OverlayDemo.java

package baidumapsdk.demo;

import android.app.Activity;
import android.graphics.Point;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.BaiduMap.OnMarkerClickListener;
import com.baidu.mapapi.map.BitmapDescriptor;
import com.baidu.mapapi.map.BitmapDescriptorFactory;
import com.baidu.mapapi.map.GroundOverlayOptions;
import com.baidu.mapapi.map.InfoWindow;
import com.baidu.mapapi.map.InfoWindow.OnInfoWindowClickListener;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.Marker;
import com.baidu.mapapi.map.MarkerOptions;
import com.baidu.mapapi.map.OverlayOptions;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.model.LatLngBounds;

/**
 * 演示覆盖物的用法
 */
public class OverlayDemo extends Activity {

	/**
	 * MapView 是地图主控件
	 */
	private MapView mMapView;
	private BaiduMap mBaiduMap;
	private Marker mMarkerA;
	private Marker mMarkerB;
	private Marker mMarkerC;
	private Marker mMarkerD;
	private InfoWindow mInfoWindow;

	// 初始化全局 bitmap 信息，不用时及时 recycle
	BitmapDescriptor bdA = BitmapDescriptorFactory
			.fromResource(R.drawable.icon_marka);
	BitmapDescriptor bdB = BitmapDescriptorFactory
			.fromResource(R.drawable.icon_markb);
	BitmapDescriptor bdC = BitmapDescriptorFactory
			.fromResource(R.drawable.icon_markc);
	BitmapDescriptor bdD = BitmapDescriptorFactory
			.fromResource(R.drawable.icon_markd);
	BitmapDescriptor bd = BitmapDescriptorFactory
			.fromResource(R.drawable.icon_gcoding);
	BitmapDescriptor bdGround = BitmapDescriptorFactory
			.fromResource(R.drawable.ground_overlay);

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_overlay);
		mMapView = (MapView) findViewById(R.id.bmapView);
		mBaiduMap = mMapView.getMap();
		MapStatusUpdate msu = MapStatusUpdateFactory.zoomTo(14.0f);
		mBaiduMap.setMapStatus(msu);
		initOverlay();
		mBaiduMap.setOnMarkerClickListener(new OnMarkerClickListener() {
			public boolean onMarkerClick(final Marker marker) {
				Button button = new Button(getApplicationContext());
				button.setBackgroundResource(R.drawable.popup);
				final LatLng ll = marker.getPosition();
				Point p = mBaiduMap.getProjection().toScreenLocation(ll);
				p.y -= 47;
				LatLng llInfo = mBaiduMap.getProjection().fromScreenLocation(p);
				OnInfoWindowClickListener listener = null;
				if (marker == mMarkerA || marker == mMarkerD) {
					button.setText("更改位置");
					listener = new OnInfoWindowClickListener() {
						public void onInfoWindowClick() {
							LatLng llNew = new LatLng(ll.latitude + 0.005,
									ll.longitude + 0.005);
							marker.setPosition(llNew);
							mBaiduMap.hideInfoWindow();
						}
					};
				} else if (marker == mMarkerB) {
					button.setText("更改图标");
					listener = new OnInfoWindowClickListener() {
						public void onInfoWindowClick() {
							marker.setIcon(bd);
							mBaiduMap.hideInfoWindow();
						}
					};
				} else if (marker == mMarkerC) {
					button.setText("删除");
					listener = new OnInfoWindowClickListener() {
						public void onInfoWindowClick() {
							marker.remove();
							mBaiduMap.hideInfoWindow();
						}
					};
				}
				mInfoWindow = new InfoWindow(button, llInfo, listener);
				mBaiduMap.showInfoWindow(mInfoWindow);
				return true;
			}
		});
	}

	public void initOverlay() {
		// add marker overlay
		LatLng llA = new LatLng(39.963175, 116.400244);
		LatLng llB = new LatLng(39.942821, 116.369199);
		LatLng llC = new LatLng(39.939723, 116.425541);
		LatLng llD = new LatLng(39.906965, 116.401394);

		OverlayOptions ooA = new MarkerOptions().position(llA).icon(bdA)
				.zIndex(9);
		mMarkerA = (Marker) (mBaiduMap.addOverlay(ooA));
		OverlayOptions ooB = new MarkerOptions().position(llB).icon(bdB)
				.zIndex(5);
		mMarkerB = (Marker) (mBaiduMap.addOverlay(ooB));
		OverlayOptions ooC = new MarkerOptions().position(llC).icon(bdC)
				.perspective(false).anchor(0.5f, 0.5f).rotate(30).zIndex(7);
		mMarkerC = (Marker) (mBaiduMap.addOverlay(ooC));
		OverlayOptions ooD = new MarkerOptions().position(llD).icon(bdD)
				.perspective(false).zIndex(7);
		mMarkerD = (Marker) (mBaiduMap.addOverlay(ooD));

		// add ground overlay
		LatLng southwest = new LatLng(39.92235, 116.380338);
		LatLng northeast = new LatLng(39.947246, 116.414977);
		LatLngBounds bounds = new LatLngBounds.Builder().include(northeast)
				.include(southwest).build();

		OverlayOptions ooGround = new GroundOverlayOptions()
				.positionFromBounds(bounds).image(bdGround).transparency(0.8f);
		mBaiduMap.addOverlay(ooGround);

		MapStatusUpdate u = MapStatusUpdateFactory
				.newLatLng(bounds.getCenter());
		mBaiduMap.setMapStatus(u);
	}

	/**
	 * 清除所有Overlay
	 * 
	 * @param view
	 */
	public void clearOverlay(View view) {
		mBaiduMap.clear();
	}

	/**
	 * 重新添加Overlay
	 * 
	 * @param view
	 */
	public void resetOverlay(View view) {
		clearOverlay(null);
		initOverlay();
	}

	@Override
	protected void onPause() {
		// MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
		mMapView.onPause();
		super.onPause();
	}

	@Override
	protected void onResume() {
		// MapView的生命周期与Activity同步，当activity恢复时需调用MapView.onResume()
		mMapView.onResume();
		super.onResume();
	}

	@Override
	protected void onDestroy() {
		// MapView的生命周期与Activity同步，当activity销毁时需调用MapView.destroy()
		mMapView.onDestroy();
		super.onDestroy();
		// 回收 bitmap 资源
		bdA.recycle();
		bdB.recycle();
		bdC.recycle();
		bdD.recycle();
		bd.recycle();
		bdGround.recycle();
	}

}