图像根本没有出现

Question

图像根本没有出现，总是有一个异常被try catch捕获，而图像却从未出现过

URL url = null;
try {
    url = new URL(currentBook.getImageLink());
    Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
    bookImageView.setImageBitmap(bmp);
} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 1

我在维护文件中使用了这一行代码

  

android：usesCleartextTraffic =“ true”

这是我的使用后台线程的代码解决方案

  

私有类imageAsyncTask扩展了AsyncTask {    @Override        受保护的位图doInBackground（String ... url）{           if（url.length <1 || url [0] == null）{               返回null;           }

    URL realyUrl = null;
    try {

            realyUrl = new URL(url[0]);
            bmp = BitmapFactory.decodeStream(realyUrl.openConnection().getInputStream());


    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }


    return bmp;
}

@Override
protected void onPostExecute(Bitmap bitmap) {

    if (bitmap != null){

        bookImageView.setImageBitmap(bitmap);
    }
} }