java - How to tell if a Marker is in a Polygon googleMap v2 -

i've got google map polygons, i've got work except last part detect if marker inside polygon.the current situation when touch polygon add marker"which correct" if touch polygon in different spot remove marker , add new one. want happen if marker within points don't add new one. code below appreciate.

public void onmapclick(latlng point) {       (int j = 0; j < arrpolygons.size(); j++) {          if (ispointinpolygon(point, arrpolygons.get(j).getpoints())) {          if (marker != null) {                 marker.remove();                 marker = null;                 log.v("marker", "removing marker");             }else{                 marker = googlemap.addmarker(new markeroptions()                         .position(point)                         .title("test")                         .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_red)));                 log.v("marker", "adding marker");             }         }     } 

any appreciated.

the easiest way using google maps android api utility library, contains polyutil class.

first import library adding current version build.gradle, 0.3.4 example:

dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:appcompat-v7:22.1.1'     compile 'com.google.android.gms:play-services-maps:7.3.0'     compile 'com.google.maps.android:android-maps-utils:0.3.4' } 

for simple example we'll assume map activity class definition , member variables this, , 1 polygon defined in polygonlist:

import com.google.maps.android.polyutil; //other imports.....  public class mapsactivity extends appcompatactivity implements onmapreadycallback {      private googlemap mmap;     private marker marker;     list<latlng> polygonlist = new arraylist<latlng>();     //............. 

you set googlemap.onmapclicklistener in order add 1 marker inside polygon.:

  mmap.setonmapclicklistener(new googlemap.onmapclicklistener() {          @override         public void onmapclick(latlng point) {              if (polyutil.containslocation(point, polygonlist, false)) {                  if (marker == null) {                     //only add marker if there not 1 inside polygon                     marker = mmap.addmarker(new markeroptions()                             .position(point)                             .title("test")                             .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_red)));                     log.v("marker", "adding marker");                  }              }         }     }); 

multiple polygons, multiple markers solution:

in order make work multiple ploygons, use pojo store polygon/marker pairs:

public class polymarkerobject{     polygon polygon;     marker marker; } 

then define new member variable polymarkerlist:

public class mapsactivity extends appcompatactivity implements onmapreadycallback {      private googlemap mmap;     list<polymarkerobject> polymarkerlist = new arraylist<>();     //............. 

add each polygon list when drawing it:

    list<latlng> newpolygon = new arraylist<>();     //set points in polygon.......      polygon p = mmap.addpolygon(new polygonoptions()             .addall(newpolygon)             .strokecolor(color.red)             .fillcolor(color.blue));      polymarkerobject newpolymarkerobj = new polymarkerobject();     newpolymarkerobj.polygon = p;     polymarkerlist.add(newpolymarkerobj); 

then cycle through list on each map click see whether current ploygon has marker. if not have marker already, remove marker placed in different polygon, , create 1 in current polygon:

 mmap.setonmapclicklistener(new googlemap.onmapclicklistener() {          @override         public void onmapclick(latlng point) {              (polymarkerobject pmobj : polymarkerlist) {                 //only add marker if there not 1 inside polygon                 if (polyutil.containslocation(point, pmobj.polygon.getpoints(), false)) {                     if (pmobj.marker == null) {                          //add marker current polygon                         marker newmarker = mmap.addmarker(new markeroptions()                                 .position(point)                                 .title("test")                                 .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_red)));                          pmobj.marker = newmarker;                         log.v("marker", "adding marker");                         break;                     }                  }             }         }     }); 

multiple polygons, 1 marker solution:

in case, need 1 marker reference, , list of polygons:

public class mapsactivity extends appcompatactivity implements onmapreadycallback {      private googlemap mmap;     marker marker;     list<polygon> polylist = new arraylist<>();     //................ 

add polygon list when it's added map:

    list<latlng> newpolygon = new arraylist<>();     //set points in polygon.......      polygon p = mmap.addpolygon(new polygonoptions()             .addall(newpolygon)             .strokecolor(color.red)             .fillcolor(color.blue));      polylist.add(p); 

then, in map click listener, have 2 cases, 1 if marker reference null (no marker added yet), , 1 if marker in different polygon. if marker in current polygon already, not moved.

 mmap.setonmapclicklistener(new googlemap.onmapclicklistener() {          @override         public void onmapclick(latlng point) {              (polygon pobj : polylist) {                 //find polygon user tapped inside of                 if (polyutil.containslocation(point, pobj.getpoints(), false)) {                     //first case, no marker                     if (marker == null) {                          //add marker current polygon                         marker = mmap.addmarker(new markeroptions()                                 .position(point)                                 .title("test")                                 .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_red)));                          log.v("marker", "adding first marker");                         break;                     }                     else if (!polyutil.containslocation(marker.getposition(), pobj.getpoints(), false)) {                         //marker exists in different polygon                         //remove marker previous polygon                         marker.remove();                         //add marker current polygon                         marker = mmap.addmarker(new markeroptions()                                 .position(point)                                 .title("test")                                 .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_red)));                          log.v("marker", "moving marker new polygon");                         break;                     }                  }             }         }     });