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Learn how Android protects you at every turn. Hands-free navigation and messaging. Just connect your phone and go. A powerful experience for entry-level smartphones.

Built with new apps that expand what's possible. Screen readers, speech-to-text and some of the newest ways to experience the world your way. The newest OS updates.

The biggest announcements. The most recent platform news. Management API. Other Resources. Before you begin To prepare your app, complete the steps in the following sections. App prerequisites Make sure that your app's build file uses the following values: A minSdkVersion of 19 of higher A compileSdkVersion of 28 or higher Set up your game in Google Play Console The Google Play Console is where you manage Google Play games services for your game, and configure metadata for authorizing and authenticating your game.

Configure your app In your project-level build. Step 1: Download the sample app For this developer guide, you will need to download the Type-a-Number Challenge sample Android application. To download and set up the sample application in Android Studio: Download the Android samples from the samples download page. Import the android-basic-samples project.

This project includes TypeANumber and other Android game samples. Browse to the directory where you downloaded android-basic-samples on your development machine. The new package name must not start with com. Step 2: Set up the game in the Google Play Console The Google Play Console is where you manage Google Play games services for your game, and configure metadata for authorizing and authenticating your game. If you haven't registered for the Google Play Console before, you will be prompted to do so.

These folders are known as source sets. Source sets are folders containing source code for your app. The source sets, which are colored green androidTest and test contain your tests.

When you create a new Android project, you get the following three source sets by default. They are:. The difference between local tests and instrumented tests is in the way they are run.

These tests are run locally on your development machine's JVM and do not require an emulator or physical device. Because of this, they run fast, but their fidelity is lower, meaning they act less like they would in the real world.

These tests run on real or emulated Android devices, so they reflect what will happen in the real world, but are also much slower. In Android Studio instrumented tests are represented by an Android with a green and red triangle icon. You should see the following output in the Run window at the bottom of the screen:. Android uses the testing library JUnit for testing in this codelab JUnit4.

Both, assertions and the Test annotation come from JUnit. An assertion is the core of your test. It's a code statement that checks that your code or app behaved as expected.

To see what a failed test looks like add an assertion that you can easily see should fail. Unlike the local test, this test runs on a device in the example below an emulated Pixel 2 phone :.

If you have a device attached or an emulator running, you should see the test run on the emulator. In this task, you'll write tests for getActiveAndCompleteStats , which calculates the percentage of active and complete task stats for you app. You can see these numbers on the statistics screen of the app. StatsResult is a data class that contains two numbers, the percentage of tasks that are completed , and the percentage that are active.

Android Studio gives you tools to generate test stubs the help you implement the tests for this function. You'll be making a local test because your function is doing math calculations and won't include any Android specific code.

So, there's no need to run it on a real or emulated device. Because your tests act as documentation of what your code does, it's nice when they are human readable. Compare the following two assertions:. The second assertion reads much more like a human sentence. It is written using an assertion framework called Hamcrest. Another good tool for writing readable assertions is the Truth library. You'll be using Hamcrest in this codelab to write assertions. Usually, you use implementation when adding a dependency, yet here you're using testImplementation.

When you're ready to share your app with the world, it is best not to bloat the size of your APK with any of the test code or dependencies in your app. You can designate whether a library should be included in the main or test code by using gradle configurations. The most common configurations are:. This means that Hamcrest will only be available in the test source set. It also ensures that Hamcrest will not be included in your final app. Note you can use the import import org.

This codelab will not teach you all the ins and outs of Hamcrest, so if you'd like to learn more check out the official tutorial. In this task, you'll write more tests using JUnit and Hamcrest. You'll also write tests using a strategy derived from the program practice of Test Driven Development. Test Driven Development or TDD is a school of programming thought that says instead of writing your feature code first, you write your tests first. Then you write your feature code with the goal of passing your tests.

The code for the getActiveAndCompletedStats as written has a bug. Notice how it does not properly handle what happens if the list is empty or null. In both of these cases, both percentages should be zero. To fix the code and write tests, you'll use test driven development. Test Driven Development follows these steps. Instead of starting by fixing the bug, you'll start by writing the tests first. Then you can confirm that you have tests protecting you from ever accidentally reintroducing these bugs in the future.

Great job with the basics of writing and running tests! Next you'll learn how to write basic ViewModel and LiveData tests. In the rest of the codelab, you'll learn how to write tests for two Android classes that are common across most apps— ViewModel and LiveData.

You are going to focus on tests that have all their logic in the view model and do not rely on repository code. Repository code involves asynchronous code, databases, and network calls, which all add test complexity.

You're going to avoid that for now and focus on writing tests for ViewModel functionality that doesn't directly test any thing in the repository.

The test you'll write will check that when you call the addNewTask method, the Event for opening the new task window is fired. Revision 1 August Initial release for Android 6. Android 5. Revision 1 March Initial release for Android 5. Revision 2 December Updated layouts in the Support Library and fixed various issues. Revision 1 October Initial release for Android 5. Android 4. Revision 2 October Updated the rendering library. Revision 1 June Initial release for Android Wear.

Revision 2 December Maintenance release. Revision 1 October Initial release. Revision 2 August Maintenance update. Revision 1 July Initial release. Revision 2 February Maintenance update. Dependencies: SDK Tools r21 or higher is required. Revision 1 November Initial release. Android direct download google play store play store play store for android.

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