Android Network Programming record

Brief introduction

Read in-depth understanding of Android network programming feels good, today on the Android network programming to make a point record.

Content

Android Web-based technology and programming practices

Points	Defined	Describe
IP protocol	A data-oriented protocol for message exchange networks
TCP protocol	Transmission Control Protocol, transport-layer communication protocols.
UDP protocol	User Datagram Protocol, Transport layer protocol.
SMTP protocol	Simple Mail Transfer Protocol
Socket sockets	The intermediate software abstraction layer that the application layer communicates with the TCP/IP protocol family.	There are two kinds of types: TCP sockets and UDP sockets.
TCP sockets		In the guarantee reliability, using the time-out retransmission and the pass-through confirmation mechanism, in the flow control, adopts the sliding window protocol, in the congestion control, adopts the slow-start algorithm.
UDP sockets		Compress the network data traffic into the form of a packet.
FTP protocol	File Transfer Protocol, the application layer of the transport Protocol.	Can operate Apache's package directly
Telnet protocol	Standard protocol for Remote login services	Can operate Apache's package directly
Differences between C + + and Java sockets	The socket is the original socket development interface API in Winsock.	1, the interface is different, the Java itself does not have the socket communication bottom implementation, but calls the system's underlying Winsock API two encapsulation; C + + is closer to the system-level Winsock, enabling more underlying scaling and control. 2. Java can be developed to run on the Support Java Virtual machine.
UDP and TCP differences		1, TCP reliable, UDP unreliable 2, TCP supports the application protocol has: TELNET,FTP,SMTP,TCP can transmit the data of large number of users 3, UDP Support Application Protocol: NFS (Network File system), SNMP (Simple Network management System), DNS (primary domain Name System), TFTP universal File Transfer Protocol, etc., the user transmits less data. 4, TCP is Java.net.ServerSocket (for the server side) and Java.net.Socket (for the client); UDP is Java.net.DatagramSocket. 5. Stream mode and datagram mode: TCP guarantees data correctness, UDP may drop packets, TCP guarantees data order, UDP does not guarantee.

Android basic Web technology and programming practices

Points	Defined	Describe
HTTP protocol	Application layer Protocol of Distributed hypermedia Information System. /HTTP Host [":" Port] [path]	Characteristics: 1. Support C/S mode 2, simple and fast 3. Flexible 4. No connection 5. No status Two types of messages: Request messages, response messages.
HTTP programming	Supported Features: auto-turn, HTTPS protocol, Proxy Server, method (get, post, put, head, opption, connect)	Implementation: Data request, data upload, data deletion and other operations. Actionable classes: HttpClient and URLConnection.
Json	JavaScript Object notation, lightweight text data Interchange format.	Actionable classes: Jsonobject, Jsonarray, Jsonarray, Jsontokener, Jsonstringer.
Soap	Simple Object Access Protocol, Application layer protocol.	Included elements: Envelope, Header, Body, Fault.
Html	Hypertext Markup Language	The methods for parsing HTML documents are: 1. Regular expressions 2. String positioning 3. HTML Parser Parser 4. Jsoup Parser
How to encrypt?	Data transfer can add an encryption algorithm for encryption	Cryptographic algorithms are: custom Displacement (other), MD5 (irreversible), symmetric encryption (DES, AES), asymmetric encryption (RSA) The crypto package can be introduced.

Android Common Network Interface programming

Points	Defined	Describe
Xml	Extensible tagging Voice	Creating an XML file using XmlSerializer
Dom parsing	A way of parsing XML, characterized by storing all the contents of an XML file in memory in the form of a document tree, and then using the DOM API to traverse the XML tree and retrieve the required data.	The Required classes: Documentbuilderfactory, Document, Element, NodeList.
Sax parsing	A way of parsing XML, features: event-driven, edge-loaded edge parsing.	The Required classes: XMLReader, ContentHandler, Dtdhandler, ErrorHandler, Entityresolver
Pull parsing	Ditto
Rss	Simple information aggregation, a format for describing and synchronizing web site content. Subscribe: Blogs, news.
Email programming	As the name implies: Send mail.	1. Use the system's own mail service. 2, the use of JavaMail function package to send mail.
Add decryption	Encryption is the process of converting plaintext into ciphertext through cryptographic algorithms and cryptographic keys, and decryption is reversed.	1, Base64 encryption (character means binary data) 2, DES is the data Encryption Standard 3, AES is the Advanced Encryption Standard 4, MD5 use to ensure the integrity of information transmission
OAuth Authentication	An open standard that allows users to use third parties.	Four steps: 1. Obtaining an unauthorized request token 2. Obtain the user authorized request token 3, with the authorized request token change Authentication token 4. Access using authentication token
The difference between DOM and sax	Loading in different ways, the DOM loads all the content at once, and sax reads it while loading.

