Develop Reference

Android-How to convert String value of latLng from Firebase back to latLng?

In my app, I am trying to have people mark their locations, and have it brought back through Firebase.
This is my code for grabbing the latLng:
final LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
I then send the string value of latLng to another activity so it gets sent to the databse:
Intent co_intent = new Intent(MapsActivity.this, ServerImage.class);
co_intent.putExtra("pelatlng",String.valueOf(latLng));
MapsActivity.this.startActivity(co_intent);
When I do this, the coordinates gets saved in the Database like this(fake coordinates for obvious reasons):
Markers:
coordinates: "lat/lng:(35.000000,119.0000000)"
I then got the Databse value so I could bring back the coordinates:
mDatabaseMarker=FirebaseDatabase.getInstance().getReference().child("Markers");
Now I am trying to put the saved markers through ChildEventListener like this:
refDatabase.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {
);
mMap.addMarker(new MarkerOptions()
.position(?)
}
However, I don't know what to put for the marker position.
I could get the value back as a String just fine, but having trouble putting the marker on that location. Thanks for the help.

Initially Split values inside brackets as below:
String example = "lat/lng:(35.000000,119.0000000)";
Matcher m = Pattern.compile("\\(([^)]+)\\)").matcher(example);
while(m.find()) {
from_lat_lng = m.group(1) ;
}
Once you have String with lat,lon Split it and parse it to double.
String[] gpsVal = from_lat_lng.split(",");
double lat = Double.parseDouble(gpsVal[0]);
double lon = Double.parseDouble(gpsVal[1]);
After this you can use lat,lon in your marker as below:
Marker a = gMap.addMarker(new MarkerOptions().zIndex(100)
.position(new LatLng(lat,lon))

How to use Latitud and Longitud as a variable in Android?

I have an SQLITE3 database where I defined lat and long as text.
I need to use those lat, and long as the final destination in a map.
The intent is defined as:
if(locationMap != null){
Intent theIntent = new Intent(getApplication(), displayMap.class);
theIntent.putExtra("_Id", locationMap.get("_Id"));
theIntent.putExtra("locCode", locationMap.get("locCode"));
theIntent.putExtra("locDesc", locationMap.get("locDesc"));
theIntent.putExtra("locLat", locationMap.get("locLat"));
theIntent.putExtra("locLong", locationMap.get("locLong"));
theIntent.putExtra("locTelephone", locationMap.get("locTelephone"));
theIntent.putExtra("locComments", locationMap.get("locComments"));
startActivity(theIntent); // display map with coordinates
}
In the next activity I recover the values in the On create method:
// Parameters
String locCode = i.getStringExtra("locCode");
String locDesc = i.getStringExtra("locDesc");
String locLat = i.getStringExtra("locLat");
String locLong = i.getStringExtra("locLong");
String locTelephone = i.getStringExtra("locTelephone");
String locComments = i.getStringExtra("locComments");
String Text = "Current location is: " +
i.getStringExtra("locLat");
Toast.makeText( getApplicationContext(),Text,
Toast.LENGTH_SHORT).show();
System.out.println("locCode: " + locCode);
System.out.println("LocDesc: " + locDesc);
System.out.println("LocLat: " + locLat);
System.out.println("LocLong: " + locLong);
System.out.println("LocTelephone: " + locTelephone);
System.out.println("LocComment: " + locComments);
getLocation(ORIGIN);
setContentView(R.layout.map);
if (mLastSelectedMarker != null && mLastSelectedMarker.isInfoWindowShown()) {
// Refresh the info window when the info window's content has changed.
mLastSelectedMarker.showInfoWindow();
}
setUpMapIfNeeded();
}
I need to use those locLat and Loclong instead of the numbers:
public class displayMap extends FragmentActivity implements
OnMarkerClickListener,
OnInfoWindowClickListener {
public LatLng ORIGIN = new LatLng(34.02143074239393, -117.61349469423294);
public LatLng DESTINY = new LatLng(34.022365269080886, -117.61271852999926);
private GoogleMap mMap;
private Marker mDestiny;
private Marker mOrigin;
private Marker mLastSelectedMarker; // keeps track of last selected marker
I've tried transforming the text to double and It won't allow me to.
I've tried many solutions I found on stack overflow, but no luck yet.
I appreciate any help
Thanks in advance.

You need to parse the latitude and longitude from String to double to use in new LatLng();
double latitude = Double.parseDouble(locLat);
double longitude = Double.parseDouble(locLong);
and then,
public LatLng ORIGIN = new LatLng(latitude, longitude);

you need cast them into double. As GPRathour says.

Change the type of Lat Long Text to REAL in your SQL Lite,
when inserting values use this
values.put(Latitude_Column, ORIGIN.latitude);
values.put(Longitude__Column,ORIGIN.longitude);
And for retrieving values
LatLng origin = new LatLng(cursor.getDouble(cursor.getColumnIndex(Latitude_Column)),cursor.getDouble(cursor.getColumnIndex(Longitude__Column)));
No need to parsing values

Break out multiple coordinates into multiple latlng googlemap v2

I have a huge list in an XML tag like so:
<coor> -123.3858,41.34119,0
-123.3856,41.34109,0
-123.3852,41.34121,0
-123.3848,41.34139,0</coor>
and need it like this:
new LatLng(-123.3858,41.34119),
new LatLng(-123.3856,41.34109),
new LatLng(-123.3852,41.34121),
new LatLng(-123.3848,41.34139),
to work with google maps v2 android.
I've done a string replace on the coordinates and am getting the correct results like so:
String ll = "),new LatLng(";
coor = coor.replaceAll(",0", ll);
replacing the ,0 for the new LatLng(... I am not figuring out how to change the large string of latlng text into latlng locations to put into my polygon:
PolygonOptions perimeteres = new PolygonOptions().add(coor);
Is there way to do this? Or do I need to separate each out and make them individual latlng?
EDIT::::
String[] splitData = coor.split(",0");
for (String eachSplit : splitData) {
if (!eachSplit.endsWith(",0")) {
//Log.e("EACH",eachSplit);
Log.v("e","new LatLon("+eachSplit+");");
}
}
This is getting me a little closer...

