我通过位图API从图库中加载图片,但是图片的方向与我保存的不同。在stackoverflow上某处我读到需要获取方向值,然后旋转矩阵。我尝试了这个方法,但我的方向值从exif接口中获取为0。
int desiredImageWidth = 310; // pixels
int desiredImageHeight = 518; // pixels
Log.i("FA", "Image Loading "+strFileName);
BitmapFactory.Options o = new BitmapFactory.Options();
Bitmap newImage = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(strFileName, o),
desiredImageWidth,
desiredImageHeight,
false);
Bitmap finalBmp = getCorrectOrientedBitmap(strFileName,newImage);
Bitmap myBitmap32 = finalBmp.copy(Bitmap.Config.ARGB_8888, true);
Mat matImg = Utils.bitmapToMat(myBitmap32);
我的主要定位函数是
private Bitmap getCorrectOrientedBitmap(String filename,Bitmap Source) throws IOException{
Bitmap rotatedBitmap = null;
ExifInterface exif = new ExifInterface(filename);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Matrix matrix = new Matrix();
Log.i("FA", "orientation "+orientation);
switch(orientation)
{
case 6:
matrix.postRotate(90);
break;
case 3:
matrix.postRotate(180);
break;
case 8:
matrix.postRotate(270);
break;
}
rotatedBitmap = Bitmap.createBitmap(Source, 0, 0, Source.getWidth(), Source.getHeight(), matrix, true);
return rotatedBitmap;
}