共享preferences恢复数据时，应用程序是强制关闭或重启设备 [英] Shared Preferences reset data when app is force closed or device is restarted

问题描述

我正在开发的用户名和密码 >共享preferences 。所有的事情都工作正常，对我来说，存储以及检索值。但我发现，当我重新启动设备或应用程序是力封闭储存在的价值共享preferences 复位。当我再次启动我的应用程序，我得到的 键空值共享preferences。在这里，是我在做存储的值：

I'm developing an application in which I'm storing username and password in SharedPreferences. All things are working fine for me, storing as well as retrieving the values. But I discovered that when I restart the device or the app is force closed the value stored in SharedPreferences is reset. And when I again launch my app I get null values in SharedPreferences key. Here, is what I'm doing for storing the values:

SharedPreferences emailLoginSP;

emailLoginSP = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
emailLoginSP.edit().putString("prefEmailId", email_text).commit();
emailLoginSP.edit().putString("prefUserId", userIDToken).commit();
emailLoginSP.edit().putString("prefAccess_token", accessToken).commit();

Intent i = new Intent(LoginWithEmail.this,UserInfoActivity.class);
i.putExtra("acess_token", accessToken);
i.putExtra("user_id", userIDToken);
i.putExtra("emailID", email_text);
startActivity(i);

和，这就是我retriving是：

And, this is how I'm retriving it:

SharedPreferences emailLoginSP = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());

loginEmail = emailLoginSP.getString("prefEmailId", null);
loginUserId = emailLoginSP.getString("prefUserId", null);
loginAccessToken = emailLoginSP.getString("prefAccess_token", null);

所有的事情都工作正常至今。 再次声明，我指出我的问题，我得到空值时，我强制关闭或重新启动设备。我们可以永久保存它在应用程序的内存？或者说，我在这里做得不对？

All things are working fine till now. Again I'm stating my problem that I get null values when I force close or restart my device. Can we store it permanently in the app memory? Or, I'm doing something wrong here?

任何帮助将AP preciated。

Any help will be appreciated.

推荐答案

嗯，这就是有趣的。我已经通过这个要求我的应用程序。我有一个登录界面，我想有应用程序留在内屏甚至当应用程序被关闭/销毁/电话/等等登录。我得到它的工作，它现在保持共享preferences 当应用程序被破坏，就像你问。

Hmm thats interesting. I've been through this requirement in my app. I had a login screen and I wanted to have the app stay "logged in" at the internal screen even when the app is closed/destroyed/phone call/etc. I got it working so it now keeps SharedPreferences when the app is destroyed just as you ask.

如果它帮助这里是我的code：

if it helps here is my code:

我有一个 preferences 对象，我用它来保存下一个用户preferences值登录或注册。然后我看了preference值中的所有键屏幕 onResume（）的方法。

I have a Preferences Object which I use to save preferences values following a user Login or Register. I then read preference values in all the key screen onResume() methods.

登录（例如）后：

SharedPreferences app_preferences = PreferenceManager.getDefaultSharedPreferences(activity);
SharedPreferences.Editor editor = app_preferences.edit();
editor.putString("sessionId", application.currentSessionId);
editor.putString("userId", application.currentUserId);
editor.putString("userEmail", application.currentUserEmail);
editor.putString("siteUserId", application.currentSiteUserId);
editor.commit();

在onResume（）中的活动： （例如，在你的内部网）

Within onResume() of your Activities: (ie, within your internal screens)

SharedPreferences app_preferences = PreferenceManager.getDefaultSharedPreferences(activity);
application.currentSessionId = app_preferences.getString("sessionId", "");
application.currentUserId = app_preferences.getString("userId", "");
application.currentUserEmail = app_preferences.getString("userEmail", "");
application.currentSiteUserId = app_preferences.getString("siteUserId", "");

请注意。我有参加办法全局变量我使用，即 application.currentSessionId ，你可以替换的变量

Note. I have appplication "global" variables i use, ie, application.currentSessionId, you can just substitute your variables

我希望能帮助？尝试类似code，也许你只是没有保存或获取正确的值，因为分享preferences 一定要保留价值，因为你需要

I hope that can help? Try similar code maybe your just not saving or retrieving the values correctly because SharePreferences should definitely retain values as you need

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