获取活动/普通班级中的Android共享偏好值-GetAndroidsharedpreferencesvalueinactivity/normalclass

62  

If you have a SharedPreferenceActivity by which you have saved your values

如果您有一个SharedPreferenceActivity,您可以通过它保存您的值

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String imgSett = prefs.getString(keyChannel, "");

if the value is saved in a SharedPreference in an Activity then this is the correct way to saving it.

如果值保存在Activity中的SharedPreference中,那么这是保存它的正确方法。

SharedPreferences shared = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
SharedPreferences.Editor editor = shared.edit();
editor.putString(keyChannel, email);
editor.commit();// commit is important here.

and this is how you can retrieve the values.

这就是你可以检索这些值的方法。

SharedPreferences shared = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
String channel = (shared.getString(keyChannel, ""));

Also be aware that you can do so in a non-Activity class too but the only condition is that you need to pass the context of the Activity. use this context in to get the SharedPreferences.

另请注意,您也可以在非Activity类中执行此操作,但唯一的条件是您需要传递Activity的上下文。使用此上下文来获取SharedPreferences。

mContext.getSharedPreferences(PREF_NAME, MODE_PRIVATE);

4  

I tried this code, to retrieve shared preferences from an activity, and could not get it to work:

我尝试使用此代码,从活动中检索共享首选项,但无法使其工作:

        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    sharedPreferences.getAll();
    Log.d("AddNewRecord", "getAll: " + sharedPreferences.getAll());
    Log.d("AddNewRecord", "Size: " + sharedPreferences.getAll().size());

Every time I tried, my preferences returned 0, even though I have 14 preferences saved by the preference activity. I finally found the answer. I added this to the preferences in the onCreate section.

每次我尝试时,我的首选项返回0,即使我有偏好活动保存的14个首选项。我终于找到了答案。我将此添加到onCreate部分的首选项中。

getPreferenceManager().setSharedPreferencesName("defaultPreferences");

After I added this statement, my saved preferences returned as expected. I hope that this helps someone else who may experience the same issue that I did.

添加此语句后,我保存的首选项按预期返回。我希望这可以帮助其他可能遇到同样问题的人。

1  

This is the procedure that seems simplest to me:

这个程序对我来说似乎最简单:

SharedPreferences sp = getSharedPreferences("MySharedPrefs", MODE_PRIVATE);
SharedPreferences.Editor e = sp.edit();

    if (sp.getString("sharedString", null).equals("true")
            || sp.getString("sharedString", null) == null) {
        e.putString("sharedString", "false").commit();
        // Do something
    } else {
        // Do something else
    }

0  

You use uninstall the app and change the sharedPreferences name then run this application. I think it will resolve the issue.

您可以使用卸载应用程序并更改sharedPreferences名称,然后运行此应用程序。我认为它将解决这个问题。

A sample code to retrieve values from sharedPreferences you can use the following set of code,

从sharedPreferences中检索值的示例代码,您可以使用以下代码集,

SharedPreferences shared = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
String channel = (shared.getString(keyValue, ""));