android面试题集锦（Android面试题集锦）Topic 1What are the four major components of Android and their role?1,Activity: Activity is the An droid program interac ts with the user s window, Android building blocks is one of the most basic, it needs to main tain the interface state, do a lot of persiste nt things, the proper management of life cycle and some jump logic2,service: background service in Activity, package has a complete function logic implementation, accept the upper command, complete related things, define the need to accept the Intent, provide synchronous and asynchronous interface3,Content: Provider is the access scheme of the third party application data provided by Android, can be derived Content class Provider, can provide data outside, like databases selection sort, storage details shielding internal data, provides the unified interface model, greatly simplifies the application, provides a more convenient way of data integration4,Broadcast Receiver: accept one or more Intent trigger events, accept relevant messages, do some simple processing, convert to a Notification, unify the Android event broadcast modelTopic 2Please describe how ContentProvider implements data sharingCreate your own Content provider, or add your data to an existi ng Contentprovider, provided that you have the same data type and have the permission to write to the Content provider・Topic 3How do you evaluate the Android system? Advantages and disadvantages?Android platform mobile phone 5 advantages: first, open, in terms of advantages, Android platform is the first of its development, development platform, allowing any mobile terminal vendors to join the Android alliance・Significant openness allows it to have more developers, and as users and applications become richer, a new platform will soon mature・Openness for the development of Android, is conducive to the accumulation of popularity, including the popularity of consumers and vendors here, and for consumers, with the big benefit is rich software resources・Open platforms also bring greater competition, so consumers will be able to buy their favorite handsets at lower prices ・ Two, get rid of operators in bondage to the past for a long period of time, especially in Europe and America, mobile phone applications often by operators using constraints, what what function access network, almost all control operators・ From last year，s iPhone listing, users can more easily connect to the network and reduce the operator's constraints・ With EDGE, HSDPA the 2G to 3G mobile network gradually transition and upgrade, mobile phone free access network is not operating the mouth of the joke, when you can use mobile phone IM software easy to chat, and then recall shortly before the price of MMS and download service, is not a nightmare? Android terminal, which is promoted by theIn ter net gia nl Google, is in here ntly a network of features that will allow users to get closer to the internet・Three, rich selectionof hardware which is still open and An droid platform, due to the openness of Android, many manufacturers will introduce all sorts of strange things, a variety of products of distinctive features・ The differences between the function and the characteristic, it will not affect the data synchronization, even compatible software, like you to switch to the apple iPhone from the NOKIA Symbian style mobile phone at the same time, Symbian will also be excellent software to use iPhone, contacts and other data can be more easily transferred, is not very convenient? The developers of Android platform four, without any restrictions to provide third partydevelopers a very broad and free environment, not affected by various restrictions and fetters of the obstruction, as can be imagined, there will be many novel and unique software will be born. But there are also two sides, and bloody, violent, erotic procedures and games, such as "control", are one of the problems left by Android. The application of Google five, seamless integration now chicha Internet Google has gone through 10 year history,From the search giant to comprehensive Internet penetration, Google services such as maps, email, search has become an important link between users and Internet, mobile phone and Android platform combined with the excellent Google service・ Again, Android，s 5 major shortcomings: first, security and privacy, because of the close connection between the mobile phone and the Internet, personal privacy is difficult to be conservative・ In addition to the Internet during the day or inadvertently left the personal footprint, the giant Google always stand behind you, see everything, therefore, it will bring a new round of Internet privacy crisis・Two, the first sale of Android mobile phone is not the biggest operator as everyone knows, T-Mobi 1 e in 23, in the United States of New York released the first mobile phone G1 Android・ But in the North American market, the two largest operators are AT&T and Verizon, only T-Mobile and Sprint and Android have knownmobile phone sales rights, including the T-Mobile 3G network compared to the other three also very many, therefore, users can buy to buy the Gl, whether to experience the 3G network service best is another matter the! Three, operators can still affect the Android mobile phone in the domestic market, many users of mobi 1 e custom machine with purchase, purchase of mobile phone is feeling the graffiti advertising・ This situation also occurs in foreign markets・ Android，s other offering operator, Sprint, will have its mobi 1 e phone store program in its mode 1. Four, the same type of users to reduce, in many mobile forums will have a sub forum for a model, the use of a mobile phone experience exchange, and share software resources・ For Android platform mobile phones, because manufacturers are rich, product types are diverse, so the use of the same model of users less and less, the lack of unified model of the program to strengthen. Take a slightly inappropriate example, and now that the Shanzhai machines are flooded with different varieties, there are very few discussions and groups specifically aimed at one type of Shanzhai machine, apart from the most eye-catching and highly sought after models・ When Windows Xp system five, rely on developers lack of standard in use at PC, Microsoft Windows Media Player will be built in such a browser program, the user can select more players, such as Realplay or storm etc•・But starting with the default program can handle a variety ofrequirements as we11・In the Android platform, because of its openness, greater reliance on third party software, such as Android system SDK has no built-in music player, all rely on third party development, the lack of uniformity of product・Topic 4A brief explanation of activity, intent, intent, filter, service, Broadcase, BroadcaseReceiver?A activity presents a user can operate the visual user interface of a service contains no visible user interface, but in the background of infinite operation can be connected to a running service, connection, can be exposed through service excuse communicating with a broadcast receiver is a radio receiver the message and respond to the component intent:content provider interface is not activated, the request to ContentResolver when receiving broadcastreceiver・Activity, service, and broadcast receiver are asynchronous message activation called intents・ A intent is a Intent object that holds the contents of the message・For activity and service, it specifies the operation name of the request and the URI component object to be manipulated, and the Intent object can explicitly specify a target・ If this is the case, Android will find the component (based on the declaration in the manifest file) and activate it. However, if an object is not explicitly specified, Android must find the best intent in response to component ・ It does this by comparing the Intent object to the target's intent filter・一个组件的意图过滤器告诉Android该组件能处理的intent, intent 滤波器也是在体现文件中声明的。
