android 7 1 1 new features

Chapter One overview of Android system porting and driver developmentAndroid 's system architecture is divided into four tiers: theLinux kernel (android uses Linux2.6 as the kernel), C + + code base,Android SDK API(JAVA -written Library ), applications.Androidtransplantation is divided into system transplant and application transplant,Androidsystem Transplant,A

Some of the theoretical aspects of performance optimization, mainly to review, with the theory, Comrade Xiaoping said again, practice is the only standard to test the truth, for memory leaks, now through the Android Studio self-brought tool memory monitor detected. The importance of performance optimization does not need to be stressed, but to emphasize that I am not an old driver, hey! Please open your eyes if you have not used this tool. If you have

interface, only by implementing the interface of the class to implement the method in the interface.Java collection classes: Set, List, Map, Queue.Single structure: All classes in Java are ultimately inherited from the "Object" base class.Look down: equivalent to coercion type conversion, be sure to confirm security before use.Generics: defined using only one uppercase letter, and placed in Garbage collector: Java supports automatic memory allocation and recovery mechanisms, which can have a ce

I. Key features of Java1. Simplicity2. Security3. Portability4. Object-oriented5. Robustness6. Multithreading7. Architecture Neutrality8. Interpretation of implementation9. High Performance10. Distributed11. Dynamic Nature two. J2SE 5 main features 1. Generic 2. Annotations (annotation) 3. Auto-boxing and automatic unpacking 4. Enumeration 5. Enhanced F

packet transmission, and the static routing method does not need to be calculated by the router, however, it relies entirely on network planners. When the network scale is large or the network topology changes frequently, the work that the network administrator needs to do will be very complicated and prone to errors. The dynamic routing method enables the router to automatically calculate new route information according to specific algorithms to ada

implementation part. 4. MethodObjective-C is an object-oriented language, and the definition method is also its basic capability.In objective-C, the method uses the [] operator instead of the "." operator. Sometimes a method call is also called message sending. 5. AttributesAttribute is a concept proposed by objective-C 2.0, It is an alternative to the "Getter" and "setter" methods for accessing member variables, To encapsulate a class, you can access the class through attributes instead of

Java-10.6 finally (1)-Features In this chapter, we will discuss finally. Feature: finally can always be executed. package com.ray.ch10;public class Test {private void test() throws Exception {throw new Exception();}public static void main(String[] args) {try {new Test().test();} catch (Exception e) {e.printStackTrace(

tools, characterized by open source, super plug-in features, can support multiple language development. Of course, Google also launched Android Studio, specifically for Android programs, but because Android studio was just introduced soon, not too stable, after all, the new

: Super. variable; VCall the override method in the parent class, for example: Super. Method ([paramlist]); VCall the constructor of the parent class, for example, super ([paramlist]); Multi-level inheritance Java does not support multi-level inheritance. Constructor call VIn the class hierarchy, the constructor calls the constructor In the derived order, from the superclass (parent class) to the subclass. Final keywords VFinal before the class Indicates that the class is the final class, indic

). The app simply gets a canvas object through Lockcanvas (), invokes its painting method, and then Unlockcanvasandpost () to notify the underlying to display the updated content. Of course, not all applications need to operate directly canva, in fact, only a small number of applications need to directly manipulate the canvas, Android provides a lot of packaged control widgets, the application only need to provide material, such as text, pictures, att

What is a stock? A stock is short for a stock certificate. It is a marketable securities issued by a stock company to shareholders for raising funds as a stock ownership credential and for receiving dividends and dividends. Each share represents a basic unit of ownership of the enterprise. A stock is a part of the capital of a joint-stock company. It can be transferred, traded, or mortgaged. It is the main long-term credit tool of the capital market. As a marketable securities, a stock has the

Script | data | database | Detailed (author: Wang Kaibo) In the current rapid development of the Internet, E-commerce sites in the emerging situation, the Web site development efficiency and quality of more and more high requirements. For large and complex structure, the content of a wide range of sites, to achieve the dynamic site and convenient management. Data management is inseparable from the support of database system. The important sign of a CGI language is its ability to access the bac

ellipsis. After you click the ellipsis, the applicationBar menu. Menus provide portals for functions that are difficult to describe with icons or are not commonly used. A menu can contain up to five menu items. Each menu item has a length of 14-20 English characters and is too long.Characters will be truncated. Remember to "less is more" to simplify the text. The transparency of the application bar can be adjusted freely. The recommended values are 0, 0.5, and