Android : Location/maps - Speed - Delete Overlay Without Deleting All The Others
Oct 26, 2010
I'm messing around with maps and gps and i have some questions. Hope any of you point me in the right direction:
- I´m loading about 400 overlays in a mapview, but it takes 2-3 minutes. Is there any way to speed things up?
- On the other hand, I use another overlay to point device gps position, but when location point change i need to delete this overlay to put it again in it's new position. How can i delete this overlay without deleting all the others?
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Mar 4, 2010
I want to override the method enableMyLocation() in MyLocationOverlay class, in order to implement my own positioning algorithm to get latitude/longitude, and then plot them onto a MapView. I figured out how to do that, but now I'm stuck because I dont know what Canvas to pass when I call the method drawMyLocation().
Here is the MyLocationOverlay class
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Mar 15, 2010
I am building a MapView and I want my custom overlay items to display the name of the location they are marking when the user taps them, like the Android Maps app. I setup the onTap listener and the floating TextView to hold the location name. I still need to set it up so that it redraws the label when the user moves the map, etc. Anyway, I am wondering if I am reinventing the wheel here. Is there a built-in method I am unaware of? I would think that most implementations of MapView have labels. For reference, my implementation so far: in map xml:
<LinearLayout android:id="@+id/mapBubbleWrap" android:layout_width="wrap_content"
andoid:layout_height="wrap_content" android:layout_alignParentTop="true">
<TextView android:id="@+id/mapBubble" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:visibility="gone"
android:background="#ffffff" android:textColor="#ff0000"/>
</LinearLayout>
in my extended ItemizedOverlay:
public boolean onTap(int index) { this.setFocus( mOverlays.get(index) ); return true; }
in my Activity onFocus:
public void onFocusChanged( ItemizedOverlay overlay, OverlayItem item ) {
if( item != null) { mapBubble.setText(item.getTitle());
Point newPoint = mapView.getProjection().toPixels(item.getPoint(), null);
mapBubbleWrap.setPadding(newPoint.x, newPoint.y-10, 0, 0);
mapBubble.setVisibility(View.VISIBLE); } }
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Jul 22, 2010
I am trying to create a map application and I need to do something similar to what Google Maps does. I want to open show a list of locations and when user taps on them I want to show a dialog.
I was able to do it till here. But now when the user clicks on the dialog that opened I want to show another acttivity with the details of that item that they clicked on.
I tried to start a new intent but it gives me an error.
Here is what I am doing
CODE:...................
Here is the stack trace E/AndroidRuntime( 4985): java.lang.RuntimeException:
Unable to start activity ComponentInfo{com.achie.test.mapssample/ com.achie.test.mapssample.ItemDetailView}:
CODE:........
Why am I getting this error and how can I resolve this and open a new activity?
Also where can I find the source code for the google maps on android?
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Aug 18, 2010
I am trying to see if anyone knows if it is possible to change the update time of MyLocationOverlay (http://bit .ly /dBIVdj). I have tried subclassing MyLocationOverlay and implementing my own location manager but when that happens I do not see the overlay on the map. I would try overriding the drawMyLocation method however I don't know which canvas to provide the method (since I would be drawing onLocationChange). To summarize, I am looking to do three things in MyLocationOverlay subclass:
1. Change the location update times to whatever I want.
2. Draw the "my location" dot with the radius when the onLocationChanged() method is called.
I've thought about making my own special class with special overlay -- but I feel like there has to be a better method to get what I want out of this class.
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Aug 24, 2010
I want to use my image to replace the Compass image of MyLocationOverlay, how can i implement?
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Aug 11, 2010
I am trying to implement the MyLocationOverlay class from google maps. However, when I try and use my own locationManager -- I cannot get the overlay to acutally draw on the map. I am wondering if I am doing something wrong.
I don't want to call the super method(enbaleMyLocation) of the MyLocationOverlay class because that request updates from the locationManager way too quickly and will eat my battery alive.
Here is my code...
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Jun 15, 2009
I would like to put a bunch of dots on a google map, and have the appropriate listener called when one of them gets clicked.All i seem to be able to find is to get the location at which the click occurred, and then iterate through the dots until I find one that I think matches. Is there no listener for an arbitrary shape, like a drawable? I feel like this might be a Java question more so than android, but hopefully someone can still answer it.
