FM: add headset detection logic using AudioManager API

 Check if current audioManager outputDevice list contains
 WIRED_HEADSET or WIRED_HEADPHONES device.

CRs-Fixed: 2438531
Change-Id: I7321d9eb24e84481cdebf6312b8e3ea1382b4950

fmapp2/src/com/caf/fmradio/FMRadioService.java

@@ -288,7 +288,16 @@ public class FMRadioService extends Service
       getA2dpStatusAtStart();
 
       mGainFocusReq = requestAudioFocus();
-
+      AudioManager mAudioManager =
+          (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+      AudioDeviceInfo[] deviceList = mAudioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS);
+      for (int index = 0; index < deviceList.length; index++) {
+          if ((deviceList[index].getType() == AudioDeviceInfo.TYPE_WIRED_HEADSET ) ||
+                   (deviceList[index].getType() == AudioDeviceInfo.TYPE_WIRED_HEADPHONES )){
+              mHeadsetPlugged = true;
+              break;
+          }
+      }
    }
 
    @Override