我無法將數據保存到SharePrefence字符串

將字符串保存到SharedPreference時出現問題。此類保存號碼卡並從SharedPreference中獲取字符串。這是我的課MyShrePreference。我不知道爲什麼該字符串沒有保存到SharedPreference。我無法將數據保存到SharePrefence字符串

public class MySharepreference { 

    public static final String PREFS_NAME = "POSITION"; 
    public static final String POSITION = "current"; 
    public String nameString; 

    public MySharepreference() { 
     super(); 
    } 


    public void saveNumberCard(Context context, String position) { 
     SharedPreferences settings; 
     SharedPreferences.Editor editor; 
     settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); 
     editor = settings.edit(); 
     editor.putString(POSITION, position); 
     editor.commit(); 
    } 

    public String getNumberCard(Context context) { 
     SharedPreferences sharedPreferences; 
     sharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); 
     if (sharedPreferences.contains(POSITION)) { 
      nameString = sharedPreferences.getString(POSITION, ""); 
     } 
     return nameString; 
    } 

}

保存到SharedPreference到適配器

onBindViewHolder

@Override 
    public void onBindViewHolder(CardViewHolder holder, final int position) { 

    mySharepreference = new MySharepreference(); 

     if (position == lastCheckedPos) { 
      mySharepreference.saveNumberCard(mContext, card.getNumberCard()); 
}

來源

2017-08-11 Ewelina Maj

更好地解釋你的問題。 –

你可以添加代碼，你調用這個方法 –

你的代碼是好的，只要刪除** if（sharedPreferences.contains（POSITION））** –

public class SharedPreferenceUtils { 
    private static final Context context = MyApplication.getInstance(); 
    private static String SHARED_PREFERENCES_FILE_NAME = "myapplicationpref"; 
    private static SharedPreferences preference; 

    public static SharedPreferences getSharedPrefrence() { 
     if (preference == null) { 
      preference = context.getSharedPreferences(SHARED_PREFERENCES_FILE_NAME, 
        Context.MODE_PRIVATE); 
     } 
     return preference; 

    } 


    public static String getStringValueFromSharedPrefarence(String key, String defaultValue) { 
     return getSharedPrefrence().getString(key, defaultValue); 

    } 
    public static boolean getBooleanValueFromSharedPrefarence(String key, boolean defaultValue) { 
     return getSharedPrefrence().getBoolean(key, defaultValue); 
    } 

    public static boolean setBooleanValueToSharedPrefarence(String key, boolean value) { 
     return getSharedPrefrence().edit().putBoolean(key, value).commit(); 

    } 
    public static boolean setStringValueToSharedPrefarence(String key, String value) { 
     return getSharedPrefrence().edit().putString(key, value).commit(); 

    } 
    public static boolean setStringSetToSharedPrefarence(String key, Set<String> value) { 
     return getSharedPrefrence().edit().putStringSet(key, value).commit(); 

    } 

}

來源

2017-08-11 10:45:56

其餘的代碼是好的，這一行是泄漏上下文private static final Context context = MyApplication.getInstance（）; ，而是可以使用單例設計模式並將應用程序上下文傳遞給它。 – NaserShaikh

更改代碼mContext到getApplicationContext（），像

 mySharepreference.saveNumberCard(getApplicationContext(), card.getNumberCard());

來源

2017-08-11 10:58:32

我無法將數據保存到SharePrefence字符串

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