将 ArrayList 放入参数 JsonObject

Question

我必须使用 Volley Framework 进行请求。这是一个带有 JSONObject 的 POST 请求。

我必须传递一个字符串和一个 JSONArray..但是我怎么能呢？

我从这个开始：

 private String mUrl;
    private ArrayList<String> mUrlDove;

  HashMap<String, String> params = new HashMap<String, String>();
            params.put("url", mUrl);
            params.put("urlDove", mUrlDove); ---> Wrong because mUrlDove is not a String


            mUrl = app.getInstance().getmUrlRestWS() + getString(R.string.path);

            JsonObjectRequest mRequest = new JsonObjectRequest(
                    mUrl, new JSONObject(params),
                    createMyReqSuccessListener(),
                    createMyReqErrorListener()) {
                @Override
                public Map<String, String> getHeaders() throws AuthFailureError {
                    return app.getInstance().createBasicAuthHeader();
                }
            };

如果我尝试使用浏览器，我必须设置这个：

{
  "url": "www.secret.com",
  "urlDove" : [ "www.google.com","www.yahoo.com"]
}

Answer 1

尝试传递 JSONObject 而不是 hashmap

JSONObject params = new JSONObject();
params.put("url", "www.secret.com");

JSONArray urlDove = new JSONArray();
urlDove.put("www.google.com");
urlDove.put("www.yahoo.com");

params.put("urlDove", urlDove);


JsonObjectRequest mRequest = new JsonObjectRequest(
                mUrl, params,
                createMyReqSuccessListener(),
                createMyReqErrorListener()) {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                return app.getInstance().createBasicAuthHeader();
            }
        };

解析json时参考https://stackoverflow.com/a/17810270/4810752

Answer 2

你需要先创建一个 JSON 数组然后存储它

private String mUrl;
private ArrayList<String> mUrlDove;

HashMap<String, String> params = new HashMap<String, String>();
        params.put("url", mUrl);
        JSONArray jsArray = new JSONArray(mUrlDove);
        params.put("urlDove", jsArray.toString()); 

        mUrl = app.getInstance().getmUrlRestWS() + getString(R.string.path);

        JsonObjectRequest mRequest = new JsonObjectRequest(
                mUrl, new JSONObject(params),
                createMyReqSuccessListener(),
                createMyReqErrorListener()) {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                return app.getInstance().createBasicAuthHeader();
            }
        };

Answer 3

JSONObject 可以接受 Java 对象，尝试使用

Map<String,Object> 

类似这样的：

    String mUrl;  //initialized somewhere else
    ArrayList<String> mUrlDove;  //initialized somewhere else

    Map<String, Object> jsonParams = new HashMap<>();
    jsonParams.put("url", mUrl);
    jsonParams.put("urlDove", mUrlDove);

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, new JSONObject(jsonParams),
            new Response.Listener<JSONObject>()
            {
                @Override
                public void onResponse(JSONObject response)
                {
                    Log.d("Volley Response: ", response.toString()); 
                    //do the other stuff you need...
                }
            },
            new Response.ErrorListener()
            {
                @Override
                public void onErrorResponse(VolleyError error)
                {
                    if (null != error.networkResponse)
                    {
                        Log.d(" Volley Error Code: ", "" + error.networkResponse.statusCode);
                       //probably throw an Exception or some MessageEvent
                    }
                }
            });

    requestQueue.add(request);

这适用于像

这样的复杂对象

 Map<String,<List<Map<String,Object>>>

最内部的对象是字符串和整数，而 List 被初始化为一个新的 ArrayList。

希望对您有所帮助！