如何保存和檢索sharedpreferences中的多個值？

我有2個活動 1.Register.java 2.SecureXActivity.java 在註冊活動中，我正在使用共享首選項註冊我的應用程序。我已經使用共享偏好來僅顯示註冊活動一次。現在我的要求是從註冊活動取得用戶名，註冊時只會顯示一次，並將其保存在SecureXActivity活動中，註冊後只有用戶可以看到該活動。所以請在這方面幫助我？我是android新手。如何保存和檢索sharedpreferences中的多個值？

我的代碼下面給出

public class Register extends Activity 
{ 
public static final String PREFS_NAME = "LoginPrefs"; 
public static final String USER_NAME = "USER"; 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.register); 

    /* 
    * Check if we successfully logged in before. 
    * If we did, redirect to home page 
    */ 
    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
    if (settings.getString("logged", "").toString().equals("logged")) 
    { 
     Intent intent = new Intent(Register.this, SecureXActivity.class); 
     startActivity(intent); 
    } 

    Button b = (Button) findViewById(R.id.btnRegister); 
    b.setOnClickListener(new OnClickListener() 
    { 
     public void onClick(View v) { 
      EditText username = (EditText) findViewById(R.id.reg_employeeid); 
      EditText password = (EditText) findViewById(R.id.reg_password); 
      String welcm ="Welcome"; 
      String space = " "; 
      EditText firstname = (EditText)findViewById(R.id.reg_firstname); 
      EditText lastname = (EditText)findViewById(R.id.reg_lastname); 
      String getfirstname = firstname.getText().toString(); 
      String getlasttname = lastname.getText().toString(); 
      String welcome=welcm.concat(space).concat(getfirstname).concat(space).concat(getlasttname); 





      if(username.getText().toString().length() > 0 && password.getText().toString().length() > 0) 
      { 
       if(username.getText().toString().equals("test") && password.getText().toString().equals("test")) 
       { 
        SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
        SharedPreferences.Editor editor = settings.edit(); 
        editor.putString("logged", "logged"); 
        editor.commit();  
        Intent intent = new Intent(Register.this, SecureXActivity.class); 
        intent.putExtra("name", welcome); 
        startActivity(intent); 
       } 
      } 
     } 
    }); 
} 
}

SecureXActivity.java

public void onCreate(Bundle savedInstanceState) 
{ 
    Thread.setDefaultUncaughtExceptionHandler(new exceptionHandler(this)); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     Bundle extras =getIntent().getExtras(); 

    if (extras != null) 
    { 
     String value = extras.getString("name"); 
     TextView txtwelcm= (TextView)findViewById(R.id.textViewwelcm); 
     txtwelcm.setText(value); 
    } 
}

我想從一個活動到另一個活動和值的值應保存到另一個活動。在我上面的代碼中，我使用意圖完成了這個任務。但問題是價值僅在第二項活動中顯示一次。當我按下返回按鈕或主鍵時，值是不可見的？如何做到這一點。

添加響應@Picarus：

的問題是我使用相同的共享偏好顯示寄存器活動只有一次。但它沒有顯示在得力名稱activity.Is有可能使用相同的共享的偏好來進行值從寄存器活性得力活動

整個代碼在下面給出再次 Register.java

public class Register extends Activity 
    { 
public static final String PREFS_NAME = "LoginPrefs"; 


@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.register); 

    /* 
    * Check if we successfully logged in before. 
    * If we did, redirect to home page 
    */ 
    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
    if (settings.getString("logged", "").toString().equals("logged")) 
    { 
     Intent intent = new Intent(Register.this, SecureXActivity.class); 
     startActivity(intent); 
    } 

    Button b = (Button) findViewById(R.id.btnRegister); 
    b.setOnClickListener(new OnClickListener() 
    { 
     public void onClick(View v) { 
      EditText username = (EditText) findViewById(R.id.reg_employeeid); 
      EditText password = (EditText) findViewById(R.id.reg_password); 
      String welcm ="Welcome"; 
      String space = " "; 
      EditText firstname = (EditText)findViewById(R.id.reg_firstname); 
      EditText lastname = (EditText)findViewById(R.id.reg_lastname); 
      String getfirstname = firstname.getText().toString(); 
      String getlasttname = lastname.getText().toString(); 
      String welcome=welcm.concat(space).concat(getfirstname).concat(space).concat(getlasttname); 





      if(username.getText().toString().length() > 0 && password.getText().toString().length() > 0) 
      { 
       if(username.getText().toString().equals("test") && password.getText().toString().equals("test")) 
       { 
        SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
        SharedPreferences.Editor editor = settings.edit(); 
        editor.putString("name", welcome); 
        editor.commit();  
        Intent intent = new Intent(Register.this, SecureXActivity.class); 
        //intent.putExtra("name", welcome); 
        startActivity(intent); 
       } 
      } 
     } 
    }); 
} 
}

