Android Multipart Upload

Question

As part of my Android app, I'd like to upload bitmaps to be remotely stored. I have simple HTTP GET and POST communication working perfectly, but documentation on how to do a multipart POST seems to be as rare as unicorns.

Furthermore, I'd like to transmit the image directly from memory, instead of working with a file. In the example code below, I'm getting a byte array from a file to be used later on with HttpClient and MultipartEntity.

    File input = new File("climb.jpg");
    byte[] data = new byte[(int)input.length()];
    FileInputStream fis = new FileInputStream(input);
    fis.read(data);

    ByteArrayPartSource baps = new ByteArrayPartSource(input.getName(), data);

This all seems fairly clear to me, except that I can't for the life of me find out where to get this ByteArrayPartSource. I have linked to the httpclient and httpmime JAR files, but no dice. I hear that the package structure changed drastically between HttpClient 3.x and 4.x.

Is anyone using this ByteArrayPartSource in Android, and how did they import it?

After digging around in the documentation and scouring the Internet, I came up with something that fit my needs. To make a multipart request such as a form POST, the following code did the trick for me:

    File input = new File("climb.jpg");

    DefaultHttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost("http://localhost:3000/routes");
    MultipartEntity multi = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
    String line;

    multi.addPart("name", new StringBody("test"));
    multi.addPart("grade", new StringBody("test"));
    multi.addPart("quality", new StringBody("test"));
    multi.addPart("latitude", new StringBody("40.74"));
    multi.addPart("longitude", new StringBody("40.74"));
    multi.addPart("photo", new FileBody(input));
    post.setEntity(multi);

    HttpResponse resp = client.execute(post);

The HTTPMultipartMode.BROWSER_COMPATIBLE bit is very important. Thanks to Radomir's blog on this one.

Answer 1

try this:

 HttpClient httpClient = new DefaultHttpClient() ;

 HttpPost httpPost = new HttpPost("http://example.com");
 MultipartEntity entity = new MultipartEntity();     
 entity.addPart("file", new FileBody(file));
 httpPost.setEntity(entity );
 HttpResponse response = null;

 try {
     response = httpClient.execute(httpPost);
 } catch (ClientProtocolException e) {
     Log.e("ClientProtocolException : "+e, e.getMessage());         
 } catch (IOException e) {
     Log.e("IOException : "+e, e.getMessage());

 } 

Answer 2

Perhaps you can do following step to import library into your Android.

requirement library - apache-mime4j-0.6.jar - httpmime-4.0.1.jar

1. Right click your project and click properties
2. select java build path
3. select tab called "Order and Export"
4. Apply it
5. Fully uninstall you apk file with the adb uninstall due to existing apk not cater for new library
6. install again your apk
7. run it

Thanks,

Jenz