我正在使用http方法更新android应用程序中的数据库，但我得到了以下错误

Question

11-10 13:32:47.398: E/AndroidRuntime(2155)：致命例外:主11-10 13:32:47.398: E/AndroidRuntime(2155)：android.os.NetworkOnMainThreadException 11-10 13:32:47.398: E/AndroidRuntime(2155)：at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 11-10 13:32:47.398: E/AndroidRuntime(2155)：at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 11-10 13：32:47.398: e/AndroidRuntime(2155年)：java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 11-10 13:32:47.398: E/AndroidRuntime(2155)：at java.net.InetAddress.getAllByName(InetAddress.java:214)

公共类UpdatingDatabase扩展AsyncTask时出错

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

正如我在注释中指出的，您需要使用线程来获取网络，并确保不对UI线程执行任何网络访问，而是在异步任务中进行访问。

您必须将onClick按钮中的代码移动到AsynTask..。

应该如下所示。

编辑！

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
}

现在它应该是这样的，它将修复您的错误。如果成功了，请告诉我

编辑：

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

编辑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
                        }

                    }

                  }
                 }