Android bitmap旋转、平移简单几何变换很方便

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1.顺时针旋转90度

byte[] tmp = os.toByteArray();
Bitmap bmpt = BitmapFactory.decodeByteArray(tmp, 0,tmp.length);
Matrix matrix = new Matrix();
matrix.postRotate(90);
Bitmap bmp = Bitmap.createBitmap(bmpt, 0,0,bmpt.getWidth(),  bmpt.getHeight(), matrix, false);