Fitness.getRecordingClient(this,GoogleSignIn.getAccountForExtension(this,fitnessOptions)).subscribe(DataType.TYPE_STEP_COUNT_CUMULATIVE).addOnSuccessListener{Log.i(TAG,"Subscription was successful!")}.addOnFailureListener{e->
Log.w(TAG,"There was a problem subscribing ",e)}
Google Fit 會儲存訂閱的步數資料 (即使應用程式並未儲存)
並在系統重新啟動時還原訂閱項目。應用程式可以
讀取每日總步數
從使用者的健身記錄中取得