android外文翻譯--深入理解安卓系統(tǒng)的安全性-android-資料下載頁(yè)
2025-01-19 06:37本頁(yè)面
【導(dǎo)讀】盡管androidSDK自2021年就發(fā)布了，但是第一部android手。機(jī)卻在2021年10月才誕生。自從這時(shí)起谷歌開起了自己的時(shí)代，T-Mobile的。G1的制造商臺(tái)灣HTC估算G1的發(fā)貨量在2021年底已經(jīng)超過(guò)100萬(wàn)部。內(nèi)人士預(yù)期該G1手機(jī)的銷量將會(huì)在2021年繼續(xù)保持。不久的將來(lái)其他許多手。機(jī)供應(yīng)商要計(jì)劃支持這個(gè)系統(tǒng)。一個(gè)Android的主要賣點(diǎn)是它使開發(fā)人員無(wú)縫把在線。這方面最明顯的例子是谷歌的緊密集成Gmail，日歷和聯(lián)系人。用戶只需提供一個(gè)android用戶名和密碼，其手機(jī)自。動(dòng)同步與谷歌的服務(wù)。其他廠商正在迅速適應(yīng)自己的現(xiàn)有的即時(shí)通訊，社交網(wǎng)絡(luò)。Android和許多企業(yè)尋找新途徑來(lái)整合他們的自己已有的業(yè)務(wù)到。傳統(tǒng)的臺(tái)式機(jī)和服務(wù)器的操作系統(tǒng)一直在努力進(jìn)行安全功能的集成。Android沒(méi)有停在為其他平臺(tái)。用戶應(yīng)用進(jìn)行身份驗(yàn)證。發(fā)人員開發(fā)android應(yīng)用人士透露，設(shè)計(jì)安全應(yīng)用程序并不總是直線前進(jìn)的。Android應(yīng)用程序框架對(duì)開發(fā)者來(lái)說(shuō)是一個(gè)強(qiáng)制架構(gòu)。圖1顯示了FriendTracker和FriendViewer應(yīng)用所包含的不同的組件類型。
【正文】 ewer application bis primarily concerned with showing information about friends’ locations. The FriendViewer activity lists all friends and their geographic coordinates, and the FriendMap activity displays them on a map. The FriendReceiver broadcast receiver waits for messages that indicate the physical phone is near a particular friend and displays a message to the user upon 5 such an event. Although we could have placed these ponents within the FriendTracker application, we created a separate application to demonstrate crossapplication munication. dditionally, by separating the tracking and user interface logic, we can create alternative user interfaces with different displays and features—that is, many applications can reuse the logic performed in Interaction The primary mechanism for ponent interaction is an intent, which is simply a message object containing a destination ponent address and data. The Android API defnes methods that accept intents, and uses that information to start activities (startActivity(Intent)), start services (startService (Intent)), and broadcast messages (sendBroadcast(Intent)). The invocation of these methods tells the Android framework to begin executing code in the target application. This process of interponent munication is known as an action. Simply put, an intent object defnes the “intent” to perform an “action.”O(jiān)ne of Android’s most powerful features is the fexibility allowed by its intentaddressing mechanism. Although developers can uniquely address a target ponent using its application’s namespace, they can also specify an implicit name. In the latter case, the system determines the best ponent for an action by considering the set of installed applications and user choices. The implicit name is called an action string because it specifes the type of requested action—for example, if the “VIEW” action string is specifed in an intent with data felds pointing to an image fle, the system will direct the intent to the preferred image viewer. Developers also use action strings to broadcast a message to a group of broadcast receivers. On the receiving end, developers use an intent flter to subscribe to specifc action strings. Android includes additional destination resolution rules, but action strings with optional data types are the most 2 shows the interaction between ponents in the FriendTracker and FriendViewer applications and with ponents in applications defned as part of the base Android distribution. In each case, one ponent initiates munication with another. For simplicity, we call this interponent munication (ICC). In many ways, ICC is analogous to 6 interprocess munication (IPC) in Unixbased systems. To the developer, ICC functions identically regardless of whether the target is in the same or diferent application, with the exception of the security rules defned later in this available ICC actions depend on the target ponent. Each ponent type supports interaction specifc to its type for example, when FriendViewer starts FriendMap, the FriendMap activity appears on the screen. Service ponents support start, stop, and bind actions, so the FriendTrackerControl activity, for instance, can start and stop the FriendTracker service that runs in the background. The bind action establishes a connection between ponents, allowing the initiator to execute RPCs defned by the service. In our example, FriendTracker binds to the location manager in the system server.
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