Huang Ke Yuan

java.lang.RuntimeException: Unable to start receiver com.polidea.rxandroidble2.sample.example1a_background_scanning.ScanReceiver: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference at android.app.ActivityThread.handleReceiver(ActivityThread.java:4315) at android.app.ActivityThread.-$$Nest$mhandleReceiver(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2153) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:201)...