java - Android-Arraylist在循环外返回null

我在ResponseFinal日志中得到List<String> resultList响应为空，但是在循环内部，响应显示resultList中的项目

我不明白为什么resultlist在循环外返回空值。请帮忙

public List<String> getParseJson(String sName)
{
    final List<String> resultList = new ArrayList<String>();

    String name=sName.replace(" ", "%20");
    StringRequest stringRequest = new StringRequest(Request.Method.GET, Constants.BASE_URL + "/suggest_item/items/"+name +"/"+ Constants.API_KEY,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                // Result handling
                try {
                    JSONObject jsonObj = new JSONObject(response.toString());
                    JSONArray predsJsonArray = jsonObj.getJSONArray("Item");

                    for (int i = 0; i < predsJsonArray.length(); i++) {
                        System.out.println( predsJsonArray.get(i).toString());
                        resultList.add(predsJsonArray.get(i).toString());
                        Log.e("Response",resultList.toString());
                    }
                } catch (JSONException e) {
                    Log.e("JSOn", "Cannot process JSON results", e);
                }
           }
      }, new Response.ErrorListener() {
           @Override
           public void onErrorResponse(VolleyError error) {
                // Error handling
                System.out.println(error.toString());

           }
     });

     // Adding request to request queue
     Volley.newRequestQueue(context).add(stringRequest);

     Log.e("ResponseFinal",resultList.toString());
     return resultList;
}

我的日志：

E/Response: [1660309, 1660410]
E/ResponseFinal: []

最佳答案

在oncreate()之前声明List（在类级别定义resultList）

List<String> resultList = new ArrayList<String>();