java Android:截击请求不起作用

Question

我是新来的安卓和截击。 我创建了一个登录程序，从我的服务器获取json数据，但它不起作用。 单击登录按钮后，它不会显示json响应。 我正在下面粘贴我的代码

主要活动。java

package com.volley.cuser.volleyexample;

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

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

import com.安卓.volley.NetworkResponse;
import com.安卓.volley.Request;
import com.安卓.volley.RequestQueue;
import com.安卓.volley.Response;
import com.安卓.volley.VolleyError;
import com.安卓.volley.toolbox.JsonObjectRequest;
import com.安卓.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);
    }

}

主要活动。xml

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

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

</LinearLayout>

AndroidManifest。xml

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

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

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

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

</manifest>

Answer 1

将以下内容添加到您的构建中。格雷德尔锉刀

compile 'com.mcxiaoke.volley:library:1.0.19'

Answer 2

请将jsonRequest更改为StringRequest，并向其添加自定义标题：

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

Answer 3

在android清单行中：

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

把线的一端去掉

Answer 4

而不是下面的一行：

 RequestQueue queue = Volley.newRequestQueue(this);

将其更改为：

RequestQueue queue = Volley.newRequestQueue(MainActivity.this);

并在onCreate方法中声明您EditText，如下所示：

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);
  }

Answer 5

你也可以这样做：

    HashMap<String, String> params = new HashMap<String, String>();
    params.put("email_mobile", username);
    params.put("passwd", password);

    JSONObject parameters = new JSONObject(params);

    JsonObjectRequest newRequest = new JsonObjectRequest(Request.Method.POST, URL, parametres, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });

在这里，我们将对象传递给构造函数以获得正确的响应

Answer 6

当你发送JSON数据时，设置conent类型如下。。。 希望这能有所帮助

    @Override
    public Map<String, String> getHeaders ()
    throws AuthFailureError {
        Map<String, String> params = new HashMap<String,
                String>();
        params.put("Content-Type", "application/json");
        return params;
    }