如何在PreferenceScreen中添加按钮？

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory android:title="Category Title">
        <Preference
            android:key="button_preference"
            android:title="Button Preference"
            android:summary="Click to perform an action" />
    </PreferenceCategory>
</PreferenceScreen>

public class MySettingsActivity extends PreferenceActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
    }
}