1.題記
提起谷歌Map相信大家都不會陌生，那進入我們今天的話題，如何在Android手機上進行Google Map的開發。
2.Map應用程序的開發
2.1 準備工作
2.1.1 申請Android Map API KEY
?? ? ? ? 步驟一： 找到你的debug.keystore文件，在Eclipse 首選項中可以看到該文件。如下圖：
?
???????????? 步驟二：取得debug.keystore的MD5值
?????????????在命令行下進入debug.keystore文件所在的路徑，執行命令：keytool -list -keystore debug.keystore,會提示輸入密碼，輸入默認密碼“android”，即可取得MD5值。
????????????? 步驟三：申請Android Map的API key。
????????????? 在瀏覽器重輸入網址：http://code.google.com/intl/zh-CN/android/maps-api-signup.html,登錄Google賬號,輸入步驟2中得到的MD5值，即可申請到API Key。記下API Key。
2.1.2 創建基于Google APIs的AVD
?????? 在Eclipse中打開AVD 界面，創建AVD，選擇Target為Google APIs的項，如下圖：
若在Target處無Google APIs選項，請自行添加maps.jar文件。
2.1.3?創建基于Google APIs的工程（略），即選擇Build Target為Google APIs。
2.2 Google Map API的使用
??其類均在com.google.android.maps包中，一下是該包中幾個重要的類：
MapActivity用于顯示Google Map的Activity類，該類為抽象類，開發時請繼承該類，并實現onCreate()方法。在該類中必須創建一個MapView實例。
MapView?用戶顯示地圖的View組件.
MapController?用于控制地圖的移動、縮放等
Overlay?這是一個可顯示于地圖上的可繪制的對象
GeoPoint?一個包含經緯度位置的對象
2.3 實例
2.3.1 創建工程，注意選擇Build Target為“Google APIs”
2.3.2 修改AndroidManifest.xml文件，增加訪問網絡的權限
<uses-permission android:name="android.permission.INTERNET" />
2.3.3 創建Map View，代碼如下：
Xml代碼??
<com.google.android.maps.MapView??????android:id="@+id/MapView01"??????android:layout_width="fill_parent"??????android:layout_height="fill_parent"??????android:apiKey="0u7spJisVnJZmy3X6nX1M01SirYWYgNm-EQZbhQ"/>?? ??? 其中APIKEY即為之前得到的APIkey。
2.3.4 實現MapActivity，代碼和講解如下：
Java代碼??
package?com.sulang.android.map;????import?java.util.List;??import?android.graphics.Bitmap;??import?android.graphics.BitmapFactory;??import?android.graphics.Canvas;??import?android.graphics.Paint;??import?android.graphics.Point;??import?android.os.Bundle;????import?com.google.android.maps.GeoPoint;??import?com.google.android.maps.MapActivity;??import?com.google.android.maps.MapController;??import?com.google.android.maps.MapView;??import?com.google.android.maps.Overlay;??????public?class?Activity01?extends?MapActivity??{??????private?MapView??mMapView;??????private?MapController?mMapController;???????private?GeoPoint?mGeoPoint;????????????@Override??????public?void?onCreate(Bundle?savedInstanceState)??????{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);??????????mMapView?=?(MapView)?findViewById(R.id.MapView01);????????????????????????????????????????????????????????????mMapView.setStreetView(false);????????????????????mMapController?=?mMapView.getController();???????????mMapView.setEnabled(true);??????????mMapView.setClickable(true);????????????????????mMapView.setBuiltInZoomControls(true);?????????????????????mGeoPoint?=?new?GeoPoint((int)?(30.659259?*?1000000),?(int)?(104.065762?*?1000000));????????????????????mMapController.animateTo(mGeoPoint);?????????????????????mMapController.setZoom(12);?????????????????????MyLocationOverlay?myLocationOverlay?=?new?MyLocationOverlay();??????????List<Overlay>?list?=?mMapView.getOverlays();??????????list.add(myLocationOverlay);??????}??????protected?boolean?isRouteDisplayed()??????{??????????return?false;??????}??????class?MyLocationOverlay?extends?Overlay??????{??????????@Override??????????public?boolean?draw(Canvas?canvas,?MapView?mapView,?boolean?shadow,?long?when)??????????{??????????????super.draw(canvas,?mapView,?shadow);??????????????Paint?paint?=?new?Paint();??????????????Point?myScreenCoords?=?new?Point();????????????????????????????mapView.getProjection().toPixels(mGeoPoint,?myScreenCoords);??????????????paint.setStrokeWidth(1);??????????????paint.setARGB(255,?255,?0,?0);??????????????paint.setStyle(Paint.Style.STROKE);??????????????Bitmap?bmp?=?BitmapFactory.decodeResource(getResources(),?R.drawable.home);??????????????canvas.drawBitmap(bmp,?myScreenCoords.x,?myScreenCoords.y,?paint);??????????????canvas.drawText("**廣場",?myScreenCoords.x,?myScreenCoords.y,?paint);??????????????return?true;??????????}??????}??}?? 2.3.5 啟動模擬器，看效果圖：
?
