public class CustomMultiRequest extends Request<JSONObject> {

    private MultipartEntity entity = new MultipartEntity();

    private static final String FILE_PART_NAME = "postfieldname[]";

    private final Response.Listener<JSONObject> mListener;
    private final ArrayList<File> mFilePart;
    private final ArrayList<PostEntityModel> mStringPart;

    public CustomMultiRequest(String url, Response.ErrorListener errorListener, Response.Listener<JSONObject> listener,ArrayList<File> files, ArrayList<PostEntityModel> stringPart)
    {
        super(Method.POST, url, errorListener);
        mListener = listener;
        mFilePart = files;
        mStringPart = stringPart;
        buildMultipartEntity();
    }

    private void buildMultipartEntity()
    {
        for (File file : mFilePart){
           entity.addPart(FILE_PART_NAME, new FileBody(file));
        }
        try
        {
            for(PostEntityModel postEntityModel : mStringPart){
              entity.addPart(postEntityModel.getName(), new StringBody(postEntityModel.getValue()));
            }
        }
        catch (UnsupportedEncodingException e)
        {
            VolleyLog.e("UnsupportedEncodingException");
        }
    }

    @Override
    public String getBodyContentType()
    {
        return entity.getContentType().getValue();
    }

    @Override
    public byte[] getBody() throws AuthFailureError
    {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try
        {
            entity.writeTo(bos);
        }
        catch (IOException e)
        {
            VolleyLog.e("IOException writing to ByteArrayOutputStream");
        }
        return bos.toByteArray();
    }

    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response)
    {
        try {
            String jsonString = new String(response.data,
                    HttpHeaderParser.parseCharset(response.headers));
            return Response.success(new JSONObject(jsonString),
                    HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
    }

    @Override
    protected void deliverResponse(JSONObject response)
    {
        mListener.onResponse(response);
    }
}

如果使用Gradle，请将其添加到build.gradle文件中:

If you use Gradle, add this to your build.gradle file:

 compile('org.apache.httpcomponents:httpmime:4.3.6') {
    exclude module: 'httpclient'
}
compile 'org.apache.httpcomponents:httpclient-android:4.3.5'