Google Text-to-speech powers applications to read the text on your screen aloud. For example, it can be used by:
• Google Play Books to 'Read Aloud' your favourite book
• Google Translate to speak translations aloud so that you can hear the pronunciation of a word
• TalkBack and accessibility applications for spoken feedback across your device
• ... and many other applications in Play Store
To use Google Text-to-speech on your Android device, go to Settings > Language & Input > Text-to-speech output. Select Google Text-to-speech Engine as your preferred engine. Note, on many Android devices, Google Text-to-speech is already turned on, but you can update to the latest version here.