我有一段简单的代码:
SharedPreferences settings = getSharedPreferences(Constants.USER_DETAILS, 0);
SharedPreferences.Editor editor = settings.edit();
//editor.putLong(Constants.USER_DETAILS_SIGNEDINON, registerResponse.getSignedInOn()); // signed in on
editor.putLong(Constants.USER_DETAILS_SIGNEDINON, 1); // signed in on
long test = settings.getLong(Constants.USER_DETAILS_SIGNEDINON, 2);
if (settings.edit().commit()) {
System.out.print("ok");
} else {
System.out.print("not ok");
}
正如你所看到的,我一直在玩弄以了解正在发生的事情。
所以,我已经检查了/数据/数据/...并且首选项文件确实已创建,但为空(仅地图标签)
测试长变量返回 2,即使我之前将其设置为 1 行。提交返回 true。
我错过了什么吗?
我已经设置了使用权限安卓:名称=android.permission.WRITE_EXTERNAL_STORAGE 尽管我相信只有当我真正进行外部存储时才需要这样做。
问候。大卫。
我遇到的一件事是你不能继续调用pref.edit()并期望你的更改能够持续存在。似乎每次调用 pref.edit() 都会生成一个新的编辑器(而不是单例)。
不会持久:
pref.edit().remove("key"); // new editor created
pref.edit().commit(); // new editor created
将持续:
Editor edit=pref.edit(); // new editor created
edit.remove("key"); // same editor used
edit.commit(); // same editor used
试试这段代码。
SharedPreferences settings = getSharedPreferences(Constants.USER_DETAILS, 0);
SharedPreferences.Editor editor = settings.edit();
//editor.putLong(Constants.USER_DETAILS_SIGNEDINON, registerResponse.getSignedInOn()); // signed in on
editor.putLong(Constants.USER_DETAILS_SIGNEDINON, 1); // signed in on
if (editor.commit()) {
System.out.print("ok");
} else {
System.out.print("not ok");
}
long test = settings.getLong(Constants.USER_DETAILS_SIGNEDINON, 2);
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); 0 - for private mode
Editor editor = pref.edit();
editor.putBoolean("key_name", true); // Storing boolean - true/false
editor.putString("key_name", "string value"); // Storing string
// returns stored preference value
// If value is not present return second param value - In this case null
pref.getString("key_name", null); // getting String
pref.getInt("key_name", null); // getting Integer
editor.remove("name"); // will delete key name
editor.remove("email"); // will delete key email
editor.commit(); // commit changes
editor.clear();
editor.commit(); // commit changes