EditTextPreference:

public class MyEditTextPreference extends EditTextPreference {
    public MyEditTextPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

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

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);
    }

}

我的选择是扩展ListPreference，它是干净的:

public class ListPreferenceShowSummary extends ListPreference {

    private final static String TAG = ListPreferenceShowSummary.class.getName();

    public ListPreferenceShowSummary(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public ListPreferenceShowSummary(Context context) {
        super(context);
        init();
    }

    private void init() {

        setOnPreferenceChangeListener(new OnPreferenceChangeListener() {

            @Override
            public boolean onPreferenceChange(Preference arg0, Object arg1) {
                arg0.setSummary(getEntry());
                return true;
            }
        });
    }

    @Override
    public CharSequence getSummary() {
        return super.getEntry();
    }
}

然后你添加你的settings.xml:

<yourpackage.ListPreferenceShowSummary
    android:key="key" android:title="title"
    android:entries="@array/entries" android:entryValues="@array/values"
    android:defaultValue="first value"/>

我解决了这个问题与以下后代的ListPreference:

public class EnumPreference extends ListPreference {

    public EnumPreference(Context aContext, AttributeSet attrs) {
        super(aContext,attrs);
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        setSummary(getEntry());
        return super.onCreateView(parent);
    }

    @Override
    protected boolean persistString(String aNewValue) {
        if (super.persistString(aNewValue)) {
            setSummary(getEntry());
            notifyChanged();
            return true;
        } else {
            return false;
        }
    }
}

从1.6到4.0.4，我似乎工作得很好。

也许像ListPreference:修改getSummary来得到你想要的:

package your.package.preference;

import android.content.Context;
import android.util.AttributeSet;

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

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

        public EditTextPreference(Context context) {
            super(context);
        }

        @Override
        public CharSequence getSummary() {
            if(super.getSummary() == null) return null;

            String summary = super.getSummary().toString();
            return String.format(summary, getText());
        }
    }

在你的xml中使用这个:

<your.package.EditTextPreference
                android:key="pref_alpha"
                android:summary="Actual value: %s"
                android:title="Title"
                android:defaultValue="default"
                />

因此，您可以使用%s而不是实际值编写摘要。

简单:

listPreference.setSummary("%s");