Today we are going to discuss the next Andong Broadcastreceiver component and the two ways to register it in a detailed analysis.
Broadcastreceiver is the "broadcast receiver" meaning, as the name suggests, it is used to receive from the system and applications in the broadcast. In the Android system, broadcast in all aspects, for example, when the system is completed after a broadcast, received this broadcast will be able to achieve the function of
know about the broadcast recipientsThe broadcast recipient (Broadcastreceiver) is used to receive broadcast intent, and the broadcast intent is sent by calling Context.sendbroadcast (), Context.sendorderedbroadcast () To achieve. Typically a broadcast intent can be received by multiple broadcast receivers subscribed to this intent, which is similar to topic message recipients in JMS. The method to implement a broadcast receiver is as follows:The firs
How to quickly find the programs required by users in many digital TV programs, it is a problem to be solved in digital TV applications. In DVB generally, electronic program guides are used in receivers ( EPG ) this tool allows you to quickly find programs and generate EPG the data source is DVB business information in the code stream Si information.
on a digital TV, all the video, audio, text, images and other digital processing has become the data, and according to the MPEG-2 Sta
Original article: http://blog.csdn.net/weidi1989/article/details/8016688
BroadcastreceiverAs a broadcast receiver, because the transmission of messages between Android components is based on intent, what type of broadcast the broadcast receiver wants to receive, set the value of the action tag under the intent-filter tag under the Consumer er tag to the broadcast type, as shown in figure
The a
to 1 at the same time:
URG: The URG pointer is valid and can be used together with the URG pointer.
ACK: confirm that the serial number is valid
PSH: the receiver sends the packet segment to the application layer as soon as possible.
RST: rebuild the connection
SYN: the synchronization sequence number is used to initiate a connection.
FIN: the sender completes the sending task and will close the connection.
The calculation method of the test is the s
Contents of this issue:
Architecture Design of Receivertracker
Message circulatory system
Receivertracker Concrete Implementation
First, the architecture design of Receivertracker1, Receivertracker can be driver in the specific own algorithm to start receiver in the specific execute, the way to start receiver will each receiver is encapsulat
, theTCP header has a field called Window, also called Advertised-window, this field is the receiver tells the sender how many buffers can receive data . The sender can then send the data based on the processing power of the receiving end, without causing the receiver to process it. To illustrate the sliding window, we need to look at some of the data structures of the TCP buffers:, we can see:
The
Broadcast usage in Android 17th
Broadcast is a mechanism widely used to transmit information between applications. Broadcast in android is used to listen to system events or application events! Broadcast in android includes normal broadcast, ordered broadcast, and asynchronous broadcast (viscous broadcast )!
The broadcast has both resident and non-resident broadcasts. Resident broadcasts are registered in xml. When the application is closed, if the corresponding broadcast is sent, the broadcast
party to stick to a packet). In view of this situation, we have carried on the special research and the experiment. In this paper, the problem of TCP network sticky packet is analyzed emphatically, and the countermeasures and methods for solving this problem are put forward, which are used for reference by engineering technicians.I. Introduction to the TCP protocolTCP is a connection-oriented transport layer protocol, although TCP does not belong to the ISO set of protocols, but because of its
In the first two chapters we introduce functions and struct, do you ever think of a function as a struct field? Today we'll explain another form of function, with a function of the receiver, which we call method
Method
Now suppose there is a scene where you define a struct called a rectangle, and you want to compute his area now, then we should do it in the following way
Copy Code code as follows:
Package Main
Import "FMT"
T
executed, and how it was executed.4. The command mode makes the request itself an object that can be stored and delivered as well as other objects.5. The key to command mode is the introduction of the abstract command interface, and the sender for the abstract Command interface programming, only the implementation of the abstract command interface to the specific command to be associated with the receiver.
Related Roles
The command mode involves fiv
SeeAndroidBroadcast is divided into two different types:Normal broadcast Normal broadcasts) "and" Ordered broadcast Ordered broadcasts)". Normal broadcast is completely asynchronous and can be received by all receivers at the same time logically. The message transmission efficiency is relatively high, but the disadvantage is: the receiver cannot pass the processing result to the next receiver, and cannot te
internal data classes (ReceiverRecord and BroadcastRecord) and three data sets of the LocalBroadcastManager class.
Private static final class ReceiverRecord {// record the current intent to filter the final IntentFilter filter; // record the current broadcast receiver final BroadcastReceiver receiver; // whether the current broadcast receiver is broadcasting boo
characteristics of the network, and is responsible for transmitting 0 and 1 electrical signals.
3. Link Layer
3.1 Definition
0 and 1 alone have no meaning. You must specify the interpretation method: How many electric signals are counted in a group? What is the significance of each signal bit?
This is the function of "link layer". It is above the "entity layer" and determines the grouping method of 0 and 1.
3.2 Ethernet protocol
In the early days, each company had its own electric signal groupi
, theTCP header has a field called Window, also called Advertised-window, this field is the receiver tells the sender how many buffers can receive data . The sender can then send the data based on the processing power of the receiving end, without causing the receiver to process it. To illustrate the sliding window, we need to look at some of the data structures of the TCP buffers:, we can see:
The
definition: encapsulates a request as an object, allowing you to parameterize the client with different requests, queue requests, or log request logs, which can provide undo and redo functions for the command.Type: behavior class modeClass Diagram:Structure of the command patternAs the name implies, the command pattern is the encapsulation of the command, first of all look at the basic structure of the command pattern class diagram:
Command class: is an abstract class that declares comm
, theTCP header has a field called Window, also called Advertised-window, this field is the receiver tells the sender how many buffers can receive data . The sender can then send the data based on the processing power of the receiving end, without causing the receiver to process it. To illustrate the sliding window, we need to look at some of the data structures of the TCP buffers:, we can see:
The
4th section Broadcast usage rightsThere are two issues to consider when setting permissions for a broadcast.
As the sender of the broadcast, want to restrict the receiver of the broadcast, only the specific application components to receive the broadcast sent;
As the receiver of the broadcast, you do not want any component to imitate the broadcast it cares about, so it is hoped that the sender
grouping method. Gradually, a protocol called "Ethernet" occupies a dominant position.
According to Ethernet rules, a group of electrical signals constitute a packet called frame ). Each frame is divided into two parts: header and data ).
"Header" contains some descriptions of the data packet, such as the sender, receiver, and data type. "data" is the specific content of the data packet.
The length of the "Header", which is fixed to 18 bytes
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