Sending images using Http Post

Question

I want to send an image from the android client to the Django server using Http Post  The image is chosen from the gallery  At present  I am using list value name Pairs to send the necessary data to the server and receiving responses from Django in JSON  Can the same approach be used for images  with urls for images embedded in JSON responses     Also  which is a better method  accessing images remotely without downloading them from the server or downloading and storing them in a Bitmap array and using them locally  The images are few in number   lt 10  and small in size  50 50 dip    Any tutorial to tackle these problems would be much appreciated    Edit  The images chosen from the gallery are sent to the server after scaling it to required size

User · Answer

I struggled a lot trying to implement posting a image from Android client to servlet using httpclient-4 3 5 jar  httpcore-4 3 2 jar  httpmime-4 3 5 jar  I always got a runtime error  I found out that basically you cannot use these jars with Android as Google is using older version of HttpClient in Android  The explanation is here http   hc apache org httpcomponents-client-4 3 x android-port html  You need to get the httpclientandroidlib-1 2 1 jar from android http-client library  Then change your imports from or apache http client to ch boye httpclientandroidlib  Hope this helps

User · Answer

I m going to assume that you know the path and filename of the image that you want to upload  Add this string to your NameValuePair using image as the key-name   Sending images can be done using the HttpComponents libraries  Download the latest HttpClient   currently 4 0 1  binary with dependencies package and copy apache-mime4j-0 6 jar and httpmime-4 0 1 jar to your project and add them to your Java build path   You will need to add the following imports to your class   import org apache http entity mime HttpMultipartMode  import org apache http entity mime MultipartEntity  import org apache http entity mime content FileBody  import org apache http entity mime content StringBody    Now you can create a MultipartEntity to attach an image to your POST request  The following code shows an example of how to do this   public void post String url  List lt NameValuePair gt  nameValuePairs        HttpClient httpClient   new DefaultHttpClient        HttpContext localContext   new BasicHttpContext        HttpPost httpPost   new HttpPost url        try           MultipartEntity entity   new MultipartEntity HttpMultipartMode BROWSER COMPATIBLE            for int index 0  index  lt  nameValuePairs size    index                  if nameValuePairs get index  getName   equalsIgnoreCase  image                         If the key equals to  image   we use FileBody to transfer the data                 entity addPart nameValuePairs get index  getName    new FileBody new File  nameValuePairs get index  getValue                     else                      Normal string data                 entity addPart nameValuePairs get index  getName    new StringBody nameValuePairs get index  getValue                                       httpPost setEntity entity            HttpResponse response   httpClient execute httpPost  localContext         catch  IOException e            e printStackTrace              I hope this helps you a bit in the right direction

User · Answer

I usually do this in the thread handling the json response   try     Bitmap bitmap   BitmapFactory decodeStream  InputStream new URL imageUrl  getContent       catch  MalformedURLException e      e printStackTrace      catch  IOException e      e printStackTrace        If you need to do transformations on the image  you ll want to create a Drawable instead of a Bitmap

User · Answer

The loopj library can be used straight-forward for this purpose   SyncHttpClient client   new SyncHttpClient    RequestParams params   new RequestParams    params put  text    some string    params put  image   new File imagePath     client post  http   example com   params  new TextHttpResponseHandler        Override   public void onFailure int statusCode  Header   headers  String responseString  Throwable throwable           error handling         Override   public void onSuccess int statusCode  Header   headers  String responseString           success           http   loopj com

User · Answer

Version 4 3 5 Updated Code    httpclient-4 3 5 jar  httpcore-4 3 2 jar  httpmime-4 3 5 jar   Since MultipartEntity has been deprecated  Please see the code below   String responseBody    failure   HttpClient client   new DefaultHttpClient    client getParams   setParameter CoreProtocolPNames PROTOCOL VERSION  HttpVersion HTTP 1 1    String url   WWPApi URL USERS  Map lt String  String gt  map   new HashMap lt String  String gt     map put  user id   String valueOf userId    map put  action    update    url   addQueryParams map  url    HttpPost post   new HttpPost url   post addHeader  Accept    application json     MultipartEntityBuilder builder   MultipartEntityBuilder create    builder setCharset MIME UTF8 CHARSET    if  career    null      builder addTextBody  career   career  ContentType create  text plain   MIME UTF8 CHARSET    if  gender    null      builder addTextBody  gender   gender  ContentType create  text plain   MIME UTF8 CHARSET    if  username    null      builder addTextBody  username   username  ContentType create  text plain   MIME UTF8 CHARSET    if  email    null      builder addTextBody  email   email  ContentType create  text plain   MIME UTF8 CHARSET    if  password    null      builder addTextBody  password   password  ContentType create  text plain   MIME UTF8 CHARSET    if  country    null      builder addTextBody  country   country  ContentType create  text plain   MIME UTF8 CHARSET    if  file    null      builder addBinaryBody  Filedata   file  ContentType MULTIPART FORM DATA  file getName      post setEntity builder build      try       responseBody   EntityUtils toString client execute post  getEntity     UTF-8        System out println  Response from Server    gt      responseBody        JSONObject object   new JSONObject responseBody       Boolean success   object optBoolean  success        String message   object optString  error         if   success            responseBody   message        else           responseBody    success            catch  Exception e        e printStackTrace      finally       client getConnectionManager   shutdown

[android] Sending images using Http Post

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