The birth of VDSL is not as elegant as ADSL, but more and more people are paying attention to it. Recently, TP-Link, known for pushing low-end network products, also launched a VDSL switch TD-VF1008. Tu qianliang, Project Manager of the TP-Link product department, stressed: "The biggest benefit of VDSL is that it breaks through the distance constraints of Traditi
Broadband Access Network is a mainstream access technology, and there are also many access methods. Here we mainly introduce the overview of VDSL and its working principles, including the characteristics of VDSL. Digital user line DSL is a constantly evolving broadband access network technology that uses advanced digital encoding and modulation and demodulation technologies to transmit broadband signals ove
VDSL technology has become a new favorite of line access technology. When you search for the keyword of VDSL technology, it is to understand VDSL technology and become a problem of line access technology. Therefore, this article should be able to meet the needs of most netizens.
1. Overview of VDSL technology
In short,
VDSL access network technology is still quite common. So I have studied the comprehensive comparison between VDSL access network technology and ADSL technology. Here I will share with you, hoping to be useful to you. XDSL Broadband Access Technology Based on copper cables has been widely used in the market. As the mainstream technology of ADSL and VDSL access net
Studies have shown that the development of ADSL and VDSL technology will go through the following development processes in the direction of complementary advantages:
ADSL Based on ATM technology first appeared and matured after large-scale application. In fact, ADSL was born in Bell Laboratory as early as 1989. At that time, ADSL was intended to serve as a solution for ATM to users. Therefore, the ADSL Link Layer adopted the Encapsulation Format of AT
I. Overview
In short, VDSL is a fast version of ADSL. With VDSL, the maximum downloading rate within a short distance can reach 55 Mbps, And the upload speed can reach 2.3 Mbps (19.2 Mbps or higher in the future ). Both the upload and download data channels can be frequently divided on existing POTS or ISDN services, making VDSL a good choice for high-speed and l
If you use VDSL to access the Internet through ADSL or other methods, have you used VDSL to access the Internet? Will there be other ways to access the Internet? Is your VDSL surfing the Internet frequently causing you to get offline? Check the following articles to solve all the problems.
The Internet seems to be the only "network" that allows everyone to invest
corresponding provider.
Roles that are allowed to access the providers' permissions will be described in more detail in the content providers' permissions section.
The user dictionary provider defines the Android. Permission. read_user_dictionary license in its list file. Therefore, if the application wants to read data from this provider, it must apply for this permission.
Build Query
The next step is to
A provider can specify some permissions. Other applications must apply for permissions to access the data of the provider. These permissions ensure that the user understands what data the application will attempt to access. Based on the requirements of the provider, other applications need to apply for the required permissions to access the provider. When the application is installed, you can see the school-wide nature of the application.
If the provider application does not specify any permiss
Contract class)
The contract class defines some features that use content resource identifiers (URIs), column names, intent actions, and content providers to help applicationsProgramA constant of work. Contract classes are not automatically included with providers. providers must define them and make them valid for other developers. The Android platform contains
Introduction to service providers and facade models in Laravel, laravel providers
Preface
In laravel, we may need to create a folder to store class files, or use the laravel service provider.
In fact, the two are slightly different. The main difference is that the former will depend on the Business Code. Imagine if a controller references many custom class files, we can imagine how many dependencies will be
, you do not need a provisioner.
2. Read the topic "content providers' basics" carefully to learn more about providers' knowledge.
Next, follow these steps to create the provisioner:
1. Design row-based storage for data. The content provider provides data in two ways:
File data:
Usually, the data put into the file includes photos, audio, or video. These files are stored in the private space of your
(URI) mode is for a single row of data, use: Android. crusor. Item/
If the resource identification (URI) mode is for multi-row data, use: Android. cursor. DIR/
3. Specify the providers' part: VND.
You must provide
For example, if a provider has the permission of COM. example. App. provider and the table to be exposed is named Table1, the MIME type of multiple rows in Table1 is:
Vnd. Android. cursor. DIR/vnd.com. example. provider. Table1
The MIME t
Trainer small project (5) security guard _ using content providers for text message backup correction version, trainer providers
The text message backup class is basically finished in the last section. Iterative code development is required. Code reconstruction and decoupling are required after the development.
Knowledge points that can be learned
① Application of interfaces
② A simple ui thread uses runOn
Like the activity and service components, the contentprovider subclass must be defined using the
1. Authorization (Android: Authorities)
The identifier of the entire provider in the system.
2. Provides the class name (Android: name)
This class implements the contentprovider abstract class.
3. Permission
Attribute that specifies the permissions required for other applications to access the data of the provider:
A. Android. granturipermssions: Temporary Permission ID;
B. Android. Permission: Read
Content providers is one of the four major Android components and plays a very important role. Read the official documentation to explain it:
Content providers manage access to a structured set of data. They encapsulate the data, and provide mechanisms for defining data security. content providers are the standard interface thatConnects data in one process with
Android provides five data storage methods:
(1) files: Use fileinputstream and fileoutputstream to operate files. For details about how to use it, refer to the blog "android study note 34: Using files to store data".
(2) shared preferences: used to store data in the form of key-value pairs and save system configuration information. For details about how to use it, see the blog "android study note 35: using shared preferences to store data".
(3) content
The development of specialized CDN services in China has been in existence for 16 years. With the development of the Internet in China, CDN service becomes more and more important as a courier of Internet content. In addition to the CDN technology revolution, the CDN market landscape has also undergone a huge change. From the initial professional CDN service providers to the current telecom operators and Internet companies, they have all begun to ente
Content Providers is one of the four major Android components and plays a very important role. Read the official documentation to explain it:
Content providers manage access to a structured set of data. they encapsulate the data, and provide mechanisms for defining data security. content providers are the standard interface that connects data in one process with
it should be clear that no one can guarantee the ranking of keywords, even if the search engine optimization engineers to help you can not guarantee the optimization, If your service provider says to you that you must be able to line up, second or third, that is lying, if you encounter such a service provider, then you had better stay away from him, perhaps you will feel that there is such a guarantee, you can be assured to him, but to know if he promised is a meaningless word, such as company
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.