why is the app not displaying the text

Question

public class InboxFragment extends ListFragment {

protected List<ParseObject> mMessages;
private CharSequence displayMessage;




@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_inbox, container, false);

    return rootView;
}

@Override
public void onResume() {
    super.onResume();

    getActivity().setProgressBarIndeterminateVisibility(true);

ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(ParseConstants.CLASS_MESSAGES);
query.whereEqualTo(ParseConstants.KEY_RECIPIENT_IDS,ParseUser.getCurrentUser().getObjectId());
query.addDescendingOrder(ParseConstants.KEY_CREATED_AT);
query.findInBackground(new FindCallback<ParseObject>() {

    @Override
    public void done(List<ParseObject> messages, ParseException e) {
        getActivity().setProgressBarIndeterminateVisibility(false);

     if (e == null){
         //Success
         mMessages = messages;


            String[] usernames = new String[mMessages.size()];
            int i = 0;
            for (ParseObject message : mMessages){
                usernames[i] = message.getString(ParseConstants.KEY_SENDER_NAME);
                i++;
            }
            MessageAdapter adapter = new MessageAdapter(getListView().getContext(), mMessages);
            setListAdapter (adapter);
     }

    }
});

} @Override public void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id);

ParseObject message = mMessages.get(position); String messageType = message.getString(ParseConstants.KEY_FILE_TYPE); ParseFile file = message.getParseFile(ParseConstants.KEY_FILE); Uri fileUri = Uri.parse(file.getUrl());

if(messageType.equals(ParseConstants.TYPE_IMAGE)){
    //view Image
    Intent intent = new Intent (getActivity(), ViewImageActivity.class);
    intent.setData(fileUri);
    startActivity(intent);


}else if(messageType.equals(ParseConstants.TYPE_VIDEO)){

    Intent intent = new Intent (Intent.ACTION_VIEW, fileUri);
    intent.setDataAndType(fileUri, "video/*");
    startActivity(intent);

}else if (messageType.equals(ParseConstants.TYPE_TEXT)){


    //Toast.makeText(getActivity(),  displayMessage, Toast.LENGTH_LONG).show();
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Message from: " + getString(ParseConstants.KEY_SENDER_NAME) + ".");
    builder.setMessage(displayMessage);
    builder.setPositiveButton("Ok",  new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {

        }
    });
    AlertDialog dialog = builder.create();
    dialog.show();
}

}

private String getString(String keySenderName) {
    // TODO Auto-generated method stub
    return null;
}

}

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Lend Kazazi

Lend Kazazi

why is the app not displaying the text