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" />

实际上，CheckBoxPreference确实能够根据复选框值指定不同的摘要。请参阅android:summaryOff和android:summaryOn属性(以及相应的CheckBoxPreference方法)。

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。

只需将这一行添加到xml规范中。 应用:useSimpleSummaryProvider = " true "

例如:

< your.package.name.MyListPreference

android:key="noteInterval"
android:defaultValue="60"
android:title="Notification Interval"
android:entries="@array/noteInterval"
android:entryValues="@array/noteIntervalValues"
app:useSimpleSummaryProvider="true"

/>

这是我的解决方案……就其价值而言

package com.example.PrefTest;

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;
import android.preference.PreferenceGroup;
import android.preference.PreferenceManager;

public class Preferences extends PreferenceActivity implements
        OnSharedPreferenceChangeListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
        PreferenceManager.setDefaultValues(Preferences.this, R.xml.preferences,
            false);
        initSummary(getPreferenceScreen());
    }

    @Override
    protected void onResume() {
        super.onResume();
        // Set up a listener whenever a key changes
        getPreferenceScreen().getSharedPreferences()
                .registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // Unregister the listener whenever a key changes
        getPreferenceScreen().getSharedPreferences()
                .unregisterOnSharedPreferenceChangeListener(this);
    }

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

    private void initSummary(Preference p) {
        if (p instanceof PreferenceGroup) {
            PreferenceGroup pGrp = (PreferenceGroup) p;
            for (int i = 0; i < pGrp.getPreferenceCount(); i++) {
                initSummary(pGrp.getPreference(i));
            }
        } else {
            updatePrefSummary(p);
        }
    }

    private void updatePrefSummary(Preference p) {
        if (p instanceof ListPreference) {
            ListPreference listPref = (ListPreference) p;
            p.setSummary(listPref.getEntry());
        }
        if (p instanceof EditTextPreference) {
            EditTextPreference editTextPref = (EditTextPreference) p;
            if (p.getTitle().toString().toLowerCase().contains("password"))
            {
                p.setSummary("******");
            } else {
                p.setSummary(editTextPref.getText());
            }
        }
        if (p instanceof MultiSelectListPreference) {
            EditTextPreference editTextPref = (EditTextPreference) p;
            p.setSummary(editTextPref.getText());
        }
    }
}

如果你使用PreferenceFragment，这就是我解决它的方法。这是不言而喻的。

public static class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addPreferencesFromResource(R.xml.settings);
      getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onResume() {
      super.onResume();
      for (int i = 0; i < getPreferenceScreen().getPreferenceCount(); ++i) {
        Preference preference = getPreferenceScreen().getPreference(i);
        if (preference instanceof PreferenceGroup) {
          PreferenceGroup preferenceGroup = (PreferenceGroup) preference;
          for (int j = 0; j < preferenceGroup.getPreferenceCount(); ++j) {
            Preference singlePref = preferenceGroup.getPreference(j);
            updatePreference(singlePref, singlePref.getKey());
          }
        } else {
          updatePreference(preference, preference.getKey());
        }
      }
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
      updatePreference(findPreference(key), key);
    }

    private void updatePreference(Preference preference, String key) {
      if (preference == null) return;
      if (preference instanceof ListPreference) {
        ListPreference listPreference = (ListPreference) preference;
        listPreference.setSummary(listPreference.getEntry());
        return;
      }
      SharedPreferences sharedPrefs = getPreferenceManager().getSharedPreferences();
      preference.setSummary(sharedPrefs.getString(key, "Default"));
    }
  }