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Jun 8, 2010
I have a weather image I would like to use as an overlay in the google maps android api. I would like to achieve the same result that I get from using GroundOverlay in KML files, such as
<GroundOverlay>
<name>myimage</name>
<Icon>
<href>myimage.png</href>
<viewBoundScale>0.75</viewBoundScale>
</Icon>
<LatLonBox>
<north>75.6088</north>
<south>5.0121</south>
<east>182.2805</east>
<west>120.6795</west>
</LatLonBox>
/GroundOverlay>
The above will ensure that the 4 corners of my image stay anchored to the 4 lat/long points listed, regardless of scrolling, zooming etc. Is there a way to accomplish this using the google api / maps provided for android?
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Jul 20, 2010
I can draw overlay items onto google maps just fine, an image that looks like:
_____
| |
______
/
Where the "/" part is the "pin" that marks the lat/lon on the map and a picture in the middle of it. My question is, is there any way to expand this when the user clicks on it? I'll of course have to change this to some kind of dialog or layout and change it when it gets clicked.
I want to have it smaller like that with just an image when not clicked on, but when it is clicked on it expands over like a second to:
--------------------------------------
| <image> <buttons> |
| <buttons> |
| <some info here> |
| |
--------------------------------------
/
Is this possible?
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Nov 3, 2010
I am using these three lines to add a compass on the MapView: mMyLocationOverlay = new MyLocationOverlay (this,mapView);mMyLocationOverlay. enableCompass(); mapView.getOverlays() .add(mMyLocation Overlay) ; However the default position of the compass showing on the screen is not too good for my apps, and I want to move it to somewhere else. Anyone knows how I can achieve that?
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Aug 28, 2010
I can't figure out how to tell my Map to redraw its overlays once I've updated them. Currently the user has to touch the screen before the map is redrawn.
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Nov 4, 2010
I've been stuck for ages now trying to implement threading or background image loading for a custom tile overlay class I've been working on. I'm pretty useless when it comes to Java so threading isn't something I've had any experience with. Basically I have extended an ItemizedOverlay and in the draw() method calculate the tiles I need to display over the standard google tiles then fetch those images with a URLConnection and using BitmapFactory decode them and draw them to the canvas at the correct position on the screen so that the images are on top of the google tiles with about 50% opacity (the custom tiles are cellphone network coverage png's which are used for our web app). I initially got this all working with the tiles loading in the correct places but hit issues with memory and "freezing" while panning so implemented some basic caching and memory management to only store the tiles that are displayed on the map in memory and when downloading a tile store it to SD card.
Then I figured the freezing while panning is due to the blocking nature of downloading the images so, have been trying to implement threading. I created a class that extends AsyncTask to download the images in the background and store them to SD, in the onPostExecute method I then try to draw all the tiles. But onPostExecute never seems to fire, now I know that the AsyncTask has to be called in the main ui thread so tried to debug the execution with Thread.currentThread().getId() calls through out the code. The thread Ids through out is 1 and then 10 for the doInBackground method for the AsyncTask. Now I'm not sure if 1 is the main UI thread or not. In the extended MapActivity class I have, the onCreate method's Thread.currentThread().getId() returns 1 but I'm not sure if the MapActivity class is executed in the main ui thread? Here Romain Guy mentions that the onPostExecute method should have @Override but when I do that eclipse flags it as an error
"The method onPostExecute(Boolean...) of type TileCache.ImageLoadTask must override or implement a supertype method"
So I guess something is wrong there but the only fix eclipse offers is to remove the @Override
So I guess with out post all my source code, the question's I have are:
Is the MapActivity onCreate method called in the main ui thread?
What does the @Override error mean? or why does it show that error
Does anyone have an example of a custom tile overlay implementation with background image loading and tile caching?
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Jan 19, 2010
Trying to make an google maps overlay in an android program. Inside of my overlay's draw method, I have two ways of adding a pin. One of them works, and one does not. Unfortunately, the one that does not work is also the only one that has the ability to add a shadow!
CODE:...........................
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Aug 30, 2010
I have an activity that has a button which opens a new MapActivity to select a location by tapping on the map.