至此關于Google Map的開發已完成，下面是GPS的開發。
3.GPS應用開發
3.1相關API說明
?????關于地理定位系統的API全部位于android.location包內，其中包括以下幾個重要的功能類：
????? LocationManager：本類提供訪問定位服務的功能，也提供了獲取最佳定位提供者的功能。
????? LocationProvider：該類是定位提供者的抽象類。定位提供者具備周期性報告設備地理位置的功能
????? LocationListener：提供定位信息發生改變時的回調功能。必須事先在定位管理器中注冊監聽器對象。
????? Criteria：該類是的應用能夠通過在LocationProvider中設置的屬性來選擇合適的定位提供者.
????? Geocider：用于處理地理編碼和反向地理編碼的類。
??????要使用地理定位，首先需要取得LocationManager的實例：
Java代碼??
locationManager?=?(LocationManager)?getSystemService(context);?? ????? 取得LocationManager對象之后，還需要注冊一個周期性的更新視圖：
Java代碼??
locationManager.requestLocationUpdates(provider,?3000,?0,locationListener);?? ????? 其中第一個參數是設置服務提供者，第二個參數是周期。最后一個參數是用來監聽定位信息的改變的。
3.2 具體實例
3.2.1 在AndroidManifest.xml文件中添加權限，代碼如下：
?
Xml代碼??
<?xml?version="1.0"?encoding="utf-8"?>??<manifest?xmlns:android="http://schemas.android.com/apk/res/android"??????package="com.sulang.android.map"?android:versionCode="1"??????android:versionName="1.0">??????<uses-sdk?android:minSdkVersion="3"?/>????????<application?android:icon="@drawable/icon"?android:label="@string/app_name">??????????<uses-library?android:name="com.google.android.maps"?/>??????????<activity?android:name=".Activity01"?android:label="@string/app_name">??????????????<intent-filter>??????????????????<action?android:name="android.intent.action.MAIN"?/>??????????????????<category?android:name="android.intent.category.LAUNCHER"?/>??????????????</intent-filter>??????????</activity>??????</application>??????<uses-permission?android:name="android.permission.INTERNET"?/>??????<uses-permission?android:name="android.permission.ACCESS_COARSE_LOCATION"?/>??????<uses-permission?android:name="android.permission.ACCESS_FINE_LOCATION"?/>??</manifest>?? 3.2.2 給模擬器設置個默認的坐標值
?啟動Eclipse ，選擇Window ->Show View?打開?Emulator Control 界面即可進行設置。
3.2.3 實現MapActivity
?具體代碼和講解如下：
Java代碼??
package?com.sulang.android.map;????import?java.io.IOException;??import?java.util.List;??import?java.util.Locale;????import?android.content.Context;??import?android.graphics.Bitmap;??import?android.graphics.BitmapFactory;??import?android.graphics.Canvas;??import?android.graphics.Paint;??import?android.graphics.Point;??import?android.location.Address;??import?android.location.Criteria;??import?android.location.Geocoder;??import?android.location.Location;??import?android.location.LocationListener;??import?android.location.LocationManager;??import?android.os.Bundle;??import?android.view.Menu;????import?com.google.android.maps.GeoPoint;??import?com.google.android.maps.MapActivity;??import?com.google.android.maps.MapController;??import?com.google.android.maps.MapView;??import?com.google.android.maps.Overlay;??????????public?class?MyMapActivity?extends?MapActivity?{??????public?MapController?mapController;??????public?MyLocationOverlay?myPosition;??????public?MapView?myMapView;??????private?static?final?int?ZOOM_IN?=?Menu.FIRST;??????private?static?final?int?ZOOM_OUT?=?Menu.FIRST?+?1;????????@Override??????protected?boolean?isRouteDisplayed()?{??????????return?false;??????}????????class?MyLocationOverlay?extends?Overlay?{??????????Location?mLocation;??????????????????????public?void?setLocation(Location?location)?{??????????????mLocation?=?location;??????????}????????????@Override??????????public?boolean?draw(Canvas?canvas,?MapView?mapView,?boolean?shadow,??????????????????long?when)?{??????????????super.draw(canvas,?mapView,?shadow);??????????????Paint?paint?=?new?Paint();??????????????Point?myScreenCoords?=?new?Point();????????????????????????????GeoPoint?tmpGeoPoint?=?new?GeoPoint(??????????????????????(int)?(mLocation.getLatitude()?*?1E6),?(int)?(mLocation??????????????????????????????.getLongitude()?*?1E6));??????????????mapView.getProjection().toPixels(tmpGeoPoint,?myScreenCoords);??????????????paint.setStrokeWidth(1);??????????????paint.setARGB(255,?255,?0,?0);??????????????paint.setStyle(Paint.Style.STROKE);??????????????Bitmap?bmp?=?BitmapFactory.decodeResource(getResources(),??????????????????????R.drawable.home);??????????????canvas.drawBitmap(bmp,?myScreenCoords.x,?myScreenCoords.y,?paint);??????????????canvas.drawText("Here?am?I",?myScreenCoords.x,?myScreenCoords.y,??????????????????????paint);??????????????return?true;????????????