topic Re: mapview.getMapDrawingCache() returns null in ArcGIS Runtime SDK for Android Questions

mapview.getMapDrawingCache() returns null

SwatiGadey — Fri, 30 Dec 2011 20:17:17 GMT

I am trying to create a bitmap image of the Map (MapView object) as follows:

Bitmap drawingCache = mapview.getDrawingCache(true);
Btimap bitmap = mapview.getDrawingMapCache(0, 0, mapview.getWidth(), mapview.getHeight());
Bitmap drawingCache = mapview.getDrawingCache(false);

This returns a null in my 'bitmap' object. What is the correct way of using mapview.getMapDrawingCache method for getting map image?

Re: mapview.getMapDrawingCache() returns null

ArchanaAgarwal — Thu, 05 Jan 2012 16:58:26 GMT

Please try getDrawingMapCache()

Re: mapview.getMapDrawingCache() returns null

SwatiGadey — Fri, 06 Jan 2012 18:37:43 GMT

Sorry for the confusion. I meant using mapview.getDrawingMapCache() (Sorry about the typo). This returns null.
Earlier, I had been using mapview.getDrawingCache() to get the map image, which is not working either. Instead of the map's image, now I get a blank image with black background.

Re: mapview.getMapDrawingCache() returns null

SwatiGadey — Sat, 11 Dec 2021 11:51:20 GMT

@Archana - Meanwhile, I had implemented getting the map image using the following snippet:

          // Code in "OnLongPressListener"
                       ------------
                       ------------
                        map.setDrawingCacheEnabled(true);

   Bitmap drawingCache = map.getDrawingCache(true);
   Log.d(TAG,"Drawing cache = " + drawingCache.getWidth()); // 480

   Bitmap bitmap = Bitmap.createBitmap(drawingCache, 0, 0, drawingCache.getWidth(), drawingCache.getHeight());
   Log.d(TAG,"Bitmap cache = " + bitmap.getWidth()); // 480
   map.setDrawingCacheEnabled(false);

                       ------------
                       ------------


                       protected void onDraw(Canvas canvas) {
   if (X > 0 && Y > 0) {

    Bitmap croppedBitmap = Bitmap.createBitmap(bitmap, (int) X - 35, (int) Y - 35, 70, 70);
    Log.d(TAG, "cropped bitmap = " + croppedBitmap.getWidth());   // 70

    int left = (int) X - 75;
    int top = (int) Y - 150;
    int right = (int) X + 75;
    int bottom = (int) Y;
    RectF dst = new RectF(left, top, right, bottom);

    canvas.drawBitmap(croppedBitmap, null, dst, new Paint());
                                -------------
                                -------------
                       }

This worked before the SDK release (with the Beta version). However, returns me a black image now (and not a map image). Am I going wrong somewhere here?
Thanks for your help.

Re: mapview.getMapDrawingCache() returns null

BradFrecker — Mon, 06 Feb 2012 13:43:24 GMT

I'm seeing the same thing. Is this a problem with the SDK, or are we doing something wrong?

Re: mapview.getMapDrawingCache() returns null

SwatiGadey — Wed, 15 Feb 2012 14:56:43 GMT

My understanding is that this is a bug, which ESRI is working on.

You may also want to check out the response from ESRI DEV in Thread: Magnify tool
http://forums.arcgis.com/threads/45706-Magnify-tool

Re: mapview.getMapDrawingCache() returns null

ArchanaAgarwal — Tue, 03 Apr 2012 21:13:27 GMT

Fundamentally the first two coordinates must be screen coordinates. If you have that correct it should just work.
We will be releasing shortly, this functionality should work.

map.setOnSingleTapListener(new OnSingleTapListener() {

   @Override
   public void onSingleTap(float arg0, float arg1) {
                                Bitmap bitmap = map.getDrawingMapCache(arg0,arg1,100,100);
    ImageView img = new ImageView(ClassName.this);
    img.setImageBitmap(bitmap);

    map.addView(img);}});

Re: mapview.getMapDrawingCache() returns null

SimonKlein — Tue, 10 Apr 2012 09:24:06 GMT

This still does not work for me in 1.1
I copied this code in the onSingleTap of the Rotation sample.
The Bitmap is always null.
Tested on Android 4.0.4. and 3.2.

Re: mapview.getMapDrawingCache() returns null

SimonKlein — Tue, 17 Apr 2012 07:53:35 GMT

Did anybody find a solution for this?

Re: mapview.getMapDrawingCache() returns null

SimonKlein — Sat, 11 Dec 2021 11:51:23 GMT

ok i found one. ugly but it works:

while (mailBitmap == null) {
     mailBitmap = mMapView.getDrawingMapCache(0f, 0f,
       mMapView.getWidth(), mMapView.getHeight());
    }

The first time you try it it takes up to 1400 attempts, but after that it gets quicker.

