Join Chiu-Ki Chan for an in-depth discussion in this video SharedPreferencesFavorites, part of Effective Android Testing for Mobile Developers.
- [Instructor] To start a favorites,…we are going to use shared preferences.…Go to the Java folder,…right-click on data local,…new Java class.…Call it shared preferences favorites.…Create a private final share preferences field.…It is not initialized yet,…so press Alt+Enter and say…initialize in constructor.…
Accept the default value of null for now.…To initialize it, we will need a context,…so we'll edit as a perimeter…to the constructor in line eight,…context context.…Then, go to the next line and replace null…with context.getSharedPreferences.…We'll give it the file name favorites.xml.…And then, we are going to call the mode…context.MODE_PRIVATE,…meaning that we do not want other apps…to have access to it.…
For favorites we will need three operations.…Get, to retrieve what is previously stored,…put, to stall a new value,…and then we'll have a convenience method toggle,…which retrieves the old value,…flip it from true to false or false to true,…and then put it inside the stall…and then return the value so that we can display it.…
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There's a difference between knowing how to implement testing and knowing when and why to do it. In this project-based course, get acquainted with best practices for testing Android apps by walking through a development workflow where testing is integrated throughout the process. As instructor Chiu-Ki Chan shows how to build the app, she explores the differences between JVM and on-device tests, explaining when to use each one. She also explores advanced techniques such as the MVP pattern. By demonstrating how testing fits into an app development workflow, she helps you bolster your ability to catch bugs—and determine where and when you should test.
- Why test?
- Local vs. on-device
- Code coverage
- UI testing
- Hermetic environment
- Dependency injection
- Testing with MVP
Skill Level Intermediate
1. Testing Considerations
2. Test as You Go
3. UI Testing
4. Hermetic Environment
5. Robot Pattern
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