回答问题2：

.onSubmit(new MultiSelectDialog.SubmitCallbackListener() {
@Override
public void onSelected(ArrayList<Integer> selectedIds,ArrayList<String> selectedNames,String dataString) {
    //will return list of selected IDS

    for (int i = 0; i < selectedIds.size(); i++) {
        Toast.makeText(MessageComposeActivity.this,"Selected Ids : " + selectedIds.get(i) + "\n" +
                "Selected Names : " + selectedNames.get(i) + "\n" +
                "DataString : " + dataString,Toast.LENGTH_SHORT).show();
        Log.i("KLKL",String.valueOf(selectedIds));
        //Adding tags
        mTagContainerLayout2.addTag(selectedNames.get(i),selectedIds.get(i));

    }

}

@Override
public void onCancel() {
    Log.d("Cancel","Dialog cancelled");

}
});