what's the principle of uploading a file in android-async-http?

Question

I had a question when using android-async-http. After reading the source code, I knew about how to add a File or InputStream as a parameter into RequestParam. Then the RequestParam would be transferred into an AsyncHttpClient which would use RequestParam to get/put/post....Just like this:

String url = ...;
File file = ...;
ResponseHandlerInterface respHandler = ...;
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.add("upload_file", file);
client.get(url, params, respHandler);

As we all know, Files of any types are bits essentially. So when delivered over the internet, files could be transferred into a byte stream. But I didn't find any codes about this conversion. So, I wonder how android-async-http completes this, or did I miss something when reading source codes?

you may look into [this](http://stackoverflow.com/a/26210781/1761003) — Maveňツ, Mar 09 '15 at 06:42
@maveň, Sorry, I didn't think it resolved my question. Thank you all the same. — SilentKnight, Mar 09 '15 at 06:54
@maveň, how does android-async-http complete the conversion from file/inputstream to bytes stream before parameters are submitted to the server? — SilentKnight, Mar 09 '15 at 07:35

SilentKnight · Accepted Answer · 2015-03-10T10:19:15.867

I thought I found the way android-async-http handled with files/inputstreams. Uploading a file depends on the call of put(?)/post(?), but not get(?). By searching the overwrited methods of put(?)/post(?), you will find paramsToEntity(RequestParams, ResponseHandlerInterface) which will return a HttpEntity. And then, HttpPost/HttpPut will setEntity(HttpEntity). Because get(?)s don't support uploading files, then you can't find operations about uploading files in get(?)s.

what's the principle of uploading a file in android-async-http?

1 Answers1