android 接收广播意图错误：java.lang.RuntimeException: Error receiving broadcast Intent { act=android.bluetoot

今天在调试毕设项目的时候，点击“搜索蓝牙”按钮，竟然无故运行停止，看了logcat信息为：

11-10 11:04:27.952 6381-6381/com.example.hyh.cgmms E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.hyh.cgmms, PID: 6381 java.lang.RuntimeException: Error receiving broadcast Intent { act=android.bluetooth.adapter.action.DISCOVERY_FINISHED flg=0x10 } in com.example.hyh.cgmms.Activity.BlueToothDeviceListActivity$1@42ac9c80 at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:808) at android.os.Handler.handleCallback(Handler.java:808) at android.os.Handler.dispatchMessage(Handler.java:103) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:5292) at java.lang.reflect.Method.invokeNative