You are going completely in the wrong direction, this
String ll = "),new LatLng(";
coor = coor.replaceAll(",0", ll);
is not the same as
new LatLng(-123.3858,41.34119)
the first gives you a string which does nothing for you, the second is an object which is what you need.
Edit
you need to remove the 0 from the coordinates then you do a string split on the , so you have an array of latitudes and longitudes.
then create a List<LatLng> which is what you need to create a polygon of points
and loop through your points
for(int j=0;j<locationAry.length;j++){
if(j%2 == 0){
lon = Float.parseFloat(locationAry[j+1]);
lat = Float.parseFloat(locationAry[j]);
}
}

Converting String to Double for use in LatLng/Google Maps

I need to convert a String value into a LatLng value for use in a GoogleMaps fragment in an Android app. The string value will likely come in the form of "-45.654765, 65.432892".
I've tried two different ways of doing this, and both have resulted in errors. First, I've tried using split() and putting the results into a String[], then accessing each using parseDouble(), as follows:
String[] geo = GEO.split(",");
double lati = Double.parseDouble(geo[0]);
double lngi = Double.parseDouble(geo[1]);
LOCATION = new LatLng(lati, lngi);
This yields an ArrayIndexOutOfBoundsException caused by double lati = Double.parseDouble(geo[0]);. I'm not really sure why.
I've also tried using StringTokenizer, as follows:
StringTokenizer tokens = new StringTokenizer(GEO, ",");
String lat = tokens.nextToken();
String lng = tokens.nextToken();
double lati = Double.parseDouble(lat);
double lngi = Double.parseDouble(lng);
LOCATION = new LatLng(lati, lngi);
This yields a NoSuchElementException pointing to String lng = tokens.nextToken();.
In both cases, the String I am working on, GEO, is public static final and passed from another activity via intent, where it is currently just hardcoded as "43.75,-70.15".
LOCATION is public static and is a LatLng variable initialized as null.
Can anyone point me in the right direction? This seems really simple so I'm even more confused than usual...
EDIT:
The data originates in a different activity where it is passed via intent. The activity that receives the intent has GEO defined as follows:
public static final String GEO = "geo";
And the intent from the previous activity puts geo in like this:
bundle.putString(PlaceActivity.GEO, geo);

You should have
String loc = getIntent().getExtras().getString(PlaceActivity.GEO);
String[] geo = loc.split(",");

You could just use a very basic substring:
int index = GEO.indexOf(",");
String lat = GEO.substring(0, index).trim();
String lng = GEO.substring(index+1).trim();
double lati = Double.parseDouble(lat);
double lngi = Double.parseDouble(lng);
LOCATION = new LatLng(lati, lngi);
Sorry, untested.

Converting a string to an int for an Android Geopoint

I'm getting latitude and longitude as strings from a Google Places URL. Now I'd like to place a pin on a map using the obtained coordinates. Something is goofy because I'm trying to parse the strings into integers for the GeoPoint, and the results show as 0,0 so the pin is placed off the coast of Africa. Here's my code:
int lati5Int, longi5Int;
String latiString = in.getStringExtra(TAG_GEOMETRY_LOCATION_LAT);
String longiString = in.getStringExtra(TAG_GEOMETRY_LOCATION_LNG);
TextView getLatiStringtv.setText(latiString);
TextView getLongiStringtv.setText(longiString);
try {
lati5Int = Integer.parseInt(getLatiStringtv.getText().toString());
longi5Int = Integer.parseInt(getLongiStringtv.getText().toString());
} catch(NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
// shows that the ints are zeros
doubleLatiTV.setText(Integer.toString(lati5Int));
doubleLongiTV.setText(Integer.toString(longi5Int));
//--- GeoPoint---
newPoint = new GeoPoint(lati5Int,longi5Int);
mapController.animateTo(newPoint);
mapController.setZoom(17);
//--- Place pin ----
marker = getResources().getDrawable(R.drawable.malls);
OverlayItem overlaypoint = new OverlayItem(newPoint, "Boing", "Whattsup");
CustomPinpoint customPin = new CustomPinpoint(marker, SMIMap.this);
customPin.insertPinpoint(overlaypoint);
overlayList.add(customPin);
I think the error is in the parsing of the integers:
lati5Int = Integer.parseInt(getLatiStringtv.getText().toString());
longi5Int = Integer.parseInt(getLongiStringtv.getText().toString());
I think the parsing sees the decimal point in the coordinates and freaks out. So how can I parse the coordinate strings into integers so that the GeoPoint will see them as correctly formatted coordinates like: 30.487263, -97.970799

GeoPoint doesn't want to see them as 30.487263, -97.970799. It wants them as the integers 30487263, -97970799. So like A.A said, parse as double first, multiply by E6, then cast to int.
So maybe something like:
lati5Int = Double.parseDouble(getLatiStringtv.getText().toString());
latiE6 = (int) (lati5Int*1000000);