Method getBitmap

app/src/leanback/java/com/fongmi/android/tv/utils/QRCode.java:21–32

(String content, int size, int margin)

    private static final float MODULE_RADIUS_RATIO = 0.45f;

    public static Bitmap getBitmap(String content, int size, int margin) {
        try {
            int foreground = Color.WHITE;
            int finderBackground = Color.BLACK;
            BitMatrix matrix = encode(content, size, margin);
            int quietZone = detectQuietZone(matrix);
            int finderSize = detectFinderPx(matrix, quietZone);
            return render(matrix, foreground, finderBackground, quietZone, finderSize);
        } catch (Exception e) {
            return null;
        }
    }

    private static BitMatrix encode(String content, int size, int margin) throws Exception {
        Map<EncodeHintType, Object> hints = new EnumMap<>(EncodeHintType.class);