错误：JSON解析器：解析数据时出错org.json.JSONException：字符0输入结束

我是新来开发一个android应用程序。我已经阅读了很多关于我所问的问题的相关文章，但帖子的提示或解决方案并未解决我的问题。当我运行我的应用程序我得到这个错误错误：JSON解析器：解析数据时出错org.json.JSONException：字符0输入结束

03-11 11:52:39.115 3209-3236/com.example.blue_sky.store E/JSON Parser: Error parsing data org.json.JSONException: End of input at character 0 of 
03-11 11:52:39.116 3209-3236/com.example.blue_sky.store E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 
                      Process: com.example.blue_sky.store, PID: 3209 
                      java.lang.RuntimeException: An error occured while executing doInBackground() 
                       at android.os.AsyncTask$3.done(AsyncTask.java:304) 
                       at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 
                       at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 
                       at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
                       at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
                       at java.lang.Thread.run(Thread.java:818) 
                      Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'org.json.JSONArray org.json.JSONObject.getJSONArray(java.lang.String)' on a null object reference 
                       at com.example.blue_sky.store.MainActivity$Store.doInBackground(MainActivity.java:76) 
                       at com.example.blue_sky.store.MainActivity$Store.doInBackground(MainActivity.java:53) 
                       at android.os.AsyncTask$2.call(AsyncTask.java:292) 
                       at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
                       at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)  
                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)  
                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)  
                       at java.lang.Thread.run(Thread.java:818)

听到的是我的MainAcivity：

package com.example.blue_sky.store; 

import android.app.ListActivity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import android.widget.Toast; 

import org.apache.http.NameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

public class MainActivity extends ListActivity { 

    private ProgressDialog pd; 
    //jparser 
    JSONparser jsoNparser = new JSONparser(); 
    ArrayList<HashMap<String,String>> p; 
    //s 
    static JSONArray jsonArray ; 
    String Url="http://127.0.0.1/store.php"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     p = new ArrayList<HashMap<String, String>>(); 
     new Store().execute(); 
     /* Store s =new Store(); 
     s.execute();*/ 
    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     super.onListItemClick(l, v, position, id); 
     String code = ((TextView)v.findViewById(R.id.tvPid)).getText().toString(); 
     Intent i = new Intent(MainActivity.this,ADD.class); 
     i.putExtra("pid",code); 
     startActivity(i); 
    } 

    class Store extends AsyncTask<String, String, String> { 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pd = new ProgressDialog(MainActivity.this); 
      pd.setMessage("LogIn"); 
      pd.show(); 
      //pd.dismiss(); 

     } 

     @Override 
     protected String doInBackground(String... params) { 
      List <NameValuePair> parms = new ArrayList<>(); // Building Parameters 
      //json 
      JSONObject jsonObject = jsoNparser.makeHttpRequest(Url,"GET",parms); 


      try { 
       // int t =jsonObject.getInt("t"); 
       int t =1; 
       if (t==1){ 
        jsonArray = jsonObject.getJSONArray("Store"); 
        for(int i = 0; i<jsonArray.length(); i++){ 
         //c 
         JSONObject jObject = jsonArray.getJSONObject(i); 
         String pid = jObject.getString("pid"); 
         String name = jObject.getString("name"); 
         String price = jObject.getString("price"); 
         String description = jObject.getString("description"); 

         HashMap<String,String> hashMap = new HashMap<String, String>(); 
         hashMap.put("pid",pid); 
         hashMap.put("name",name); 
         hashMap.put("price",price); 
         hashMap.put("description",description); 

         p.add(hashMap); 
        } 
       }else { 
        Toast.makeText(MainActivity.this,"اطلاعاتی یافت نشد!!",Toast.LENGTH_LONG).show(); 
       } 
      } catch (JSONException e) { 
       // e.printStackTrace(); 
       System.out.println("Error " + e.getMessage()); 
       return null; 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(String s) { 
      super.onPostExecute(s); 

      pd.cancel(); 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        ListAdapter listAdapter = new SimpleAdapter(MainActivity.this,p,R.layout.item_list, 
          new String[]{"pid","name","price","description","store"}, 
          new int[]{R.id.tvPid,R.id.tvName,R.id.tvPrice,R.id.tvDisc}); 
        setListAdapter(listAdapter); 
       } 
      }); 
     } 

    } 
    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     if (pd != null) { 
      pd.dismiss(); 
      pd = null; 
     } 
    } 
}

，这是我添加类：

package com.example.blue_sky.store; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.List; 

/** 
* Created by Blue_Sky on 3/11/2017. 
*/ 

public class ADD extends Activity { 
    private String cod; 
    private ProgressDialog pd; 
    EditText InputName,InputCode,InputNumber; 
    Button Send; 
    JSONparser jparser = new JSONparser(); 
    private String url; 

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

     InputName = (EditText)findViewById(R.id.edInputName); 
     InputCode = (EditText)findViewById(R.id.edInputCode); 
     InputNumber = (EditText)findViewById(R.id.edInputNumber); 
     Send = (Button)findViewById(R.id.btnSend); 

     setContentView(R.layout.add); 
     Bundle input = getIntent().getExtras(); 
     cod = input.getString("pid"); 
     Send.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       new load().execute(); 
      } 
     }); 
    } 
    class load extends AsyncTask<String,String,String>{ 

     public void AttemptLogin(String name, String code, String number){ 
      name = InputName.getText().toString(); 
     } 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pd = new ProgressDialog(ADD.this); 
      pd.setMessage("LogIn"); 
      pd.show(); 

     } 

     String code = InputCode.getText().toString(); 
     String name = InputName.getText().toString(); 
     String number = InputNumber.getText().toString(); 

     @Override 
     protected String doInBackground(String... params) { 
      List<NameValuePair> parms = new ArrayList<NameValuePair>(); 
      parms.add(new BasicNameValuePair("name",name)); 
      parms.add(new BasicNameValuePair("code",code)); 
      parms.add(new BasicNameValuePair("number",number)); 
      parms.add((new BasicNameValuePair("cod",cod))); 

      JSONObject Json = jparser.makeHttpRequest(url,"POST",parms); 

      try { 
       int t = Json.getInt("t"); 
       if(t == 1){ 
        Intent in = new Intent(ADD.this,MainActivity.class); 
        startActivity(in); 
       }else { 
        Toast.makeText(getApplicationContext(),"خطایی رخ داده!!",Toast.LENGTH_LONG).show(); 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(String s) { 
      super.onPostExecute(s); 
      pd.dismiss(); 
     } 
    } 
}

和JSONParser类：

package com.example.blue_sky.store; 

import android.util.Log; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.client.utils.URLEncodedUtils; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 

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

public class JSONparser { 

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

    // constructor 
    public JSONparser() { 

    } 

    // function get json from url 
    // by making HTTP POST or GET mehtod 
    public JSONObject makeHttpRequest(String url, String method, 
             List<NameValuePair> params) { 

     // Making HTTP request 
     try { 

      // check for request method 
      if(method == "POST"){ 
       // request method is POST 
       // defaultHttpClient 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost(url); 
       httpPost.setEntity(new UrlEncodedFormEntity(params)); 

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

      }else if (method == "GET") { 
       // request method is GET 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       String paramString = URLEncodedUtils.format(params, "utf-8"); 
       url += "?" + paramString; 
       HttpGet httpGet = new HttpGet(url); 

       HttpResponse httpResponse = httpClient.execute(httpGet); 
       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; 

    } 
}

来源

2017-03-11 m.moghadam

可能重复[什么是NullPointerException，以及如何解决它？]（http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-doi-i-fix - ） –

嗨，显示你的JSON。 –

我想，你的PHP文件返回null。而你的jsonObject为null。

打印响应：

 if (BuildConfig.DEBUG) { 

      Log.d("TAG", "Response : "+jsonObject); 
     }

始终使用调试检查，如果你要在Play商店中启动应用。它不会打印任何日志。

来源

2017-03-11 18:21:12 Spykaran

错误：JSON解析器：解析数据时出错org.json.JSONException：字符0输入结束

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