【正文】 范圍 (如 WIFI)性的定位 權(quán)限（后者與使用的 MyLocationOverlay類，在本章后面介紹） （ 2）在你 的 application 中，添加一個 useslibrary元素： android:name =，表明你正在使用一個可選的 Android應(yīng)用程序接口。 然而，你需要有這兩個項目： （ 1） android： apiKey ，在創(chuàng)建中，將需要一個 Google地圖 API密鑰。 在你為 MapActivity子類設(shè)計布局時，你需要添加一個自定義的視圖，在寫這篇文章時用的是， 。然而，牢記以下： (1) 你將需要創(chuàng)建一個合適的項目指標(biāo)，以確保谷歌地圖的應(yīng)用程序界面將是可用的。這可能是設(shè)備一部分而不是設(shè)備的全部。 此外，為了其他顯示選項，根據(jù)其他地圖 數(shù)據(jù)的來源，請睜大你的眼睛去選擇。 條款無情 把谷歌地圖納入你自己的應(yīng)用程序上一般需要一個相當(dāng)長的法律術(shù)語集。但作為一個開發(fā)者，更多和你有關(guān)聯(lián)的是 MapView 類和 MapActivity類 ，這讓地圖融入你自己的應(yīng)用程序中。s because the API key in the source code is invalid for your development 9 machine. Instead, you will need to generate your own API key(s) for use with your application. Full instructions for generating API keys for development and production use can be found on the Android web site ( apis/). In the interest of brevity, let39。 ()。 8 return(true),} Here, we just toss up a short Toast with the snippet from the OverlayItem, returning true to indicate we handled the tap. My, Myself, and MyLocationOverlay Android has a builtin overlay to handle two mon scenarios: ? Showing where you are on the map, based on GPS or other locationproviding logic ? Showing where you are pointed, based on the builtin pass sensor, where available All you need to do is create a MyLocationOverlay instance, add it to your MapView39。 return(true)。} Override protected OverlayItem createItem(int i) { return((i))。 (new OverlayItem(getPoint(,), Lincoln Center, Home of Jazz at Lincoln Center))。 private Drawable marker=null。s purpose. For example, NooYawk uses a layer to show where select buildings are located in the island of Manhattan. Overlay Classes Any overlay you want to add to your map needs to be implemented as a subclass of Overlay. There is an ItemizedOverlay subclass available if you are looking to add pushpins or the like。 Return(true)。s current location or a location saved with some data in your activity. To change the map39。s not terribly useful when they have the whole world in their hands. 4 Since a map of the world is not much good by itself, we need to add a few things, as described next. Exercising Your Control You 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. Zoom The 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。 中文 4128字 畢業(yè)設(shè)計 (論文 )外文資料翻譯 外文出處 Mark Android 2 Chapter 33 1 Mapping with MapView and MapActivity One of Google39。ll cover that mysterious apiKey later in this chapter, in the The Key to It All section. In addition, you will need a couple of extra things in your file: ? The INTERNET and ACCESS_COARSE_LOCATION permissions (the latter for use with the MyLocationOverlay class, described later in this chapter) ? Inside your application, a useslibrary element with android:name =, to indicate you are using one of the optional Android APIs Here is the file for NooYawk: ?xml version=”” encoding=”utf8”? manifest xmlns:android=” package=” usespermission android:name=”android. ” / usespermission android:name=”” / application android:label=string/app_name android:icon=drawable/cw useslibrary android:name=”/ activity android:name=.NooYawk” android:label=string/app_name intentfilter action android:name= / category android:name= / /intentfilter /activity /application /manifest That is pretty much all you need for starters, plus to subclass your activity from MapActivity. If you were to do nothing else, and built that project and tossed it in the emulator, you would get a nice map of the world. Note, however, that MapActivity is abstract. You need to implement i