SecureXActivity.java

public class SecureXActivity extends Activity 
{ 
public static final String PREFS_NAME = "LoginPrefs"; 

private ListView m_listview; 
Button btnSendlogs; 
Button btnMailadmin; 
Button btnContactSupport; 
Button btnSettings; 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    Thread.setDefaultUncaughtExceptionHandler(new exceptionHandler(this)); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    //Here we are setting the installation date of a application 
    ContextWrapper context = this; 
    PackageManager packageManager = context.getPackageManager(); 
    ApplicationInfo appInfo; 
    try 
    { 
     appInfo = packageManager.getApplicationInfo("com.simsys.securex", 0); 
     String sourceDir= appInfo.sourceDir; 
     long dateTimeSync= new File(sourceDir).lastModified(); 
     String DateTimeStamp=getDate(dateTimeSync, "dd/MM/yyyy hh:mm:ss"); 
     String dateTimeSync2="Installed_Date:"; 
     String dateTimeSync3=dateTimeSync2.concat(DateTimeStamp); 
     TextView txtCurrentTime= (TextView)findViewById(R.id.textViewdatetime); 
     txtCurrentTime.setText(dateTimeSync3); 
    } 
    catch (NameNotFoundException e) 
    { 
     e.printStackTrace(); 
    } 
    //Here We Welcome the user 

    //List View 
    m_listview = (ListView) findViewById(R.id.list_view); 
    ArrayList<String> listItems=new ArrayList<String>(); 
    listItems.add("CAMERA"); 
    listItems.add("RECORDER"); 
    ArrayAdapter<String> adapter = 
      new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listItems); 

    m_listview.setAdapter(adapter); 
    if(isBluetoothServiceRunning()) 
    { 
     listItems.add("BLUETOOTH"); 
    } 
    if(isGprsServiceRunning()) 
    { 
     listItems.add("GPRS"); 
    } 
    if(isWifiServiceRunning()) 
    { 
     listItems.add("WIFI"); 
    } 
    adapter.notifyDataSetChanged(); 
    //Call to Buttons Functionality 
    btnSendlogs = (Button) findViewById(R.id.button_sendlogs); 
    btnSendlogs.setOnClickListener(myhandler1); 
    btnMailadmin=(Button) findViewById(R.id.button_mailtoadmin); 
    btnMailadmin.setOnClickListener(MailadminHandler); 
    btnContactSupport = (Button) findViewById(R.id.button_contactsupport); 
    btnContactSupport.setOnClickListener(ContactSupportHandler); 

} 

//Navigation from Registration to Main page 
public boolean onCreateOptionsMenu(Menu menu) 
{ 
    MenuInflater Inflater = getMenuInflater(); 
    Inflater.inflate(R.menu.menu, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) 
{ 
    if (item.getItemId() == R.id.logout) 
    { 
     SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 

     String data2=settings.getString("name", ""); 
     TextView txtwelcm= (TextView)findViewById(R.id.textViewwelcm); 
     txtwelcm.setText(data2); 
     SharedPreferences.Editor editor = settings.edit(); 
     editor.remove("name"); 
     editor.commit(); 
     finish(); 
    } 
    return super.onOptionsItemSelected(item); 
}

來源

2012-08-01 Tirtha

不知道什麼是您的具體疑問檢索。你能澄清嗎？您可以根據需要在「共享首選項」中擁有儘可能多的設置，並且您可以擁有任意數量的不同文件......如果您澄清，我們將能夠爲您提供幫助。 – Picarus 2012-08-01 09:59:11

我希望從一個活動到另一個活動的價值應該保存到另一個活動。在我上面的代碼中，我使用意圖完成了這個任務。但問題是價值僅在第二項活動中顯示一次。當我按下返回按鈕或主頁鍵時，值不可見？ – Tirtha 2012-08-01 10:24:13

你面臨的問題是什麼。您正在使用共享首選項，然後嘗試從中獲得。 – Harish 2012-08-01 10:27:01

爲了實現sharedPreferences使用下面的代碼

Sharedpreferences myPref = this.getSharedPreferneces("your_file_name",MODE); 
SharedPreferences.Editor editor = myPref.edit(); 
editor.putString("String_Name",value); 
editor.putInt("Int_Name","value");

從SharedPreferences

Sharedpreferences myPref = this.getSharedPreferneces("your_file_name",MODE); 
    String stringValue = myPref.getStirng("String_Name","DEFAULT_VALUE");

來源

2012-08-01 11:57:21 ashutosh

您可以從任何活動（SecureXActivity）用同樣的方法檢索您的SharedPreferences你Register.java

012做

SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
settings.getString("logged", "");

你試過了嗎？你發現了什麼問題？

編輯：也許這是因爲你試圖從onCreate加載它。當您刷新或點擊主頁時，這不會被調用。你應該在你的應用中找到更適合的點。

來源

2012-08-01 10:53:52 Picarus

如何保存和檢索sharedpreferences中的多個值？

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