Android Snippet: Draw layout to a Bitmap
I needed this code for a project, where I needed to capture a certain list item I was rendering into a Bitmap and upload it using Facebook’s SDK.
This snippet basically “screen captures” and draws a certain view and saves it as a Bitmap and is the right way to do this.
Another solution to this is trying to draw everything on Canvas* “manually”, but taking the time to figure out all the bounds and text sizes, and getting the exact positions of things on a canvas sound like a real inconvenience. This makes it the wrong way to do this.
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// Create a new bitmap and a new canvas using that bitmap Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bmp); // Get LayoutInflater reference LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); // Inflate the View View layout = inflater.inflate(R.layout.layout_name, null); layout.setDrawingCacheEnabled(true); // Supply measurements layout.measure(MeasureSpec.makeMeasureSpec(canvas.getWidth(), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(canvas.getHeight(), MeasureSpec.EXACTLY)); // Apply the measures so the layout would resize before drawing. layout.layout(0, 0, layout.getMeasuredWidth(), layout.getMeasuredHeight()); // and now the bmp object will actually contain the requested layout canvas.drawBitmap(layout.getDrawingCache(), 0, 0, new Paint()); |
And you’re done!
