垃圾书：杨丰盛的《Android应用开发揭秘》

sorry, I can't write Chinese now.

I am not the writer. Before I discuss this topic to you, I didn't read this book and example.

you didn't answer my question, did you see "Scanning" in the phone after you remove the loop?

Our topic is "do we need the loop in this bluetooth discovery code"

here is your first message:

接下来那段死循环就纯属多余！！代码判断_discoveryFinished为true时结束死循环，但这个死循环什么都没做啊。
事实上，完全可以把这段垃圾代码删除。

这个循环保证在扫描蓝牙的时候显示"Scanning",怎么是没有用的？

你还是没有回答我的问题，到底看没看见"Scanning"?

咱们回到你的第一帖子，你说这本书不好，然后举了一个循环的例子来作证，说这个循环没有用，可以删掉。才把我吸引过来的。

To Kangfu: 没试过，也没时间。不过从代码看，如果这个循环没有的话，“Scanning"窗口会很快消失。但cloixio的意思是说dialog.dismiss()这行代码正确的写法应放在回调里，也就是回调的时候消除它，这样压根就不需要用那个死循环的方式来保持住这个”scanning"窗口。也就是说前面的用法就错了，这个循环只是再次用错误的方法来解决这个前面的错误。

对这段代码存在的问题，本人赞同cloixio的观点，确实写的不好。只不过不太喜欢用这样的方式来挑错，如果我是作者我也会很尴尬。

I think there is no problem in book's example code.

I guess the author wants wait all bluetooth devices are discovered, then show every  thing in one time. this is very common way to convert asynchronous function to synchronous function. and this is very good for beginner to understand startDiscovery().

for expert, of cause, loop is not needed, expert might handle call back function to show the bluetooth device one by one. but it is different story.

we should support IT books which made in China, even we know Chinese IT book writer need improve themselves, we should support and encourage them, and don't say "Chinese translator are always bad...."

sorry I cannot input chinese