【正文】 用戶，點(diǎn)擊其信息即可彈出添加好友對(duì)話框?！】尚行苑治黾夹g(shù)可行性軟件代碼用Eclipse編寫(xiě)，語(yǔ)言是Java。(2) 支持開(kāi)發(fā)軟件Eclipse 及ADT JDK Android SDK。除了無(wú)線鼠標(biāo)界面外所有界面均用同一個(gè)背景。startActivity(it)?！￡P(guān)機(jī)功能的實(shí)現(xiàn)Java可以調(diào)用cmd命令行程序，而cmd命令中有一個(gè)定時(shí)關(guān)機(jī)的命令：”shutdown s t”可以讓手機(jī)端發(fā)送某一個(gè)特殊的信息，當(dāng)服務(wù)器收到該信息時(shí)執(zhí)行該命令則可實(shí)現(xiàn)關(guān)機(jī)。而是使用了Java中的一個(gè)robot類(lèi)。} break?！o(wú)線鼠標(biāo)功能的設(shè)計(jì)原理Java中的robot類(lèi)可以用于控制鼠標(biāo)，Java程序?qū)崿F(xiàn)自動(dòng)測(cè)試，自動(dòng)演示功能，或者是其它的一些鼠標(biāo)和鍵盤(pán)控制的應(yīng)用。以上就是Robot提供的實(shí)用的鍵盤(pán)鼠標(biāo)控制功能。//獲取當(dāng)前位置橫坐標(biāo)y = (int) ()。try {(outPacket)。rightBtn = (Button) findViewById()。若信息填寫(xiě)不夠完善，系統(tǒng)會(huì)提示補(bǔ)全遺漏的信息。startActivity(it)。圖45 注冊(cè)界面　聊天功能實(shí)現(xiàn)聊天模塊的亮點(diǎn)在于spinner的使用，使用spinner可輕松區(qū)分單個(gè)會(huì)話與所有人會(huì)話，點(diǎn)擊spinner的下拉菜單即可顯示所有在線好友并可選擇其中一個(gè)發(fā)起單個(gè)會(huì)話或者選擇發(fā)給所有人進(jìn)行群聊。//獲取發(fā)送的消息int item =()。 public View getView(int position,View convertView,ViewGroup parent){ViewHolder holder。//文件存放路徑。通過(guò)學(xué)習(xí)Android的控件、布局、Activity、Service等一系列基礎(chǔ)知識(shí)，對(duì)整個(gè)Android的開(kāi)發(fā)有了大致的了解。由于Android應(yīng)用程序的開(kāi)發(fā)離不開(kāi)Java的支持，所以基礎(chǔ)的Java知識(shí)是必須的。大部分預(yù)想的功能都已經(jīng)實(shí)現(xiàn)，甚至有意外地收獲，實(shí)現(xiàn)了無(wú)線鼠標(biāo)。s not terribly useful when they have the whole world in their hands.Since a map of the world is not much good by itself, we need to add a few things, as described next.Exercising Your ControlYou can find your MapView widget by findViewById(), just as with any other widget. The widget itself offers a getMapController() method. Between the MapView and MapController, you have a fair bit of capability to determine what the map shows and how it behaves. The following sections cover zoom and center, the features you will most likely want to use.ZoomThe map of the world you start with is rather broad. Usually, people looking at a map on a phone will be expecting something a bit narrower in scope, such as a few city blocks.You can control the zoom level directly via the setZoom() method on the MapController. This takes an integer representing the level of zoom, where 1 is the world view and 21 is the tightest zoom you can get. Each level is a doubling of the effective resolution: 1 has the equator measuring 256 pixels wide, while 21 has the equator measuring 268,435,456 pixels wide. Since the phone39。Return(true)。 private Drawable marker=null。}Overrideprotected OverlayItem createItem(int i) {return((i))。(new OverlayItem(getPoint(,), The Downtown Club, Original home of the Heisman Trophy))。().add(new SitesOverlay(marker))。return(true)。s locationbased services (covered in Chapter 32) to show where the device is and where it is going.Fortunately, integrating basic mapping features into your Android project is fairly easy. And there is also a fair bit of power available to you, if you want to get fancy.Terms, Not of EndearmentIntegrating Google Maps into your own application requires agreeing to a fairly lengthy set of legal terms. These terms include clauses that you may find unpalatable.If you are considering Google Maps, please review these terms closely to determine if your intended use will not run afoul of any clauses. You