我正在尝试更新 SharedPreferences 的值，这是我的代码:

edit = PreferenceManager.getDefaultSharedPreferences(this).edit();
edit.putString(Settings.PREF_USERNAME+"",txtuser);
edit.putString(Settings.PREF_PASSWORD+"",txtpass);
edit.commit();" 

问题是当我访问这个值时，它没有返回更新的值，它给了我一个 SharedPreferences 的值。

但是当我确认 XML 文件中的数据时，其中的数据更新了。

在重新启动我的应用程序后，我得到了更新的值。所以它需要我重新启动应用程序以获取更新的值。
那么，一旦发生变化，如何获取这些更新的值呢？

提前致谢

这是我的全部代码:

@Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        ctx=this;

            status=PreferenceManager.getDefaultSharedPreferences(this).getString(Settings.PREF_STATUS, Settings.DEFAULT_STATUS);// get old value
        submit.setOnClickListener(new View.OnClickListener() {
          @Override
            public void onClick(View v) {

                  on(ctx,true);//  function will call and value is updated

                }
            }});    

     status=PreferenceManager.getDefaultSharedPreferences(this).getString(Settings.PREF_STATUS, Settings.DEFAULT_STATUS);// this should give me a updated value but gives old value

    }
    public static boolean on(Context context) {
        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(Settings.PREF_ON, Settings.DEFAULT_ON);
    }

    public static void on(Context context,boolean on) {
            if (on) Receiver.engine(context).isRegistered(); //
        }




**********in reciver file***********
public void isRegistered ) {
        Editor edit = PreferenceManager.getDefaultSharedPreferences(Receiver.mContext).edit();
        edit.putString(Settings.PREF_STATUS+"","0");
        edit.commit();
}

最佳答案

您应该使用 edit.apply();，而不是使用 edit.commit();。 Apply 将立即更新首选项对象并异步保存新值，以便您读取最新值。

commit()

Commit your preferences changes back from this Editor to the SharedPreferences object it is editing. This atomically performs the requested modifications, replacing whatever is currently in the SharedPreferences.

Note that when two editors are modifying preferences at the same time, the last one to call commit wins.

If you don't care about the return value and you're using this from your application's main thread, consider using apply() instead.

申请()

Commit your preferences changes back from this Editor to the SharedPreferences object it is editing. This atomically performs the requested modifications, replacing whatever is currently in the SharedPreferences.

Note that when two editors are modifying preferences at the same time, the last one to call apply wins.

Unlike commit(), which writes its preferences out to persistent storage synchronously, apply() commits its changes to the in-memory SharedPreferences immediately but starts an asynchronous commit to disk and you won't be notified of any failures. If another editor on this SharedPreferences does a regular commit() while a apply() is still outstanding, the commit() will block until all async commits are completed as well as the commit itself.

As SharedPreferences instances are singletons within a process, it's safe to replace any instance of commit() with apply() if you were already ignoring the return value.

You don't need to worry about Android component lifecycles and their interaction with apply() writing to disk. The framework makes sure in-flight disk writes from apply() complete before switching states.

关于android - SharedPreferences 值未更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10186215/