使用 Google Volley 上传图片 [英] Upload an image using Google Volley

问题描述

我需要将我正在开发的应用程序中的图像上传到服务器，我想知道如何开发多部分请求以使用 Google Volley 加载图像.

I would need to upload an image from the application, that I'm developing, to the server and I would like to know how I can develop the Multipart Request to load the image using Google Volley.

谢谢

推荐答案

我有一个通过 Google Volley 上传图片的例子.看一看:

I have an example to upload images by Google Volley. Take a look:

package net.colaborativa.exampleapp.api;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;

import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.HttpHeaderParser;

public class PhotoMultipartRequest<T> extends Request<T> {


private static final String FILE_PART_NAME = "file";

private MultipartEntityBuilder mBuilder = MultipartEntityBuilder.create();
private final Response.Listener<T> mListener;
private final File mImageFile;
protected Map<String, String> headers;

public PhotoMultipartRequest(String url, ErrorListener errorListener, Listener<T> listener, File imageFile){
    super(Method.POST, url, errorListener);

    mListener = listener;
    mImageFile = imageFile;

    buildMultipartEntity();
}

@Override
public Map<String, String> getHeaders() throws AuthFailureError {
    Map<String, String> headers = super.getHeaders();

    if (headers == null
            || headers.equals(Collections.emptyMap())) {
        headers = new HashMap<String, String>();
    }

    headers.put("Accept", "application/json");

    return headers;
}

private void buildMultipartEntity(){
    mBuilder.addBinaryBody(FILE_PART_NAME, mImageFile, ContentType.create("image/jpeg"), mImageFile.getName());
    mBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
    mBuilder.setLaxMode().setBoundary("xx").setCharset(Charset.forName("UTF-8"));
}

@Override
public String getBodyContentType(){
    String contentTypeHeader = mBuilder.build().getContentType().getValue();
    return contentTypeHeader;
}

@Override
public byte[] getBody() throws AuthFailureError{
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    try {
        mBuilder.build().writeTo(bos);
    } catch (IOException e) {
        VolleyLog.e("IOException writing to ByteArrayOutputStream bos, building the multipart request.");
    }

    return bos.toByteArray();
}

@Override
protected Response<T> parseNetworkResponse(NetworkResponse response) {
    T result = null;
    return Response.success(result, HttpHeaderParser.parseCacheHeaders(response));
}

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

你可以这样使用它:

RequestQueue mQueue = Volley.newRequestQueue(context);
PhotoMultipartRequest imageUploadReq = new PhotoMultipartRequest(url, ErrorListener, Listener, imageFile);
mQueue.add(imageUploadReq);

我希望这些代码能激励你.

I hope these codes will inspire you.

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