You can just make it accepted by default (the user won't be prompted) by using smth like:
final FileTransferManager manager = new FileTransferManager(connection); //Use your xmpp connection
manager.addFileTransferListener(new FileTransferListener() {
public void fileTransferRequest(FileTransferRequest request) {
IncomingFileTransfer transfer = request.accept();
try {
InputStream input = transfer.recieveFile();
//This will be a binary stream and you can process it. Create image and display it inline in your chat app.
} catch (XMPPException e) {
e.printStackTrace();
}
}
}