Question

嘿，我在000webhost上有一些数据，我想发送到我的android工作室应用程序。我通过直接在000webhost上运行检查了查询，它正在运行。

但它没有向android studio发送数据。我尝试打印它打印的值为null。基本上数据即时发送试图发送一个数组。我的功能是在按钮点击时执行的。我希望标记出现在纬度经度值上从php.BUt发送它在logcat上发送null而没有错误。

apiconnector我正在使用

package com.example.arpanagarwal.sba;

import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;

 import java.io.IOException;

 public class Apiconnector2 {

 public JSONArray getUser() {
    //int i = 1;


    String url;
    //url = "http://10.0.0.2/uservalidate.php?BookName="+temp;
    HttpEntity httpEntity = null;
    //ArrayList<NameValuePair> nameValuePairs1 = new                     ArrayList<NameValuePair>();
    //nameValuePairs1.add(new BasicNameValuePair("search","sys"));
    try {
        System.out.println("step 3");
        url = "http://askamit2012.netne.net/callemptybin.php";
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        //httpGet.setEntity(new UrlEncodedFormEntity(nameValuePairs1));

        HttpResponse httpResponse = httpclient.execute(httpGet);
        httpEntity = httpResponse.getEntity();

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

    } catch (IOException e) {
        e.printStackTrace();
    }
    JSONArray jsonArray = null;

    if (httpEntity != null) {
        try {
            String entityResponse = EntityUtils.toString(httpEntity);
            // String entityResponse = null;
            Log.e("Entity Response :", entityResponse);
            jsonArray = new JSONArray(entityResponse);
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    return jsonArray;
}

}

/ *****功能我在哪里呼叫连接器***** /

 public class callemptybin extends AsyncTask<Apiconnector2,Long,JSONArray>
{
    protected JSONArray doInBackground(Apiconnector2... params) {
        System.out.println("step1");
        return params[0].getUser();

    }
    @Override
    protected void onPreExecute()
    {
        System.out.println("step4");
        super.onPreExecute();
    }

    protected void onPostExecute(JSONArray jsonArray)
    {
        System.out.println("jsonarray=" + jsonArray);
        try{
            if(jsonArray==null)
            {
                System.out.println("null");
            }
            else {
                JSONObject json = jsonArray.getJSONObject(0);

                double lat1 = json.getDouble("latitude");
                double long1 = json.getDouble("longitude");

                LatLng jpnagar = new LatLng(lat1, long1);
                mMap.addMarker(new MarkerOptions().position(jpnagar).title("Bin Empty").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
            }
        }
        catch (JSONException e) {
            System.out.println("catch");
            e.printStackTrace();
        }
    }
}

/ ****按钮*** /

的功能

public  void onthrow(View view)
{
    if(view.getId()==R.id.button3 )
    {
        //throwtrash();
        System.out.println("step 00");
        new callemptybin().execute(new Apiconnector2());
        tt=1;
    }
}

/ ***** Php脚本**** /

<?php
if (isset($_SERVER['HTTP_ORIGIN'])) 
{
header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 86400');    // cache for 1 day
}

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') 
{

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
    header("Access-Control-Allow-Methods: GET, POST, OPTIONS");         

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
    header("Access-Control-Allow-Headers:                 {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

exit(0);
}


   $con = mysql_connect("mysql8.000webhost.com","********","*******");
    if(!$con)
    {
     die("Could not connect :".mysql_error());
    }
    mysql_select_db("*********",$con);


   //mysql_query($sql);
  mysql_query("set names 'utf8'"); 
   $result=mysql_query("select * from GPS where marker=1");
   while($row=mysql_fetch_assoc($result))
    {
     $output[]=$row;
    }
 print(json_encode($output));

   mysql_close($con);

?>

logcat result.plz因为发生多个函数而要小心logcat。我只检查一个按钮点击哪个有onthrow函数作为onclick intialized.check，其中json数组在logcat中打印为null。

04-14 21:16:51.387 1109-1109/? D/PhoneStatusBar: removeNotification      key=android.os.BinderProxy@42b5f3f0 keyCode=1119220720    old=StatusBarNotification(pkg=com.android.systemui user=UserHandle{0} id=252119    tag=null score=10: Notification(pri=1 contentView=com.android.systemui/0x1090064    vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null]))
04-14 21:17:38.757 6128-6128/com.example.arpanagarwal.sba I/System.out:    **jsonarray=null**
 04-14 21:17:38.767 6128-6128/com.example.arpanagarwal.sba I/System.out: null
 04-14 21:18:56.327 6819-6835/? D/AlertSyncService: onHandleIntent action =   null

Answer 1

帖子太长了，stackoverflow不喜欢它们。我有一些建议可以试试。

使用Rest Console测试服务器的预期响应。（Link for Google Chrome）
忘记DefaultHttpClient，使用Volley，欢迎来到现代世界！
保持简短。没有人关心onthrow()做什么。
要将JSON解析为Java对象，请使用Gson。

使用Volley意味着您将不再解析JSON，您不再需要创建AsyncTasks而不再需要为doInBackground()编写代码。我在android代码中设置GitHub gist来实现Volley。

从php发送数组到android studio

1 个答案: