apply plugin: 'com.android.application'
apply plugin: 'jacoco' //加载代码覆盖库jacoco

jacoco {
    toolVersion = "0.7.9" //代码覆盖库jacoco版本号
}

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.whh.initmvp"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            testCoverageEnabled = true //实现代码覆盖率
            minifyEnabled false //获取代码覆盖率需要设为false （**如果混肴文件配置完毕，设为true也可**）
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            testCoverageEnabled = true //实现代码覆盖率
            minifyEnabled false //获取代码覆盖率需要设为false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'

   //.....(此处忽略若干依赖库)

    //代码覆盖率jacoco(可不引入)
//    compile 'org.jacoco:org.jacoco.core:0.7.9'

}

//代码覆盖率相关配置 start
def coverageSourceDirs = [
        '../app/src/main/java'
]

task jacocoTestReport(type: JacocoReport) {
    group = "Reporting"
    description = "Generate Jacoco coverage reports after running tests."

    reports {
        xml.enabled = true
        html.enabled = true
    }

    classDirectories = fileTree(
            //检测覆盖率的class所在目录(以项目class所在目录为准)
            dir: './build/intermediates/classes/debug', //gradle2.3 class所在目录
            //gradle3.2 class所在目录 dir: './build/intermediates/javac/debug/compileDebugJavaWithJavac/classes',
            //增加以上目录中不需要检测的文件列表
            excludes: ['**/R*.class',
                       '**/*$InjectAdapter.class',
                       '**/*$ModuleAdapter.class',
                       '**/*$ViewInjector*.class'
            ]
    )

    sourceDirectories = files(coverageSourceDirs) //设置需要检测覆盖率的目录
    executionData = files("$buildDir/outputs/code-coverage/connected/code_coverage.ec") //存储APP运行时产生报告的路径
}
//代码覆盖率相关配置 end

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

//生成报告的所在SDcard目录
    public static String DEFAULT_COVERAGE_FILE_PATH = Environment.getExternalStorageDirectory()+"/";
    private static final String TAG = "MainActivity";

    @Override
    protected void onStop() {
        generateCoverageFile();
        super.onStop();

    }

 /**
     * 生成executionData
     */
    public void generateCoverageFile() {

        OutputStream out = null;


        try {
            out = new FileOutputStream(DEFAULT_COVERAGE_FILE_PATH + "/code_coverage.ec", false); //在SDcard根目录下生产检测报告，文件名自定义
            Object agent = Class.forName("org.jacoco.agent.rt.RT").getMethod("getAgent").invoke(null);
            // 这里之下就统计不到了
            out.write((byte[]) agent.getClass().getMethod("getExecutionData", boolean.class).invoke(agent, false));

            Log.i("whh", "GenerateCoverageFile success");
        } catch (Exception e) {
            Log.i("whh", "GenerateCoverageFile Exception:" + e.toString());

        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

adb pull /sdcard/code_coverage.ec

executionData = files("$buildDir/outputs/code-coverage/connected/code_coverage.ec")