geopackage-sdk/src/main/java/mil/nga/geopackage/tiles/features/FeatureTileCanvas.java
public void recycle() {
        for (int layer = 0; layer < 4; layer++) {
            Bitmap bitmap = layeredBitmap[layer];
            if (bitmap != null) {
                bitmap.recycle();
                layeredBitmap[layer] = null;
                layeredCanvas[layer] = null;
            }
        }
    }
public void recycle() {
        for (int layer = 0; layer < 4; layer++) {
            Bitmap bitmap = layeredBitmap[layer];
            if (bitmap != null) {
                bitmap.recycle();
                layeredBitmap[layer] = null;
                layeredCanvas[layer] = null;
            }
        }
    }
Recycle the layered bitmaps