获取对话框内的自定义view

android.content.DialogInterface.OnClickListener ls = new android.content.DialogInterface.OnClickListener(){
LayoutInflater dialogInflater=LayoutInflater.from(OptionsToDo.this);
View layout = dialogInflater.inflate(R.layout.dialog_answer, null);
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
EditText edit = (EditText) layout.findViewById(R.id.answer_edittext);

String ans = edit.getText().toString();

}