Android 单元测试覆盖率计算

在工程下面的build.gradle 增加配置1.增加Pluginapply plugin: 'jacoco'2. 增加jacoco版本

jacoco{
version "0.7.4.201502262128"
}

3.申明一个gradle task

//jacocoTestReport依赖于connectedAndroidTest task，所以在执行jacoco之前需要先执行connectedAndroidTest，也就是说需要连接测试机（模拟器or真机）
task jacocoTestReport(type:JacocoReport,dependsOn:"connectedAndroidTest"){
group = "Reporting"
description = "Generate Jacoco coverage reports after running tests."
reports{
xml.enabled = false
html.enabled = true
csv.enabled = false
}
classDirectories = fileTree(
dir : "$buildDir/intermediates/classes/debug",
excludes : [
'**/*Test.class',
'**/R.class',
'**/R$*.class',
'**/BuildConfig.*',
'**/Manifest*.*'
]
)
def coverageSourceDirs = ['src/main/java']
additionalSourceDirs = files(coverageSourceDirs)
sourceDirectories = files(coverageSourceDirs)
additionalClassDirs = files(coverageSourceDirs)
executionData = files("$buildDir/outputs/code-coverage/connected/coverage.ec")
}

　　4. 打开testCoverageEnabled

buildTypes {
debug {
testCoverageEnabled = true
}
}

　　

5. 完整的配置

apply plugin: 'com.android.application'
apply plugin: 'jacoco'android {
compileSdkVersion 25
buildToolsVersion "26.0.2"
defaultConfig {
applicationId "com.example.androidunittest"
minSdkVersion 15
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
testCoverageEnabled = true
}
buildTypes {
debug {
testCoverageEnabled = true
}
}jacoco{
version "0.7.4.201502262128"
}}//jacocoTestReport依赖于connectedAndroidTest task，所以在执行jacoco之前需要先执行connectedAndroidTest，也就是说需要连接测试机（模拟器or真机）
task jacocoTestReport(type:JacocoReport,dependsOn:"connectedAndroidTest"){
group = "Reporting"
description = "Generate Jacoco coverage reports after running tests."
reports{
xml.enabled = false
html.enabled = true
csv.enabled = false
}
classDirectories = fileTree(
dir : "$buildDir/intermediates/classes/debug",
excludes : [
'**/*Test.class',
'**/R.class',
'**/R$*.class',
'**/BuildConfig.*',
'**/Manifest*.*'
]
)
def coverageSourceDirs = ['src/main/java']
additionalSourceDirs = files(coverageSourceDirs)
sourceDirectories = files(coverageSourceDirs)
additionalClassDirs = files(coverageSourceDirs)
executionData = files("$buildDir/outputs/code-coverage/connected/coverage.ec")
}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-v7:23.1.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'androidTestCompile 'com.android.support.test:runner:0.5'
androidTestCompile 'com.android.support.test:rules:0.5'
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'}
}

　　6. 运行报告gradlew jacocoTestReport运行生成报告命令可能出现的问题1). Could not find com.android.tools.build:gradle:2.2.3解决方法：

buildscript {
repositories {
mavenCentral()
jcenter()
}

dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
}

}

　　2). Unsupported major.minor version 52.0解决方法：参考：http://blog.csdn.net/it_talk/article/details/50267573