Cursor always giving null in android

Question

i want to check orientation of an image so i found some code but it doesn't work because cursor is always null. My code is

File f = createImageFile(bitmap);
String[] orientationColumn = {MediaStore.Images.Media.ORIENTATION};
Cursor cur = context.getContentResolver().query(Uri.parse(f.toString()), orientationColumn, null, null, null);
int orientation = -1;
if (cur != null && cur.moveToFirst()) {
   orientation = cur.getInt(cur.getColumnIndex(orientationColumn[0]));
}
Matrix matrix = new Matrix();
matrix.postRotate(orientation);

private static File createImageFile(Bitmap bitmap) {
    //create a file to write bitmap data
    String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath();
    File f = new File(fullPath, "image"+ System.currentTimeMillis()+".jpg");
    try {
        f.createNewFile();
    } catch (IOException e) {
        e.printStackTrace();
    }

    //Convert bitmap to byte array
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    if (bitmap != null) {
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100 /*ignored for PNG*/, bos);
    }
    byte[] bitmapdata = bos.toByteArray();

    //write the bytes in file
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(f);
        fos.write(bitmapdata);
        fos.flush();
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return f;
}

But cur always returns null.I searched for converting file to uri so i found two methods Uri.parse(f.toString() and Uri.fromFile(f) but none has worked.