如何在Android中从SharedReferences检索int值

我试图从SharedReference中保存和获取价值，但就存储数据而言，它工作正常，但在检索价值时我无能为力

//定常

private static final String WALLPAPER_PREF_FILE = "wallpaper";

//用于存储键值对的方法

public void saveWallpaper(Context context,int wallpaperId) {

       SharedPreferences pref = context.getSharedPreferences(WALLPAPER_PREF_FILE, Activity.MODE_PRIVATE);
        SharedPreferences.Editor  editor = pref.edit();
        editor.putInt("wallpaperId", wallpaperId);
        editor.commit();
     }

//方法检索存储在SharedReference中的值

 public static int getSavedWallpaper(Context context) {

        SharedPreferences pref = context.getSharedPreferences(
                WALLPAPER_PREF_FILE, Activity.MODE_PRIVATE);
        return pref.getInt("wallpaperId", -1);
    }

---

看起来你在检索中输入了错别字-wallpaerId。把它修好，它就会工作。（更好的是，在保存和检索时都使用常量字符串，以避免出现此问题）。

尝试这些方法以接收值

public static String getSharedPrefData(Context activity, String key) {
    SharedPreferences prefs = activity.getSharedPreferences(PREFRENCE_NAME,
            Context.MODE_PRIVATE);
    String value = "";
    if (prefs != null && prefs.contains(key)) {
        value = prefs.getInt(key, defaultValue);
    }
    return value;
}

Getter-Setter方法

public void setUserId(int userId) {
    this.userId = userId;
    SharedPreferences.Editor Editor = pref.edit();
    Editor.putInt(PUSH_USER_ID, userId);
    Editor.apply();
    Log.e(TAG, userId + " successfull");
}

public int getUserId() {
    return userId;
}

//检索整数值

SharedPreferences pref = new SharedPreferences();
    pref.getUserId()

---

步骤1：创建名为SessionManager的公共类

public class SessionManager {

  final static String appPrefNames="MyAppInfo";
    public static SharedPreferences myPrefsSession;
    public static SharedPreferences.Editor prefsEditorSession;

    public static void setUserId(Context context, String userId) {

        myPrefsSession = context.getSharedPreferences(appPrefNames, Context.MODE_PRIVATE);
        prefsEditorSesstion = myPrefsSession.edit();
        try {
           prefsEditorSesstion.putString("user_id", userId);

        } catch (Exception e) {
            e.printStackTrace();
        }
        prefsEditorSesstion.commit();
    }


    public static String getUserId(Context c) {
        myPrefsSession = c.getSharedPreferences(appPrefNames, Context.MODE_PRIVATE);
        String userId= myPrefsSession.getString("user_id", "");
        return userId;
    }
}

第2步：在活动课中

SessionManager sessionManager = new SessionManager();
//Setting UserId by method
sessionManager.setUserId(this,"12");

// get Your user id
String userId = sessionManager.getUserId();

---

用于使用常量+1共享首选项getPreff=PreferenceManager.GetDefaultSharedReferences（getActivity（））；intresid=getPreff.getInt（“wallpaerId”，即“）；只要解决你的拼写错误“wallpaerId”，它就会很好地工作。检查我下面的回答。@Thommy它不工作，尽管我喜欢墙纸，但当“活动”重新创建时，我还是得到了默认墙纸。@手动检查我的更新答案，现在它将帮助您。感谢Suhas先生的及时帮助，但我再次无法检索id。这样，您永远不会得到id:int resId=res.getIdentifier（“墙纸”，getResources（）.getDrawable（R.drawable.chat\u composer）.toString（），this.getPackageName（）；所以更新代码，如上所示。

public class SessionManager {

  final static String appPrefNames="MyAppInfo";
    public static SharedPreferences myPrefsSession;
    public static SharedPreferences.Editor prefsEditorSession;

    public static void setUserId(Context context, String userId) {

        myPrefsSession = context.getSharedPreferences(appPrefNames, Context.MODE_PRIVATE);
        prefsEditorSesstion = myPrefsSession.edit();
        try {
           prefsEditorSesstion.putString("user_id", userId);

        } catch (Exception e) {
            e.printStackTrace();
        }
        prefsEditorSesstion.commit();
    }


    public static String getUserId(Context c) {
        myPrefsSession = c.getSharedPreferences(appPrefNames, Context.MODE_PRIVATE);
        String userId= myPrefsSession.getString("user_id", "");
        return userId;
    }
}

SessionManager sessionManager = new SessionManager();
//Setting UserId by method
sessionManager.setUserId(this,"12");

// get Your user id
String userId = sessionManager.getUserId();