How to Make Multipart POST Requests with Volley in Android After HttpEntity's Removal?

Multipart POST Requests with Volley and the Absence of HttpEntity

In Android API22, HttpEntity was deprecated and removed entirely in API23. This article provides a working sample to implement a POST multipart request with Volley without HttpEntity. The proposed solution is tested with Asp.Net Web API.

Implementation Details

The code consists of two classes:

MultipartActivity.java:

1. Parses drawable files into byte arrays.
2. Constructs a multipart request body with the byte arrays.
3. Creates a MultipartRequest object and adds it to a request queue.

MultipartRequest.java:

1. Extends the Request class and implements the necessary methods.
2. Handles the request headers, content type, and body.
3. Parses the network response and delivers it to the listener.

Additional Features

Adding Text Parts:

As suggested in the provided code, one can add text parts to the multipart request using the getParams() method:

@Override
protected Map<String, String> getParams() {
    Map<String, String> params = new HashMap<>();
    params.put("param1", "value1");
    params.put("param2", "value2");
    return params;
}

Modular Code for Reusability:

To enhance reusability, the code has been refactored:

class VolleyMultipartRequest extends Request<NetworkResponse>  {

    // ... other methods

    @Override
    protected Map<String, DataPart> getByteData() {
        // ... code for adding byte parts
    }
}

Usage Example:

VolleyMultipartRequest request = new VolleyMultipartRequest(Method.POST, url, new Response.Listener<NetworkResponse>() {
    // ... listener code
}, new Response.ErrorListener() {
    // ... error listener code
}) {
    @Override
    protected Map<String, String> getParams() {
        // ...
    }
    @Override
    protected Map<String, DataPart> getByteData() {
        // ...
    }
};

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