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POAndroid custom view Bitmap memory leak
 

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  1. POAndroid custom view Bitmap memory leak
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    <p>I've got a custom view in which I need to draw two bitmaps, one is a background, representing the image of a map and one is a pin which will be drawn on top/left position in canvas. </p> <p>The both images are drawn onDraw and remain the same during the live of the activity that contains the view. After a while I get a </p> <blockquote> <p>OutOfMemoryError: bitmap size exceeds VM budget</p> </blockquote> <p>This means that I have a leak and the bitmaps don't get garbage collected. I asked this question before, but now the situation changed a little. I made a init method where I set the bitmaps I want to use but this still isn't a good approach, the error appears later, but still there.</p> <p>Here is the code</p> <pre><code>public class MyMapView extends View { private int xPos = 0; private int yPos = 0; private int space = 0; private Bitmap resizedBitmap; private Bitmap position; private Bitmap mapBitmap; public void setMapBitmap(Bitmap value) { this.mapBitmap = value; } public MyMapView(Context context) { super(context); } public MyMapView(Context context, AttributeSet attrs) { super(context, attrs); } public MyMapView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public void init(final Context context) { Paint paint = new Paint(); paint.setFilterBitmap(true); int width = getMeasuredWidth(); int height = getMeasuredHeight(); resizedBitmap = Bitmap.createScaledBitmap(mapBitmap, height, height, true); position = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.position); space = (width - resizedBitmap.getWidth()) / 2; } public void destroy() { resizedBitmap.recycle(); resizedBitmap=null; position.recycle(); position=null; mapBitmap.recycle(); mapBitmap=null; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec)); } @Override protected void onDraw(Canvas canvas) { if (mapBitmap != null) { canvas.drawBitmap(resizedBitmap, space, 0, null); } if (xPos != 0 &amp;&amp; yPos != 0) { canvas.translate(xPos + space - position.getWidth() / 2, yPos - position.getHeight() / 2); canvas.drawBitmap(position, new Matrix(), new Paint()); } } public void updatePosition(int xpos, int ypos) { xPos = xpos; yPos = ypos; invalidate(); } } </code></pre> <p>I call the setMapBitmap() and init() on onCreate of the activity that contains the view. In there I know what bitmap will be used as map. onPause of the activity I call the destroy() of the view. I still get errors. I've read this <a href="http://mobi-solutions.blogspot.com/2010/08/how-to-if-you-want-to-create-and.html">this</a> but I don't know how to adapt it on my case</p> <p>I AM OPEN TO ANY OTHER SOLUTION. Please note that I need to resize the map bitmap (based on the height of the layout that contains it in mai activity) and still be able to draw the position on correct place. </p>
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    1. CODo you run this on emulator or device? Under debugger or without it?
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      1. USPeter Knego
    2. COI ran it on my emulator without debugging it. With debugging activated is too slow. Thank you.
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    3. COWhy don't you clear the mapBitmap when you have resizedBitmap ? Another thing is resize the bitmap when you need it i.e. resize the bitmap in onDraw and then clear it out so that it can be GC'ed.
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