Hi.
I may be wrong, but I velibe its normal.
When you are giving a resource as bitmap, i think it will reuse the same bitmap
all the time, so you have 900 markers, but only a bitmap. But with your
function you are creating 900 bitmaps, so you are eating a lot of memory. Also
you arent disposing anything, try to dispose all the resources you will not use
and may be it will work.
Also a GC.Collect can help.
Hope it helps.
Enviado desde mi iPad
El 04/07/2013, a las 16:44, Goncalo Oliveira <gonc...@minkan.net> escribió:
> Hi,
>
> I'm facing an issue with Google maps and custom bitmaps as marker icons and
> I'm a little confused if I'm doing the thing the wrong way or there's
> something wrong happening either with Google maps component or with the
> Xamarin - JVM bridge.
>
> 1. I'm placing a huge quantity of markers on the map. Let's start with 900.
> I'm generating random locations around a point to create these much different
> LatLng objects.
>
> Next, I do the following for each LatLng item.
>
> string title = "Item " + ( itemIndex++ ).ToString(); // just
> for readability
>
> var iconMarkerOption = new MarkerOptions()
> .SetPosition( item )
> .SetSnippet( "Snippet" )
> .Anchor( 0.5f, 0.5f )
> .SetTitle( title );
>
> map.AddMarker( iconMarkerOption );
>
> Build, Run and... all's well. 900 markers on the screen and not a care in the
> world.
>
> 2. I don't want to use the default image, to I change the code to use my own.
>
> var iconMarkerOption = new MarkerOptions()
> .SetPosition( item )
> .SetSnippet( "Snippet" )
> .Anchor( 0.5f, 0.5f )
> .InvokeIcon( BitmapDescriptorFactory.FromResource(
> Resource.Drawable.ic_marker1 ) )
> .SetTitle( title );
>
> Again, build, run and... all's well. 900 markers on the screen with my own
> icon.
>
> 3. I don't want just a standard image, I want to add some label text to each
> icon. So I create the following method.
>
> private Paint paint = new Paint( PaintFlags.AntiAlias );
> private Rect bounds = new Rect();
> private BitmapDescriptor GetCustomBitmapDescriptor( string text )
> {
> Bitmap baseBitmap = BitmapFactory.DecodeResource( Resources,
> Resource.Drawable.ic_marker1 );
> Bitmap bitmap = baseBitmap.Copy( Bitmap.Config.Argb8888, true );
>
> paint.GetTextBounds( text, 0, text.Length, bounds );
>
> float x = bitmap.Width / 2.0f;
> float y = ( bitmap.Height - bounds.Height() ) / 2.0f - bounds.Top;
>
> Canvas canvas = new Canvas( bitmap );
>
> canvas.DrawText( text, x, y, paint );
>
> BitmapDescriptor icon = BitmapDescriptorFactory.FromBitmap(
> bitmap );
>
> return ( icon );
> }
>
> and I change my code
>
> var iconMarkerOption = new MarkerOptions()
> .SetPosition( item )
> .SetSnippet( "Snippet" )
> .Anchor( 0.5f, 0.5f )
> .InvokeIcon( GetCustomBitmapDescriptor( title ) )
> .SetTitle( title );
>
> Build, run and... out of memory.
> 07-04 15:32:35.055: E/mono(6005): Unhandled Exception:
> 07-04 15:32:35.055: E/mono(6005): Java.Lang.OutOfMemoryError: Exception of
> type 'Java.Lang.OutOfMemoryError' was thrown.
