kailLinux 所支持的网卡的型号 最好是TP-link 或IP-Time

 在数百次搜索覆盖报告的答案后，我终于找到了我想要的确切答案。 
 
 在这篇博文中 ，我发现gradlew createDebugCoverageReport创建了jacoco覆盖率报告。 
 
 另外，从gradle插件源代码中 ，该插件默认使用jacoco 0.6.2.201302030002。 （因此，如果要使用默认版本，则不需要jacoco版本定义 ） 
 
 总之，使用Android gradle插件获取jacoco覆盖率报告的基本步骤是： 
 
 
 
 Android Gradle插件版本为0.10.0或更高版本（通常在您项目的build.gradle ） 
 
 
 将testCoverageEnabled true添加到您想要的构建类型（即debug ） 
 
 
 运行$ gradlew createDebugCoverageReport或gradlew connectedCheck以获得jacoco覆盖率报告。 
 
 
 您可以在build/reports/coverage/{buildType}找到您的覆盖率报告。 （即为调试版本build/reports/coverage/debug ） 
 
 （从@ odiggity的评论中添加多种风味的情况） 
 
 如果您的项目使用多风格配置，请改用create{flavorName}CoverageReport 。 覆盖报告将在build/reports/coverage/{flavorName}/{buildType} 。 
 
 具有调试版本类型的风味krInternal的示例： 
 
 
 
 命令： ./gradlew createKrInternalDebugCoverageReport 
 
 
 报告详述如下： build/reports/coverage/krInternal/debug 
 
 
 小费 ： 
 
 由于您只能使用device with root permission的emulator和device with root permission获取覆盖率报告，因此在常规（无根）设备上运行命令后会出现以下错误： 
 
05:48:33 E/Device: Error during Sync: Permission denied                         
java.io.IOException: com.android.ddmlib.SyncException: Permission denied
    at com.android.builder.testing.ConnectedDevice.pullFile(ConnectedDevice.java:114)
    at com.android.builder.internal.testing.SimpleTestCallable.call(SimpleTestCallable.java:158)
    at com.android.builder.internal.testing.SimpleTestCallable.call(SimpleTestCallable.java:42)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:695)   
Caused by: com.android.ddmlib.SyncException: Permission denied
    at com.android.ddmlib.SyncService.doPullFile(SyncService.java:511)
    at com.android.ddmlib.SyncService.pullFile(SyncService.java:320)
    at com.android.ddmlib.Device.pullFile(Device.java:849)
    at com.android.builder.testing.ConnectedDevice.pullFile(ConnectedDevice.java:107)
    ... 10 more                
:myDirections:connectedAndroidTest FAILED      

FAILURE: Build failed with an exception.

Over the hundreds of times searching the answer to getting a coverage report, I finally found an exact answer what I want.
 
From the this blog post, I found that gradlew createDebugCoverageReport creates the jacoco coverage report. 
 
Also, from the gradle plugin source code, the plugin uses jacoco 0.6.2.201302030002 by default. (therefore, jacoco version definition is not required if you are going to use a default version)
 
In summary, the ESSENTIAL steps to get a jacoco coverage report with Android gradle plugin are:
 
 
 
Android gradle plugin version 0.10.0 or higher (typically in your project's build.gradle)
 
 
add testCoverageEnabled true to the build type you want (i.e. debug) 
 
 
run $ gradlew createDebugCoverageReport or gradlew connectedCheck to get a jacoco coverage report.
 
 
You can find your coverage report at the build/reports/coverage/{buildType}. (i.e. build/reports/coverage/debug for debug build)
 
(Add multi-flavor case from @odiggity's comment)
 
If your project uses multi-flavor configuration, use create{flavorName}CoverageReport instead. The coverage report will be generated at build/reports/coverage/{flavorName}/{buildType}.
 
Example for flavor krInternal with debug build type:
 
 
 
Command: ./gradlew createKrInternalDebugCoverageReport 
 
 
Report is genarated at: build/reports/coverage/krInternal/debug
 
 
Tip :
 
Since you can only get a coverage report with the emulator and device with root permission, you'll get following error after running a command on the regular(non-rooted) device:
 
05:48:33 E/Device: Error during Sync: Permission denied                         
java.io.IOException: com.android.ddmlib.SyncException: Permission denied
    at com.android.builder.testing.ConnectedDevice.pullFile(ConnectedDevice.java:114)
    at com.android.builder.internal.testing.SimpleTestCallable.call(SimpleTestCallable.java:158)
    at com.android.builder.internal.testing.SimpleTestCallable.call(SimpleTestCallable.java:42)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:695)   
Caused by: com.android.ddmlib.SyncException: Permission denied
    at com.android.ddmlib.SyncService.doPullFile(SyncService.java:511)
    at com.android.ddmlib.SyncService.pullFile(SyncService.java:320)
    at com.android.ddmlib.Device.pullFile(Device.java:849)
    at com.android.builder.testing.ConnectedDevice.pullFile(ConnectedDevice.java:107)
    ... 10 more                
:myDirections:connectedAndroidTest FAILED      

FAILURE: Build failed with an exception.
 
Travis-CI build script to get code coverage
 
Include this block in build.gradle, for all modules (library, sample, etc)
 
android {
    lintOptions {
        abortOnError false
    }
}
 
Below is the .travis-ci.yml file
 
language: android
jdk: oraclejdk8
sudo: required

android:
  components:
  # Uncomment the lines below if you want to
  # use the latest revision of Android SDK Tools
  - tools
  - platform-tools
  # The BuildTools version used by your project
  - build-tools-28.0.3
  # The SDK version used to compile your project
  - android-28
  - android-22
  - add-on
  # Additional components
  - extra-google-google_play_services
  - extra-android-support
  - extra-google-m2repository
  - extra-android-m2repository
  # Specify at least one system image,
  # if you need to run emulator(s) during your tests
  - sys-img-armeabi-v7a-android-22

  licenses:
  - 'android-sdk-preview-license-52d11cd2'
  - 'android-sdk-license-.+'
  - 'google-gdk-license-.+'

before_cache:
- rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
- rm -fr $HOME/.gradle/caches/*/plugin-resolution/

cache:
  directories:
    - $HOME/.gradle/caches/
    - $HOME/.gradle/wrapper/
    - $HOME/.android/build-cache

before_install:
- yes | sdkmanager "build-tools;28.0.3"

before_script:
- echo no | android create avd --force -n test -t android-22 --abi armeabi-v7a -c 100M
- emulator -avd test -no-audio -no-window &
- android-wait-for-emulator
- sleep 180
- adb devices
- adb shell input keyevent 82 &

script:
- ./gradlew build connectedCheck

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