本文介绍了一种使用Android平台的Bitmap对象进行图像处理的方法，包括图像旋转、裁剪及显示。通过设置矩阵变换实现90度旋转，并利用Rect定义扫描区域来精确裁剪图片。
ByteArrayOutputStream stream = new ByteArrayOutputStream();
image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream);
Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size());
Matrix matrix = new Matrix();
matrix.setRotate(90);
bmp = Bitmap.createBitmap(bmp, 0, 0, size.width, size.height, matrix, false);
//图片旋转后
Rect imageRect = finder_view.getScanAreaRect(size.height, size.width);
bmp = Bitmap.createBitmap(bmp, imageRect.left, imageRect.top, imageRect.width(), imageRect.height());
//此时的bmp已经只包含了框内的画面
stream.reset();
display.setImageBitmap(bmp);
image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream);
Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size());
Matrix matrix = new Matrix();
matrix.setRotate(90);
bmp = Bitmap.createBitmap(bmp, 0, 0, size.width, size.height, matrix, false);
//图片旋转后
Rect imageRect = finder_view.getScanAreaRect(size.height, size.width);
bmp = Bitmap.createBitmap(bmp, imageRect.left, imageRect.top, imageRect.width(), imageRect.height());
//此时的bmp已经只包含了框内的画面
stream.reset();
display.setImageBitmap(bmp);
扫一扫
442
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
