How to download image file by using okhttpclient in Java

Question

I would like ask how to download image file by using okhttpclient in Java since I need to download the file with session.
here is the code given officially, but I don't know how to use it for downloading as image file.

private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("http://publicobject.com/helloworld.txt")
        .build();

    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

    Headers responseHeaders = response.headers();
    for (int i = 0; i < responseHeaders.size(); i++) {
      System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
    }

    System.out.println(response.body().string());
  }

Solution 1

Try something like this

InputStream inputStream = response.body().byteStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

Solution 2

Maybe it is a bit late to answer the question, but it may helps someone in the future. I prefer always to download photos in background, to do so using OkHttpClient, you should use callback:

    final Request request = new Request.Builder().url(url).build();
    okHttpClient.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    //Handle the error
                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    if (response.isSuccessful()){
                        final Bitmap bitmap = BitmapFactory.decodeStream(response.body().byteStream());
                       // Remember to set the bitmap in the main thread.
                        new Handler(Looper.getMainLooper()).post(new Runnable() {
                                @Override
                                public void run() {
                                    imageView.setImageBitmap(image);
                                }
                            });
                    }else {
                        //Handle the error
                    }
                }
            });

Comments

[dazza5000]

I made a simple sample Android project that shows how to use okhttp to download an image and display the image in an imageview. github.com/dazza5000/OkHttpDownloadImage

[Nakamoto]

See the sample directly here: github.com/dazza5000/OkHttpDownloadImage/blob/master/app/src‌​/…

[parsecer]

Then what? What type would be method return? How to convert Bitmap to Image?