Android学习笔记之百度地图（分条目覆盖物：ItemizedOverlay）

package xiaosi.baiduMap; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.Toast; import com.baidu.mapapi.BMapManager; import com.baidu.mapapi.GeoPoint; import com.baidu.mapapi.ItemizedOverlay; import com.baidu.mapapi.MapActivity; import com.baidu.mapapi.MapController; import com.baidu.mapapi.MapView; import com.baidu.mapapi.OverlayItem; public class BaiduMapActivity extends MapActivity { /** Called when the activity is first created. */ private BMapManager mapManager = null; private String key = "1B79478DA01F7800AEA8602517A6D89B38151105"; private MapView mapView = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mapManager = new BMapManager(getApplication()); mapManager.init(key, null); super.initMapActivity(mapManager); mapView = (MapView) findViewById(R.id.mapsView); mapView.setBuiltInZoomControls(true); // 设置启用内置的缩放控件 MapController mapController = mapView.getController(); // 得到mMapView的控制权,可以用它控制和驱动平移和缩放 mapController.setZoom(12); // 设置地图zoom级别 Drawable marker = getResources().getDrawable(R.drawable.d); //得到需要标在地图上的资源 mapView.getOverlays().add(new OverItemT(marker, this)); //添加ItemizedOverlay实例到mMapView } class OverItemT extends ItemizedOverlay<OverlayItem> { private List<OverlayItem> GeoPointList = new ArrayList<OverlayItem>(); private Context mContext; //三个坐标 private double coordinateX1= 39.90923; private double coordinateY1 = 116.397428; private double coordinateX2 = 39.9022; private double coordinateY2 = 116.3922; private double coordinateX3 = 39.917723; private double coordinateY3 = 116.3722; private double coordinateX4 = 39.90923; private double coordinateY4 = 116.3922; public OverItemT(Drawable marker, Context context) { //调整一个drawable边界，使得（0，0）是这个drawable底部最后一行中心的一个像素。 super(boundCenterBottom(marker)); this.mContext = context; // 用给定的经纬度构造GeoPoint，单位是微度 (度 * 1E6) GeoPoint point1 = new GeoPoint((int) (coordinateX1 * 1E6), (int) (coordinateY1 * 1E6)); GeoPoint point2 = new GeoPoint((int) (coordinateX2 * 1E6), (int) (coordinateY2 * 1E6)); GeoPoint point3 = new GeoPoint((int) (coordinateX3 * 1E6), (int) (coordinateY3 * 1E6)); GeoPoint point4 = new GeoPoint((int) (coordinateX4 * 1E6), (int) (coordinateY4 * 1E6)); /*OverlayItem(GeoPoint point, String title, String snippet) * point 该item的位置 * title 该item的标题文本 * snippet 该item的文字片段 */ GeoPointList.add(new OverlayItem(point1, "P1", "写字楼")); GeoPointList.add(new OverlayItem(point2, "P2", "西城区政府")); GeoPointList.add(new OverlayItem(point3, "P3", "招待所")); GeoPointList.add(new OverlayItem(point4, "P4", "小学")); // createItem(int)方法构造item。一旦有了数据，在调用其它方法前，首先调用这个方法 populate(); } @Override protected OverlayItem createItem(int i) { return GeoPointList.get(i); } @Override public int size() {System.out.println("Size；" + GeoPointList.size()); return GeoPointList.size(); } @Override // 处理当点击事件 protected boolean onTap(int i) { //getSnippet() 该item的文字片段 Toast.makeText(this.mContext, GeoPointList.get(i).getSnippet(), Toast.LENGTH_SHORT).show(); return true; } } @Override protected boolean isRouteDisplayed() { return false; } @Override protected void onDestroy() { if (mapManager != null) { mapManager.destroy(); mapManager = null; } super.onDestroy(); } @Override protected void onPause() { if (mapManager != null) { mapManager.stop(); } super.onPause(); } @Override protected void onResume() { if (mapManager != null) { mapManager.start(); } super.onResume(); } }