Question

我想向我的应用程序添加图库片段或活动，以便可以显示下载的文件，例如图像和视频。

我目前正在出于以下目的使用此代码：

图库类：

class GalleryClass extends AsyncTask < Void, Void, Void > {
    public static ArrayList < String > f = new ArrayList < > ();

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        Gallery.gridView.setAdapter(new ImageAdapter(Gallery.context));
    }

    @Override
    protected Void doInBackground(Void...voids) {
        File dir = new File(String.valueOf(Environment.getExternalStoragePublicDirectory("myFolder")));
        File[] FileList = dir.listFiles();
        if (FileList != null) {
            for (File aFileList: FileList) {
                f.add(aFileList.getAbsolutePath());
            }
        }
        return null;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        f.clear();
    }

    public class ImageAdapter extends BaseAdapter {
        private Context mContext;

        ImageAdapter(Context context1) {
            mContext = context1;
        }

        @Override
        public int getCount() {
            return f.size();
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            final ImageView imageView;
            if (convertView == null) {
                imageView = new ImageView(mContext);
                imageView.setLayoutParams(new ViewGroup.LayoutParams(230, 230));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(0, 0, 0, 0);
            } else {
                imageView = (ImageView) convertView;
            }
            Glide.with(Gallery.context).load("file://" + f.get(position))
                .apply(new RequestOptions()
                    .placeholder(R.drawable.)
                    .error(R.drawable.ic_error)
                )
                .into(imageView);
            return imageView;
        }
    }
}

图库片段：

    public Gallery() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        view = inflater.inflate(R.layout.fragment_gallery, container, false);
        gridView = view.findViewById(R.id.gv);
        context = getActivity();
        GalleryClass process = new GalleryClass();
        process.execute();
        return view;
    }
}

上面的代码工作正常，并且正在从“ MyFolder”加载图像，但是MyFolder也包含子文件夹，并且它显示errorplaceholder而不是包含图像的子文件夹，我也想在同一视图中显示该子文件夹，并且当我单击该子文件夹时，它将显示该文件夹包含的图像。

我如何实现相同目标？

Answer 1

这将列出包含png，jpg，mp4文件的所有文件夹和子文件夹。

    String root_sd = Environment.getExternalStoragePublicDirectory("myFolder").toString();
    File file = new File(root_sd);
    File list[] = file.listFiles();

    for (int i = 0; i < list.length; i++) {
        File  mFile = new File(file, list[i].getName());
        File dirList[] = mFile.listFiles();
        if(dirList == null) continue;
        for (int j = 0; j < dirList.length; j++) {
            if(dirList[j].getName().toLowerCase(Locale.getDefault()).endsWith(".png")||dirList[j].getName().toLowerCase(Locale.getDefault()).endsWith(".jpg")||dirList[j].getName().toLowerCase(Locale.getDefault()).endsWith(".mp4")){
                f.add(list[i].getName());
                break;
            }
        }

    }

Answer 2

使用此：

File f = new File(path);
File[] files = f.listFiles();
for (File inFile : files) {
    if (inFile.isDirectory()) {
        // is directory
    }
}

也使用subFolders为应用程序创建图库吗？

2 个答案: