How to get all media files in /res/raw dynamically?

Question

I want to initialize MediaPlayer instances for all of the soundfiles found in res/raw:

/res/raw/test1.mp3
/res/raw/test2.mp3
/res/raw/testN.mp3

Purpose is to play different samples on a button click, without delays.

List<MediaPlayer> player = new ArrayList<>();

//TODO how to loop properly?
for (Rawfile file : rawfiles) {
    pl = MediaPlayer.create(getBaseContext(), R.raw.test1);
    player.add(pl);
}

Lateron, if eg button2 is clicked:

player.get(1).start();

Question: how can I get the R.raw.* files dynamically during initialization of the app?

Update: the following is quite close, but there are 2 problems:

1) If eg only one file "test.mp3" is placed in my /res/raw folder, the function shows 3 files. 2) How can I then load those files to mediaplayer?

public void listRaw(){
    Field[] fields=R.raw.class.getFields();
    for(int count=0; count < fields.length; count++){
        Log.i("Raw Asset: ", fields[count].getName());
    }
}

Result:

I/Raw Asset:: $change
I/Raw Asset:: serialVersionUID
I/Raw Asset:: test

check [android-how-do-can-i-get-a-list-of-all-files-in-a-folder](https://stackoverflow.com/questions/6539715/android-how-do-can-i-get-a-list-of-all-files-in-a-folder) — ELITE, Jul 31 '17 at 10:56
@ELITE this gives 3 files, as updated above. But I only have one... — membersound, Jul 31 '17 at 11:03

score 3 · Answer 1 · answered Jul 31 '17 at 11:18

For the moment solved as follows, but feels kinda hacky:

public static List<Integer> listRawMediaFiles() {
    List<Integer> ids = new ArrayList<>();
    for (Field field : R.raw.class.getFields()) {
        try {
            ids.add(field.getInt(field));
        } catch (Exception e) {
            //compiled app contains files like '$change' or 'serialVersionUID'
            //which are no real media files
        }
    }
    return ids;
}

score 0 · Answer 2 · answered Jul 31 '17 at 10:52

I Really forget from where i get this, it can be duplicated any way not my code but works perfectly :

 private boolean listFiles(String path) {
        String [] list;
        try {
            list = getAssets().list(path);
            if (list.length > 0) {
                // folder founded 
                for (String file : list) {
                    if (!listAssetFiles(path + "/" + file))
                        return false;
                }
            } else {
                //file founded
            }
        } catch (IOException e) {
            return false;
        }
        return true; 
    }

What is `listAssetFiles()`? I doubt this really returns the list of /raw files. At least `getAssets().list("/raw")` does not!. — membersound, Jul 31 '17 at 10:59

score 0 · Answer 3 · answered Jul 31 '17 at 11:23

Though undervoted, this answer from CommonsWare is comprehensive. The best you can do is iterate over the raw fields by reflection. If you find non-resource fields, you should discard them manually (I see you did it in an answer).

One point: putting files in raw directory is done during development time, and programming the iteration over raw resources is also done during development time. It's a problem you should solve before compilation, rather than finding out what files you have in run time, that is, you should list the files by name in your code.

How to get all media files in /res/raw dynamically?

3 Answers3

Related