java - Android: Volley 请求不起作用

Question

我是 android 和 volley 的新手。 我创建了一个登录程序 以从我的服务器获取json 数据，但它不工作。 单击登录按钮 后未显示json 响应。 我在下面粘贴我的代码。

MainActivity.java

package com.volley.cuser.volleyexample;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

public class MainActivity extends Activity {

    private TextView txtDisplay;
    EditText editText;
    EditText editText2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.username);
        editText2 = (EditText) findViewById(R.id.password);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void studentLogin(View view) {
        String username = editText.getText().toString();
        String password = editText2.getText().toString();
        RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
        String url = "http://afterklass.in/api/";
        JSONObject js = new JSONObject();
        try {
            JSONObject jsonobject = new JSONObject();

            jsonobject.put("email_mobile", username);
            jsonobject.put("passwd", password);
            jsonobject.put("m", "student");
            jsonobject.put("uc", "signin");
            jsonobject.put("signin", "Sign+In");

            js.put("data", jsonobject.toString());

        }catch (JSONException e) {
            e.printStackTrace();
        }
        JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.POST, url, js, new Response.Listener<JSONObject>() {

            @Override
            public void onResponse(JSONObject response) {
                // TODO Auto-generated method stub
                txtDisplay.setText("Response => " + response.toString());
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                //String json = null;

                //NetworkResponse response = error.networkResponse;
                //if(response != null && response.data != null){
                    //switch(response.statusCode){
                        //case 400:
                            //txtDisplay.setText("Error => " + response.data);
                            //break;
                    //}
                    //txtDisplay.setText("Error => " + response.statusCode);
                    //Additional cases
                //}
                Log.d("ERROR", error.toString());
            }
        });

        queue.add(jsObjRequest);
    }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText android:id="@+id/username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/username" />
    <EditText android:id="@+id/password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/password" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/login"
        android:onClick="studentLogin" />

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.volley.cuser.volleyexample" >

    <uses-permission android:name="android.permission.INTERNET"/>'

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 1

请将您的 jsonRequest 更改为 StringRequest 并为其添加自定义 header :

已编辑:

private static final String TAG = YourActivity.class.getSimpleName();
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                // Display the first 500 characters of the response string.
                Log.e(TAG, "Successfully signed in : " + response.toString());
            }
        }, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Log.e(TAG, "Error at sign in : " + error.getMessage());
    }
}) {
    @Override
    public HashMap<String, String> getParams() {
        HashMap<String, String> params = new HashMap<String, String>();
        params.put("email_mobile", username);
        params.put("passwd", password);
        params.put("m", "student");
        params.put("uc", "signin");
        params.put("signin", "Sign+In");
        return params;
    }
};

谢谢。