I have always used pocketsphinx for Hotword recognition in my app. The problem was it was too heavy on resources- especially battery. https://snowboy.kitt.ai/ is a great alternative.
Documentation: http://docs.kitt.ai/snowboy/
Github: https://github.com/kitt-ai/snowboy
Working implementation (from GITHUB): https://github.com/Kitt-AI/snowboy/raw/master/resources/alexa/SnowboyAlexaDemo.apk
Wrapper needed for Android. My budget is 100$.
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