Question

我正在尝试使用soap从mysql数据库中获取用户名和密码值。但我得到'android.os.NetworkOnMainThreadException'，请告诉我如何使用AsyncTask来避免这种异常。

package com.example.androidloginexampleactivity;

import java.io.IOException;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidLoginExampleActivity extends Activity {
    private final String NAMESPACE = "http://10.0.2.2:80/urn:stockserver";
    private final String URL = "http://10.0.2.2:80/stockserver1.php?wsdl";

    //private final String URL = " http://10.0.2.2:8080/WebApplication2/Login?Tester";
    private final String SOAP_ACTION = "http://10.0.2.2:80/urn:stockserver#getStockQuote";
    private final String METHOD_NAME = "getStockQuote";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_android_login_example);
        Button login = (Button) findViewById(R.id.btn_login);
        login.setOnClickListener(new View.OnClickListener() {

            public void onClick(View arg0) {
                loginAction();
            }
        });
    }

    private void loginAction(){
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        EditText userName = (EditText) findViewById(R.id.tf_userName);
        String user_Name = userName.getText().toString();
        EditText userPassword = (EditText) findViewById(R.id.tf_password);
        String user_Password = userPassword.getText().toString();

        //Pass value for userName variable of the web service
        PropertyInfo unameProp =new PropertyInfo();
        unameProp.setName("userName");//Define the variable name in the web service method
        unameProp.setValue(user_Name);//set value for userName variable
        unameProp.setType(String.class);//Define the type of the variable
        request.addProperty(unameProp);//Pass properties to the variable

        //Pass value for Password variable of the web service
        PropertyInfo passwordProp =new PropertyInfo();
        passwordProp.setName("password");
        passwordProp.setValue(user_Password);
        passwordProp.setType(String.class);
        request.addProperty(passwordProp);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER10);
        envelope.setOutputSoapObject(request);
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

        try{
            androidHttpTransport.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive)envelope.getResponse();

            TextView result1 = (TextView) findViewById(R.id.tv_status);
            result1.setText(response.toString());
            Toast.makeText(getApplicationContext(), response.toString(), 5).show();

        }
        catch(Exception e){
            Toast.makeText(getApplicationContext(), e.toString(), 5).show();


        }
    }

}

Answer 1

将您的LoginAction转换为扩展AsyncTask的内部类。覆盖preexecute方法以完成所有设置。使用onexecute方法进行网络通信。使用postexecute方法对结果进行任何处理。

这是一个教程：http://codeoncloud.blogspot.com/2013/07/android-web-service-access-using-async.html

Answer 2

从Android 3.0开始，您无法在主线程上使用网络连接。您最好使用doInBackground创建一个AsynTask来执行httpget。

通过：@ marshallino16

请参阅this帖子。

android与mysql数据库接口

2 个答案: