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今天在实现一个保存用户设置到SharedPreferences时,出现了一个不能将数据保存到SharedPreferences中的情况。经过仔细的分析得出:
android.content.SharedPreferences.Editor.putString(String key, String value)
和
android.content.SharedPreferences.Editor.commit()
这两个方法所用的editor不同所致。
错误代码如下:
SharedPreferences config_sp = getSharedPreferences("config", MODE_PRIVATE);
config_sp.edit().putString("passwd_safe", enCodeSafePasswd);
config_sp.edit().commit();
SharedPreferences.edit()方法的说明如下
/**
* Create a new Editor for these preferences, through which you can make
* modifications to the data in the preferences and atomically commit those
* changes back to the SharedPreferences object.
*
* <p>Note that you <em>must</em> call {@link Editor#commit} to have any
* changes you perform in the Editor actually show up in the
* SharedPreferences.
*
* @return Returns a new instance of the {@link Editor} interface, allowing
* you to modify the values in this SharedPreferences object.
*/
正如上面红色的标记所说,该方法会创建一个新的Editor对象,因此两次的Editor对象是不一样的。所以就造成了数据存储失败。
android.content.SharedPreferences.edit()
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原文地址:http://www.cnblogs.com/ithaibo-sit/p/4579077.html