How to apply fast scroll using PreferenceActivity?
<PreferenceCategory android:title="@string/label_settingfirstcategory" android:key="first_category">
    <ListPreference
        android:key="updates_interval"
        android:title="@string/label_countrycode"
        android:summary="@string/label_countrycodesummary"
        android:entries="@array/countrycode"
        android:entryValues="@array/countrycode"

    />
</PreferenceCategory>

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