我按照Retrofit页面上的说明下载图像，但是，如果没有@Streaming标记，inputstream.read(buffer)将立即等于-1，使文件呈现为空。 (图片很小，只有几百kb) 即使我使用@Streaming标签，当我使用输入流时，由于IllegalStateException，应用程序也会不断崩溃
我尝试了 HttpConnection，并且可以很好地下载图像。但是，我真的想让它与 Retrofit 一起使用
public static String downloadImage(String bearer, long pictureId,Context context){
String path = "";
NetworkAPI apiService = NetworkClient.getClient().create(NetworkAPI.class);
//Call<ResponseBody> downloadCall = apiService.downloadImage(bearer,pictureId);
Call<ResponseBody> downloadCall = apiService.downloadFileWithDynamicUrlSync("https://androidtutorialpoint.com/api/RetrofitAndroidImageResponse");
try {
Response<ResponseBody> response = downloadCall.execute();
if(response.isSuccessful()) {
Log.d(TAG, "success download" + response.body().string());
Log.d("DownloadImage", "Reading and writing file");
InputStream in = null;
OutputStream out = null;
try {
in = response.body().byteStream();
File file = PictureUtil.createImageFile(context);
Uri photoURI = FileProvider.getUriForFile(context,
"vn.com.wk.bradleyaudit.fileprovider",
file);
out = new FileOutputStream(file);
long fileSize = response.body().contentLength();
long downloadedSize = 0;
Log.d("DownloadImage", "size"+fileSize);
byte[] buffer = new byte[4096];
while (true) {
int bufferLength = in.read(buffer);
Log.d("DownloadImage", "buffer Length"+bufferLength);
if (bufferLength == -1) {
break;
}
out.write(bufferLength);
out.write(buffer, 0, bufferLength);
downloadedSize += bufferLength;
}
out.flush();
path = photoURI.toString();
Log.d("DownloadImage", "path"+path);
}
catch (IOException e) {
Log.d("DownloadImage",e.toString());
}
finally {
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
return path;
}
最佳答案
试试这个，
Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);
同时添加依赖；
compile 'com.squareup.picasso:picasso:2.5.2'
关于java - 使用 Retrofit 下载图像返回空文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41460254/