how to select from resources randomly (R.drawable.xxxx)

Question

I want to display a random image from the bunch of images i have stored in res/drawable.

The only technique that I know is to access a particular image if you know its r

Answer 1

I did this in my Applez application as follows;

1) create an ArrayList to hold images and fill it 2) take random number and return corresponding image.

in code :

public static void fruitInventory() {
fruitResources.clear();
Field[] fields = R.drawable.class.getFields();

for (Field field : fields) {
    // Take only those with name starting with "fr"
    if (field.getName().startsWith("fr_")) {
        try {
            String FType = field.getName().substring(3);

            fruitResources.add(field.getInt(null));
            alfruitTypes.add(FType);
            Log.d("FruitManager", "Type " + FType);

        } catch (IllegalArgumentException e) {

            e.printStackTrace();
        } catch (IllegalAccessException e) {

            e.printStackTrace();
        }
    }


}

and to add the fruit :

public static void addFruit(Context context){

fruitInventory();

for (int i = 0; i < 10; i++) {
Random Rnd = new Random();
int FruitType = Rnd.nextInt(fruitResources.size());
GameObject nextApple = new GameObject(BitmapFactory.decodeResource(context.getResources(),
                  fruitResources.get(FruitType)), FruitType);

MainGamePanel.AppleList.add(nextApple);
}

}

Idea was (and works) that I could add extra fruits to the game, simply by adding for instance "fr_eggplant.bmp" to the images folder.