Getting List of Files/Folders

Let's find out how to get a list of folders and files by a specified path. The path doesn't need to be full; for example, instead of passing /storage/emulated/0/DCIM/Camera, you only pass /DCIM/Camera, and this applies EVERYWHERE.

This method will be return a JSONArray, but I changed it to MutableList:

Java


private static List<DirectoryContents> getListOfObjects(Activity ac) {
    MainActivity act = (MainActivity) ac;
    ContentResolver contentResolver = ac.getContentResolver();
    Uri uri = Uri.parse("content://com.anready.croissant.files")
           .buildUpon()
           .appendQueryParameter("path", act.getPath())
           .appendQueryParameter("command", "list")
           .build();

    Cursor cursor = null;
    try {
        cursor = contentResolver.query(uri, null, null, null, null);
        if (cursor != null && cursor.moveToFirst()) {
            int dataIndex = cursor.getColumnIndex("response");
            if (dataIndex == -1) {
                alertDialog(ac, "Data column not found");
                return new ArrayList<>();
            }

            JSONArray jsonArray = new JSONArray(cursor.getString(dataIndex));
            if (error(jsonArray)) {
                System.out.println("Error: " + jsonArray.getJSONObject(0).getString("error"));
                return new ArrayList<>();
            }

            List<DirectoryContents> fullList = new ArrayList<>();
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject fileInfo = jsonArray.getJSONObject(i);
                    fullList.add(new DirectoryContents(
                    fileInfo.getString("name"),
                    fileInfo.getBoolean("type"),
                    fileInfo.getBoolean("visibility")
                ));
            }

            return fullList;
        } else {
            System.out.println("Error while getting data!");
        }
    } catch (Exception e) {
       System.out.println(ac, "Error while getting data!\n" + e.getMessage());
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }

    return new ArrayList<>();
}

private static boolean error(JSONArray jsonArray) {
    try {
        jsonArray.getJSONObject(0).getString("error");
        return true;
    } catch (JSONException e) {
        return false;
    }
}
//..... in another class with name DirectoryContents \\
public class DirectoryContents {
    public final String name;
    public final boolean isDirectory;
    public final boolean isHidden;

    public DirectoryContents(String s, boolean b, boolean b1) {
        this.name = s;
        this.isDirectory = b;
        this.isHidden = b1;
    }
}

By calling this method: getListOfObjects(this, "/"). It will return List of DirectoryContents, you can receive error code: 02 and 01 (See the article Errors). You can use this List as you wish

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