Download binary file from OKHTTP

For what it's worth, I would recommend response.body().source() from okio (since OkHttp is already supporting it natively) in order to enjoy an easier way to manipulate a large quantity of data that can come when downloading a file.

@Overridepublic void onResponse(Call call, Response response) throws IOException {    File downloadedFile = new File(context.getCacheDir(), filename);    BufferedSink sink = Okio.buffer(Okio.sink(downloadedFile));    sink.writeAll(response.body().source());    sink.close();}

A couple of advantages taken from the documentation in comparison with InputStream:

This interface is functionally equivalent to InputStream.InputStream requires multiple layers when consumed data is heterogeneous: a DataInputStream for primitive values, a BufferedInputStream for buffering, and InputStreamReader for strings. This class uses BufferedSource for all of the above.Source avoids the impossible-to-implement available() method. Instead callers specify how many bytes they require.

Source omits the unsafe-to-compose mark and reset state that's tracked by InputStream; callers instead just buffer what they need.

When implementing a source, you need not worry about the single-byte read method that is awkward to implement efficiently and that returns one of 257 possible values.

And source has a stronger skip method: BufferedSource.skip(long) won't return prematurely.

Getting ByteStream from OKHTTP

I've been digging around in the Documentation of OkHttp you need to go this way

use this method :

response.body().byteStream() wich will return an InputStream

so you can simply use a BufferedReader or any other alternative

OkHttpClient client = new OkHttpClient();request = new Request.Builder().url("URL string here")                     .addHeader("X-CSRFToken", csrftoken)                     .addHeader("Content-Type", "application/json")                     .build();response = getClient().newCall(request).execute();InputStream in = response.body().byteStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));String result, line = reader.readLine();result = line;while((line = reader.readLine()) != null) {    result += line;}System.out.println(result);response.body().close();

The best option to download (based on source code "okio")

private void download(@NonNull String url, @NonNull File destFile) throws IOException {    Request request = new Request.Builder().url(url).build();    Response response = okHttpClient.newCall(request).execute();    ResponseBody body = response.body();    long contentLength = body.contentLength();    BufferedSource source = body.source();    BufferedSink sink = Okio.buffer(Okio.sink(destFile));    Buffer sinkBuffer = sink.buffer();    long totalBytesRead = 0;    int bufferSize = 8 * 1024;    for (long bytesRead; (bytesRead = source.read(sinkBuffer, bufferSize)) != -1; ) {        sink.emit();        totalBytesRead += bytesRead;        int progress = (int) ((totalBytesRead * 100) / contentLength);        publishProgress(progress);    }    sink.flush();    sink.close();    source.close();}