shrikant_arts:
actually i have to submit this project on tuesday.
so thats the reason im stressed out so far.
no comment 
just now i have checked it with an app
and asyou said written the code( BTserial.print();
but im unable to get any voice from the app?
my bluetooth connection is working.
You need to be more specific. This will also help you to trouble shoot more systematically.
You have not explained what you mean with „checked it with an app“. I assume you mean a serial terminal app? I assume you mean you are able to receive serial text on your android phone? Was the check successful or not?
If not - are you able to receive serial text on your PC?
If not - have you tried with the hardware serial?
If not - have you tried with the bluetooth example sketches?
my bluetooth connection is working
What does that mean? Was the pairing successful? Was the serial transmission successful?
Take it step by step.
First make sure the serial is actually working. Only when you are 100% sure about this, then you can start to worry about the TTS app. BTW, this TTS app has not been updated for 4 years. Who knows if it still works on your android. Check the baud rate settings on the TTS app. Contact the developer of the app.