[Android]googleMap的简单使用，地图定位，图标绘制。
首先项目要设置成支持googlemap的api，在Project Build Target中选择google APIs。manifest需要加上权限设置。(写在</application>下)
<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"/>
布局中加上mapview。 apikey需要自己去申请，具体在网上找教程很多。
<com.google.android.maps.MapView android:id="@+id/map" android:apiKey="**********************************" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" />
初始化mapview
private void initMapView() {map = (MapView) findViewById(R.id.map);projection = map.getProjection();mapControlle = map.getController();map.setTraffic(false);// 交通模式map.setSatellite(false);// 卫星模式map.setBuiltInZoomControls(true);// 打开缩放控件}
定位我的位置
showLocation(getCurrentGeoPoint());//我的位置// 定位private void showLocation(GeoPoint location) {if (null != location) {mapController.animateTo(location);mapController.setZoom(15);//缩放等级1-21}}// 获得当前经纬度并返回GeoPoint对象private GeoPoint getCurrentGeoPoint() {LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);return new GeoPoint((int) (location.getLatitude() * 1e6),(int) (location.getLongitude() * 1e6));}
添加目的地(另一个经纬度坐标)
初始化定位信息
GeoPoint endGeoPoint = new GeoPoint(39950017,116310144);
private void initLocation() { final MyLocationOverlay overlay;overlay = new MyLocationOverlay(this, map);//建地图层 overlay.enableMyLocation(); // 监听来自位置的更新overlay.runOnFirstFix(new Runnable() {//每次更新执行public void run() {mapController.setZoom(17);//缩放mapController.animateTo(overlay.getMyLocation());//指定地图显示所在位置}});map.getOverlays().add(overlay);//将定位层加入坐标层中 map.getOverlays().add(new PointOverlay(endGeoPoint));//加入终点图标}
//绘制图标，将这个类的对象加入Overlays中，自动调用draw方法 private Projection projection;class PointOverlay extends Overlay {private GeoPoint geoPoint;public PointOverlay() {}public PointOverlay(GeoPoint geoPoint) {this.geoPoint = geoPoint;}public void draw(Canvas canvas, MapView mapv, boolean shadow) {super.draw(canvas, mapv, shadow);Point point = new Point();projection.toPixels(geoPoint, point);Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.arrow_add);Paint paint = new Paint();canvas.drawBitmap(bmp, point.x, point.y, paint);}}
这样在布局中加两个按钮点击后调用showLocation就可以实现将地图定位到指定地点。显示定位地点图标。
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