コードを実行すると致命的な例外が発生する

Question

次のコードを使用しましたが、コードを実行すると致命的な例外が発生します。これを解決するために私を案内してください。

mainactivity.java：

package com.example.admin.sample; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent;import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.Button; 
import android.widget.EditText; 
import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends Activity { 

EditText txtName; 
EditText txtDept; 
EditText txtBatch; 
EditText txtSem; 
EditText txtReg; 
EditText txtSec; 
EditText txtMail; 
EditText txtCreatedAt; 
Button btnSave; 
// Button btnDelete; 

String rid; 

// Progress Dialog 
private ProgressDialog pDialog; 

// JSON parser class 
JSONParser jsonParser = new JSONParser(); 

// single product url 
private static final String url_product_detials = "http://ishakthiwatt.esy.es/Student.php"; 


// JSON Node names 
private static final String TAG_SUCCESS = "success"; 
private static final String TAG_STUDENT = "student"; 
private static final String TAG_RID = "RollNo"; 
private static final String TAG_NAME = "Name"; 
private static final String TAG_DEPT = "Dept"; 
private static final String TAG_BATCHYR = "BatchYear"; 
private static final String TAG_SEM = "Sem"; 
private static final String TAG_REGULATION = "Reg"; 
private static final String TAG_SECTION = "Section"; 
private static final String TAG_MAILID = "MailId"; 



@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    // save button 
    btnSave = (Button) findViewById(R.id.btnSave); 


    // getting product details from intent 
    Intent i = getIntent(); 

    // getting product id (pid) from intent 
    rid= i.getStringExtra(TAG_RID); 

    // Getting complete product details in background thread 
    new GetProductDetails().execute(); 

} 

/** 
* Background Async Task to Get complete product details 
* */ 
class GetProductDetails extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread Show Progress Dialog 
    * */ 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(MainActivity.this); 
     pDialog.setMessage("Loading product details. Please wait..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true); 
     pDialog.show(); 
    } 

    /** 
    * Getting product details in background thread 
    * */ 
    protected String doInBackground(String... params) { 

     // updating UI from Background Thread 
     runOnUiThread(new Runnable() { 
      public void run() { 
       // Check for success tag 
       int success; 
       try { 
        // Building Parameters 
        ArrayList<NameValuePair> params = new ArrayList<NameValuePair>(); 
        params.add(new BasicNameValuePair("RollNo", rid)); 

        // getting product details by making HTTP request 
        // Note that product details url will use GET request 
        JSONObject json = jsonParser.makeHttpRequest(
          url_product_detials, "GET", params); 

        // check your log for json response 
        Log.d("Single Product Details", json.toString()); 

        // json success tag 
        success = json.getInt(TAG_SUCCESS); 
        if (success == 1) { 
         // successfully received product details 
         JSONArray productObj = json 
           .getJSONArray(TAG_STUDENT); // JSON Array 

         // get first product object from JSON Array 
         JSONObject product = productObj.getJSONObject(0); 

         // product with this pid found 
         // Edit Text 
         txtName = (EditText) findViewById(R.id.inputName); 
         txtDept = (EditText) findViewById(R.id.inputDept); 
         txtBatch = (EditText) findViewById(R.id.inputbtchyr); 
         txtSem = (EditText) findViewById(R.id.inputsem); 
         txtReg = (EditText) findViewById(R.id.inputreg); 
         txtSec = (EditText) findViewById(R.id.inputsection); 
         txtMail = (EditText) findViewById(R.id.inputMail); 



         // display product data in EditText 
         txtName.setText(product.getString(TAG_NAME)); 
         txtDept.setText(product.getString(TAG_DEPT)); 
         txtSem.setText(product.getString(TAG_SEM)); 
         txtBatch.setText(product.getString(TAG_BATCHYR)); 
         txtReg.setText(product.getString(TAG_REGULATION)); 
         txtSec.setText(product.getString(TAG_SECTION)); 
         txtMail.setText(product.getString(TAG_MAILID)); 

        }else{ 
         // product with pid not found 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 

     return null; 
    } 

    /** 
    * After completing background task Dismiss the progress dialog 
    * **/ 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog once got all details 
     pDialog.dismiss(); 
    } 
} 

}

JAONParser.java：

package com.example.admin.sample; 
    import android.util.Log; 
    import com.loopj.android.http.AsyncHttpClient; 
    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.HttpClient; 
    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.JSONArray; 
    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.ArrayList; 

    public class JSONParser { 


static InputStream is = null; 
static JSONObject jObj = null; 
static JSONArray jArr = null; 
static String json = ""; 
static String error = ""; 

// constructor 
public JSONParser() { 

} 

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

    // Making HTTP request 
    try { 

     // check for request method 
     if(method.equals("POST")){ 
      // request method is POST 
      // defaultHttpClient 
      HttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(params)); 
      try { 
       Log.e("API123"," " +convertStreamToString(httpPost.getEntity().getContent())); 
       Log.e("API123",httpPost.getURI().toString()); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      Log.e("API123"," "+httpResponse.getStatusLine().getStatusCode()); 
      error= String.valueOf(httpResponse.getStatusLine().getStatusCode()); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 

     }else if(method.equals("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(); 
     Log.d("API123",json); 
    } 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); 
     jObj.put("error_code",error); 
    } catch (JSONException e) { 
     Log.e("JSON Parser","Error parsing data " + e.toString()); 
    } 

    // return JSON String 
    return jObj; 

} 

private String convertStreamToString(InputStream is) throws Exception { 
    BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
    StringBuilder sb = new StringBuilder(); 
    String line = null; 
    while ((line = reader.readLine()) != null) { 
     sb.append(line); 
    } 
    is.close(); 
    return sb.toString(); 
} 

}

私はこのエラーを取得しています：

FATAL EXCEPTION: main 
     Process: com.example.admin.sample, PID: 27267 
     android.os.NetworkOnMainThreadException 
     at 
     android.os.StrictMode $AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1288) 
     at java.net.InetAddress.lookupHostByName(InetAddress.java:432) 
     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:253) 
     at java.net.InetAddress.getAllByName(InetAddress.java:215) 
     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:147) 
     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:169) 
     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:124) 
     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:366) 
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627) 
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:538) 
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:516) 
     at com.example.admin.sample.JSONParser.makeHttpRequest(JSONParser.java:81) 
     at com.example.admin.sample.MainActivity$GetProductDetails$1.run(MainActivity.java:114) 
     at android.os.Handler.handleCallback(Handler.java:815) 
     at android.os.Handler.dispatchMessage(Handler.java:104) 
     at android.os.Looper.loop(Looper.java:207) 
     at android.app.ActivityThread.main(ActivityThread.java:5740) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:766) 
     I/Process: Sending signal. PID: 27267 SIG: 9` 

Answer 1

このエラーを解決するために私を導いてください、あなたはあなたのJSONParserにライン81上のClientProtocolExceptionを取得しているように見えますマニフェスト

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