我如何修改的列表preference汇总由用户（未入账价值）

How can I modify the summary of a ListPreference to the new "Entry" string selected by the user (not the entry value)

我suppouse与塞顿preferenceChangeListener（），但在

I suppouse its with setOnPreferenceChangeListener() but in

new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            return true;
        }
    }

使用（（名单preference）preference）.getEntry（）我得到的旧值（因为它没有发生变化），并newValue.toString（）返回的入账价值（不进入文本显示给用户）

using ((ListPreference)preference).getEntry() I get the old value (because it isn't changed yet) and newValue.toString() returns the entry value (not the entry text displayed to the user)

我该怎么办呢？在此先感谢

How can I do it? Thanks in advance

推荐答案

刚刚成立汇总值％S 的XML描述。

Just set the summary value to %s in the xml description.

修改：我已经在多个设备上测试它，它不工作真的。这是奇怪，因为根据文档必须工作：List$p$pference.getSummary().

EDIT: I've tested it on several devices and it doesn't work really. That's strange because according to docs it must work: ListPreference.getSummary().

但它可能自己来实现这个功能。的执行需要从目录preference继承类：

But it's possible to implement this functionality by oneself. The implementation requires to inherit from the ListPreference class:

public class MyListPreference extends ListPreference {
    public MyListPreference(final Context context) {
        this(context, null);
    }

    public MyListPreference(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public CharSequence getSummary() {
        final CharSequence entry = getEntry();
        final CharSequence summary = super.getSummary();
        if (summary == null || entry == null) {
             return null;
        } else {
            return String.format(summary.toString(), entry);
        }
    }

    @Override
    public void setValue(final String value) {
        super.setValue(value);
        notifyChanged();
    }
}

正如你可以看到 MYLIST preference 具有可包含格式标记自己的汇总字段。而当preference值发生变化， preference.notifyChanged（）方法被调用，它会导致 MYLIST preference.getSummary （）从 preference.onBindView（）。

As you can see MyListPreference has its own summary field which can contain formatting markers. And when a preference's value changes, Preference.notifyChanged() method is called and it causes MyListPreference.getSummary() method to be called from Preference.onBindView().

PS：这种方法还没有经过充分的测试，因此它可能包含错误

P.S.: This approach hasn't been tested sufficiently so it may contain errors.