How to determine orientation of picture without ExifInterface?

I load an image into a bitmap and need to know the orientation of the taken picture (from camera) t开发者_开发技巧o show it correctly. The way to use the following code is working nice (since API Level 5), but what to do if android:minSdkVersion="4"? Is there another way?

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

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);

}

Easy implement your own exif reader

Then

Metadata metadata = JpegMetadataReader.readMetadata(new File(imagePath));
Directory jpegDirectory = metadata.getDirectory(JpegDirectory.class);
 int height = jpg.GetImageHeight();
 int width = jpg.GetImageWidth();