canvas.drawBitmap gives two different results

Question

I m taking screenshot of android screen and Draw another image on captured image (watermark) using canvas.drawBitmap,

it all giving proper result when i copy the Watermark(another image - say visit.jpg) image on SD card, the captured image has width 500pixel, where visit.jpg has width- 339pixels,

File file = new File( Environment.getExternalStorageDirectory() + "/visit.jpg"); Bitmap myBitmap = BitmapFactory.decodeFile(file.getAbsolutePath());

but i dont want to copy the watermark image into sdcard, i want the image from res folder should get draw on captured image, so i used

Bitmap visit = BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.visit);

and draw on canvas and saved, it get saved, but the Watermark image(visit.jpg) gets stretch and its size gets larger than 339pixels. why ?

my code is :

 View v1 = findViewById(android.R.id.content).getRootView(); v1.setDrawingCacheEnabled(true); Bitmap screenshot = Bitmap.createBitmap(v1.getDrawingCache()); Bitmap cropimg = Bitmap.createBitmap(screenshot, 50, 0, screenshot.getWidth()-100, 592); v1.setDrawingCacheEnabled(false); Bitmap Rbitmap = Bitmap.createBitmap(cropimg).copy(Config.ARGB_8888, true); Bitmap visit = BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.visit); // image accessed from drawable Canvas canvas = new Canvas(Rbitmap); File file = new File( Environment.getExternalStorageDirectory() + "/visit.jpg"); // the image copied on sd card Bitmap myBitmap = BitmapFactory.decodeFile(file.getAbsolutePath()); canvas.drawBitmap(visit, 0, 570, null); // if i put myBitmap instead of visit i.e. canvas.drawBitmap(myBitmap, 0, 570, null); then visit.jpg image gets draw properly with 339pixel width without strtch canvas.save();

I'm not an expert on the topic but you could try using BitmapFactory.decodeResource(..., BitmapFactory.Options) where you make sure that Options.inScaled is set to false. — harism
– harism, Commented Jan 6, 2013 at 13:24
Try visit.getWidth() and visit.getHeight(), to see if the bitmap is stretched or if it happens later. — Jave
– Jave, Commented Jan 6, 2013 at 14:10
visit.jpg is 339x22,but visit.getWidth() shows 452 and visit.getHeight() shows 29, why ? — Sunil Lohar
– Sunil Lohar, Commented Jan 6, 2013 at 14:27
That is somehow strange. I tried to reproduce your situation by quickly prototyping a similar app. The watermark appears OK on my side, without stretch. Link: img801.imageshack.us/img801/4971/savedimage.jpg (Penguins is the watermark) — Andy Res
– Andy Res, Commented Jan 6, 2013 at 14:41
@AndyRes , which one you tried the File-Bitmap or BitmapFactory ? as i mentioned using File-Bitmap, is giving proper result. — Sunil Lohar
– Sunil Lohar, Commented Jan 6, 2013 at 15:48

Neil · Accepted Answer · 2013-01-07 20:22:57Z

EDIT: I forgot an easier way, put the images in /res/drawable-nodpi folder.

Android will automatically scale the resource image depending on your screen density. The default drawable folder correspond to the mdpi so if you have a hdpi device the image will be scaled up. You can put the image into the /res/raw/ folder then open it like:

Uri imageUri = Uri.parse("android.resource://your.app.package/raw/visit"); InputStream is = context.getContentResolver().openInputStream(imageUri); Bitmap bmp = BitmapFactory.decodeStream(is, null, opts);

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