Get all files in raw folder in android

Question

lets say i have 100 .mp3 files in raw folder

for a single known file can read files can use getResources().openRawResource(R.raw.myfilename)

but i want to get all the files names in raw folder and then pick a random one from that list

any help?

Answer 1

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

Since the actual files aren't just sitting on the filesystem once they're on the phone, the name is irrelevant, and you'll need to refer to them by the integer assigned to that resource name. In the above example, you could get this integer thus:

int resourceID=fields[count].getInt(fields[count]);

This is the same int which you'd get by referring to R.raw.whateveryounamedtheresource

refer

Answer 2

Just for completeness, here is the same thing in Kotlin:

package com.kana_tutor.KanaCard

import android.util.Log
import java.lang.reflect.Field

fun listRaw() {
    val fields: Array<Field> =
        com.kana_tutor.KanaCard.R.raw::class.java.getFields()
    fields.forEach {field ->
        Log.d("Knames", String.format(
                "name=\"%s\", id=0x%08x",
                field.name, field.getInt(field))
        )
    }
}

Answer 3

To add to what @EminemT said, R.raw.class.getFields() seemed to give internal files used by android. To get the files you put in res/raw, use R.raw.class.getDeclaredFields() instead.