.setAdapter(tariffAdapter);
           } catch (JSONException e) {
             e.printStackTrace();
           }

         }

Answer 1

执行如下操作。

public void onResponse(JSONObject paramAnonymousJSONObject)
    {
        JSONObject localJSONObject;
        int j;
        try
        {
            localJSONObject = paramAnonymousJSONObject.getJSONObject("status");
            j = localJSONObject.getInt("code");
            if (j == 200) {
                JSONArray carModelArray = paramAnonymousJSONObject.getJSONArray("carModels");
                ArrayList arrayList = TariffActivity.this.tariffModelsList;
                for (int i = 0; i <= carModelArray.length(); i++) {
                    JSONObject tariffResponse = null;
                    JSONObject tariff = carModelArray.getJSONObject(i);
                    try {
                        carId = tariff.getString("id");
                        segment = tariff.getString("segment");
                        imageURL = tariff.getString("imageURL");
                        tariffResponse = tariff.getJSONObject("tariffResponse");
                        CarType = tariffResponse.getString("carModel");
                        weekdayTariff = tariffResponse.getString("weekdayTariff");
                        weekendTariff = tariffResponse.getString("weekendTariff");
                        peakSeasonTariff = tariffResponse.getString("peakSeasonTariff");
                        maintenanceCharge = tariffResponse.getString("maintainanceFee");
                        securityDeposite = tariffResponse.getString("securityDeposite");

                        arrayList.add(new TariffModel(carId, CarType, imageURL, "\u20b9 " + weekdayTariff, "\u20b9 " + weekendTariff, "\u20b9 " + peakSeasonTariff, "\u20b9 " + securityDeposite, segment, "\u20b9 " + maintenanceCharge));

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
                TariffActivity.this.tariffAdapter = new TariffAdapter(TariffActivity.this.mContext,arrayList);
                TariffActivity.this.mRecyclerView.setAdapter(tariffAdapter);

你必须在for循环之外编写ArrayList赋值，因为如果你在in循环内部编写，那么它每次都会重新初始化，所以你必须添加的元素在之后是清楚的重新初始化。这就是为什么列表中只有最后一项。