安卓代码覆盖率:android studio+ gradle+jacoco

1. 在工程的oncreate()方法添加如下代码,目的是创建ec文件.

 String DEFAULT_COVERAGE_FILE_PATH = "/mnt/sdcard/coverage.ec";

        File file = new File(DEFAULT_COVERAGE_FILE_PATH);

        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

　　2.在工程的ondestory()方法添加如下代码,目的是写入数据.

				OutputStream out = null;
                try {
                    out = new FileOutputStream("/mnt/sdcard/coverage.ec", false);
                    Object agent = Class.forName("org.jacoco.agent.rt.RT")
                            .getMethod("getAgent")
                            .invoke(null);

                    out.write((byte[]) agent.getClass().getMethod("getExecutionData", boolean.class)
                            .invoke(agent, false));
                } catch (Exception e) {
                    Log.d(TAG, e.toString(), e);
                } finally {
                    if (out != null) {
                        try {
                            out.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
				}

　　

　　3.build里面增加如下内容,目的是为了生成报告.ec文件放在./build/outputs目录下.

apply plugin: 'jacoco'

task jacocoTestReport (type:JacocoReport) {

    group = "Reporting"

    description = "Generate Jacoco coverage reports on the  build."

    classDirectories = fileTree(

            dir: "${project.buildDir}/intermediates/classes",

            excludes: ['**/R.class',

                       '**/R$*.class',

                       '**/*$ViewInjector*.*',

                       '**/BuildConfig.*',

                       '**/Manifest*.*']

    )

    def coverageSourceDirs = [

            "src/main/java"

    ]

    additionalSourceDirs = files(coverageSourceDirs)

    sourceDirectories = files(coverageSourceDirs)

    executionData = fileTree(dir:'./build/outputs',include:'**/*.ec')

    reports {

        xml.enabled = true

        html.enabled = true

    }

}

　　

　　4. AndroidManifest.xml里面需要确认一下写sd的权限

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

　　

　　5.在build.gradle的buildTypes添加一行代码testCoverageEnabled = true

　　6.生成apk后,进行手动测试,测试完毕后使用adb pull /sdcard/coverage.ec d:\test 进行导出,然后将ec文件放到./build/outputs目录下,执行命令:gradlew jacocoTestReport,然后就可以看报告了.

　　同时,上面这个做法可以完美解决这个报错:

java.io.FileNotFoundException: /jacoco.exec: open failed: EROFS (Read-only file system)