[英]Android: sharedPreference in Fragment,not read data from Class
i have this class for SharedPref work我有这个 class 用于 SharedPref 工作
package com.box.a100rados.Data;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import static android.content.Context.MODE_PRIVATE;
public class UserAccessSession {
private SharedPreferences sharedPref;
private Editor editor;
private static final String FILTER_RADIUS_DISTANCE = "FILTER_RADIUS_DISTANCE";
private static final String Name = "Name";
private static final String Photo = "Photo";
private static final String Rank = "Rank";
private static final String Sid = "Sid";
private static final String Ban = "Ban";
private static final String Latitude = "Latitude";
private static final String Longitude = "Longitude";
private static final String SHARED = "UserData";
private static UserAccessSession instance;
public static UserAccessSession getInstance(Context context) {
if(instance == null)
instance = new UserAccessSession(context);
return instance;
}
public UserAccessSession(Context context) {
sharedPref = context.getSharedPreferences(SHARED, MODE_PRIVATE);
editor = sharedPref.edit();
}
public void storeUserSession(UserSession session) {
editor.putString(Name, session.getUsername());
editor.putString(Photo, session.getPhoto_url());
editor.putInt(Rank, session.getUser_Rank());
editor.putString(Sid, session.getUser_id());
editor.putBoolean(Ban, session.getUser_Ban());
editor.putString(Latitude, session.getLatitude());
editor.putString(Longitude, session.getLongitude());
editor.apply();
}
public void clearUserSession() {
editor.putString(Name, null);
editor.putString(Photo, null);
editor.putInt(Rank, 1);
editor.putString(Sid, null);
editor.putBoolean(Ban, false);
editor.putString(Latitude, null);
editor.putString(Longitude, null);
editor.apply();
}
public UserSession getUserSession() {
UserSession session = new UserSession();
session.setUsername( sharedPref.getString(Name, null) );
session.setPhoto_url( sharedPref.getString(Photo, null) );
session.setUser_Rank( sharedPref.getInt(Rank, 1) );
session.setUser_id( sharedPref.getString(Sid, "") );
session.setUser_Ban( sharedPref.getBoolean(Ban, false) );
session.setLatitude(sharedPref.getString(Latitude,"59.946104"));
session.setLongitude(sharedPref.getString(Longitude,"30.306048"));
return session;
}
public void setFilterDistance(float radius) {
editor.putFloat(FILTER_RADIUS_DISTANCE, radius);
editor.commit();
}
public float getFilterDistance() {
return sharedPref.getFloat(FILTER_RADIUS_DISTANCE, 0);
}
}
How i call:我怎么称呼:
UserAccessSession tes = UserAccessSession.getInstance(getActivity().getApplicationContext());
UserSession test = tes.getUserSession();
But in test.getLatitude()
or test.getLongitude()
i have Null value.但在test.getLatitude()
或test.getLongitude()
我有 Null 值。 The same sometimes happens in the main activity with getUser_Rank
and getUsername
or other values.在使用getUser_Rank
和getUsername
或其他值的主要活动中有时也会发生同样的情况。 What have I done wrong and how can I fix it?我做错了什么,我该如何解决? On the map, after re-opening, I get data from the SharedPref and the map camera moves where I need.在 map 上,重新打开后,我从 SharedPref 获取数据,并且 map 相机移动到我需要的位置。
PS I add data like this PS我添加这样的数据
UserSession userSession = new UserSession();
UserAccessSession session = UserAccessSession.getInstance(MainActivity.this);
String sid = User_SID;
userSession.setUsername(UserName);
userSession.setPhoto_url(Photo_URL);
userSession.setUser_Rank(Rank);
userSession.setUser_id(sid);
session.storeUserSession(userSession);
Coordinates i add like this:我这样添加的坐标:
userAccess = UserAccessSession.getInstance(MainActivity.this);
userSession = userAccess.getUserSession();
userSession.setLatitude(String.valueOf(location.getLatitude()));
userSession.setLongitude(String.valueOf(location.getLongitude()));
userAccess.storeUserSession(userSession);
Thank you for help.谢谢你的帮助。 I apologize for the possible repetition of the question.对于问题可能重复,我深表歉意。 I speak English poorly and it's hard to find information.我的英语说得不好,而且很难找到信息。
I guess as you are accessing is from different sources, issues occurs.我想当您访问来自不同来源时,会出现问题。
Use the default shared preference instead, which uses a single file for storage instead different ones.请改用默认的共享首选项,它使用单个文件而不是不同的文件进行存储。
Replace this context.getSharedPreferences(SHARED, MODE_PRIVATE);
替换这个context.getSharedPreferences(SHARED, MODE_PRIVATE);
with this PreferenceManager.getDefaultSharedPreferences(context.getApplicationContext());
使用此PreferenceManager.getDefaultSharedPreferences(context.getApplicationContext());
change set to get更改设置以获取
public UserSession getUserSession() {
UserSession session = new UserSession();
session.getUsername( sharedPref.getString(Name, null) );
session.getPhoto_url( sharedPref.getString(Photo, null) );
session.getUser_Rank( sharedPref.getInt(Rank, 1) );
session.getUser_id( sharedPref.getString(Sid, "") );
session.getUser_Ban( sharedPref.getBoolean(Ban, false) );
session.getLatitude(sharedPref.getString(Latitude,"59.946104"));
session.getLongitude(sharedPref.getString(Longitude,"30.306048"));
return session;
}
I'm stupid.我真笨。
userAccess = UserAccessSession.getInstance(MainActivity.this);
userSession = userAccess.getUserSession();
userSession.setLatitude(String.valueOf(location.getLatitude()));
userSession.setLongitude(String.valueOf(location.getLongitude()));
userAccess.storeUserSession(userSession);
This call cleared existing data.此调用清除了现有数据。 Transferred coordinates to a separate method, everything worked.将坐标转移到一个单独的方法,一切正常。
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