JAVA 数组分割（蓝牙超过20个字节）

JSonObject cmdJson = new JSONObject();
        cmdJson.put("cmd", "BLOOD_OXYGEN");
        cmdJson.put("num", mRandom.nextInt(100));
        byte[] bytes = cmdJson.toJSONString().getBytes();
        int sendLen = 0;
        while (sendLen < bytes.length) {
            int dataLen = 20;
            if (dataLen + sendLen > bytes.length) {
                dataLen = bytes.length - sendLen;
            }
            byte[] data = new byte[dataLen];
            for (int i = sendLen; i < sendLen + dataLen; i++) {
                data[i - sendLen] = bytes[i];
            }
            sendLen += dataLen;
            LogUtil.e(Arrays.toString(data));
        }