title: Which targetSDK to use for BLE?
body: <p>I’m building an Android app which should run on every device with Bluetooth Low Energy, which means a minSDK of 18. I’m not sure as to which targetSDK I should use however. I read online that it is good practice to always use the latest version for this (API 22). Is this the case, or should I build my application with every targetSDK that I support, i.e. build with the SDK 18 for applications that run API 18, build with SDK 19 for devices with API 19, …?</p>
  
  <p>I’m confused since to start a BLE discovery I can use either startScan() or startLeScan(). The Android documentation tells me: "startLeScan() was deprecated in API level 21, use startScan() instead". I’m unsure what impact this has on which targetSDK I should use to compile my app with. Will devices running API 18 will be able to run my app if I compile with SDK 22 and use startScan(), and will devices running API 22 be able to run my app if I compile with API 18 and use startLeScan()? Or should I really just build my application with every targetSDK that I support like mentioned above?</p>