在Android中使用RxJava,OkHttp和Okio下载进度

在我们的应用程序中,我使用此代码下载一个图像文件我需要在UI上显示下载进度(以百分比形式下载的字节数).如何在这段代码中获得下载进度？我搜索解决方案,但仍然无法自行设法完成.

Observable<String> downloadObservable = Observable.create(
                    sub -> {
                        Request request = new Request.Builder()
                                .url(media.getMediaUrl())
                                .build();
                        Response response = null;
                        try {
                            response = http_client.newCall(request).execute();
                            if (response.isSuccessful()) {
                                Log.d(TAG,"response.isSuccessful()");
                                String mimeType = MimeTypeMap.getFileExtensionFromUrl(media.getMediaUrl());
                                File file = new File(helper.getTmpFolder() + "/" + helper.generateUniqueName() + "test." + mimeType);
                                BufferedSink sink = Okio.buffer(Okio.sink(file));
                                sink.writeAll(response.body().source());
                                sink.close();
                                sub.onNext(response.toString());
                                sub.onCompleted();
                            } else {
                                sub.onError(new IOException());
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
 
                    }
            );
 
            Subscriber<String> mySubscriber = new Subscriber<String>() {
                @Override
                public void onNext(String responseString) {
                    Log.d(TAG,"works: " + responseString);
                }
            };
            downloadObservable
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(mySubscriber);

解决方法

这是我会做的以显示进度.

Observable<String> downloadObservable = Observable.create(
  sub -> {
          InputStream input = null;
          OutputStream output = null;
          try {
          Response response = http_client.newCall(request).execute();
           if (response.isSuccessful()) {                 
             input = response.body().byteStream();
             long tlength= response.body().contentLength();
 
             output = new FileOutputStream("/pathtofile");
             byte data[] = new byte[1024];
 
             sub.onNext("0%");
             long total = 0;
             int count;
             while ((count = input.read(data)) != -1) {
               total += count;
 
               sub.onNext(String.valueOf(total*100/tlength) + "%");
 
               output.write(data,count);
             }
             output.flush();
             output.close();
             input.close();
           }
          } catch(IOException e){
            sub.onError(e);
          } finally {
                if (input != null){
                    try {
                        input.close();
                    }catch(IOException ioe){}
                }
                if (out != null){
                    try{
                        output.close();
                    }catch (IOException e){}                        
                }
          }
        sub.onCompleted();
   }
);

并使用具有完整抽象方法的订阅者.

Subscriber<String> mySubscriber = new Subscriber<String>() {
 
@Override
public void onCompleted() {
  // hide progress bar
}
 
@Override
public void onError(Throwable e) {
  // hide progress bar
}
 
@Override
public void onNext(String percentProgress) {
  // show percentage progress
}
};

在Android中使用RxJava,OkHttp和Okio下载进度

解决方法

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