activate() method create android speechRecognizer and ask permission for android 6+ version. Do not forget to add uses-permission android:name="android.permission.RECORD_AUDIO" permission to manifest
activate();
Listen method start listening your voice, and send result as List of Strings
listen();
When you call cancel, recognition canceled
cancel();
Call when you need to stop speechRecognition and destroy it
destroy();
When you call stop, recognition stopped and send result as List of String
stop();