[Solved] Can not perform text to speech conversion in Android

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the problem turned out to be the max char size that can be passed to text to speech engine is about 4000 if your string contains more than 4000 characters it will not work

// this will not work 
tts.speak(text, TextToSpeech.QUEUE_ADD, null);

in order to get it working add an setOnUtteranceProgressListener and loop trough your string using onDone()

// working code
int char_count = 3000;
int start = 0;
int end = char_count;
HashMap<String, String> map = new HashMap<String, String>();
map.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "UniqueID");
tts.speak(text.substring(start, end), TextToSpeech.QUEUE_ADD, map);

tts.setOnUtteranceProgressListener(new UtteranceProgressListener() {
                        @Override
                        public void onStart(String s) {}

                        @Override
                        public void onDone(String s) {
                            start = end;
                            end+= char_count;
                            end = text.indexOf(" ", end);

                            if(end >= text.length() || end == -1){
                                end = text.length();
                            }if(start >= text.length()){
                                System.out.println("end of text");
                            }else {
                                speek();
                            }

                        }

                        @Override
                        public void onError(String s) {}
                    });

solved Can not perform text to speech conversion in Android