Android :: How To Draw 3D Objects On A MapView?

Oct 20, 2009

I have been able to draw a map using 'MapActivity' class. Am unable to render 3D graphics on the Map. Is there any way to draw something on the foreground with the Map as the background?

Android :: How to draw 3D objects on a MapView?


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Android :: How To Drag Marker Objects In A MapView?

Jun 4, 2009

Hey Is it easy/possible to drag marker objects in a MapView?

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Android :: Efficient Way To Draw Multiple Identical Objects?

Sep 26, 2010

I would like to make a game out of many cubes and am planning on putting it on mobile platforms and also on the web using webgl. My problem is when I make a drawelements call per cube I take a hit on the frame rate. Is there a way I can make a single draw call to opengl es to draw them? The only difference between the cubes would be position and color.

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Android :: Force LinearLayout To Draw Objects In More Than One Dimension?

Sep 28, 2010

I need to populate a View with a data from adapter which contains some number of strings. The problem is that I don't know how many of the strings will be there. So my idea was to use LinearLayout to store data. But even if I reserve enough space for this data (eventually I will draw it in ScrollView), LinearLayout use only horizontal perspective (drawing Strings to the end of line), and not uses additional space beyond.
My intention is to draw to the end of line, and draw next line... till end of data.

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Android :: MapView Draw Overlays

Feb 14, 2010

i have a problem with my mapView. my app reads "some" gps points out of a file and i want to draw a route (drawing lines between the gps point). If my file contains many gps points, my app works really slow. i think its working slow, because i draw all overlays. now i want to check, whether a point is visible in my mapView or not. so i have to get the mapCenter and Lat/lon span (getLatitudeSpan,..) !? how and where must i save my points and how can i check all my points (after my mapCenter has changed for example). Shall I save my points in a list (in my Overlay class??) and iterate through every list item and check, wheter its visible or not?

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Android :: Draw Text With Border On MapView?

Nov 12, 2009

I'm trying to draw some text onto an MapView on Android. The drawing of the text goes fine, but it's very hard to read the text because it's white with no black border (like the rest of the text that appears naturally on MapViews to denote cities, states, and countries). I can't seem to figure how to draw the text with a black border. This is the sort of code I'm using right now (this is just example code, found in one of my overlays):

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
Paint textPaint = new Paint();
textPaint.setARGB(255, 255, 255, 255);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setTextSize(16);
textPaint.setTypeface(Typeface.DEFAULT_BOLD);
canvas.drawText("Some Text", 100, 100, textPaint);
super.draw(canvas, mapView, shadow);}

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Android :: Problem Draw On A MapView ItemizedOverlay

Aug 27, 2010

I am developing an application for the Parisian Metro. One of the functions is a map where you can click the metro stations and see what are the metro lines, and when are the next 4 trains on this station.

I have hence created a MapActivity and an ItemizedOverlay classes.

On my device it is working perfectly, but I am getting some logs from the users with a crash, and I really don't understand what's wrong.

My map activity adds ONE ItemizedOverlay that displays a blue dot for the current user location. This overlay also listens to onTap, which depending on the coordinates of the tap, will try to find metro stations (for which I know the lat/lon coordinates). This is working perfectly.

The stack trace of the crash is:

CODE:.....................

Sometimes it comes from different lines but it always finishes crashing at OverlayBunde.java:42

As is does not mention my code, I don't know what's wrong.

You can get the source code of the MapActivity and the the ItemizedOverlay: http://code.google.com/p/metroparis/source/browse/trunk/src/org/bicou/metro/

The activity class is ACarteStations and the overlay class is StationMetroMapOverlay.

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Android :: Draw ImageView At Specific GeoPoint On MapView

Oct 1, 2010

Trying to solve my current problem of drawing an image on an Android MapView and then animate it to represent a moving object, I decided to try to just draw a raw ImageView at a GeoPoint on the map and then try and animate it from there.

This is the code I put in my map activity (extends MapActivity)'s onCreate method:

CODE:..............

Again, I'm just trying to draw the static icon and animate it from there. I can already do this with an ItemizedOverlay, but as far as I can tell, I can't animate the elements of an AnimatedOverlay the way that I can animate a view. Thus, using ImageView.

But the icon doesn't show up.

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Android :: Draw MapView - Rectangles That Automatically Re-size When User Zooms In And Out

Aug 26, 2010

My Android application has a MapView. I want to divide that MapView into a grid according to latitude and longitude, and shade the different cells of that grid different colors based upon a certain criteria. What's the simplest way to do this?

I could create semi-transparent, solid-color PNG Drawable rectangular images and put them in an ItemizedOverlay centered on the central points of the cells, but then the rectangles would grow and shrink as the user zoomed in and out on the map. I could extend MapView and override the zoom functions so that the rectangles got re-sized when the user zoomed, but that seems really complicated for something that should be simple! Please tell me a better way to do it?

