CODEWITHSUNDEEP
android
membersound
membersound

Reputation: 86925

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

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

Upvotes: 3

Views: 1727

Answers (3)

nandsito
nandsito

Reputation: 3852

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.

Upvotes: 0

membersound
membersound

Reputation: 86925

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;
}

Upvotes: 3

Oussema Aroua
Oussema Aroua

Reputation: 5339

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; 
    }

Upvotes: 0

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