android - 使用 sharedpreferences 在 android 中进行 session 管理

Question

您好，我通过 soap webservices 成功开发了一个带有 mysql 数据库的登录表单。在这里我希望进行 session 管理。但是我无法开发。所以请帮助我。当我填写用户名和密码时，这意味着成功它是去下一个 Activity 。下一个 Activity 必须显示用户名。如果我点击注销按钮意味着它正在移动到登录表单。现在我回去意味着它只是重定向到登录页面......没有去显示的用户名 Activity 。请指导我。

我的代码是:

package com.androidlogin.ws;
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;

 public class AndroidLoginExampleActivity extends Activity {
 private final String NAMESPACE = "http://ws.userlogin.com";
 private final String URL = "http://111.223.128.10:8085/AndroidLogin/services/Login?wsdl";
 private final String SOAP_ACTION = "http://ws.userlogin.com/authentication";
 private final String METHOD_NAME = "authentication";
 /** Called when the activity is first created. */
 @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    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.VER11);
    envelope.setOutputSoapObject(request);
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

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

           TextView result = (TextView) findViewById(R.id.tv_status);
           result.setText(response.toString());
       if(status.equals("Success!"))
               {

                   //   ADD  to save  and  read next time
                       String strUserName = userName.getText().toString().trim();
                       String strPassword = userPassword.getText().toString().trim();
                       if (null == strUserName || strUserName.length() == 0)
                                   {
                           //  showToast("Enter Your Name");
                         userName.setError( "username is required!" );
isUserValidated = false;
                       }
 if (null == strPassword || strPassword.length() == 0)
                                   {
                               //      showToast("Enter Your Password");
 isPasswordValidated = false;
                         userPassword.setError( "password is required!" );
                       } 
 if(isUserValidated = true && isPasswordValidated == true)
                                   {

                           if (chkRememberMe.isChecked())
                                           {
                               SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
                               loginPreferences.edit().putString(USERNAME, strUserName).putString(PASSWORD, strPassword).commit();
                           } else
                                           {
                               SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
                               loginPreferences.edit().clear().commit();
                                           }
        }

        if(isUserValidated && isPasswordValidated)
     {
               Intent intent = new Intent(Login.this,HomePage.class);
                  **intent.putExtra("username",userName.getText().toString());**
                  startActivity(intent);
         }
      else
       {
     // what ever you want to do if the data in the EditText is not validated.
    //Maybe restart the same intent ?    
      // Intent i = new Intent(getApplicationContext(), Login.class);    startActivity(i);


         }

                                   }

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



    catch(Exception e){

    }
   }

  }

如何在 dis android 登录表单应用程序中使用共享首选项创建 session 概念。

谢谢

Answer 1

如果您使用 SharedPreferences 和 Activity 生命周期，您可以轻松地实现这一点。

假设您有 Activity A - 显示登录 Activity，和 Activity B - 注销 Activity + 显示用户名 Activity。

在 Activity A 中，在您的 loginAction() 方法中，放置一个 bool 标志以跟踪用户是否已登录。如果用户有效，执行登录操作，将该标志设置为 TRUE，然后启动您的 Activity B。

在 Activity B 的 onResume() 方法中，每次检查标志是 TRUE 还是 FALSE。如果标志为 TRUE，什么都不做，如果标志为 FALSE，则启动 Activity A(返回登录屏幕)。像这样的东西:

@Override
protected void onResume() {
    super.onResume();

    boolean isLogged = <yourSharedPrefs>.getBoolean(IS_LOGGED, Boolean.FALSE);

    if (!isLogged) {
                    //here start your login Activity
        startActivity(new Intent(this, ActivityA.class));
    }

}

Activity B 中的注销按钮应将标志设置为 FALSE，然后启动 Activity A。

这样，当您点击后退按钮时，您的应用将加载 Activity B，但 onResume() 中的检查将检测到用户未登录，并且 Activity A 将开始。