Re: mapview.getMapDrawingCache() returns null

SimonKlein — Mon, 14 May 2012 07:57:51 GMT

Can anybody reproduce this please, so it might get considered as a bug?

EDIT: The map is definitely loaded. I'm checking with MapView.isloaded() but on the frist run it still takes me now 103529 calls (on a rather complex webmap structure) of getDrawingMapCache to get a not null value. On the second run it takes only one call if the extent is not changed. The problem here is, that the map becomes really really slow after calling the getDrawingMapCache Method so many times. Some sort of memory leak somewhere I would guess.

Re: mapview.getMapDrawingCache() returns null

AndyGup — Mon, 14 May 2012 15:56:40 GMT

Simon, I'm not familiar with this one, but I'm looking into whether it was a bug or not.

-Andy

Re: mapview.getMapDrawingCache() returns null

ArchanaAgarwal — Tue, 29 May 2012 19:29:59 GMT

The problem is that when the bitmap is the entire map there is a lag in generating the bitmap.
If the bitmap is a smaller area the lag is unnoticeable.

This a bug we are fixing.

The code posted earlier if executed twice works without a problem.

Try using the code below, if you single tap on the map twice you will see the bitmap.

map.setOnSingleTapListener(new OnSingleTapListener() {

      /**
       *
       */
      private static final long serialVersionUID = 1L;

      public void onSingleTap(float arg0, float arg1) {
       Polygon polygon = map.getExtent();
       Envelope env = new Envelope();
       polygon.queryEnvelope(env);
       Bitmap bitmap = map.getDrawingMapCache(arg0, arg1,
         100, 100));
//                                                        Bitmap bitmap = map.getDrawingMapCache(0, 0,
//         map.getWidth(), map.getHeight()));
       Log.d(TAG, "width = " + map.getWidth() + " ht = "
         + map.getHeight());
       ImageView img = new ImageView(HelloWorld.this);
       img.setImageBitmap(bitmap);
       map.addView(img);
      }
     });

Thanks
Archana

Re: mapview.getMapDrawingCache() returns null

AndyGup — Thu, 31 May 2012 16:13:42 GMT

For reference: this problem has been logged under NIM081315.

-Andy

Re: mapview.getMapDrawingCache() returns null

deleted-user-ATjHIWsdQYmT — Thu, 31 May 2012 17:25:45 GMT

For reference: this problem has been logged under CR233566.

-Andy

To further expand on this:
I used the above code to generate an output image. My map has a callout visible. After looping +1000 times, I'm able to get the image out, BUT the map view displays a black box behind the callout. Also, any other views that I have on top of my Map View (i.e. zoom contols) also have a black box behind them.

Here's a couple images..
outputimage = image output from export code
MapViewAfterExport = Map View after export. Notice the black box behind the callout
MapViewAfterExport_closeCallout = Map View after export and callout is closed. Notice the black box behind the zoom controls.

Any ideas??

[ATTACH=CONFIG]14812[/ATTACH][ATTACH=CONFIG]14813[/ATTACH][ATTACH=CONFIG]14814[/ATTACH]

Re: mapview.getMapDrawingCache() returns null

deleted-user-ATjHIWsdQYmT — Mon, 23 Jul 2012 15:48:34 GMT

Any update on NIM081315?

Re: mapview.getMapDrawingCache() returns null

AndyGup — Tue, 31 Jul 2012 13:54:32 GMT

The system says NIM081315 is resolved: http://support.esri.com/en/bugs/nimbus/TklNMDgxMzE1

Are you still having problems when using the latest SDK? If you are then please consider opening another support ticket. We may have missed something unique in your setup or configuration. Opening a ticket will help us track down and document any loose ends.

-Andy

Re: mapview.getMapDrawingCache() returns null

deleted-user-ATjHIWsdQYmT — Tue, 31 Jul 2012 13:58:09 GMT

I'm wondering if you provided the wrong NIM in a previous thread. The Synopsis says: GraphicsLayer.createSymbolImages causes app to hang or respond slowly. That's not the issue we are all experiencing here.

Re: mapview.getMapDrawingCache() returns null

deleted-user-ATjHIWsdQYmT — Tue, 31 Jul 2012 14:13:29 GMT

However, I forgot to mention the bug does in fact seem to be fixed.

To expand - Any idea on how to include the callout as part of the image export? It doesn't appear to be part of the MapView's drawing cache.

Re: mapview.getMapDrawingCache() returns null

AndyGup — Tue, 31 Jul 2012 15:58:32 GMT

I saw that too right after I posted it. We're running this down now to make 100% sure.

-Andy