2017-02-28 56 views
1

重新開放問題 (上一頁[未解]:Shared Preference not holding session (Android K)共享偏好不是在Android的ķ工作,下面

我有它使用共享偏好會話管理的項目。代碼的一切都很好,但真正令人討厭的是,應用程序在Android Lollipop及以上版本中保持會話,但不幸的是,Android Kitkat和以下版本不支持此功能。每當應用程序關閉時,會話都會丟失,您必須重新登錄。以下是代碼,我使用:

Session.java

package com.saptak.disputesession; 
import android.content.Context; 
import android.content.SharedPreferences; 
import java.util.HashMap; 
/** 
* Created by Saptak Das on 27-02-2017. 
*/ 

public class Session { 

    SharedPreferences sharedPreferences; 
    SharedPreferences.Editor editor; 

    Context context; 

    public static String KEY_FNAME="namef"; 
    public static String KEY_LNAME="namel"; 
    public static String IS_LOGIN; 

    public Session(Context context) { 
     this.context = context; 
     sharedPreferences=context.getSharedPreferences("userdetails",0); 
     editor=sharedPreferences.edit(); 
    } 

    public void CreateLoginSession(String fname,String lname) 
    { 
     editor.putString(KEY_FNAME,fname); 
     editor.putString(KEY_LNAME,lname); 
     editor.putString(IS_LOGIN,"logged"); 
     editor.commit(); 
    } 

    public HashMap<String,String> getdetails() 
    { 
     HashMap<String,String> details=new HashMap<>(); 
     details.put(KEY_FNAME,sharedPreferences.getString(KEY_FNAME,null)); 
     details.put(KEY_LNAME,sharedPreferences.getString(KEY_LNAME,null)); 
     return details; 
    } 

    public boolean loginstatus() 
    { 
     if(sharedPreferences.getString(IS_LOGIN,"unlogged").equals("logged")) 
     { 
      return true; 
     } 
     else 
     { 
      return false; 
     } 
    } 
    public void logoutac() 
    { 
     editor.clear(); 
     editor.commit(); 
    } 
} 

Login.java

package com.saptak.disputesession; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 

/** 
* Created by Saptak Das on 27-02-2017. 
*/ 

public class Login extends Activity { 

    Button login; 
    EditText first,last; 

    Session session; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.layout); 
     session=new Session(getApplicationContext()); 
     login=(Button)findViewById(R.id.log); 
     first=(EditText)findViewById(R.id.fname); 
     last=(EditText)findViewById(R.id.lname); 
     login.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       session.CreateLoginSession(first.getText().toString(),last.getText().toString()); 
       startActivity(new Intent(getApplicationContext(), MainActivity.class)); 
       finish(); 
      } 
     }); 
    } 
} 

MainActivity.java

package com.saptak.disputesession; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 

import java.util.HashMap; 

public class MainActivity extends AppCompatActivity { 

    Session session; 
    Boolean flag; 

    TextView tf,tl; 

    Button logout; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     session=new Session(getApplicationContext()); 
     tf=(TextView)findViewById(R.id.xfname); 
     tl=(TextView)findViewById(R.id.xlname); 
     logout=(Button)findViewById(R.id.xlogout); 
     flag=session.loginstatus(); 
     if(flag==false) 
     { 
      startActivity(new Intent(getApplicationContext(),Login.class)); 
      finish(); 
     } 
     HashMap<String,String> details=session.getdetails(); 
     tf.setText(details.get(Session.KEY_FNAME)); 
     tl.setText(details.get(Session.KEY_LNAME)); 
     logout.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       session.logoutac(); 
       startActivity(new Intent(getApplicationContext(),Login.class)); 
       finish(); 
      } 
     }); 
    } 
} 

這個問題現在讓我感到緊張,因爲應用程序是完全編碼的,請幫助我。提前致謝!

請注意,問題不在於刪除會話。每次我關閉應用程序時,會話都會記錄下來。而這個問題只在Android的奇巧及以下的情況下,工作正常的是Android Lollipop以上

+0

加上'editor.remove (KEY_FNAME); editor.remove(KEY_LNAME); editor.remove(IS_LOGIN);'這在你的'CreateLoginSession'之前'editor.putString(KEY_FNAME,fname);' –

+0

@IntelliJAmiya試過了,沒有任何幫助。問題依然存在 –

回答

1

字符串中Session.java IS_LOGIN應該有這樣一個鍵值:

public static String IS_LOGIN="mykeyvalue"; 
+0

馬虎的錯誤花費你 –

+1

@IntelliJAmiya認真地對待,我覺得自己打擊:P –