Android Network module programming

Points	Defined	Describe
USB programming	Universal Serial Bus, a master-slave structure.	The classes involved: Usbmanager, Usbaccessory, Usbdevice, Usbendpoint
WiFi programming	802.11B Standard, the industry standard of wireless communication, features: fast speed, reliable, far away. WiFi Direct connection technology is directly connected via WiFi.	Related classes: Wirelesssettings, Wifisettings, Accesspointdialog, Wifienabler, Wifilayer, Wifimanager, WifiState, WifiService, Wifimonitor, Wifinativie, Scanresult, Wifiinfo, Wificonfiguration. User perspective Five layers: Hardware driver, wpa_supplicant, JNI, Wifi Api, wifisettings application. Classes involved in direct connection: Wifip2pmanager
Bluetooth programming	A wireless technology to support short-distance communication of equipment	Classes involved: Bluetoothadapter, Bluetoothdevice, Bluetoothsocket
NFC Programming	Near-distance wireless communication technology, 3 modes of operation: active, passive, two-way. Application: Contact through, contact payment, contact connection, contact browsing.	Classes involved: Nfcadapter, Ndefmessage, Ndefrecord

The application of VoIP based on SIP protocol

Points	Defined	Describe
SIP protocol	Session Initiation Protocol for creating, modifying, and terminating interactive sessions, including video, voice, instant messaging, online games, and multimedia elements such as virtual reality.	Signaling control protocol for the application layer.
What protocol is used for transmission?	UDP protocol and TCP protocol
The comparison of the Protocol and the SIP protocol	1. The binary method of ASN.1 and compression coding rules is used to express its message, SIP is based on text protocol. 2, the multi-point control unit, all terminals to the MCU to send control messages; SIP is a distributed call model with multicast capability.
What constitutes a SIP session?	Four components: 1, SIP user agent (terminal equipment) 2. SIP registration Server (database containing the location of all user agents in the domain) 3, SIP Proxy Server (interface UA session request and query the SIP registration server, get the address information of the recipient UA) 4. SIP redirection Server (allow SIP proxy to talk about SIP session invitation information directed to external domain)

Instant communication based on XMPP protocol

Points	Defined	Describe
XMPP protocol	Extensible Message Processing Site Protocol	An open real-time communication protocol based on XML.
The XMPP client address for Android	http://asmack.freakempire.de/

