Introduction.Android.md

id	title
Introduction.Android	Detox for Android

Setup

Detox 7 was updated to support Android gradle plugin 3.0.0. This is a breaking change that makes it impossible to support previous Android gradle plugin versions.

https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html

For older Android gradle plugin support use detox@6.x.x instead (previous setup guide here).
Detox 6 will not continue to be updated, to continue getting updates and features, update your Android gradle config and migrate to Detox 7.

1. Do the initial setup described in the Getting Started Guide

• Getting Started

2. Add Detox dependency to an Android project

In android/settings.gradle add:

include ':detox'
project(':detox').projectDir = new File(rootProject.projectDir, '../node_modules/detox/android/detox')

In android/app/build.gradle add this to defaultConfig section:

  defaultConfig {
      ...
      testBuildType System.getProperty('testBuildType', 'debug')  //this will later be used to control the test apk build type
      missingDimensionStrategy "minReactNative", "minReactNative46" //read note
      testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      ...
  }

Please be aware that the minSdkVersion needs to be at least 18.

Choosing the right build type (in missingDimensionStrategy)

Detox runs on multiple React Native versions, choose the correct build type to support the version you use.
Available versions:

• minReactNative44: Support for React Native 0.44-0.45
• minReactNative46: Support for React Native 0.46+

In android/app/build.gradle add this in dependencies section:

dependencies {
	...
    androidTestImplementation(project(path: ":detox"))
    androidTestImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test:rules:1.0.1'
    ...
}

And in the same file you need to add this under allprojects > repositories:

buildscript {
    repositories {
	     ...
        google()
        ...
    }
}

3. Create Android Test class

You need to add the file android/app/src/androidTest/java/com/[your.package]/DetoxTest.java and fill it like this, expect that you need to change the package to your projects name.

4. Add Android configuration

Add this part to your package.json:

"detox" : {
    "configurations": {
        "android.emu.debug": {
            "binaryPath": "android/app/build/outputs/apk/debug/app-debug.apk",
            "build":
            "cd android && ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug && cd ..",
            "type": "android.emulator",
            "name": "Nexus_5X_API_24"
        },
        "android.emu.release": {
            "binaryPath": "android/app/build/outputs/apk/release/app-release.apk",
            "build":
            "cd android && ./gradlew assembleRelease assembleAndroidTest -DtestBuildType=release && cd ..",
            "type": "android.emulator",
            "name": "Nexus_5X_API_26"
        }
    }
}

Pay attention to -DtestBuildType, set either to debug or release according to the main apk type.

Following device types could be used to control Android devices:

android.emulator. Boot stock SDK emulator with provided name, for example Nexus_5X_API_25. After booting connect to it.

android.attached. Connect to already-attached android device. The device should be listed in the output of adb devices command under provided name. Use this type to connect to Genymotion emulator.

5. Run the tests

Using the android.emu.debug configuration from above, you can invoke it in the standard way.

detox test -c android.emu.debug

Troubleshooting

Problem: Duplicate files copied in ...

If you get an error like this:

Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/LICENSE

You need to add this to the android section of your android/app/build.gradle:

packagingOptions {
    exclude 'META-INF/LICENSE'
}