如何检测是否变化在preferences做？

问题描述

我有一个扩展preferenceActivity，并显示我的应用程序的preference屏幕的类。是否可以检查是否有任何变化到preferences做？

这可以帮助...

<一个href="http://developer.android.com/reference/android/content/Shared$p$pferences.OnShared$p$pferenceChangeListener.html">http://developer.android.com/reference/android/content/Shared$p$pferences.OnShared$p$pferenceChangeListener.html

其他相关岗位：<一href="http://stackoverflow.com/questions/2542938/shared$p$pferences-onshared$p$pferencechangelistener-not-being-called-consistently">Shared$p$pferences.onShared$p$pferenceChangeListener没有所谓的一贯

---

 公共类preferenceClass扩展preferenceActivity {

    OnShared preferenceChangeListener监听;

    公共无效的onCreate（包savedInstanceState）{
        共享preferences preFS = this.getShared preferences（设置，0）;
        监听=新的共享preferences.OnShared preferenceChangeListener（）{

            公共无效onShared preferenceChanged（共享preferences preFS，字符串键）{
                INT标志= 1;
            }
        };
        prefs.registerOnShared preferenceChangeListener（听众）;
        super.onCreate（空）;
        加preferencesFromResource（R.xml.settings）;
    }
}
 

解决方案

不要

 共享preferences.OnShared preferenceChangeListener spChanged =新
                           共享preferences.OnShared preferenceChangeListener（）{
            @覆盖
    公共无效onShared preferenceChanged（共享preferences共享preferences，
            字符串键）{
        //你这里的东西
    }
};
 

在你的 preferenceActivity ，也就是让你的 preferenceActivity 类的成员，然后做 registerOnShared preferenceChangeListener（spChanged）在 preferenceActivity.onCreate（）方法。

这是我做的，我永远不会有问题。

否则它在侦听器有过错的条件检查。发表在code。

编辑：

从C你贴，你应该做的$ C $ preFS A类成员变量所以它有一个全局范围。

和做 preFS = preferenceManager.getDefaultShared preferences（getApplicationContext（））; 而不是 getShared preferences 因为你还没有创建该文件。

要创建你需要使用 preferenceManager 的文件。要获得 preferenceManager ，使用 Activity.get preferenceManager（）。

I have a class that extends PreferenceActivity and shows the preference screen of my app. Is it possible to check if any changes were made to the preferences?

This helps...

http://developer.android.com/reference/android/content/SharedPreferences.OnSharedPreferenceChangeListener.html

Other related post:SharedPreferences.onSharedPreferenceChangeListener not being called consistently

---

public class PreferenceClass extends PreferenceActivity {

    OnSharedPreferenceChangeListener listener;

    public void onCreate(Bundle savedInstanceState) {
        SharedPreferences prefs = this.getSharedPreferences("settings", 0);
        listener = new SharedPreferences.OnSharedPreferenceChangeListener() {

            public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
                int flag = 1;
            }
        };
        prefs.registerOnSharedPreferenceChangeListener(listener);
        super.onCreate(null);
        addPreferencesFromResource(R.xml.settings);
    }
}

解决方案

Do

SharedPreferences.OnSharedPreferenceChangeListener spChanged = new
                           SharedPreferences.OnSharedPreferenceChangeListener() {
            @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
            String key) {
        // your stuff here
    }
};

In your PreferenceActivity, ie make it a member of your PreferenceActivity class and then do registerOnSharedPreferenceChangeListener(spChanged) in the PreferenceActivity.onCreate() method.

That's what I do and I never have a problem.

Else it's your conditional checking in the listener that is at fault. Post the code.

EDIT:

From the code you posted, you should make prefs a class member variable so it has a global scope.

And do prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); instead of getSharedPreferences because you haven't created that file.

To create a file you need to use PreferenceManager. To get a PreferenceManager, use Activity.getPreferenceManager().

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