(Android 地图开发) 高德地图添加覆盖物

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);

		}

	}
}