Starter code for Android Basics codelab - Store the data in a ViewModel
Unscramble is a single player game app that displays scrambled words. To play the game, player has to make a word using all the letters from the displayed scrambled word.
Used in the [Android Basics with Kotlin](https://developer.android .com/courses/android-basics-kotlin/course) course.
You need to know:
- Knowledge about Fragments.
- How to design a layout in ConstraintLayout.
- Able to write control flow statements (if / else, when statements).
- Able to update the UI of the app based on user input.
- Able to add a click listener to a Button.
- Download and run the app.
First codelab: Summary View model The Android app architecture guidelines recommend separating classes that have different responsibilities and driving the UI from a model. A UI controller is a UI-based class like Activity or Fragment. UI controllers should only contain logic that handles UI and operating system interactions; they shouldn't be the source of data to be displayed in the UI. Put that data and any related logic in a ViewModel. The ViewModel class stores and manages UI-related data. The ViewModel class allows data to survive configuration changes such as screen rotations. ViewModel is one of the recommended Android Architecture Components.
Second codelab: Summary LiveData LiveData holds data; LiveData is a wrapper that can be used with any data LiveData is observable, which means that an observer is notified when the data held by the LiveData object changes. LiveData is lifecycle-aware. When you attach an observer to the LiveData, the observer is associated with a LifecycleOwner (usually an Activity or Fragment). The LiveData only updates observers that are in an active lifecycle state such as STARTED or RESUMED. You can read more about LiveData and observation here. Apps can listen to the LiveData changes from the layout using Data Binding and binding expressions. Binding expressions are written within the layout in the attribute properties (such as android:text) referencing the layout properties.
Copyright (C) 2020 The Android Open Source Project.
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.