Test wheter an activity is the main or not.

gistfile1.java

private boolean isMain() {
    boolean result = false;

    Intent intent = getPackageManager().getLaunchIntentForPackage(getPackageName());
    List<ResolveInfo> info = getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
    if (!info.isEmpty()) {
        result = info.get(0).activityInfo.name.equals(getComponentName().getClassName());
    }

    return result;
}