Android's handling of HTML

Points	Defined	Describe
HTML Processing Key class	Android HTML Processing key class in the source Frameworks/base/core/java/android/webkit directory
Key classes and descriptions	1. Accessibilityinjector provides WebView with access to JavaScript and its related content. 2, Autocompletepopup according to the input content is not complete automatically 3. Browserframe the Java layer encapsulation of the frame object in the WebCore. 4, CacheManager cache management object. 5, Callbackproxy processing WebCore and UI thread message proxy class 6. Certool WebView Certificate Tool 7. Clientcerrequesthandler Processing Client certificate Request 8. Consolemessage JavaScript Console messages 9. Cookiemanager Cookie Management Object 10. Cookiemanagerclassic Cookiemanager Extended Implementation class 11, Cookiesyncmanager cookie Synchronization Management object, responsible for synchronizing the RAM and flash between the cookies data. 12, Datasorter date sorting 13. DebugFlags Debug Mark 14, Devicemotionandorientationmanager realize Devicemotion and deviceorientation 15, Devicemotionservice realizes Sensoreventlistener interface, processing direction change. 16, Downloadlistener download monitor 17. Findactionmodecallback Search Action Callback 18. Geolocationpermissions WebView's Location JavaScript API Rights Management 19. Geolocationpermissionsclassic geolocationpermissions Extension class that handles WebKit threads that are called in the UI thread. 20, Geolocationservice package position monitoring. 21. Html5audio Audio Support class 22. Html5videofullscreen Full Screen Video view 23. Html5videoinline Embedded Video View 24. Html5videoview Browser Video View 25. Html5videoviewproxy Video View Processing class 26, Httpauthhandler processing HTTP authentication request 27, Jwebcorejavabridge for Java and WebCore Library timer and cookie object interaction Bridge 28. The utility class used by Jniutil JNI to obtain the information that C code such as the cache directory cannot obtain directly, and to read the files in the resource bundle. 29, Jspromptresult JS results hint, prompted JavaScript running results. 30, Jsresult JS results, user interaction. 31, Keystorehandler is responsible for installing the certificate to the System key store, read the certificate from the network to Certtool. 32. L10nutils is responsible for the internationalization of strings	33. Mimetypemap MIME Type mapping 34, mockgeolocation simulation location information 36. Mustoverrideexception Extended run-time error 37. Overscrollglow used to achieve overscroller results 38. Plugin defines the plug-in class 39, Plugindata plug-in data 40, Pluginfullscreenholder get plug-in view of the size of the container, responsible for display and other operations. 41, pluginlist Maintenance plug-in list 42, PlugInManager plug-in management class 43, Pluginstub WebView Implementation plug-in interface 44. QUADF defines a quadrilateral 45. SearchBox Search dialog Box interface 46, Searchboximpl Search dialog box interface implementation 47. Selectactionmodecallback Select Action Callback 48. Sslcertlookuptable the decision to store whether a user is using a certificate 49, Sslclientcertlookuptable Save the client certificate user selection 50. Sslerrorhandler Handling SSL Error 51. Urlutil URL using processing class 52. Valuecallback callback interface for returning data values asynchronously 53. Viewmanager View Management class, manage plug-in view 54. Viewstateserializer WebView View serialization and deserialization 55. List of historical data displayed in the Webbackforwardlist WebView object 56, Webbackforwardlistclient browsing History Processing Client interface 57. Webchromeclient Chrome Client 58. Webcorethreadwatchdog WebCore Watchdog 59, Webhistoryitem a Web page data 60. Webicondatabase Icon Database Management Object 61. Webicondatabaseclassic Webicondatabase Extension class 62. Webresourceresponse Package Resource response information 63, WebSettings WebView management settings data, through the JNI interface from the bottom to obtain. 64. WebStorage Database 65. Websyncmanager data synchronization Management object for synchronous operation of RAM data and flash data. 66. Webtextview displays the system native editing component when the HTML text input control is activated. 67. WebView View Object 68. Webviewclient The Web View client object, which is notified when an event occurs in the Web view. 69. Webviewdatabase Database 70, Webviewfactory WebView embedded in fragment. 71, Webviewfragment Ebview embedded in fragment. 72, Zoomcontrolbase zoom control interface. 73, zoomcontrolembedded built-in zoom control. 74, Zoommanager Maintenance WebView Zoom state.

Android Network Processing Analytics

The

Points	Defined	Describe
Network processing Key class	Android HTML network processing key classes in the source frameworks/base/core/java/android/net directory
key class and describes the status of	1, Connectivitymanager for querying network connections. 2, Credentials unix identity information 3, dhcpinfo   A DHCP Request result object 4, Localserversocket   Create a non-standard class for the downstream UNIX domain socket 5, Localsocket   Create a non-server socket in the UNIX domain namespace 6, localsocketaddress  socket address 7, MailTo   Parse the MAILTO Protocol format URL 8, networkinfo Description network interface Status 9, proxy Access user and default proxy settings class 10, sslcertificatesocketfactory   Additional details for SSL operations 11, Sslsessioncache  ssl Session cache 12, trafficstats   network traffic statistics 13, Uri   An immutable URL reference 14. Uri.builder   Create an auxiliary class for URL reference 15, urlquerysanitizer   Filter URL query 16, Urlquerysanitizer.illegalcharactervaluesanitizer filter illegal values with the characters they contain 17, Urlquerysanitizer.parametervaluepair Simple tuple of parameter value pairs 18, vpnservice   Apply extension and build your own VPN solution base class 19, Vpnservice.builder   Create a secondary class for the VPN interface
HTTP processing classes for Android encapsulation	1, androidhttpclient (essentially Apache Defaulthttpclient class on Android implementation) 2, Defaulthttpclient (an HTTP client) 3, the SSL authentication Information processing class (SSL protocol implementation and the digital certificate correlation, relates the class: Sslcertificate, Sslerror)	1. Androidhttpclient cannot be executed in the main thread, Defaulthttpclient is executed in the main thread. 2. Androidhttpclient obtains the instance through the static method Newinstance, and Defaulthttpclient creates the object. 3, defaulthttpclient The default start cookie, but the default does not retain cookies, if you want to retain the need to add Cookiestore to HttpContext.
Android RTP Protocol	Real-time transmission protocol, which is used to provide end-to-end real-time transmission service for multimedia data such as voice, image, fax and so on in IP network. The RTP protocol details the standard packet format for delivering audio and video.	Classes involved: Audiocodec, Audiostream, Audiogroup, Rtpstream.

Summarize

The book explains in detail the main points of Android development, and the source case for detailed explanation, so that the author from the principle of deepening the understanding of the relevant knowledge points.