class CellDrawableProvider {
    private final Map<Object, Drawable> drawables;
    private final Resources resources;

    CellDrawableProvider(Resources resources) {
        this.resources = resources;
        this.drawables = new HashMap<Object, Drawable>();
    }

    Drawable getCellDrawable(int moveIconId, int fireIconId) {
        if (fireIconId == android.R.color.transparent) {
            return getDrawable(moveIconId);
        } else {
            return getLayerDrawable(moveIconId, fireIconId);
        }
    }

    private Drawable getLayerDrawable(int moveIconId, int fireIconId) {
        Object layerDrawableKey = Pair.create(moveIconId, fireIconId);
        Drawable layerDrawable = drawables.get(layerDrawableKey);
        if (layerDrawable == null) {
            layerDrawable = createLayerDrawable(moveIconId, fireIconId);
            drawables.put(layerDrawableKey, layerDrawable);
        }
        return layerDrawable;
    }

    private Drawable createLayerDrawable(int moveIconId, int fireIconId) {
        Drawable[] layers = new Drawable[2];
        layers[0] = getDrawable(moveIconId);
        layers[1] = getDrawable(fireIconId);
        return new LayerDrawable(layers);
    }

    private Drawable getDrawable(int iconId) {
        Drawable drawable = drawables.get(iconId);
        if (drawable == null) {
            drawable = resources.getDrawable(iconId);
            drawables.put(iconId, drawable);
        }
        return drawable;
    }
}

Drawable dr = getCachedDrawable(isColorDrawable ? mColorDrawableCache : mDrawableCache, key);

    if (dr != null) {
        return dr;
    }

private Drawable getDrawable(int iconId) {
    Drawable drawable = drawables.get(iconId);
    if (drawable == null) {
        drawable = resources.getDrawable(iconId);
        drawables.put(iconId, drawable);
    }
    return drawable;
}