Android 使用OkHttp下载图像时将显示null

我尝试使用OkHttp从URL下载图像。它返回null

我有权限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

下面是我在主要活动中的getPicture方法

   public void getPicByURL() {

        try {
            RestClient.getInstance(getActivity()).uploadPicture(new Callback() {

                @Override
                public void onFailure(Request request, IOException e) {
                    e.printStackTrace();
                }

                @Override
                public void onResponse(Response response) throws IOException {

                    final String json = response.body().string();
                    if (response.code() == Constants.SUCCESSFUL_DOWNLOAD) {
                        ResponseBody in = response.body();
                        InputStream inputStream = in.byteStream();
                        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
                                                updateImage(BitmapFactory.decodeStream(bufferedInputStream));
                    } 
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private void updateImage(final Bitmap bitmap) {

        new Handler(Looper.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                if (bitmap != null) {
                    mSelectedPic.setImageBitmap(bitmap);
                } else {
                    Toast.makeText(getActivity(), R.string.show_error, Toast.LENGTH_SHORT).show();
                }
            }
        });
  }

updateImage（）

方法接受位图=null。我不知道我做错了什么。请帮助。

使用您当前的Url（

http://www.101apps.co.za/images/headers/101_logo_very_small.jpg

）和您的目的（仅将图像加载到ImageView中），我建议您使用或

使用毕加索时的示例代码：

        ImageView imageView = (ImageView) findViewById(R.id.imageView);
        Picasso.with(this)
                .load("http://www.101apps.co.za/images/headers/101_logo_very_small.jpg")
                .into(imageView);

希望有帮助

与您当前的Url（

http://www.101apps.co.za/images/headers/101_logo_very_small.jpg

）和您的目的（仅将图像加载到ImageView中），我建议您使用或

使用毕加索时的示例代码：

        ImageView imageView = (ImageView) findViewById(R.id.imageView);
        Picasso.with(this)
                .load("http://www.101apps.co.za/images/headers/101_logo_very_small.jpg")
                .into(imageView);

---

希望有帮助

嗨，这对我有用试试这个

  OkHttpClient client = new OkHttpClient();
  Request request = new Request.Builder().url("https://www.101apps.co.za/images/headers/101_logo_very_small.jpg").get().build();

            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    Log.i("Tag","error"+e.getMessage());
                }

               @Override
                public void onResponse(Call call, final Response response) throws IOException {

                   runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                   ImageView imageView (ImageView)findViewById(R.id.down_imageView);

                            ResponseBody in = response.body();
                            InputStream inputStream = in.byteStream();
                            Log.i("inputStream","inputstream value = "+inputStream);
                            // convert inputstram to bufferinoutstream
                            BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
                            Bitmap bitmap=BitmapFactory.decodeStream(bufferedInputStream);
                            Log.i("bitmap","bitmap value = "+bitmap);
                            imageView.setImageBitmap(bitmap);

                           }
                    });

               }
            });
        }
    });

---

嗨，这对我有用试试这个

  OkHttpClient client = new OkHttpClient();
  Request request = new Request.Builder().url("https://www.101apps.co.za/images/headers/101_logo_very_small.jpg").get().build();

            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    Log.i("Tag","error"+e.getMessage());
                }

               @Override
                public void onResponse(Call call, final Response response) throws IOException {

                   runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                   ImageView imageView (ImageView)findViewById(R.id.down_imageView);

                            ResponseBody in = response.body();
                            InputStream inputStream = in.byteStream();
                            Log.i("inputStream","inputstream value = "+inputStream);
                            // convert inputstram to bufferinoutstream
                            BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
                            Bitmap bitmap=BitmapFactory.decodeStream(bufferedInputStream);
                            Log.i("bitmap","bitmap value = "+bitmap);
                            imageView.setImageBitmap(bitmap);

                           }
                    });

               }
            });
        }
    });

---

你查过网址了吗？在borwser中打开你的url会给我404而不是found@Raghunandan-是的。另一个URL返回空值，该图像URL（

http://www.101apps.co.za/images/headers/101_logo_very_small.jpg

）为什么不使用或？是否检查了url？在borwser中打开你的url会给我404而不是found@Raghunandan-是的。另一个URL返回空值，该图像URL（

http://www.101apps.co.za/images/headers/101_logo_very_small.jpg

）为什么不使用或？