(Android 地图开发) 高德地图添加覆盖物

小鱼儿 2023-10-19 00:59 173阅读 0赞

效果截图：

![Center][]

源代码：

package com.rf.mapabc;
    
    import com.amap.mapapi.core.GeoPoint;
    import com.amap.mapapi.map.MapActivity;
    import com.amap.mapapi.map.MapController;
    import com.amap.mapapi.map.MapView;
    import com.amap.mapapi.map.Overlay;
    import com.amap.mapapi.map.Projection;
    import com.baidu.location.BDLocation;
    import com.baidu.location.BDLocationListener;
    import com.baidu.location.LocationClient;
    import com.baidu.location.LocationClientOption;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Point;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    
    public class MainActivity extends MapActivity {
    	private MapView mMapView;
    	private MapController mMapController;
    	private GeoPoint point;
    
    	// 百度地图LBS定位
    	private LocationClient mLocationClient;
    	private MyLocationListener locationlistener;
    
    	// 主线程Handler
    	private Handler handler = new Handler() {
    		@Override
    		public void handleMessage(Message msg) {
    			// TODO Auto-generated method stub
    			switch (msg.what) {
    			case 0:
    				Bundle bundle = msg.getData();
    				double lat = bundle.getDouble("x");
    				double lng = bundle.getDouble("y");
    				point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
    				MyOverlays overlay = new MyOverlays(point);
    
    				mMapController.setCenter(point); // 设置地图中心点
    				mMapController.setZoom(12); // 设置地图zoom级别
    
    				mMapView.getOverlays().clear();
    				mMapView.getOverlays().add(overlay);
    				break;
    			}
    		}
    	};
    
    	@Override
    	/**
    	 *显示栅格地图，启用内置缩放控件，并用MapController控制地图的中心点及Zoom级别
    	 */
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.mapview);
    		// 获取地图组件
    		mMapView = (MapView) findViewById(R.id.mapView);
    		mMapView.setBuiltInZoomControls(true); // 设置启用内置的缩放控件
    		mMapController = mMapView.getController(); // 得到mMapView的控制权,可以用它控制和驱动平移和缩放
    		point = new GeoPoint((int) (39.982378 * 1E6), (int) (116.304923 * 1E6)); // 用给定的经纬度构造一个GeoPoint，单位是微度
    																					// (度
    																					// *
    																					// 1E6)
    		mMapController.setCenter(point); // 设置地图中心点
    		mMapController.setZoom(12); // 设置地图zoom级别
    
    		// 百度地位
    		mLocationClient = new LocationClient(this);
    		locationlistener = new MyLocationListener(handler);
    		mLocationClient.registerLocationListener(locationlistener);
    		mLocationClient.start();
    		if (mLocationClient != null && mLocationClient.isStarted()) {
    			setLocationOption();
    			mLocationClient.requestLocation();
    		}
    	}
    
    	// 实时位置的显示的问题（LBS）
    	public class MyLocationListener implements BDLocationListener {
    		private Handler handle;
    
    		public MyLocationListener(Handler handle) {
    			super();
    			this.handle = handle;
    		}
    
    		@Override
    		public void onReceiveLocation(BDLocation location) {
    			// TODO Auto-generated method stub
    			// 获取经纬度
    			double x = location.getLatitude();
    			double y = location.getLongitude();
    
    			Message message = new Message();
    			Bundle bundle = new Bundle();
    			bundle.putDouble("x", x);
    			bundle.putDouble("y", y);
    			message.setData(bundle);
    			message.what = 0;
    			handle.sendMessage(message);
    
    		}
    
    		@Override
    		public void onReceivePoi(BDLocation arg0) {
    			// TODO Auto-generated method stub
    		}
    	}
    
    	// 查询条件显示
    	private void setLocationOption() {
    		LocationClientOption option = new LocationClientOption();
    		option.setOpenGps(true);
    		option.setAddrType("all");// 返回的定位结果包含地址信息
    		option.setCoorType("bd09ll");// 返回的定位结果是百度经纬度,默认值gcj02
    		option.setScanSpan(5000);// 设置发起定位请求的间隔时间为5000ms
    		option.disableCache(true);// 禁止启用缓存定位
    		option.setPoiNumber(5); // 最多返回POI个数
    		option.setPoiDistance(1000); // poi查询距离
    		option.setPoiExtraInfo(true); // 是否需要POI的电话和地址等详细信息
    		mLocationClient.setLocOption(option);
    	}
    
    	// 地图添加覆盖物（Overlay覆盖物的基类）
    	public class MyOverlays extends Overlay {
    		// 经纬度坐标
    		GeoPoint gp;
    
    		public MyOverlays(GeoPoint gp) {
    			super();
    			this.gp = gp;
    		}
    
    		@Override
    		public void draw(Canvas canvas, MapView mapView, boolean arg2) {
    			// TODO Auto-generated method stub
    			// 获取mapView 的Projection对象
    			Projection projection = mapView.getProjection();
    			Point point = new Point();
    			// 将地理位置转化为屏幕坐标
    			projection.toPixels(gp, point);
    			// 画笔相关设置
    			Paint paintText = new Paint();
    			paintText.setColor(Color.BLUE);
    			paintText.setTextSize(18);
    			// 图片资源
    			Bitmap pic = BitmapFactory.decodeResource(getResources(),
    					R.drawable.da_marker_red); // 得到Bitmap对象
    			canvas.drawBitmap(pic, point.x - 20, point.y - 32, paintText); // 绘图
    			// 绘制文本
    			paintText.setAlpha(18);
    			canvas.drawCircle(point.x, point.y, 120, paintText);
    
    		}
    
    	}
    }

[Center]: https://img-blog.csdn.net/20130814175943875?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhvdXpoaXdlbmdhbmc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center