使用Emma做Android覆盖率的实践

现在方案

• 方案实现原理：
  基于Android的BroadCast方案，定义特定的消息，然后使用反射的方式使用android sdk中本身的emma获取coverage.ec数据并保存在/mnt/sdcard中，随时操作随时获取

1. 将此类放入到代码中，类代码如下：

// package net.sf.andbatdog.batterydog.EmmaInstrument;
package com.qa.emma;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.util.Log;
 
import java.lang.Exception;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
 
public class InstrumentedReceiver extends BroadcastReceiver {
    public static String TAG = "EMMACoverageReport";
    private static final String DEFAULT_COVERAGE_FILE_PATH = "/mnt/sdcard/coverage.ec";
 
    private void reportEmmaError(Exception e) {
        reportEmmaError("", e);
    }
 
    private void reportEmmaError(String hint, Exception e) {
        String msg = "Failed to generate emma coverage. " + hint;
        Log.e(TAG, msg, e);
    }
    private void generateCoverageReport() {
        Log.d(TAG, "generateCoverageReport()");
        java.io.File coverageFile = new java.io.File(DEFAULT_COVERAGE_FILE_PATH);
 
        try {
            Class<?> emmaRTClass = Class.forName("com.vladium.emma.rt.RT");
            Method dumpCoverageMethod = emmaRTClass.getMethod(
                    "dumpCoverageData", coverageFile.getClass(), boolean.class,
                    boolean.class);
            dumpCoverageMethod.invoke(null, coverageFile, true, false);
        } catch (ClassNotFoundException e) {
            reportEmmaError("Emma.jar not in the class path?", e);
        } catch (Exception e){
            reportEmmaError(e);
        }
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        generateCoverageReport();
    }
}

2. 编辑AndroidManifest.xml文件：

1. 增加SDCard的写权限
2. 增加BroadCast的通知映射

<receiver android:name="com.qa.emma.InstrumentedReceiver">
    <intent-filter>
    <action android:name="com.qa.emma.COLLECT_COVERAGE"/>
    </intent-filter>
</receiver>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

3. 编译
ant instrument

4. 安装
ant installi

5. 执行测试用例

6. 发送BroadCast通知获取结果

7. 获取 coverage.ec

8. 生成报告
保证自己在代码路径下，执行如下命令:

这样就可以看到coverage目录下的index.html来打开覆盖率文件