使用volley库在android中获取JSONObject的值

Question

我想使用volley库在android中获取JSONObject的值.

这是我的MainActvity.java代码.

 String url = "http://someexample.com/signin.php";
        StringRequest postRequest = new StringRequest(Request.Method.POST, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonResponse = new JSONObject(response).getJSONObject("type");
                            String myObjAsString = jsonResponse.toString();

                            mTV.setText(myObjAsString.toString());

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        error.printStackTrace();
                    }
                }
        ) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                // the POST parameters:
                params.put("email", "example@outlook.com");
                params.put("password", "********");
                return params;
            }
        };
        Volley.newRequestQueue(this).add(postRequest);

这是我的Web服务响应.

{
   "type":"1",
   "data":{
      "userID":"197",
      "name":"Hasnain",
      "email":"example@outlook.com",
      "paymentstatus":1
   },
   "title":"Message",
   "message":"User loged in successfully",
   "_explicitType":null
}

这是我的错误堆栈.

09-08 11:22:21.068    4705-4825/com.example.alphabooksingintest D/OpenGLRenderer? Enabling debug mode 0
09-08 11:22:21.135    4705-4742/com.example.alphabooksingintest W/art? Suspending all threads took: 18.063ms
09-08 11:22:21.212    4705-4705/com.example.alphabooksingintest W/IInputConnectionWrapper? showStatusIcon on inactive InputConnection
09-08 11:22:30.150    4705-4742/com.example.alphabooksingintest W/art? Suspending all threads took: 16.658ms
09-08 11:22:30.918    4705-4705/com.example.alphabooksingintest W/System.err? org.json.JSONException: Value 1 at type of type java.lang.String cannot be converted to JSONObject
09-08 11:22:30.926    4705-4705/com.example.alphabooksingintest W/System.err? at org.json.JSON.typeMismatch(JSON.java:100)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at org.json.JSONObject.getJSONObject(JSONObject.java:613)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.example.alphabooksingintest.MainActivity$1.onResponse(MainActivity.java:42)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.example.alphabooksingintest.MainActivity$1.onResponse(MainActivity.java:38)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at android.os.Handler.handleCallback(Handler.java:739)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at android.os.Handler.dispatchMessage(Handler.java:95)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at android.os.Looper.loop(Looper.java:135)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at android.app.ActivityThread.main(ActivityThread.java:5312)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at java.lang.reflect.Method.invoke(Native Method)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at java.lang.reflect.Method.invoke(Method.java:372)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
09-08 11:22:30.927    4705-4705/com.example.alphabooksingintest W/System.err? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
09-08 11:23:37.309    4705-4742/com.example.alphabooksingintest W/art? Suspending all threads took: 5.080ms

我想从响应中获取"type"对象的值.

Answer 1

错误:

org.json.JSONException:类型为java.lang.String的类型的值1无法转换为JSONObject

从错误日志中我可以看到您正在尝试转换JSONObject为String您正在获取JSONException.

你需要从这个方面获得价值.type StringJSONObject

试试这段代码:

JSONObject jsonResponse = new JSONObject(response);
String myObjAsString = jsonResponse.getString("type");

代替

JSONObject jsonResponse = new JSONObject(response).getJSONObject("type");
String myObjAsString = jsonResponse.toString();

我希望它有所帮助!