are strongly remended to seek professional legal counsel if there are any potential areas of conflict.Also, keep your eyes peeled for other mapping options, based on other sources of map data, such as OpenStreetMap ().Piling OnAs of Android , Google Maps is not strictly part of the Android SDK. Instead, it is part of the Google APIs addon, an extension of the stock SDK. The Android addon system provides hooks for other subsystems that may be part of some devices but not others.NOTE: Google Maps is not part of the Android open source project, and undoubtedly there will be some devices that lack Google Maps due to licensing issues. For example, at the time of this writing, the Archos 5 Android tablet does not have Google Maps.By and large, the fact that Google Maps is in an addon does not affect your daytoday development. However, bear in mind the following:You will need to create your project with a suitable target to ensure the Google Maps APIs will be available.To test your Google Maps integration, you will also need an AVD that supports the Google Maps API.The Bare BonesFar and away the simplest way to get a map into your application is to create your own subclass of MapActivity. Like ListActivity, which wraps up some of the smarts behind having an activity dominated by a ListView, MapActivity handles some of the nuances of setting up an activity dominated by a MapView.In your layout for the MapActivity subclass, you need to add an element named, at the time of this writing, . This is the longhand way to spell out the names of widget classes, by including the full package name along with the class name. This is necessary because MapView is not in the namespace. You can give the MapView widget whatever Android:id attribute value you want, plus handle all the layout details to have it render properly alongside your other widgets.However, you do need to have these two items:Android:apiKey, which in production will need to be a Google Maps API keyAndroid:clickable=true, if you want users to be able to click and pan through your mapFor example, from the Maps/NooYawk sample application, here is the main layout:?xml version= encoding=utf8?RelativeLayout xmlns:Android=Android:layout_width=fill_parent Android:layout_height=fill_parent Android:id=+id/map Android:layout_width= fill_parentAndroid:layout_height=fill_parent Android:apiKey=YOUR_ API_KEY Android:clickable=true //RelativeLayoutWe39。這些問(wèn)題只有自己在實(shí)際開(kāi)發(fā)中才能體會(huì)到并且解決，并且在解決后可以長(zhǎng)時(shí)間的記住。在手機(jī)交互式通信服務(wù)中，學(xué)習(xí)了Android手機(jī)之間進(jìn)行短信發(fā)送、廣播、對(duì)廣播的監(jiān)聽(tīng)、服務(wù)等，在Service類(lèi)中沒(méi)有context，可以通過(guò)Handler來(lái)每秒反復(fù)運(yùn)行，自動(dòng)送出系統(tǒng)廣播信息，同時(shí)在這里我們也知道可以設(shè)計(jì)一個(gè)常用的變量類(lèi)，設(shè)計(jì)一個(gè)當(dāng)前的CurrentActivity這個(gè)變量進(jìn)行控制，進(jìn)行處理。對(duì)常用控件基本掌握其用法，對(duì)其事件的監(jiān)聽(tīng)方法也基本掌握。圖47 文件傳輸界面(2) 文件接收功能的實(shí)現(xiàn)接收方在收到文件時(shí)會(huì)彈出toast詢問(wèn)是否接收，若選擇接收則與服務(wù)端建立連接，由服務(wù)端將發(fā)送方發(fā)的文件轉(zhuǎn)發(fā)給接收方。并在listview上添加監(jiān)聽(tīng)器，點(diǎn)擊文件名時(shí)即選擇該文件，再點(diǎn)擊屏幕下方的確定就將文件傳到了服務(wù)器端，再由服務(wù)器轉(zhuǎn)發(fā)給接收端[15]。 ( new OnItemSelectedListener(){除spinner外其他核心代碼就是獲取用戶要發(fā)送的信息，以及接收端接收信息。否則系統(tǒng)會(huì)因?yàn)檎也坏揭D(zhuǎn)的activity而出錯(cuò)奔潰。(().toString())。其主要原理還