如何在没有ExifInterface的情况下确定图片的方向？

Question

我将图像加载到a中bitmap并且需要知道所拍摄图像的方向(来自相机)以正确显示它.使用以下代码的方法工作得很好(自API级别5以来),但该怎么办android:minSdkVersion="4"？还有另外一种方法吗？

ExifInterface exif = new ExifInterface(SourceFileName);     //Since API Level 5
String exifOrientation = exif.getAttribute(ExifInterface.TAG_ORIENTATION);

Answer 1

Matrix matrix = new Matrix();

ExifInterface exifReader = new ExifInterface(filePath);

int orientation = exifReader.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);

if (orientation ==ExifInterface.ORIENTATION_NORMAL) {

// Do nothing. The original image is fine.
} else if (orientation == ExifInterface.ORIENTATION_ROTATE_90) {

       matrix.postRotate(90);

} else if (orientation == ExifInterface.ORIENTATION_ROTATE_180) {

       matrix.postRotate(180);

} else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) {

       matrix.postRotate(270);

}