从图片uri中构造彩信pdu数据

public static byte[] getBytesFromUri(Uri mediaUri, Context context){
PduHeaders headers = new PduHeaders();

SendReq req = new SendReq();

String dests[] = {"123123"};
EncodedStringValue[] encodedNumbers = EncodedStringValue.encodeStrings(dests);
if (encodedNumbers != null) {
req.setTo(encodedNumbers);
}

String subject = new String("subject");
if (null != subject) {
req.setSubject(new EncodedStringValue(subject.toString()));
}
req.setDate(System.currentTimeMillis() / 1000L);
try{
SlideshowModel slideshow = SlideshowModel.createNew(context);
SlideModel slide = new SlideModel(slideshow);
ImageModel media = new ImageModel(context, mediaUri, slideshow.getLayout().getImageRegion());

slideshow.add(slide);
slideshow.get(0).add(media);

PduBody pb = slideshow.toPduBody();
req.setBody(pb);

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

// Priority.
req.setPriority(PduHeaders.PRIORITY_NORMAL);
// Delivery report.
req.setDeliveryReport(PduHeaders.VALUE_NO);
// Read report.
req.setReadReport(PduHeaders.VALUE_NO);

req.setMessageClass(PduHeaders.MESSAGE_CLASS_PERSONAL_STR.getBytes());
req.setDate(System.currentTimeMillis() / 1000L);

}catch (MmsException e){
Log.d(TAG, "error"+e);
}
PduComposer compose = new PduComposer(context, req);
return compose.make();
//return req;

}