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Android :: Google Maps - MapView - Draw A Nice Flight Route Between 2 Points

Aug 1, 2010

I wonder, how can I draw a nice flight route between 2 points on a google map's MapView? look at this: http://maps.forum.nu/gm_flight_path.html

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Android :: Draw Path On MapView From Large Amount Of Longitude/latitude Points

Aug 2, 2010

I am writing a application that needs to draw a "route" comprised of lots of GPS points (long+lat). The points are close together and don't follow roads, simply drawing a line between each point is ideal.

The current implementation I have is very slow as I am looping over all the GPS coordinates and creating a new Point and overlayitem in an itemized overlay. This takes around 20 seconds for it to load all of these points and draw them to the mapview. Is there a way in which I can construct a series of lines or point from the GPS coordinates and draw them onto the mapview?

Example of current implementation:

CODE:...................

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Android :: Pass Objects Around Activities Using A HashMap Of WeakReferences To Objects?

Oct 26, 2010

The FAQ mentions a method of passing objects around activities. (It is not clear to me): "A HashMap of WeakReferences to Objects. You can also use a HashMap of WeakReferences to Objects with Long keys. When an activity wants to pass an object to another activity, it simply puts the object in the map and sends the key (which is a unique Long based on a counter or time stamp) to the recipient activity via intent extras. The recipient activity retrieves the object using this key.".................

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Android :: How To Filter Objects To Display Onscreen Objects On Map?

Jun 15, 2010

I have an application that have a Google map on Google Android 1.5 since we have been working on the application for a long time, we are not in stage of upgrading to the newest framework, so we are using 1.5. Now, I have map locations that are dynamically generated and drawn on the map at run-time to visualize some streams, Up to this point the application is working fine, Now my problem is that I am trying to filter the objects ( addresses) to visualize only the on-screen ones. I do NOT want to visualize the addresses that are off-screen. The way I am trying to do this is to check the screen-coordinates of each object (address) before visualizing it, then it the coordinates (x,y) more than (0,0) and less than (320, 460). I should visualize it. I am trying to use this approach, but it is not working for some reasons, I have tried many posts but could not understand why, there must be something missing somewhere that I am not aware of.

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Android : Save / Activity With MapView And After Reload Same Mapview?

Jul 16, 2010

I had found a lot of stackoverflow post about save an Activity and the reload it.

My question: How can I have an Activity with an MapView and after reload the same mapview?

What is the best way to switch between activity and views?

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Android :: Draw Route Path Draw Function

Sep 5, 2010

In my android application I use this method in "draw" Overlay class for draw route on map. Can someone tell me if this method is good (in terms of performance) for route draw on map or I must to put code in Thread ??
I'm new to android.

public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (pointsAndTimes.isEmpty()) {
return;
}
Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);.............

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Android :: Draw Shape Within Shape Or Draw 2 Lines Around Shape

Jun 21, 2010

I want to have a elmenent with a 2 color border outline. I can do a single color outline using the element, but this only allows me to draw a single line. I tried using 2 elements within my but that didnt work either. Is there a way to either draw a shape within a shape or draw 2 lines around my shape (which has rounded corners btw).

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Android :: How To Manage Objects ?

Sep 8, 2010

I am new to Android development. I want to know how you all manage objects. For eg we make object as A a = new A(); and then manage that object. But, here, we call A.class; My concern is that i don't want to call on Create(),nor do i want to push UI screen I just want to make 1 static object for 1 screen;and want to manage it throughout my application. that is, instead of calling A.class; can i call A a = new A(),and manage that object without pushing,and whenever i need i push that screen. Is there someway?

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Android :: Passing An ArrayList Of Objects

Nov 12, 2010

Is there a way to pass an Array List of objects between activities? The myObject implements Parcelable and I'm able to successfully pass the objects around individually, but that means I need to have an exact amount of "myObjects" coded. I want this to dynamically grow/shrink by what the user does with the app. I have seen some posts on the web about doing:

Activity A
ArrayList<myObject> myObjArray = new ArrayList<myObject>();

Then when passing this into the intent I would use:
intent.putParcelableArrayListExtra("myObjArray", myObjArray);

Activity B
ArrayList<myObject> myObjArray = new ArrayList<myObject>();
Bundle extras = getIntent().getExtras(); myObjArray = extras.getParcelableArray("myObjArray");

However, the myObjArray always gets filled with "null". How can I achieve this?

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Android :: Pass Objects Between Two Activities?

Aug 30, 2010

I want to pass an object from Activity B to Activity A. Scenario:
- Activity A calls Activity B
- User selects item in Activity B
- Activity B passes an object to Activity A

How do I accomplish this? And in which method do I read in the passed object in Activity A?

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Android :: Persistance Of Dynamic Objects

Aug 7, 2009

I am new to this android stuff and SQLlite etc.I am going to log some numbers at a certain interval, and will put them into a dynamic histogram, by dynamic i mean that there will be a maximum number of samples in the histogram, the histogram and age stuff should be persisted either in db or plain file.For simplicity, I would like the samples to be stored in a blob type datafield, but i cannot se if this is possible. Alternative i could have another table with the samples Or I could simply have files with filename = name and content = samples.my concern might be unclear by now, but put simply, what is most effecient regarding power usage?

