title: bluetooth don't work in my app Android 6.0(API 23) to Android 7.0(API 24)
body: <p>I have a problem with bluetooth in my Android application.</p>
  
  <p>When I build my application with "API 23: Android 6.0" and less, the Bluetooth  works. However, when I build my application with "API 24: Android 7.0" and more, Bluetooth does not work.</p>
  
  <p>I use Android Studio 3.0.</p>