如何使用 okhttp 将验证代码放入 imageView？

Question

Request request = new Request.Builder()
                   .url(url)
                   .addHeader("Cookie", "JSESSIONID="+sessionId)
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
    InputStream inputStream = response.body().byteStream();
    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
    imageView.setImageBitmap(bitmap);
}

我使用 okhttp3 构建一个带有 cookie 和 session 的请求，response.body() 是验证代码。 inputStream 不为空，但位图为空。我试过下面的方法，但是位图也是空的。

private Bitmap convertBitmap(final Response response) throws IOException {
    InputStream inputStream = response.body().byteStream();
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    byte[] bmp_buffer;
    int len = 0;
    while ((len = inputStream.read(buffer)) != -1) {
        outStream.write(buffer, 0, len);
    }
    outStream.close();
    inputStream.close();
    bmp_buffer = outStream.toByteArray();
    return BitmapFactory.decodeByteArray(bmp_buffer, 0, bmp_buffer.length);
}

Answer 1

我建议使用 Picasso 直接在 ImageView 中下载图片。

毕加索图书馆主页示例：

String imgUrl = "http://i.imgur.com/DvpvklR.png";
Picasso.with(context).load(imgUrl).into(imageView);

另外，您可以在图片下载时放置占位符：

Picasso.with(context).load(imgUrl).placeholder(R.drawable.placeholder).into(imageView);

如果下载失败，放错误图片：

Picasso.with(context).load(imgUrl).error(R.drawable.error_image).into(imageView);

带有 cookie 的完整代码：

OkHttpClient client = new OkHttpClient();
client.interceptors().add(new Interceptor {  

    @Override  
    public Response intercept(Chain chain) throws IOException {  
        Request.Builder request = chain.request().newBuilder();  
        request.addHeader("Cookie", "JSESSIONID="+sessionId);  
        return chain.proceed(request.build());  
    }  
});  

CookieManager cookieManager = new CookieManager();
cookieManager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);
client.setCookieHandler(cookieManager);

// Create the downloader for Picasso to use
OkHttpDownloader downloader = new OkHttpDownloader(client);
Picasso picasso = new Picasso.Builder(context).downloader(downloader).build();

picasso.load(imgUrl).placeholder(R.drawable.placeholder).error(R.drawable.error_image).into(imageView);