我有这个网址https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3
。在 Blob 存储中,此 URL 地址上有一个 PNG 图像,可在 REST API 上无需任何标头(通常)即可访问。它可以从网络浏览器(例如 Chrome)正常打开。然而,任何试图在 Java Android 应用程序中将其加载到 ImageView 的尝试都失败了。我尝试过 Volley、Picasso、Glide、Retrofit 和手动方法。我包括一些我尝试过的代码。我最接近它会产生此错误消息D/skia: --- Failed to create image decoder with message 'unimplemented'
。问题是内容类型是image/png
,但我无法在任何地方指定它,并且由于 URL 不包含任何扩展名,因此解码起来相当有问题。如果您通过 API 客户端(例如 Postman)运行 GET 请求,它将返回一个 PNG 文件。
此 URL 也存在同样的问题https://speakyfox-api-qa.herokuapp.com/api/v1/files/7b6f4529-256f-43a4-ac45-8613d96c505e
。它包含一个我希望放入 MediaPlayer 对象的简短 MP3 文件。
在大喊它是单线之前,我很感激您尝试让图像显示在 ImageView 中。问题是该链接是针对 html 而不是直接针对数据。
// Getting reference to ImageView object
ImageView imageView = (ImageView)findViewById(R.id.imageView);
// Loading using Picasso
Picasso.get().load("https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3").into(imageView);
// Loading using Glide
Glide.with(MainActivity.this).load("https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3").into(imageView);
// Loading using HttpURLConnection/InputStream/Bitmap executed in Async task
java.net.URL url = new java.net.URL("https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
imageView.setImageBitmap(myBitmap);
// Using Volley [ImageRequest]
RequestQueue queue = Volley.newRequestQueue(this);
ImageRequest request = new ImageRequest("https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3", new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap response) {
imageView.setImageBitmap(response);
}
}, 0, 0, Bitmap.Config.RGB_565, null){
/** Passing some request headers* */
@Override
public Map getHeaders() {
HashMap headers = new HashMap();
headers.put("Content-type","image/png");
return headers;
}
queue.add(request);
// Using Volley [NetworkImageView]
NetworkImageView networkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
RequestQueue mRequestQueue = Volley.newRequestQueue(this);
ImageLoader mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(10);
public void putBitmap(String url, Bitmap bitmap) {
mCache.put(url, bitmap);
}
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
});
networkImageView.setImageUrl("https://speakyfox-api-qa.herokuapp.com/api/v1/files/be28dcec-4912-4f58-8cb8-12b9b2948fc3", mImageLoader);
// Using Volley [StringRequest]
RequestQueue queue = Volley.newRequestQueue(this);
StringRequest getRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
byte[] decodedString = Base64.decode(response, Base64.URL_SAFE);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
imageView.setImageBitmap(decodedByte);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {}
}) {
/** Passing some request headers* */
@Override
public Map getHeaders() {
HashMap headers = new HashMap();
headers.put("Content-type","image/png");
return headers;
}
};
queue.add(getRequest);
但是,此代码有效(但很难看)...
WebView webView = findViewById(R.id.webview);
webView.loadUrl("https://speakyfox-api-qa.herokuapp.com/api/v1/files/7b6f4529-256f-43a4-ac45-8613d96c505e");
不过,我需要让它与 ImageView 一起工作。
编辑:我尝试使用此代码使用 OkHttp 下载文件
Request request = new Request.Builder().url(url).addHeader("Content-Type", "image/png").build();
OkHttpClient client = new OkHttpClient();
Call call = client.newCall(request);
call.enqueue(new Callback() {
public void onResponse(Call call, Response response) throws IOException {
Log.e("",response.body().string());
}
public void onFailure(Call call, IOException e) {}
});
响应主体是
{"code":{"group":3,"internalCode":200,"statusCode":200},"data":{"type":"Image","imageType":"Whole","name": "我和你.png","size":67710,"contentType":"image/png","id":"db296f16-3283-4ba5-a32b-52b9feb64764","modified":"2019-10-16T20 :44:20.468276Z"}}