android - Get total distance travelled using GPS doesn't update my location -
hi i'm learning gps development in android. i've read basics through vogellas blog here. latitude , longitude , displayed on device don't know why doesn't update location though set runnable thread fetch location every 3 seconds. same reason why can't check if got correct formula total distance i've travelled.
this first time working maybe can give me tip or idea on how to.
i created repository in github maybe can me this. see file here :)
edit: okay main problem onchangelocation() seems doesn't work on end. tried create runnable display location every 3 seconds doesn't return result expected.
did missed out on here?
here's code far easier viewing:
main.java
import android.app.alertdialog; import android.content.context; import android.content.dialoginterface; import android.content.intent; import android.location.criteria; import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.app.activity; import android.provider.settings; import android.view.menu; import android.view.view; import android.widget.button; import android.widget.textview; import android.widget.toast; /*created kahel 08/16/2013 * read more location manager go here: http://www.vogella.com/articles/androidlocationapi/article.html * * */ public class main extends activity implements locationlistener { private textview latitude, longitude, distance; private button getlocation; private locationmanager locationmanager; private string provider; double distance_travelled; double latitude_prev; double longitude_prev; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); latitude = (textview)findviewbyid(r.id.txt_latitude); longitude = (textview)findviewbyid(r.id.txt_longitude); distance = (textview) findviewbyid(r.id.txt_distance); getlocation = (button)findviewbyid(r.id.btn_getlocation); checkgps(); getcurrentlocation(); getlocation.setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { locatorrunner(); } }); } private void locatorrunner(){ thread thread = new thread() { @override public void run() { try { while(true) { sleep(3000); runonuithread(new runnable() { @override public void run() { /*needs ui thread*/ getcurrentlocation(); } }); } } catch (interruptedexception e) { e.printstacktrace(); } } }; thread.start(); } private void getcurrentlocation(){ // location manager locationmanager = (locationmanager) getsystemservice(context.location_service); // define criteria how select locatioin provider -> use // default criteria criteria = new criteria(); provider = locationmanager.getbestprovider(criteria, false); location location = locationmanager.getlastknownlocation(provider); toast.maketext(main.this,string.valueof(location),toast.length_short).show(); //locationmanager.requestlocationupdates(locationmanager.gps_provider,1000l,500.0f, (locationlistener) location); // initialize location fields if (location != null) { system.out.println("provider " + provider + " has been selected."); onlocationchanged(location); } else { latitude.settext("location not available"); longitude.settext("location not available"); distance.settext("0"); } } private void checkgps(){ locationmanager service = (locationmanager) getsystemservice(location_service); boolean enabled = service.isproviderenabled(locationmanager.gps_provider); toast.maketext(main.this,string.valueof(enabled),toast.length_short).show(); // check if enabled , if not send user gsp settings // better solution display dialog , suggesting // go settings if (!enabled) { showgpssettingdialog(); } } private void showgpssettingdialog(){ /*create dialog tell user enable gps settings pinpoint or location*/ alertdialog.builder alertdialog = new alertdialog.builder(main.this); alertdialog.settitle("settings para sa lokasyon"); /*should on string values*/ alertdialog .setmessage("kasalukuyang hindi aktibo ang iyong gps para makuha ang iyong lokasyon. nais mo bang i-set ito ngayon?") .setcancelable(false) .setpositivebutton("oo", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialoginterface, int i) { intent intent = new intent(settings.action_location_source_settings); startactivity(intent); } }) .setnegativebutton("hindi", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialoginterface, int i) { dialoginterface.cancel(); } }); alertdialog gpssettingsdialog = alertdialog.create(); gpssettingsdialog.show(); } /* request updates @ startup */ @override protected void onresume() { super.onresume(); locationmanager.requestlocationupdates(provider, 400, 1, this); } /* remove locationlistener updates when activity paused */ @override protected void onpause() { super.onpause(); locationmanager.removeupdates(this); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.main, menu); return true; } @override public void onlocationchanged(location location) { getlocation(location); } private void getlocation(location location){ int r = 6371; double lat = location.getlatitude(); double lon = location.getlongitude(); latitude_prev = lat; longitude_prev = lon; double dlat = latitude_prev - lat; double dlon = longitude_prev - lon; double = math.sin(dlat / 2) * math.sin(dlat / 2) + math.cos(latitude_prev) * math.cos(lat) * math.sin(dlon / 2) * math.sin(dlon / 2); double c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a)); distance_travelled = r * c; latitude.settext(string.valueof(lat)); longitude.settext(string.valueof(lon)); distance.settext(string.valueof(distance_travelled)); } /*private double torad(double d) { return d * math.pi / 180; }*/ @override public void onstatuschanged(string s, int i, bundle bundle) { } @override public void onproviderenabled(string s) { toast.maketext(this, "enabled new provider " + provider,toast.length_short).show(); } @override public void onproviderdisabled(string s) { toast.maketext(this, "disabled provider " + provider,toast.length_short).show(); } } main.xml
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <linearlayout android:id="@+id/linearlayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margintop="40dip" android:orientation="horizontal" > <textview android:id="@+id/textview01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="10dip" android:layout_marginright="5dip" android:text="latitude: " android:textsize="20dip" > </textview> <textview android:id="@+id/txt_latitude" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="unknown" android:textsize="20dip" > </textview> </linearlayout> <linearlayout android:id="@+id/linearlayout2" android:layout_width="match_parent" android:layout_height="wrap_content" > <textview android:id="@+id/textview03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="10dip" android:layout_marginright="5dip" android:text="longitute: " android:textsize="20dip" > </textview> <textview android:id="@+id/txt_longitude" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="unknown" android:textsize="20dip" > </textview> </linearlayout> <linearlayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:textappearance="?android:attr/textappearancemedium" android:text="distance travelled:" android:id="@+id/textview" android:layout_gravity="left|center_vertical" android:layout_marginleft="10dp" android:layout_marginright="5dp"/> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:textappearance="?android:attr/textappearancemedium" android:text="unknown" android:id="@+id/txt_distance"/> </linearlayout> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="get location" android:id="@+id/btn_getlocation" android:layout_gravity="center"/> </linearlayout> androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.geolocation" android:versioncode="1" android:versionname="1.0" > <uses-permission android:name="android.permission.access_fine_location" /> <uses-permission android:name="android.permission.access_coarse_location " /> <uses-permission android:name="android.permission.internet" /> <uses-sdk android:minsdkversion="7" android:targetsdkversion="10" /> <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/apptheme" > <activity android:name="com.example.geolocation.main" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> </application> </manifest> note:
i added button start tracking because i'm not sure if onlocationchanged working or not. hahaha!
basic approach distance:
public class test extends activity implements locationlistener{ private locationmanager lm; private location last; private long distance; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); lm = (locationmanager) getsystemservice(location_service); } @override protected void onresume() { super.onresume(); lm.requestlocationupdates(locationmanager.gps_provider,1000,1,this); } @override protected void onpause() { super.onpause(); lm.removeupdates(this); } @override public void onlocationchanged(location location) { if(last != null){ distance += location.distanceto(last); } last = new location(location); } @override public void onstatuschanged(string s, int i, bundle bundle) { } @override public void onproviderenabled(string s) { } @override public void onproviderdisabled(string s) { } }
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