MultipartDataBuilder

Lightweight library for post multipart data with HttpUrlConnection in Android. You can add text fields, files from file system or files from any InputStream. It simple to use:

//Make our connection
URL url = new URL("http://httpbin.org/post");
connection = (HttpURLConnection) url.openConnection();

//Make builder with connection and charset
new MultipartDataBuilder(connection, "UTF-8")
    //Add fields
    .addFormField("Form1", "I am Form 1")
    .addFormField("Form2", "I am Form 2")
    //Sending file as InputStream.
    .addFormFile("FormFile1", new MultipartDataBuilder.BinaryField("testfile.txt") {
        @Override
        public InputStream openStream() throws IOException {
            return getAssets().open("my_asset.txt");
        }
    })
    //Or you can send simple file like this:
    .addFormFile("Field",new File("/sdcard/myfile.jpg"))
    //Or add byte array
    .addFormFile("Field", new byte[]{1,2,3,4,5}, "myfile.jpg"))
    //Post data
    .build();

InputStream in = connection.getInputStream();
//Analyze server response

Include library in your project with .gradle file:

//Make sure, what jcenter() exists in repositories
repositories {
    jcenter()
}

dependencies {
    //Your project dependencies here
    compile 'org.velmax.multipartdata:builder:1.0.1'
}