Sourabh Sourabh -4 years ago 889
Android Question

OKHTTP 3 Tracking Multipart upload progress

How can I track progress of upload in OkHttp 3
I can find answers for v2 but not v3, like this

A sample Multipart request from OkHttp recipes

private static final String IMGUR_CLIENT_ID = "...";
private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");

private final OkHttpClient client = new OkHttpClient();

public void run() throws Exception {
// Use the imgur image upload API as documented at
RequestBody requestBody = new MultipartBody.Builder()
.addFormDataPart("title", "Square Logo")
.addFormDataPart("image", "logo-square.png",
RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))

Request request = new Request.Builder()
.header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)

Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);


Answer Source

Wrap your MultiPart RequestBody in this RequestBody with instance of Listener and Voila!

public class ProgressRequestBody extends RequestBody {

    protected RequestBody mDelegate;
    protected Listener mListener;
    protected CountingSink mCountingSink;

    public ProgressRequestBody(RequestBody delegate, Listener listener) {
        mDelegate = delegate;
        mListener = listener;

    public MediaType contentType() {
        return mDelegate.contentType();

    public long contentLength() {
        try {
            return mDelegate.contentLength();
        } catch (IOException e) {
        return -1;

    public void writeTo(BufferedSink sink) throws IOException {
        mCountingSink = new CountingSink(sink);
        BufferedSink bufferedSink = Okio.buffer(mCountingSink);

    protected final class CountingSink extends ForwardingSink {
        private long bytesWritten = 0;
        public CountingSink(Sink delegate) {
        public void write(Buffer source, long byteCount) throws IOException {
            super.write(source, byteCount);
            bytesWritten += byteCount;
            mListener.onProgress((int) (100F * bytesWritten / contentLength()));

    public interface Listener {
        void onProgress(int progress);
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