ActivityThread: performLaunchActivity().java

ComponentName component = r.intent.getComponent();
if (component == null) {
    component = r.intent.resolveActivity(
       mInitialApplication.getPackageManager());
    r.intent.setComponent(component);
}

if (r.activityInfo.targetActivity != null) {
    component = new ComponentName(r.activityInfo.packageName,
            r.activityInfo.targetActivity);
}

ContextImpl appContext = createBaseContextForActivity(r);