Question

在setOnClickListener中我将url传递给另一个类中的方法，从片段下载图像，但是在启动应用程序后，它不能正常工作（它显示Toast消息但图像没有下载）但是从第二次单击它是工作得很好。

这是我的代码：

downloadimg.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String[] urls = new String[50];
            for (int i = 0; i < images.size(); i++) {
                urls[i] = images.get(i).getLarge();

            }
            DownloadImages downloadImages= new DownloadImages();
            downloadImages.downloadImage(getActivity(),urls, images.get(0).getName());
            Toast.makeText(getActivity(), "Download Completed", Toast.LENGTH_SHORT).show();

            getActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
            Log.i("TAG", "scanning File jbdv");


        }
    });

这是完整的DownloadImages类

public class DownloadImages extends AppCompatActivity {

public  void downloadImage(final Context ctx, String[]imgloc, final String folder) {

    for (int i = 0; i < imgloc.length; i++) {

        Picasso.with(ctx)
                .load(imgloc[i])
                .into(new Target() {
                          @Override
                          public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
                              try {
                                  String root = Environment.getExternalStorageDirectory().toString();
                                  File myDir = new File(root + "/~" +folder);

                                  if (!myDir.exists()) {
                                      myDir.mkdirs();
                                  }

                                  String name = new Date().getTime() + ".jpg";
                                  myDir = new File(myDir, name);
                                  FileOutputStream out = new FileOutputStream(myDir);
                                  bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);

                                  out.flush();
                                  out.close();
                                  Log.i("TAG", "scanning File " +myDir.getAbsolutePath());
                              } catch (Exception e) {
                                  // some action
                              }

                          }


                          @Override
                          public void onBitmapFailed(Drawable errorDrawable) {
                          }

                          @Override
                          public void onPrepareLoad(Drawable placeHolderDrawable) {
                          }
                      }
                );


    }

}

}

Answer 1

将代码放在onStart（）方法

中

并且为了快速访问图像，请在后台进行

启动应用后，Android setOnClickListener无法首次点击

1 个答案: