android json php示例不起作用

我是android JSON新手，从我的服务器数据库表中获取数据时遇到问题。我需要在我的android页面id上显示，在settext上显示名称和地址 但我不是通过JSON从服务器获取数据。以下是我的完整代码：

这是我的JSON文件：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

public JSONObject getJSONFromUrl(String url) {

    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();

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

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;

}
}

以下是我的主要活动：

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.my.data1.JSONParser;

 public class Tab1Activity extends Activity {

//URL to get JSON Array
   private static String url = "http://app-developments.com/Jasmita/Address-          book/Get_product_details.php";

//JSON Node Names
private static final String TAG_Address_Book = "Address_Book";
private static final String TAG_ID = "Id";
private static final String TAG_NAME = "Name";
private static final String TAG_ADD = "Address";

JSONArray Address_Book = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_tab1);
  Toast.makeText(getApplicationContext(), "Welcome", 4000).show();
    // Creating new JSON Parser
   JSONParser jParser = new JSONParser();

    // Getting JSON from URL
     JSONObject json = jParser.getJSONFromUrl(url);

     try {
        // Getting JSON Array
        Address_Book = json.getJSONArray(TAG_Address_Book);
        JSONObject c = Address_Book.getJSONObject(0);

        // Storing  JSON item in a Variable
        String id = c.getString(TAG_ID);
        String name = c.getString(TAG_NAME);
        String add = c.getString(TAG_ADD);

        //Importing TextView
        final TextView uid = (TextView)findViewById(R.id.ID1);
        final TextView name1 = (TextView)findViewById(R.id.name1);
        final TextView email1 = (TextView)findViewById(R.id.add1);

        //Set JSON Data in TextView
        uid.setText(id);
        name1.setText(name);
        email1.setText(add);

    } catch (JSONException e) {
    e.printStackTrace();
    //Toast.makeText(getApplicationContext(),"Exception is: " +e,    4000).show();
}

}

}

这是我的php文件：

<?php

/*
* Following code will get single product details
* A product is identified by product id (pid)
*/



  // array for JSON response
   $response = array();


  // include db connect class
   require_once __DIR__ . '/db_connect1.php';

  // connecting to db
 $db = new DB_CONNECT();

   // check for post data



    // get a product from products table
      $result = mysql_query("SELECT * FROM Address_Book") or                   die(mysql_error());


             if (mysql_num_rows($result) > 0) {
                    $response["Address_Book"] = array();

          while ($row = mysql_fetch_array($result)) {
    // temp user array
    $Address_Book = array();
    $Address_Book["Id"] = $row["Id"];
    $Address_Book["Name"] = $row["Name"];
    $Address_Book["Address"] = $row["Address"];



    // push single product into final response array
    array_push($response["Address_Book"], $Address_Book);
     }
       // success            // success
        $response["success"] = 1;

        // echoing JSON response
      echo json_encode($response);
     } else {
      // no products found
       $response["success"] = 0;
      $response["message"] = "No products found";

      // echo no users JSON
       echo json_encode($response);
         }

            ?>

---

您遗漏了很多信息和代码，但我仍将根据我认为您的问题来回答您的问题：

据我所知，作为数据库GET请求的php文件工作正常，但无法在Android上调用它

当我第一次开始使用Android时，我在GET请求方面也遇到了一些问题，所有我本应该使用教程中包含的类都被弃用了

我终于四处搜索，做了一些有用的东西，并在我的粘贴箱上保存了一个我所做的样本。我将与您分享如何在Android上发出GET请求，您所要做的就是将其应用到您的项目中

 public class Main2Activity extends AppCompatActivity {

public static String URL;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    URL = "http://The-URL-To-Your-PHP-File";
    ConnectToDatabase connect = new ConnectToDatabase();
    Thread th = new Thread(connect);
    th.start();
}

  class ConnectToDatabase implements Runnable {

    public void run() {
        Log.d("link", URL);
        StringBuilder result = new StringBuilder();
        try {
            URL url = new URL(URL);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            InputStream in = new BufferedInputStream(urlConnection.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line;
            while ((line = reader.readLine()) != null) {
                result.append(line);
            }
            urlConnection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }

        /*
            RESULT - DO WHATEVER WITH IT
        */
        Log.d("result", result.toString());


    }
}

---

这应该行得通。如果没有，那么，看在上帝的份上，告诉我们错误信息是什么。

您的完整代码在哪里？？我看不见。。！！你用卷发吗？你为什么不发布你的代码？等待你的完整代码…你在LogCat中有任何异常吗？没有…它没有连接到数据库我在我的主要活动中应用了它？请澄清我正在使用的eclipse@z.al在执行代码的任何活动上使用它。我当时的名字叫Main2Activity，因为我想不起它的名字。不管怎么说，你可以在你的主要活动中很好地使用它。空指针异常：lock==null我在应用你的code@z.al这可能意味着中的InputStream为空。这可能意味着您的php文件出错，或者您只是错误地实现了我的代码。