By Ken Kousen
Android followed Gradle because the most well-liked construct automation method many years in the past, yet many Android builders are nonetheless unusual with this open resource instrument. This hands-on consultant offers a suite of Gradle recipes that will help you fast and simply accomplish the most typical construct initiatives on your Android apps. You’ll tips on how to customise undertaking layouts, upload dependencies, and generate many alternative types of your app.
Gradle relies on Groovy, but little or no wisdom of the JVM language is needed that you can start. Code examples use Android SDK model 23, with emulators from Marshmallow (Android 6) or Lollipop (Android 5). If you’re ok with Java and Android, you’re ready.
- Understand Gradle’s generated construct documents for Android apps
- Run Gradle from the command line or inside of Android Studio
- Add extra Java libraries on your Android app
- Import and export Eclipse ADT projects
- Digitally signal a free up APK for the Google Play store
- Use product flavors to construct many types of an analogous app
- Add customized projects to the Gradle construct process
- Test either your app’s Android and non-Android components
- Improve the functionality of your Gradle build
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Extra resources for Gradle Recipes for Android: Master the New Build System for Android
12' This is the shortcut form used in the default build file. It is legal, though not recommended, to specify a version number with a plus sign, as shown in Example 1-16. Example 1-16. 0 is required to compile the project’s tests. While this works, it makes the build less deterministic and therefore less reproducible. Explicit version numbers also protect you from changes in later versions of a particular API. Favor explicit version numbers for dependencies. This protects you from later changes in dependent libraries and makes your build reproducible.
Properties file, or set them on the command line using the -P flag. ” This makes it easy to define a variable value once and use it throughout the file. These properties can be hardcoded into the build file if you wish. Example 2-1 is a sample from a Gradle build file from the Android Annotations project. Example 2-1. androidannotations:androidannotations-api:$AAVersion" } 29 Normal Groovy idioms apply here, meaning that the variable AAVersion is untyped but takes on a String value at assignment, and that the variable is interpolated into the two Groovy string dependencies.
Figure 1-10. Android Studio offering to synchronize project dependencies After clicking the SycNow link, the downloaded libraries appear in the External Libraries section of the project window (Figure 1-11). Figure 1-11. External Libraries In this case, the retrofit dependency also added the okhttp and okio libraries as transitive dependencies, as shown in Figure 1-12. If you miss your opportunity to click the Sync Now link, Android Studio provides a special icon in the toolbar for the same purpose, as well as a menu item.