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Posting Images using Android

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What are post requests?
How can I post data using Android when I have Google Volley implemented?
Uploading images in HTTP using Android.

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Posting Images using Android

  1. 1. Uploading Images in HTTP Using Android By Ali Muzaffar http://alimuzaffar.com
  2. 2. Posting Data over HTTP When you post data in using HTTP, you have 2 content type options: - multipart/form-data - application/x-www-form-urlencoded Both formats transfer plain text over http. The main difference is how the data is formatted.
  3. 3. Posting Data over HTTP  The default format used when posting data is x-www- form-urlencoded.  There is a common misconception that form-data is the default format.
  4. 4. Format of post using x-www…  x-www-form-urlencoded posts data using a format similar to (actually the same as) url parameters. This is just a standard, the body can contain data in any format as long as your backend is setup to handle it. POST /my-api/customer/address/ HTTP/1.1 Host: my-server.com.au Cache-Control: no-cache Content-Type: application/x-www-form-urlencoded NewShipping%5BfirstName%5D=Kiwi&NewShipping%5BlastName%5D=Jones&NewShipping%5Baddress1%5D= Some+Place&NewShipping%5Baddress2%5D=In+New+Zealand&NewShipping%5Btown%5D=1842%2C+Surfdale %2C+Waiheke+Island&NewShipping%5Bphone%5D=12345678&NewShipping%5Bcountry%5D=171&ShippingAd dressOption=1&NewShipping%5Bgender%5D=male&NewShipping%5BbirthdayDay%5D=1&NewShipping%5Bbi rthdayMonth%5D=2&NewShipping%5BbirthdayYear%5D=1942
  5. 5. Format of post using form- data Form-data posts data using very structured data format. The body must be in this format.  It’s “multipart” because each section can have it’s own headers allowing for different types of data to be transmitted. POST /my-api/customer/address/ HTTP/1.1 Host: my-server.com.au Cache-Control: no-cache ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="products[0][p]" AT049AA59TWQ ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="products[0][image]”; Content-Type: image/png; filename=“product_image.png”; <base64 encoded image> ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="products[0][gift_wrap_num]" 0 ----WebKitFormBoundaryE19zNvXGzXaLvS5C
  6. 6. Images and Password  Base64 encoded.  Plain HTTP username and password are base 64 encoded and added to the headers.  “username:password” is the format (similar to apache htaccess.  Key: Authorize  Value: Basic <Base64>  Images, by default are Base64 encoded in the form-data format.  Content-Type and filename can he optionally specified for the “part” that contains the image.
  7. 7. Uploading Images Using Volley  Volley by default uses application/x-www-form- urlencoded format.  Certain services may require a multipart/form-data post.  Simple MultipartRequest for Google Volley  We fallback to using direct HTTP, but what do you do if you’re using Volley?
  8. 8. Uploading images bypassing Volley  Reuse your HttpStack implementation, create a new instance of HttpStack and use it to get your HttpClient.  Use the HttpClient to build a multipart post.  Example code here:  https://gist.github.com/alphamu/7190a8ed0986b5fb8376
  9. 9. Thank you  MultipartRequest for Google Volley  https://gist.github.com/alphamu/684d8ae311d95831ce1c  Sample SslHttpStack implementation and Uploading images using it.  https://gist.github.com/alphamu/7190a8ed0986b5fb8376  Learn more about multipart messages:  http://en.wikipedia.org/wiki/MIME#Multipart_message s

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