Create list with files in different folders on android

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Can anyone give me an idea of how to put together a list, as items that are within separate pasture? Example:

pasta1: archivos1 and archivos2 pasta2: archivos3 and archivos4

the list would be: archivist 1 archivist 2 archivist 3 archivists 4

The list I have is as follows:

    File home = new File(MEDIA_PATH);
    if (home.listFiles(new FileExtensionFilter()).length > 0) {
        for (File file : home.listFiles(new FileExtensionFilter())) {
            HashMap<String, String> song = new HashMap<String, String>();

            song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
            song.put("songPath", file.getPath());

            // Adding each song to SongList
            songsList.add(song);
        }
    }
    // return songs list array
    return songsList;
}

but this list only reads from a folder, emphasizing that I need the Song.put function, which I use...

android

  • Can you list the folders of a given directory? If you know, just list and add everything in the same list.

  • yes I have the list of the sdcard/folder directory, what I need is for me to be able to add in a single list, files inside sdcard/folder/paste1,sdcard/folder/paste2,sdcard/folder/paste3, and so on...

1 answer

1

As it is filtering by extension you lose the directories in the listing. For this, I recommend to list everything and use an instance of Filter to filter "manually" the files you want, thus keeping the directories during iteration.

With this adaptation the code is:

public List<Map<String, String>> listarArquivos(File diretorio) {

    FileExtensionFilter filter = new FileExtensionFilter();
    File[] arquivos = diretorio.listFiles();
    List<Map<String, String>> songsList = new ArrayList<Map<String, String>>();

    if (arquivos.length > 0) {
        for (File file : arquivos) {

            // Se o arquivo que esta iterando for um diretorio
            // É preciso chamar recursivamente essa função para
            // continuar recuperando os arquivos
            if(file.isDirectory()) {
                songsList.addAll(listarArquivos(file));
            } else if(filter.accept(file)) {
                HashMap<String, String> song = new HashMap<String, String>();

                song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
                song.put("songPath", file.getPath());

                // Adding each song to SongList
                songsList.add(song);
            }
        }
    }

    // return songs list array
    return songsList;
}

To call:

List<Map<String, String>> arquivos = listarArquivos(new File(MEDIA_PATH));

The call to the method accept will vary depending on which interface the Filter is using:

  1. If it is a FileFilter, just use filter.accept(file);
  2. If it is a FilenameFilter just use filter.accept(diretorio, file)).

An off-topic recommendation: Create a POJO to store data from songTitle and songPath. Use a HashMap to store two attributes is much more expensive than creating an object with two attributes.

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