I am saving an image from the camera that was in landscape mode. so it gets saved in landscape mode and then i apply an overlay onto it that too is in landscape mode. I want to rotate that image and then save. e.g. if i have this
I want to rotate clockwise by 90 degrees once and make it this and save it to sdcard:
How is this to be accomplished?
void rotate(float x) { Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),R.drawable.tedd); int width = bitmapOrg.getWidth(); int height = bitmapOrg.getHeight(); int newWidth = 200; int newHeight = 200; // calculate the scale - in this case = 0.4f float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); matrix.postRotate(x); Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,width, height, matrix, true); iv.setScaleType(ScaleType.CENTER); iv.setImageBitmap(resizedBitmap); } 
Check this
public static Bitmap rotateImage(Bitmap src, float degree) { // create new matrix Matrix matrix = new Matrix(); // setup rotation degree matrix.postRotate(degree); Bitmap bmp = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true); return bmp; } You can use the Canvas API to do that. Note that you need to switch width and height.
final int width = landscapeBitmap.getWidth(); final int height = landscapeBitmap.getHeight(); Bitmap portraitBitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888); Canvas c = new Canvas(portraitBitmap); c.rotate(90, height/2, width/2); c.drawBitmap(landscapeBitmap, 0,0,null); portraitBitmap.compress(CompressFormat.JPEG, 100, stream); Use a Matrix.rotate(degrees) and draw the Bitmap to it's own Canvas using that rotating matrix. I don't know though if you might have to make a copy of the bitmap before drawing.
Use Bitmap.compress(...) to compress your bitmap to an outputstream.
The solution of Singhak works fine. In case you need fit the size of result bitmap (perhaps for ImageView) you can expand the method as follows:
public static Bitmap rotateBitmapZoom(Bitmap bmOrg, float degree, float zoom){ Matrix matrix = new Matrix(); matrix.postRotate(degree); float newHeight = bmOrg.getHeight() * zoom; float newWidth = bmOrg.getWidth() / 100 * (100.0f / bmOrg.getHeight() * newHeight); return Bitmap.createBitmap(bmOrg, 0, 0, (int)newWidth, (int)newHeight, matrix, true); } 