我正在使用http post方法更新android應用程序中的數據庫，但出現以下錯誤

Question

11-10 13：32：47.398：E / AndroidRuntime（2155）：致命異常：主11-10 13：32：47.398：E / AndroidRuntime（2155）：android.os.NetworkOnMainThreadException 11-10 13：32：47.398： E / AndroidRuntime（2155）：位於android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork（StrictMode.java:1117）11-10 13：32：47.398：E / AndroidRuntime（2155）：位於java.net.InetAddress.lookupHostByName（InetAddress .java：385）11-10 13：32：47.398：E / AndroidRuntime（2155）：在java.net.InetAddress.getAllByNameImpl（InetAddress.java:236）11-10 13：32：47.398：E / AndroidRuntime（2155） ）：位於java.net.InetAddress.getAllByName（InetAddress.java:214）

公共類UpdatingDatabase上的錯誤擴展了AsyncTask

package com.nikhil.svs;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class Register extends MainActivity {

    EditText reg,pwd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

         reg=(EditText) findViewById(R.id.editusername);
         pwd=(EditText) findViewById(R.id.editpassword);
         Button register=(Button) findViewById(R.id.register);
        register.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                new UpdatingDatabase().execute();
                }

                public class UpdatingDatabase extends AsyncTask<String, String, String>
                {
                 protected String doInBackground(String... arg0) { //add this line
                 HttpClient httpclient = new DefaultHttpClient();
                            HttpPost httppost = new HttpPost("http://nikhilvaddepati.tk.hostinghood.com/test.php");
                            String a=reg.getText().toString();
                            String b=pwd.getText().toString();

                            try {
                                // Add your data
                                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                                nameValuePairs.add(new BasicNameValuePair("regno", ""+a));
                                nameValuePairs.add(new BasicNameValuePair("pwd",""+b));                  
                                httppost.setEntity((HttpEntity) new UrlEncodedFormEntity(nameValuePairs));

                                // Execute HTTP Post Request
                                HttpResponse response = httpclient.execute(httppost);

                            }catch (ClientProtocolException e) {
                                // TODO Auto-generated catch block
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                            }

                        }

                public void execute() {
                    // TODO Auto-generated method stub

                }
                      }// and this brackets
                        });
    }

}

Answer 1

如我在評論中所述，您需要使用線程來獲得網絡，並確保您不對UI Thread進行任何網絡訪問，而要在異步任務中執行

您必須將onClick按鈕中的代碼移動到AsynTask ...

它應該如下所示。

編輯！

public void onClick(View v) {
new UpdatingDatabase().execute();
}

public class UpdatingDatabase extends AsyncTask<String, String, String>
{
 protected String doInBackground(String... arg0) { //add this line
 HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://nikhilvaddepati.tk.hostinghood.com/test.php");
            String a=reg.getText().toString();
            String b=pwd.getText().toString();

            try {
                // Add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("regno", ""+a));
                nameValuePairs.add(new BasicNameValuePair("pwd",""+b));                  
                httppost.setEntity((HttpEntity) new UrlEncodedFormEntity(nameValuePairs));

                // Execute HTTP Post Request
                HttpResponse response = httpclient.execute(httppost);

            }catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
            } catch (IOException e) {
                // TODO Auto-generated catch block
            }

        }
      }// and this brackets
}

現在應該是這樣，它將解決您的錯誤。 請通知我是否可行

編輯：

final EditText reg, pwd;

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.register);

    reg=(EditText) findViewById(R.id.editusername);


    pwd=(EditText) findViewById(R.id.editpassword);

    ...// complete with the code

編輯2：

package com.nikhil.svs;

 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;

 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.HttpPost;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.message.BasicNameValuePair;

 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;

 public class Register extends MainActivity {

EditText reg,pwd;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.register);

     reg=(EditText) findViewById(R.id.editusername);
     pwd=(EditText) findViewById(R.id.editpassword);
     Button register=(Button) findViewById(R.id.register);
    register.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            new UpdatingDatabase().execute();
            }
          });
         }

            public class UpdatingDatabase extends AsyncTask<String, String, String>
            {
             protected String doInBackground(String... arg0) { //add this line
             HttpClient httpclient = new DefaultHttpClient();
                        HttpPost httppost = new HttpPost("http://nikhilvaddepati.tk.hostinghood.com/test.php");
                        String a=reg.getText().toString();
                        String b=pwd.getText().toString();

                        try {
                            // Add your data
                            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                            nameValuePairs.add(new BasicNameValuePair("regno", ""+a));
                            nameValuePairs.add(new BasicNameValuePair("pwd",""+b));                  
                            httppost.setEntity((HttpEntity) new UrlEncodedFormEntity(nameValuePairs));

                            // Execute HTTP Post Request
                            HttpResponse response = httpclient.execute(httppost);

                        }catch (ClientProtocolException e) {
                            // TODO Auto-generated catch block
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                        }

                    }

                  }
                 }