Example of using Travis CI with Codecov in a multi-module Android project

.travis.yml

language: android
jdk: oraclejdk8

before_install:
  - mkdir "$ANDROID_HOME/licenses" || true
  - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
  - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"

script:
    - ./gradlew check
    - ./gradlew jacocoTestReport

after_success:
    - bash <(curl -s https://codecov.io/bash)

android:
  components:
      - tools
      - tools
      - platform-tools
      - build-tools-25.0.3 #Edit this with your buildToolsVersion
      - android-25 #Edit this with your targetSdkVersion

  licenses:
      - android-sdk-license-.+
      - '.+'

Additional.txt

To get rid of the "Permission denied" error caused by the execution of the gradlew file, use the following code to update its execution permissions.

>> git update-index --chmod=+x gradlew
>> git ls-tree HEAD
>> git update-index --chmod=+x gradlew
>> git commit -m "permission access for travis"
>> git ls-tree HEAD

build.gradle

//Project's build.gradle file

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3' // Use your own version of tools here
        classpath 'com.dicedmelon.gradle:jacoco-android:0.1.2' // Add this line

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

build.gradle (2)

//Example of using jacoco with a library (use it respectively)

apply plugin: 'com.android.library'
apply plugin: 'jacoco-android' // Add this line

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        debug{ //Add this debug section
            testCoverageEnabled true
        }
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.2.0'
    testCompile 'junit:junit:4.12'
}

// Finally add this block
jacocoAndroidUnitTestReport {
    csv.enabled false
    html.enabled true
    xml.enabled true
}

Instructions.txt

To build the solution above:

- Open the terminal in Android Studio
- Navigate to the folder which contains the project's build.gradle file (optional)
- Type "gradlew check jacocoTestReport"

As a result, you will find the reports in the folder YOUR_PROJECT_NAME/YOUR_MODULE_NAME/build/reports/jacoco
By using the .travis.yml file above you can be sure that you will find a report at https://codecov.io (on successful Travis CI build)