我已经看到了所有投票的答案，展示了如何用准确的当前值设置摘要，但OP也想要这样的东西:

“x天后清理消息”* <- summary，其中x是当前首选项值

以下是我实现这一目标的答案

根据ListPreference.getSummary()上的文档:

返回此ListPreference的摘要。如果摘要中有一个字符串格式标记(即。“%s”或“%1$s”)，然后是当前值 输入值将被替换在其位置上。

然而，我在几台设备上尝试了这一功能，似乎不起作用。通过一些研究，我在这个答案中找到了一个很好的解决方案。它简单地由扩展你使用的每个Preference和覆盖getSummary()组成，以按照Android文档指定的方式工作。

如果适合您的需求，有一些方法可以使其成为更通用的解决方案。

例如，如果你想让所有的列表首选项显示为摘要，你可以为你的onSharedPreferenceChanged实现:

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    Preference pref = findPreference(key);

    if (pref instanceof ListPreference) {
        ListPreference listPref = (ListPreference) pref;
        pref.setSummary(listPref.getEntry());
    }
}

这很容易扩展到其他首选项类。

通过使用PreferenceScreen和PreferenceCategory中的getPreferenceCount和getPreference功能，您可以轻松地编写一个泛型函数来遍历首选项树，设置所需类型的所有首选项的摘要到它们的toString表示

如果您只想显示每个字段的纯文本值作为摘要，那么下面的代码应该是最容易维护的。它只需要两处更改(第13行和第21行，标记为“此处更改”):

package com.my.package;

import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;

public class PreferencesActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {

    private final String[] mAutoSummaryFields = { "pref_key1", "pref_key2", "pref_key3" }; // change here
    private final int mEntryCount = mAutoSummaryFields.length;
    private Preference[] mPreferenceEntries;

    @SuppressWarnings("deprecation")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences_file); // change here
        mPreferenceEntries = new Preference[mEntryCount];
        for (int i = 0; i < mEntryCount; i++) {
            mPreferenceEntries[i] = getPreferenceScreen().findPreference(mAutoSummaryFields[i]);
        }
    }

    @SuppressWarnings("deprecation")
    @Override
    protected void onResume() {
        super.onResume();
        for (int i = 0; i < mEntryCount; i++) {
            updateSummary(mAutoSummaryFields[i]); // initialization
        }
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); // register change listener
    }

    @SuppressWarnings("deprecation")
    @Override
    protected void onPause() {
        super.onPause();
        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this); // unregister change listener
    }

    private void updateSummary(String key) {
        for (int i = 0; i < mEntryCount; i++) {
            if (key.equals(mAutoSummaryFields[i])) {
                if (mPreferenceEntries[i] instanceof EditTextPreference) {
                    final EditTextPreference currentPreference = (EditTextPreference) mPreferenceEntries[i];
                    mPreferenceEntries[i].setSummary(currentPreference.getText());
                }
                else if (mPreferenceEntries[i] instanceof ListPreference) {
                    final ListPreference currentPreference = (ListPreference) mPreferenceEntries[i];
                    mPreferenceEntries[i].setSummary(currentPreference.getEntry());
                }
                break;
            }
        }
    }

    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        updateSummary(key);
    }

}

我发现这种方法使EditTextPreference从支持库句柄“%s”在总结(因为ListPreference已经处理):

public class EditTextPreference extends android.support.v7.preference.EditTextPreference {
    public EditTextPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setText(String text) {
        super.setText(text);
        notifyChanged();
    }

    @Override
    public CharSequence getSummary() {
        String text = super.getText();
        String summary = super.getSummary().toString();
        return String.format(summary, text == null ? "" : text);
    }
}

在xml中它看起来是这样的:

<com.example.yourapp.EditTextPreference
    android:defaultValue="1"
    android:key="cleanup_period"
    android:summary="Clean up messages after %s days"
    android:title="Clean up period" />

根据Android文档，你可以在ListPreference和EditTextPreference组件中使用app:useSimpleSummaryProvider="true"。

Here,all these are cut from Eclipse sample SettingsActivity. I have to copy all these too much codes to show how these android developers choose perfectly for more generalized and stable coding style. I left the codes for adapting the PreferenceActivity to tablet and greater API. public class SettingsActivity extends PreferenceActivity { @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); setupSummaryUpdatablePreferencesScreen(); } private void setupSummaryUpdatablePreferencesScreen() { // In the simplified UI, fragments are not used at all and we instead // use the older PreferenceActivity APIs. // Add 'general' preferences. addPreferencesFromResource(R.xml.pref_general); // Bind the summaries of EditText/List/Dialog preferences to // their values. When their values change, their summaries are updated // to reflect the new value, per the Android Design guidelines. bindPreferenceSummaryToValue(findPreference("example_text")); bindPreferenceSummaryToValue(findPreference("example_list")); } /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() { private String TAG = SettingsActivity.class.getSimpleName(); @Override public boolean onPreferenceChange(Preference preference, Object value) { String stringValue = value.toString(); if (preference instanceof ListPreference) { // For list preferences, look up the correct display value in // the preference's 'entries' list. ListPreference listPreference = (ListPreference) preference; int index = listPreference.findIndexOfValue(stringValue); // Set the summary to reflect the new value. preference.setSummary( index >= 0 ? listPreference.getEntries()[index] : null); } else { // For all other preferences, set the summary to the value's // simple string representation. preference.setSummary(stringValue); } Log.i(TAG, "pref changed : " + preference.getKey() + " " + value); return true; } }; /** * Binds a preference's summary to its value. More specifically, when the * preference's value is changed, its summary (line of text below the * preference title) is updated to reflect the value. The summary is also * immediately updated upon calling this method. The exact display format is * dependent on the type of preference. * * @see #sBindPreferenceSummaryToValueListener */ private static void bindPreferenceSummaryToValue(Preference preference) { // Set the listener to watch for value changes. preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener); // Trigger the listener immediately with the preference's // current value. sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, PreferenceManager .getDefaultSharedPreferences(preference.getContext()) .getString(preference.getKey(), "")); } } xml/pref_general.xml <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > <!-- NOTE: EditTextPreference accepts EditText attributes. --> <!-- NOTE: EditTextPreference's summary should be set to its value by the activity code. --> <EditTextPreference android:capitalize="words" android:defaultValue="@string/pref_default_display_name" android:inputType="textCapWords" android:key="example_text" android:maxLines="1" android:selectAllOnFocus="true" android:singleLine="true" android:title="@string/pref_title_display_name" /> <!-- NOTE: Hide buttons to simplify the UI. Users can touch outside the dialog todismiss it.--> <!-- NOTE: ListPreference's summary should be set to its value by the activity code. --> <ListPreference android:defaultValue="-1" android:entries="@array/pref_example_list_titles" android:entryValues="@array/pref_example_list_values" android:key="example_list" android:negativeButtonText="@null" android:positiveButtonText="@null" android:title="@string/pref_title_add_friends_to_messages" /> </PreferenceScreen> values/strings_activity_settings.xml <resources> <!-- Strings related to Settings --> <!-- Example General settings --> <string name="pref_title_display_name">Display name</string> <string name="pref_default_display_name">John Smith</string> <string name="pref_title_add_friends_to_messages">Add friends to messages</string> <string-array name="pref_example_list_titles"> <item>Always</item> <item>When possible</item> <item>Never</item> </string-array> <string-array name="pref_example_list_values"> <item>1</item> <item>0</item> <item>-1</item> </string-array> </resources> NOTE: Actually I just want to comment like "Google's sample for PreferenceActivity is also interesting". But I haven't enough reputation points.So please don't blame me. (Sorry for bad English)