Description of multiple covers on the three hundred-degree map of Baidu Map

(According to the old Luo video) How to mark multiple buildings on a map as a certain type of covering, you can use the itemizedoverlay class to process multiple items with the same type, display method, and processing method. Itemizedoverlay is an abstract class that is a subclass of overlay and contains an overlayitem list. Processing items from south to north are used to draw, create a translation boundary, draw a tag point for each vertex, and maintain a focal point selected item, it is also responsible for matching a screen click to an item and distributing the focus change event to the alternative listener. Draw (...): draws a mark point on each item. Getcenter (): by default, getlatspane6 () getlonspane6 () ONTAP (geopoint P, mapview) of the first item is returned: Click Event size () when a building is clicked (): Number of overlayitems.

Case study: add multiple buildings to a map

 

Import Java. util. arraylist; import Java. util. list; import COM. android. android_baidu_muloverlayitem.r; import COM. baidu. mapapi. bmapmanager; import COM. baidu. mapapi. geopoint; import COM. baidu. mapapi. itemizedoverlay; import COM. baidu. mapapi. mkgenerallistener; import COM. baidu. mapapi. mapactivity; import COM. baidu. mapapi. mapcontroller; import COM. baidu. mapapi. mapview; import COM. baidu. mapapi. overlayitem; Import android. graphics. drawable. drawable; import android. OS. bundle; import android. widget. toast; public class mainactivity extends mapactivity {// Add the control of Baidu map private mapview; // the engine for loading maps private bmapmanager; // key private string keystring = "Hangzhou" of Baidu map; // Add some controls on Baidu map, such as the enlarged or reduced control private mapcontroller; @ overridepublic void on Create (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); mapview = (mapview) This. findviewbyid (R. id. bmapview); bmapmanager = new bmapmanager (mainactivity. this); // The Key bmapmanager must be loaded. init (keystring, new mkgenerallistener () {public void ongetpermissionstate (INT arg0) {If (arg0 = 300) {toast. maketext (mainactivity. this, "The entered key is incorrect. Please verify it !! ", 1 ). show () ;}} public void ongetnetworkstate (INT arg0) {}}); this. initmapactivity (bmapmanager); // indicates that the zoom function mapview can be set. setbuiltinzoomcontrols (true); mapcontroller = mapview. getcontroller (); // set the zoom level to 12 mapcontrollers. setzoom (12); drawable = getresources (). getdrawable (R. drawable. icon_marka); mapview. getoverlays (). add (New myoverlayitem (drawable);} public class myoverlayitem extends it Emizedoverlay <overlayitem> {private list <overlayitem> List = new arraylist <overlayitem> (); // define a set of coordinates for the double type private double mlat1 = 39.90923; // It indicates that the latitude is private double mlon1 = 116.397428; // It indicates that the longitude is private double mlat2 = 39.9022; // It indicates that the latitude is private double mlon2 = 116.3922; // indicates the longitude private double mlat3 = 39.9033; // indicates the latitude private double mlon3 = 116.3933; // indicates the longitude // used to mark the coordinates on the map, mark public myoverlayitem (drawable Arg with an image 0) {super (arg0); // The geopoint geopoint1 = new geopoint (INT) (mlat1 * 1e6), (INT) of the first group of data on the map) (mlon1 * 1e6); // The annotation point geopoint geopoint2 = new geopoint (INT) (mlat2 * 1e6), (INT) of the second group of data on the map) (mlon2 * 1e6); // geopoint geopoint3 = new geopoint (INT) (mlat3 * 1e6), (INT) (mlon3 * 1e6); // annotation point, title, segment list. add (New overlayitem (geopoint1, "point1", "point1"); list. add (New overlayitem (geopoint2, "point2", "point2 ")); List. add (New overlayitem (geopoint3, "point3", "point3"); populate (); // implemented the map refresh function} // returns each coordinate in the specified list set @ overrideprotected overlayitem createitem (INT arg0) {return list. get (arg0);} // returns the number of coordinates in the list set @ overridepublic int size () {return list. size () ;}@ overridepublic Boolean ONTAP (int I) {toast. maketext (mainactivity. this, list. get (I ). getsnippet (), 1 ). show (); Return true ;}@overrideprotected void Ondestroy () {super. ondestroy (); If (bmapmanager! = NULL) {bmapmanager. Destroy (); bmapmanager = NULL ;}@overrideprotected void onresume () {super. onresume (); If (bmapmanager! = NULL) {bmapmanager. Start () ;}@ overrideprotected void onpause () {super. onpause (); If (bmapmanager! = NULL) {bmapmanager. Stop () ;}@ overrideprotected Boolean isroutedisplayed () {return false ;}}