}????????}????????@Override??????protected?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);????????????????????LocationManager?locationManager;??????????String?context?=?Context.LOCATION_SERVICE;??????????locationManager?=?(LocationManager)?getSystemService(context);??????????myMapView?=?(MapView)?findViewById(R.id.MapView01);????????????????????mapController?=?myMapView.getController();??????????myMapView.setEnabled(true);??????????myMapView.setClickable(true);????????????????????myMapView.setSatellite(true);??????????myMapView.setStreetView(true);????????????????????myMapView.setBuiltInZoomControls(true);???????????myMapView.displayZoomControls(true);????????????????????mapController.setZoom(17);??????????myPosition?=?new?MyLocationOverlay();??????????List<Overlay>?overlays?=?myMapView.getOverlays();??????????overlays.add(myPosition);????????????????????Criteria?criteria?=?new?Criteria();????????????????????criteria.setAccuracy(Criteria.ACCURACY_FINE);??????????criteria.setAltitudeRequired(false);??????????criteria.setBearingRequired(false);??????????criteria.setCostAllowed(false);??????????criteria.setPowerRequirement(Criteria.POWER_LOW);????????????????????String?provider?=?locationManager.getBestProvider(criteria,?true);????????????????????Location?location?=?locationManager.getLastKnownLocation(provider);????????????????????updateWithNewLocation(location);??????????????????????????????locationManager.requestLocationUpdates(provider,?3000,?0,??????????????????locationListener);????????}????????private?void?updateWithNewLocation(Location?location)?{??????????String?latLongString;????????????String?addressString?=?"沒有找到地址\n";????????????if?(location?!=?null)?{????????????????????????????myPosition.setLocation(location);????????????????????????????Double?geoLat?=?location.getLatitude()?*?1E6;??????????????Double?geoLng?=?location.getLongitude()?*?1E6;????????????????????????????GeoPoint?point?=?new?GeoPoint(geoLat.intValue(),?geoLng.intValue());????????????????????????????mapController.animateTo(point);??????????????double?lat?=?location.getLatitude();??????????????double?lng?=?location.getLongitude();??????????????latLongString?=?"經度："?+?lat?+?"\n緯度："?+?lng;????????????????double?latitude?=?location.getLatitude();??????????????double?longitude?=?location.getLongitude();????????????????????????????Geocoder?gc?=?new?Geocoder(this,?Locale.getDefault());??????????????try?{????????????????????????????????????List<Address>?addresses?=?gc.getFromLocation(latitude,??????????????????????????longitude,?1);??????????????????StringBuilder?sb?=?new?StringBuilder();??????????????????if?(addresses.size()?>?0)?{??????????????????????Address?address?=?addresses.get(0);??????????????????????for?(int?i?=?0;?i?<?address.getMaxAddressLineIndex();?i++)??????????????????????????sb.append(address.getAddressLine(i)).append("\n");????????????????????????sb.append(address.getLocality()).append("\n");??????????????????????sb.append(address.getPostalCode()).append("\n");??????????????????????sb.append(address.getCountryName());??????????????????????addressString?=?sb.toString();??????????????????}??????????????}?catch?(IOException?e)?{??????????????}??????????}?else?{??????????????latLongString?=?"沒有找到坐標.\n";??????????}??????????????????????????}????????private?final?LocationListener?locationListener?=?new?LocationListener()?{????????????????????public?void?onLocationChanged(Location?location)?{??????????????updateWithNewLocation(location);??????????}??????????????????????public?void?onProviderDisabled(String?provider)?{??????????????updateWithNewLocation(null);??????????}??????????????????????public?void?onProviderEnabled(String?provider)?{??????????}??????????????????????public?void?onStatusChanged(String?provider,?int?status,?Bundle?extras)?{??????????}??????};??}?? ??
?
至此 GPS 應用開發完畢。
源代碼
- maps.rar?(47.1 KB)
- 下載次數: 78
轉載于:https://www.cnblogs.com/tfy1332/p/3653417.html
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