java - 使 Android 应用程序在一个 session 中连接

Question

我正在制作这个 Android 应用程序，您的用户必须登录才能进入该应用程序，我正在通过网络服务将我的应用程序连接到数据库我成功创建了登录页面，但是，我的问题是，用户如何使用相同的 session ID 进入第二个页面，以及系统如何检索在其他页面登录的用户详细信息这是我的login.java代码

import android.R.string;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
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 org.ksoap2.transport.HttpsTransportSE;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.view.View.OnClickListener;

public class Login extends ActionBarActivity   {

    private static final String NAMESPACE = "***"; //WHAT IS A NAMESPACE
    private static final String URL = "***"; //removed HTTPS because I'm making a https call below
    private static final String METHOD_NAME = "login";
    private static final String SOAP_ACTION =  NAMESPACE + "/" + METHOD_NAME; //in wsdl it's nothing

    EditText usersusername, userspassword;
    Button LB;

    @Override 
    protected void onCreate(Bundle savedInstanceState) { // WHAT DOES PROTECTED VOID MEAN? CAN YOU RENAME ANYTHING
        //SUCH AS SAVEDINSTANCESTATE OR IS IT ALWAYS LIKE THAT? 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login); //CAN YOU HAVE TWO ACTIVITIES TO ONE LAYOUT?
       usersusername = (EditText)findViewById(R.id.editusername);
       userspassword = (EditText)findViewById(R.id.editusername);
       LB = (Button) findViewById(R.id.loginbutton);
       LB.setOnClickListener(new View.OnClickListener() {

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

      }
     });




    }


    private void loginAction(){
            SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
            usersusername = (EditText)findViewById(R.id.editusername);
            userspassword = (EditText)findViewById(R.id.editusername);
            String user_Name = usersusername.getText().toString();
            String user_Password = userspassword.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.VER11); // Declare the version of the soap request
           envelope.setOutputSoapObject(request);
           HttpTransportSE aht = new HttpTransportSE(URL);

           try {

                //URL = www.servicedeskattach.datacom.co.nz/axis/services/USD_R11_WebService?wsdl


                aht.call(SOAP_ACTION, envelope);  //this is the actual part that calls the web service
                String requestDumpString = aht.requestDump;
                String responseDumpString = aht.responseDump;




          //Get the soapresult from the envelope body
         //     SoapObject result = (SoapObject)envelope.bodyIn;
                SoapPrimitive response =(SoapPrimitive)envelope.getResponse();
                String status = response.toString(); // Result string
                TextView result = (TextView) findViewById(R.id.tv_status);
                   result.setText(response.toString());

                   if(status.equals("Success!"))
                    {
                       Intent intent = new Intent(Login.this,Dashboard.class);
                       intent.putExtra("username",usersusername.getText().toString());
                       startActivity(intent);


                    }
                   else
                    {
                       Intent i = new Intent(getApplicationContext(), Login.class);
                       startActivity(i);
                    }



           }
           catch (Exception e){

           }






        } 


    } 

Answer 1

这是跨 Activity 持久保存数据的一个很好的例子。为此，最常见的示例是使用“首选项”文件。如果您不希望数据持续很长时间，您可以在服务器端控制它(使 cookie 或 session ID 过期):

How do I get the SharedPreferences from a PreferenceActivity in Android?

使用 Intent 传递数据还不错，但如果有电话打入并且应用程序移至后台，Android 可能会终止并重新启动您的应用程序，从而导致数据丢失。这听起来可能“安全”，但情况也可能是电话只是响铃或用户回复短信，如果这种情况经常发生，您的用户可能会感到恼火。

数据库通常是多余的，除非您已经拥有一个数据库和 USER 对象等。