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README.md

Gradle

Repository for Gradle plugins used by the Catrobat Project.

Contains the following plugins:

  • android-emulators-gradle allows to create, start, and stop emulators via gradle. The emulators themselves as well as their dependencies like Android SDK and Android NDK can be installed automatically.

android-emulators-gradle Plugin

This plugin allows to manage Android emulators via gradle:

  • Creating Android images.
  • Starting an Android Emulator.
  • Turning off animations.
  • Stopping an emulator.
  • Automatically retrieves the logcat file.
  • Android SDK can be installed automatically.
  • Android NDK can be installed automatically.
  • The necessary Android images as well as the emulator can be installed automatically.
  • Emulator templates avoid redundancies in your emulator specification.

Gradle Commands

Command Description
./gradlew startEmulator [-Pemulator=EMULATOR_NAME] [-PlogcatFile=LOGCAT_NAME] [-Pverbose=boolean] [-Pci] Creates the emulator if necessary, then starts it, and disables animations globally. If you configured multiple emulators you need to select which via -Pemulator. The logcat file is automatically stored as logcat.txt. An emulator window will be shown by default, unless this runs on Jenkins or -Pci is used.
./gradlew startEmulatorWithAnimations [-Pemulator=EMULATOR_NAME] [-PlogcatFile=LOGCAT_NAME] [-Pverbose=boolean] [-Pci] Like startEmulator but enables global animations.
./gradlew stopEmulator Stops the first emulator it finds. Running multiple emulators at the same time is not supported.
./gradlew adbDisableAnimationsGlobally Turns-off animations of the first running emulator it finds.
./gradlew adbResetAnimationsGlobally Turns-on animations of the first running emulator it finds.
./gradlew clearAvdStore Clears all AVDs in the AVD store, which can be useful to save space or to force their recreation.
./gradlew listEmulators Lists all emulators that can be started via startEmulator.

Basic Emulator Managment

Place the following lines in your build.gradle file.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'org.catrobat.gradle.androidemulators:android-emulators-gradle:1.4.0'
    }
}

// Place this at the very top.
// This ensures that the dependencies (if you install them) are present
// when other plugins try to access them.
emulators {
    // Whether to install the dependencies or not.
    // The dependencies are installed during the configuration step.
    // As a result you should not always install them, to not slow down configuration.
    // The install function takes a boolean whether to install the dependencies or not.
    install project.hasProperty('installSdk')

    dependencies {
        sdk() // install the most recent Android SDK known by the plugin.
    }

    // Name the emulator you want to create, here it is called android24
    emulator 'android24', {
        avd {
            systemImage = 'system-images;android-24;default;x86_64'
            sdcardSizeMb = 200
            hardwareProperties += ['hw.ramSize': 800, 'vm.heapSize': 128]
            screenDensity = 'xhdpi' // the plugin automatically maps xhdpi to the correct screen density
        }

        // Parameters that are used to start the emulator.
        // Some sensible defaults are provided automatically, see EmulatorStarter.groovy
        parameters {
            resolution = '768x1280'
            language = 'en'
            country = 'US'
        }
    }
}

Calling ./gradlew -PinstallSdk in your project will install the dependencies automatically. Afterwards you can create and start the emulator with ./gradlew startEmulator adbDisableAnimationsGlobally with animations disabled. Finally you can stop the emulator with ./gradlew stopEmulator.

Multiple Emulators and Templates

When you need multiple emulators you often and up with a lot duplication between their configuration. Templates can help here.

emulators {
    install project.hasProperty('installSdk')

    dependencies {
        sdk()
    }

    // Specify a template like any other emulator.
    emulatorTemplate 'englishTemplate', {
        avd {
            sdcardSizeMb = 200
            hardwareProperties += ['hw.ramSize': 800, 'vm.heapSize': 128]
            screenDensity = 'xhdpi'
        }

        parameters {
            resolution = '768x1280'
            language = 'en'
            country = 'US'
        }
    }

    // Now reference the template as second parameter.
    emulator 'android24', 'englishTemplate', {
        // You only need to provide what you want to override.
        avd {
            systemImage = 'system-images;android-24;default;x86_64'
        }
    }

    // Alternatively emulators can also act as template.
    emulator 'android25uk', 'android24', {
        avd {
            systemImage = 'system-images;android-25;default;x86_64'
        }
        parameters {
            country = 'UK'
        }
    }

    defaultEmulator = 'android24'

    // By default the plugin tries to determine automatically whether to show the emulator window or to hide it.
    // On Jenkins the emulator will be hidden, while it will be shown on local systems.
    // You can change the default by setting showWindow.
    // In any case you can hide the emulator window by using the parameter -Pci
    showWindow = false
}

When you have configured multiple emulators you need to specify which emulator to start, for example, ./gradlew -Pemulator=android24 startEmulator. Alternatively you can specify a defaultEmulator.

Known Shortcomings

  • Only one emulator can be started at the same time.

Development

When developing it is beneficial to try your changes with an existing Android project. To do that increment the plugin version number and install the gradle plugin locally via ./gradlew publishToMavenLocal. Afterwards you need to make sure the local maven repository is used in your Android project via

repositories {
    mavenLocal()
}

in the build.gradle file of your Android project.

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