如何在Android中以编程方式搜索和下载图像？

Question

我想在网站上搜索图像，例如-'pixabay，并下载搜索结果中的第一张图像。

我可以使用“自然”或“天空”之类的关键字轻松搜索图像。但是我找不到下载搜索结果中第一张图片的方法。

有什么办法吗？

Answer 1

您需要做的就是获取您要下载的图像的URL，然后可以像下面这样将其加载到android中：

/**
 * Gets the async task for image loading
 *
 * @param url - the url to load the image from
 * @return the executor that will pull the image from the URL
 */
private static AsyncTask<String, String, Bitmap> getImageLoader(final String url) {
    return new AsyncTask<String, String, Bitmap>() {
        @Override
        protected Bitmap doInBackground(String... strings) {
            try {
                final URL imageLocation = new URL(url);
                final BitmapFactory.Options options = new BitmapFactory.Options();
                //uncomment if you want the image to be mutable 
                //options.inMutable = true;
                return BitmapFactory.decodeStream(imageLocation.openConnection().getInputStream(), null, options);
            } catch (final IOException e) {
                e.printStackTrace();
            }
            return null;
        }
    };
}

Answer 2

您可以通过这种方式完成

  Uri Download_Uri = Uri.parse(url);
                    DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
                    request.setTitle("title");
                    request.setDescription(description);
                    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
                    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "/newfolder/" +"title" + ".png");
                    refId = downloadManager.enqueue(request);