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System services not available to Activities before onCreate()
java.lang.IllegalStateException: System services not available to Activities before onCreate()	at android.app.Activity.getSystemService(Activity.java:4745)	at com.example.nunog.myapplication12.GPSTracker.getLocation(GPSTracker.java:52)	at com.example.nunog.myapplication12.GPSTracker.(GPSTracker.java:47)	at com.example.nunog.myapplication12.Anomaly.abnormalHRDetected(Anomaly.java:24)	at com.example.nunog.myapplication12.BleActivityOld.getHeartRate(BleActivityOld.java:129)	at com.example.nunog.myapplication12.BluetoothLeService.getHeartRate(BluetoothLeService.java:136)	at com.example.nunog.myapplication12.BluetoothLeService.broadcastUpdate(BluetoothLeService.java:155)	at com.example.nunog.myapplication12.BluetoothLeService.access$500(BluetoothLeService.java:21)	at com.example.nunog.myapplication12.BluetoothLeService$1.onCharacteristicChanged(BluetoothLeService.java:130)	at android.bluetooth.BluetoothGatt$1.onNotify(BluetoothGatt.java:423)	at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:403)	at android.os.Binder.execTransact(Binder.java:404)	at dalvik.system.NativeStart.run(Native Method)