修改显示 Preference summary 里的值, 显示Manifest 里的程序版本

<Preference
android:key="appVersion"
android:summary="1.3.08" />
</PreferenceCategory>

public String getVersionName() {
PackageInfo pInfo = null;
try {
pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
return pInfo.versionName;      ///或者 pInfo.versionCode;

} catch (PackageManager.NameNotFoundException e) {
throw new RuntimeException("Could not get package version name: " + e);
}
}

onCreate 在添加：

final Preference pref = getPreferenceManager().findPreference("appVersion");
pref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
pref.setSummary(newValue.toString());
return true;
}
});

//change preference version name;
pref.setSummary(getVersionName());