<Preference
                android:summary="@string/pref_gender_voice_summary"
                android:title="@string/pref_gender_voice_title">
                <intent android:action="com.android.settings.TTS_SETTINGS"></intent>
            </Preference>

Intent intent = new Intent();

    intent.setAction("com.android.settings.TTS_SETTINGS");
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    startActivity(intent);

// launch the google tts engine voice settings
Intent intent = new Intent();
intent.setPackage("com.google.android.tts");
intent.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
startActivity(intent);