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我需要将图像上传到某个 URL。经典的 HTTP 请求构建看起来像这样：

            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            HttpPost httpPost = new HttpPost(
                    getString(R.string.WebServiceURL)
                            + "/cfc/iphonewebservice.cfc?method=uploadPhoto");

            MultipartEntity entity = new MultipartEntity(
                    HttpMultipartMode.BROWSER_COMPATIBLE);

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bitmap.compress(CompressFormat.JPEG, 100, bos);
            byte[] data = bos.toByteArray();
            entity.addPart("photoId", new StringBody(getIntent()
                    .getStringExtra("photoId")));
            entity.addPart("returnformat", new StringBody("json"));
            entity.addPart("uploaded", new ByteArrayBody(data,
                    "myImage.jpg"));
            entity.addPart("photoCaption", new StringBody(caption.getText()
                    .toString()));
            httpPost.setEntity(entity);

简而言之，假设我需要做的是使用httpPost.setEntity()方法将图像放入请求中。

我已经知道如何使用 Volley 库构建请求；必须重写类中的getBody方法com.android.volley.Request，例如：

public byte[] getBody() throws AuthFailureError {
    JsonObject json = new JsonObject();
    Set<String> keySet = mParameters.keySet();
    for (String key : keySet) {
        json.addProperty(key, mParameters.get(key));
    }

    return json.toString().getBytes();
}

现在的问题是如何在Request类中设置实体？没有像setEntity().

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