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Android :: Storing An Array Of Objects

Mar 31, 2010

I have an array of 5 Timer objects in my app, some of wich have been scheduled with a TimerTask. I need to be able to store and load these 5 Timers; is there a way to save Objects? Maybe storing the address of the array would be enough? How could I do that?

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Android :: Getting Current On Screen GUI Objects

Mar 19, 2009

Is there any way for an Android application to retrieve some sort of Collection object that contains references to all of the GUI elements which are currently on the phone's screen? This could be very useful for testing purposes and so on. If I have overlooked a well-known class or library, please let me know.

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Android :: How To Add Objects To Sqlite Database?

Nov 18, 2009

I have a class like class My data{ String name; int data; Location[] locality.

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Android :: How 3D Objects Get Touch Events?

May 31, 2009

I am writing a game using OPENGL, there are several 3D objects in my surface view. My question is: Should each 3D object implement view in order to get touch events? Or there is other way to do this?

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Android :: Writing Objects From Thread

Jul 22, 2010

I have a game object that I save like this in OnPause()try {final ObjectOutputStream os = new ObjectOutputStream(openFileOutput(gameName + ".sav", 0)); os.writeObject(gameObject); os.reset();} catch (final Exception e) {e.printStackTrace();This works fine except on some of the older or slower phones it can sometimes take too long to complete. I end up getting a ANR (Activity Not Responding) error. I would like to move this to a thread to prevent blocking the UI. However when I try this I run into multiple problems.First openFileOutput is only available in my activity. I worked around this by passing the ObjectOutputStream to the thread. After that I could save the object but later when I tried to reload I get a java.io.EOF Exeception. does anyone have a good pattern for writing objects to a file from a thread?

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Android :: How To Send Objects Through Bundle?

Nov 22, 2010

I need to pass a reference to the class that does the majority of my processing through a bundle. The problem is it has nothing to do with intents or contexts and has a large amount of non-primitive objects. How do I package the class into a parcelable/serializable and pass it to a startActivityForResult?

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Android :: Correct Way To Add Objects To An ArrayList

Aug 19, 2010

I am trying to add an object to an arraylist but when I view the results of the array list, it keeps adding the same object over and over to the arraylist. I was wondering what the correct way to implement this would be.

CODE:..............

I have double checked my JSONArray data and made sure they are not duplicates. It seems to keep adding the first object over and over.

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Android :: Pass Objects From One Dialog To Other

Oct 27, 2010

I am trying to design an activity in Android which consist in a ListView with a button to add items to the List.

When the button is clicked, it opens a chain of Dialogs to configure the new item (each Dialog configures one attribute of the item Object). When the last Dialog is validated, the item is added to the list.

I was thinking of creating a new item Object when the first Dialog opens and using a setXXX() method on each Dialog validation to configure the object, but how am I supposed to pass the object from one Dialog to another?

I got it working using final objects, but it doesn't look clean to me at all. Plus I would have liked to use the activity Dialog manager methods such as onCreateDialog() and showDialog() to manage the Dialogs.

What is the cleanest way to do this?

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Android :: Eclipse MAT Does Not Appear To Show All App's Objects / How To See It

Feb 4, 2010

I have created an hprof file by inserting the statement Debug.dumpHprofData("/sdcard/myapp.hprof"); in my app's code; I have then run the hprof file through hprof-conv and opened the converted file in Eclipse.

Following the advice of the MAT "Cheat Sheet" I have obtained an analysis of my app's memory usage by going to "Leak Identification -> Component Report" entering "com.prepbgg.*" and hitting Finish.

I know that my app is consuming large amounts of memory: in particular at the stage where I called dumpHprofData it had a one megapixel bitmap object and a canvas that must have consumes several hundred KB. (I also suspect that it is leaking significant amounts of memory because performance degrades severely after the screen has been rotated a few times.)

However, the Component Report for com.prepbgg.* shows total memory of only 38.7KB. The Histogram view shows for android.graphics.Bitmap (presumably this is the total of all apps including mine) 404 objects and Shallow Heap 12,928. Is that 12,928 bytes?

Clearly, my app consumes more than 38.7KB and the Bitmap far more than 12,928 bytes. Where am I going wrong? How can I see the total memory consumed by my app?

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Android :: Bundles And Serializable Objects - What Is Actually Stored?

Mar 24, 2009

was wondering about the behavior of Bundles and serializable objects. If I put a serializable object into a bundle, what is serialized then, the reference to the object or the object itself? I always assumed that the object itself would be serialized to a byte stream when calling putExtra() and re-created from that representation when calling getSerializableExtra(), but I recently stumbled upon a piece of code that put an entire view into a Bundle in thread A, retrieved it from that bundle in thread B, performed a modification on it and this modification actually became visible. This can only happen if the reference to that view was stored, not the view itself, right? Otherwise, the modification had been applied to a copy of that view and would be meaningless.

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