Intent intent = new Intent();
intent.setClassName("包名", "类名");
List<ResolveInfo> list = getContext().getPackageManager().queryIntentActivities(intent, 0);
if (list.size() == 0) {
// 说明系统中不存在这个activity
}
借鉴这篇文章的最后一条快速传送!嗖~