> 07-04 15:32:35.055: E/mono(6005): at
> Android.Runtime.JNIEnv.CallStaticObjectMethod
> (intptr,intptr,Android.Runtime.JValue[]) <0x00080>
> 07-04 15:32:35.055: E/mono(6005): at
> Android.Gms.Maps.Model.BitmapDescriptorFactory.FromBitmap
> (Android.Graphics.Bitmap) <0x00103>
> 07-04 15:32:35.055: E/mono(6005): at
> MapsExtensionsTest.MainActivity.GetCustomBitmapDescriptor (string) <0x001b7>
> 07-04 15:32:35.055: E/mono(6005): at
> MapsExtensionsTest.MainActivity.button_Click (object,System.EventArgs)
> <0x00187>
> 07-04 15:32:35.055: E/mono(6005): at
> Android.Views.View/IOnClickListenerImplementor.OnClick (Android.Views.View)
> <0x0005b>
> 07-04 15:32:35.055: E/mono(6005): at
> Android.Views.View/IOnClickListenerInvoker.n_OnClick_Landroid_view_View_
> (intptr,intptr,intptr) <0x0005b>
> 07-04 15:32:35.055: E/mono(6005): at (wrapper dynamic-method)
> object.d67d7456-e896-445d-be35-db0b39982fc0 (intptr,intptr,intptr) <0x00043>
> 07-04 15:32:35.055: E/mono(6005): --- End of managed exception stack trace
> ---
> 07-04 15:32:35.055: E/mono(6005): java.lang.OutOfMemoryError
> 07-04 15:32:35.055: E/mono(6005): at
> android.graphics.Bitmap.nativeCreateFromParcel(Native Method)
>
> I tried changing the baseBitmap decoding to some place else, so that it's
> only called once, as it's kind of lame to do this every single time.
>
> private Paint paint = new Paint( PaintFlags.AntiAlias );
> private Rect bounds = new Rect();
> Bitmap baseBitmap = null;
> private BitmapDescriptor GetCustomBitmapDescriptor( string text )
> {
> if ( baseBitmap == null )
> {
> baseBitmap = BitmapFactory.DecodeResource( Resources,
> Resource.Drawable.ic_marker1 );
> }
>
> Bitmap bitmap = baseBitmap.Copy( Bitmap.Config.Argb8888, true );
>
> paint.GetTextBounds( text, 0, text.Length, bounds );
>
> float x = bitmap.Width / 2.0f;
> float y = ( bitmap.Height - bounds.Height() ) / 2.0f - bounds.Top;
>
> Canvas canvas = new Canvas( bitmap );
>
> canvas.DrawText( text, x, y, paint );
>
> BitmapDescriptor icon = BitmapDescriptorFactory.FromBitmap(
> bitmap );
>
> return ( icon );
> }
>
> Build, run and... again, out of memory...
> 07-04 15:36:42.175: E/mono(6409): Java.Lang.OutOfMemoryError: Exception of
> type 'Java.Lang.OutOfMemoryError' was thrown.
> 07-04 15:36:42.175: E/mono(6409): at Android.Runtime.JNIEnv.CallObjectMethod
> (intptr,intptr,Android.Runtime.JValue[]) <0x00080>
> 07-04 15:36:42.175: E/mono(6409): at Android.Graphics.Bitmap.Copy
> (Android.Graphics.Bitmap/Config,bool) <0x00167>
> 07-04 15:36:42.175: E/mono(6409): at
> MapsExtensionsTest.MainActivity.GetCustomBitmapDescriptor (string) <0x00097>
> 07-04 15:36:42.175: E/mono(6409): at
> MapsExtensionsTest.MainActivity.button_Click (object,System.EventArgs)
> <0x00187>
> 07-04 15:36:42.175: E/mono(6409): at
> Android.Views.View/IOnClickListenerImplementor.OnClick (Android.Views.View)
> <0x0005b>
> 07-04 15:36:42.175: E/mono(6409): at
> Android.Views.View/IOnClickListenerInvoker.n_OnClick_Landroid_view_View_
> (intptr,intptr,intptr) <0x0005b>
> 07-04 15:36:42.175: E/mono(6409): at (wrapper dynamic-method)
> object.8ea9efe6-5373-404e-9980-0a2a1ca9397f (intptr,intptr,intptr) <0x00043>
> 07-04 15:36:42.175: E/mono(6409): --- End of managed exception stack trace
> ---
> 07-04 15:36:42.175: E/mono(6409): java.lang.OutOfMemoryError
> 07-04 15:36:42.175: E/mono(6409): at
> android.graphics.Bitmap.nativeCopy(Native Method)
> 07-04 15:36:42.175: E/mono(6409): at
> android.graphics.Bitmap.copy(Bitmap.java:403)
> 07-04 15:36:42.175: E/mono(6409): at
> mono.android.view.View_OnClickListenerImplementor.n_onClick(Native Method)
> 07-04 15:36:42.175: E/mono(6409): at mono.androi
>
> What can I do to avoid this? If the Google maps can do this when using the
> resource id directly, there has to be a way, right?...
>
> Any thoughts on this would be highly appreciated.
>
> Cheers.
>
>
> --
> Gonçalo Oliveira
>
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