LivedataObserve.kt

var mTodoTaskList : LiveData<List<TodoTask>> = mDatabase.todoTaskDao().getallTasks()
            mTodoTaskList.observe(
                    this ,
                    Observer<List<TodoTask>>() {
                        Log.d("List" , it?.size.toString())
                        if (it != null) {
                            mTodoTaskAdapters = TodoTaskAdapters(this , it)
                            mTaskRecyclerView.layoutManager = LinearLayoutManager(
                                    this.applicationContext ,
                                    LinearLayout.VERTICAL , false)
                            mTaskRecyclerView.adapter = mTodoTaskAdapters
                        }
                    } )