How can I use Google's text to speech to pause and resume with my string in android?

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Android

text-to-speech

Hello friends,
i want to customize google text to speech engine to pause and resume where ever i want.
I'm done with playing my text string to speech on button click and now i want to pause and resume the same.
Thanks

What I have tried:

Here i have broken my string into lines baes on dot or full stop

rr = new String[i];
rr = Html.fromHtml((String) mylarge_string_text_here).toString().split("\\.");

on button click i call:

Intent ttsInstallCheck = new Intent();
                     ttsInstallCheck.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(ttsInstallCheck, TTS_REQUEST_CODE);

//then it goes to init block where i have broken string and passed to speaking code

    public void onInit(int i) {
rr = new String[i];
rr = Html.fromHtml((String) mylarge_string_text_here).toString().split("\\.");

  a = rr[counter];
doSpeak(a);
}

private void doSpeak(String text) {
    try {
        HashMap<String, String> params = new HashMap<String, String>();
        // use the actual text as the key to ID the utterance
        params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID,text);
        tts.setLanguage(Locale.UK);
        tts.speak(text, TextToSpeech.QUEUE_FLUSH, params);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

      tts.setOnUtteranceCompletedListener(new TextToSpeech.OnUtteranceCompletedListener() {
                    @Override
                    public void onUtteranceCompleted(String utteranceId) {
//called when tts has finished speaking and againg called with new line and updated counter
                     Intent ttsInstallCheck = new Intent();                            ttsInstallCheck.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(ttsInstallCheck, TTS_REQUEST_CODE);
                });