I have a drawing app I'd like to have the ability to: 1) in onDraw, display a 'thumbnail' view of the current screen to to user (thumbnail will be in bottom corner, so the user can see where they are if they zoom in)
2) save the Screen to the SD card as an image file. So I am trying to figure out how to set up my View properly such that I can access the Bitmap that the onDraw is drawing too as I need it from anywhere (I will need to save the Bitmap when the calling Activity is being shutdown, etc). I have two fields in my custom View class, mCanvas, mBitmap. In onSizeChanged(), when the View is expanded, I instatiate the objects like so: mCanvas = new Canvas(); mBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); mCanvas.setBitmap(mBitmap); draw(mCanvas); My understanding is that calling draw(mCanvas) sets the canvas to use in subsequent onDraw() calls so that all drawing in onDraw will be sent via mCanvas to mBitmap. Is this correct? I ask because I have been trying to tackle #1 above, and when I get a scaled version of the bitmap in onDraw when I try to draw the thumbnail, the scaled version is not showing the elements that are being added to the canvas. For instance, if I draw lines to the canvas, via onDraw, I see those on the screen. If I draw more lines, those show up. If I then zoom in and at the time of zooming, scale the bitmap, it is blank. Here is how I am scaling the bitmap, thumbnailRectF is a rectangle that I draw to the screen prior to this call, using it as a border for the thumbnail: Bitmap out = Bitmap.createScaledBitmap(mBitmap, 100, 100, false); canvas.drawBitmap(out, null, thumbnailRectF, thumbCanvasPaint); Am I doing something obviously incorrect in how I am attaching the View's built-in canvas to my mBitmap? Can anyone suggest a better way to do this? Thanks, Paul -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
