Question

我有一个应用，我使用mysql从php api插入并检索gps数据。我发送或获取数据没有问题，我正在努力的部分是当我尝试向我的api发送参数时（例如user_id）我得到Error Data这意味着我'我的要求做错了。我正在尝试发送user_id，然后将数据检索到与该ID相关联的listview。我看到了一些使用JsonArrayRequest的例子，这可能是我应该使用的，但是我一直在尝试使用Post方法和params来实现它。

public void test( final String id_user){


        RequestQueue requestQueue = 
Volley.newRequestQueue(MeusTrilhos.this);
        StringRequest stringRequest = new StringRequest(Request.Method.POST, 
urlget, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                int count = response.length();

                try {
                    for(int i = 0; i < count; i++){
                    JSONObject jo = new JSONObject(response);

                    Trilhos tri = new Trilhos();


                    tri.setId(jo.getInt("id"));
                    tri.setTitulo(jo.getString("titulo"));
                    tri.setId_user(jo.getInt("id_user"));
                    tri.setDificuldade(jo.getString("dificuldade"));
                    TrilhosList.add(tri);

                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                    Toast.makeText(MeusTrilhos.this, "error data", 
Toast.LENGTH_SHORT).show();
                    adapter.notifyDataSetChanged();
                }
            }

            }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.i("HttpError", "erro" + error);
            }

        }){
            @Override
            protected Map<String, String> getParams() throws 
AuthFailureError {
                    Map<String, String> stringMap = new HashMap<>();

                    stringMap.put("id_user", id_user);


                    return stringMap;

            }
        };

        requestQueue.add(stringRequest);
    }
}

这是我的php脚本

if($_SERVER['REQUEST_METHOD']=='POST'){ 
$id_user = $_POST['id_user'];
$user = "root";
$pass = "";
$host= "localhost";
$dbname="check";

$con = mysqli_connect($host,$user,$pass,$dbname);
$stmt=$con->prepare("SELECT id,titulo, id_user,dificuldade FROM trilhos 
where id_user='".$id_user."'");
//executing the query 
$stmt->execute();
$stmt->bind_result($id, $titulo, $id_user, $dificuldade);
$trilhos=array();
while($stmt->fetch()){
    $temp=array();
    $temp['id']=$id;
    $temp['titulo']=$titulo;
    $temp['id_user']=$id_user;
    $temp['dificuldade']=$dificuldade;
    array_push($trilhos, $temp);
    }



echo json_encode($trilhos);

mysqli_close($con);
}

错误日志

at org.json.JSON.typeMismatch(JSON.java:111)
false mManagedProfileInQuietMode: false mKeyguardVisible: false 
mCurrentUserId:0 mCurrentProfileId:0 mSecondSpaceStatusIconVisible: true 
showIcon:false
W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:160)
at org.json.JSONObject.<init>(JSONObject.java:173)
trilhosportugal.MeusTrilhos$1.onResponse(MeusTrilhos.java:135)
trilhosportugal.MeusTrilhos$1.onResponse(MeusTrilhos.java:128)

Answer 1

解决了它，试图检索jsonobject而不是jsonarray

public void test2(final String id_user){
RequestQueue requestQueue = Volley.newRequestQueue(MeusTrilhos.this);
StringRequest stringRequest=new StringRequest(Request.Method.POST, urlget,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                System.out.println(response);
                Toast.makeText(MeusTrilhos.this, "boa entrou", 
Toast.LENGTH_LONG).show();
                try {
                    JSONArray array=new JSONArray(response);
                    for (int i=0; i < array.length(); i++) {
                        JSONObject jo=array.getJSONObject(i);

                        Trilhos tri = new Trilhos();


                        tri.setId(jo.getInt("id"));
                        tri.setTitulo(jo.getString("titulo"));
                        tri.setId_user(jo.getInt("id_user"));
                        tri.setDificuldade(jo.getString("dificuldade"));
                        TrilhosList.add(tri);

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

                adapter.notifyDataSetChanged();

            }
        },
        new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(MeusTrilhos.this, "erro erro", 
Toast.LENGTH_LONG).show();
            }
        }) {
    @Override
    protected Map<String, String> getParams() {
        Map<String, String> params=new HashMap<String, String>();

        params.put("id_user", id_user);


        return params;
    }

};
requestQueue.add(stringRequest);
}

通过截击发送参数并获得响应

1 个答案: