Intent resolved to different process in Espresso test for APK (without source code)

问题

I'm trying to launch an activity(of another APK) via instrumentation object. I'm able to pull the class of that APK in classToInvestigate object but cannot start the activity through

instrumentation.startActivitySync(startIntent2);

Below is the complete code of launching activity via instrumentation object.

private Object xyz(String packageName, String className){
        Object plugin = null;
        try {
            PackageManager packageManager = context.getPackageManager();
            ApplicationInfo appInfo = packageManager.getApplicationInfo(packageName, 0);
            DexFile df = new DexFile(appInfo.sourceDir);
            ClassLoader cl = context.getClassLoader();
            Class classToInvestigate = df.loadClass(className, cl);

            Intent startIntent2 = new Intent(Intent.ACTION_MAIN);
            startIntent2.setClassName(packageName, classToInvestigate.getName());
            startIntent2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            instrumentation.startActivitySync(startIntent2);
            instrumentation.waitForIdleSync();


            plugin = classToInvestigate.newInstance();


        } catch (Exception e) {
            System.out.println("EXCEPTION");
        }
        finally{
            return plugin;
        }
    }

Specifically at line instrumentation.startActivitySync(startIntent2); the Android studio throws an error

java.lang.RuntimeException: Intent in process com.main.apk resolved to different process com.abc.xyz Intent

来源：https://stackoverflow.com/questions/55721618/intent-resolved-to-different-process-in-espresso-test-for-apk-without-source-co