The map has an overlay that overrides the onTap method to get the location but I want to return that location to the previous activity but, I don't know how to return the geopoint to the mapactivity in order to call the setResult() and finish() methods, because I can't call them from the Overlay.onTap method.
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Feb 5, 2010
I am looking for a way to overlay a route in google maps.
What I want is to take this map Greenways Oak Ridge Google map and get it to my google My Maps. Then I can pull it up in Maps and use my location to see where I am in relation to where I need to be in case I want to take a different route to need to shorted the ride due to darkness.
Most rides I do I can find these maps but cant do anything with them.
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Oct 29, 2010
I've been looking for a good application that has a real time speed limit for roads, as I live in a place where they don't exactly like to put up many speed limit signs. Does anyone know of one that is GPS enabled, and tracks the speed limit by your gps location? This may be impossible, but I am just wondering if anyone has stumbled across an application similar to this. Does not need to be fancy, just work.
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May 5, 2010
Could anyone help me with my below program. I'm unable to put a transparent label containing the contents from my HelloGoogleMaps.java class (Hola, Mundo!) when i click the markers(the android icon) in the map. I would like to have the ontap event do it for different markers here so that that particular location details is popped up. It needs to be in a canvas display. Upon clicking this new canvas label, it should take me to a seperate activity displaying complete details. I'm using the sample program given in the Google Android Website http://developer.android.com/resources/tutorials/views/hello-mapview and i want to extended it to the next level. Import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.OverlayItem; import android.app.Activity; import android.graphics.drawable.Drawable; import android.os.Bundle;
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Aug 18, 2010
I like tu use the MapActivity to display some pins. When a pin is pressed i like to open a description. This can I obtain following the tutorial: http://developer.android.com /resources /tutorials/views/hello-mapview. But now I like to put a button on the overlay window. That button should open a detail activity. How can I make this? How is possible to personalize the overlay "info window"?
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May 30, 2012
What's a good free app that lets me track another phone's location and speed remotely? Yes, it is for parental concern, and there is full disclosure to all parties of its existence..
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Jul 15, 2010
Anybody else see that they have the speed in MPH at the top of your map. This is one feature I have been hoping they would add to Google maps for a long time. Is this a Droid X feature only?
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Jul 21, 2010
How can I delete my emails on my gmail account on my phone without deleting them on my inbox on my computer If i close the background data it does not notify me of incoming mail. I have to refresh to check for messages.
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Jun 7, 2010
I was wondering if anyone would know how to delete the *2 Speed Dial thats already pre selected as #2.
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Jun 2, 2009
In my activities onCreate method I start listening for location updates as follows: locationManager. requestLocationUpdates(bestProvider, 5000, 0, myLocationListener); Previously I used 60,000 ms instead of 5,000 ms. The problem is that I have trouble getting the first update.public void onLocationChanged(Location location){ if (location != null){ lastlocation = location;
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Jul 1, 2010
Anyone having issues with Google Maps? Stuck on looking for the location.
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Jan 17, 2010
I have one problem with Google Maps, while opening them at some location. How could that be possible for user to specify city first (e.g. type in EditText field "London") then press a button and see London on the map? I've succeded in opening GMaps at some pre- specified location, but only using coordinates. Cannot find anything on topic.
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Aug 28, 2010
I've been working on an application lately that is using GMaps to display a location that is stored in the devices database. However when no location is available (no GPS signal is available) the user can go through an edit wizard and at a certain point he can add a location himself. I already have to code to display the stored location, but is it possible to write something so the user get's to see a map and when he clicks/touches on a certain area a map pointer appears and the location is stored. Is that possible in any way? Is there any good online documentation available? I searched through this group and on Google but couldn't find anything usefull.
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May 31, 2010
I'm having trouble trying to find a way to guide a user from one point on a map to another. I can add the locations I want to the overlay. I want the user to be able to pick a location and be guided through the streets to that location. Does anyone know how to do this, or is it even available in the API?
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May 4, 2010
Is there any way I can delete exchange emails from my Incredible without deleting them from the server? Still would like to be able to access messages from my laptop at a later time like I could with the pos Storm.
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Nov 10, 2009
How do you delete unwanted widgets without deleting the app?
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