java - Why Does Map Marker Lurch Around The Map -


i'm in android studio , have map fragment (com.google.android.gms.maps.supportmapfragment) has 2 markers. 1 static , called target. other tracks movements , called hunter. works problem hunter marker lurches about. have update interval set @ 15 milliseconds, @ walking speed updates once every block.

so, how add marker track location , have reasonably accurate , update in real-time? or doing wrong here?

greg

oncreate()

    setupmapifneeded();      if (mmap != null) {         latlng target = new latlng(targetlat, targetlong);         mmap.movecamera(cameraupdatefactory.newlatlngzoom(target, 15));     }       locationmanager locationmanager = (locationmanager) this.getsystemservice(this.location_service);      locationlistener locationlistener = new locationlistener() {         public void onlocationchanged(location location) {             makeuseofnewlocation(location);         }          public void onstatuschanged(string provider, int status, bundle extras) {}          public void onproviderenabled(string provider) {             registerforupdates();         }          public void onproviderdisabled(string provider) {             deregisterforupdates();         }     };      locationmanager.requestlocationupdates(locationmanager.network_provider, 0, 0, locationlistener);   private void registerforupdates() {     _locationmanager.requestlocationupdates(locationmanager.gps_provider, gps_frequency_millis, 0, _locationlistener); }

update marker when location changes. when close target, vibrate , change text.

    private void makeuseofnewlocation(location loc) {     hunterlat = loc.getlatitude();     hunterlong = loc.getlongitude();      if (hunter != null) {         latlng newloc = new latlng(hunterlat, hunterlong);         hunter.setposition(newloc);          textview txtitem = (textview) findviewbyid(r.id.itemname);          if (hunterlong > targetlong - .0007 && hunterlong < targetlong + .0007 && hunterlat > targetlat - .0007 && hunterlat < targetlat + .0007) {             txtitem.settextcolor(color.magenta);             txtitem.settext(itemname);             if (!vibrated){                 vibrated = true;                 vibrator v = (vibrator) this.getsystemservice(context.vibrator_service);                 v.vibrate(500);             }         }         else {             txtitem.settextcolor(color.black);             txtitem.settext(getresources().getstring(r.string.hunt_item));         }     }     else {         hunter = mmap.addmarker(new markeroptions().position(new latlng(hunterlat, hunterlong)).title("you"));         bitmapdescriptor icon2 = bitmapdescriptorfactory.fromresource(r.drawable.ic_map_person);         hunter.seticon(icon2);      } }

set map , add static target marker

   private void setupmapifneeded() {     // null check confirm have not instantiated map.     if (mmap == null) {         // try obtain map supportmapfragment.         mmap = ((supportmapfragment) getsupportfragmentmanager().findfragmentbyid(r.id.map))                 .getmap();         // check if successful in obtaining map.         if (mmap != null) {             setupmap();         }     } }  private void setupmap() {     marker target = mmap.addmarker(new markeroptions().position(new latlng(targetlat, targetlong)).title(location));     bitmapdescriptor icon = bitmapdescriptorfactory.fromresource(r.drawable.ic_target);     target.seticon(icon); }

after seeing other question, looks non-map activity getting onproviderenabled() callback, map activity not getting (unless gps radio enabled during use of map activity).

instead of calling registerforupdates() in onproviderenabled() callback, call in oncreate() if gps radio enabled, , fall-back network location if gps disabled , network location enabled.

something this:

    locationmanager locationmanager = (locationmanager) this.getsystemservice(this.location_service);     if (locationmanager.isproviderenabled(locationmanager.gps_provider)) {         registerforupdates();     }     else if (locationmanager.isproviderenabled(locationmanager.network_provider)) {         locationmanager.requestlocationupdates(locationmanager.network_provider, 0, 0, locationlistener);     }

another thing note should unregister location callbacks in onpause() override activities request location updates, don't have unnecessary battery drain caused app.


Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more