在网上找了半天的资料，终于搞定unity remote的连接了，主要参考这个帖子：http://answers.unity3d.com/questions/198853/unity-remote-for-android-not-working-solution.html
1.下载android sdk
2.unity->edit->preferences->external tools->android sdk location 设置android sdk的路径
3.unity->edit->project settings->editor->device 选择 any android device
4.下载unity remote 4 安装到手机
5.启动unity remote
6.重新启动unity，unity->edit->play
