Android - 使用RadioGroup按钮搜索清除BaseAdapter

Question

我有三个由三个按钮组成的无线电组。每个按钮执行不同的搜索。发生的事情是当我首先选择用户进行搜索时，然后我选择场地，然后对用户和场地进行搜索，然后首先显示用户列表并快速切换到场地列表。我怎样才能防止这种情况发生？当我选择下一个单选按钮时，它不应该在搜索上一个按钮时执行并显示两个列表结果。我已经包含了一些代码片段：UserSearch，UserSearch Adapter。 VenueSearchAdapter和VenueSearch完全相同。任何帮助是极大的赞赏。

UserBaseAdapter

public class UserSearchAdapter extends BaseAdapter {

        private LayoutInflater inflater;
        private Context context;

        public UserSearchAdapter(Context context, ArrayList<HashMap<String, String>> searchList) {
            inflater = LayoutInflater.from(context);
            this.context = context;
        }
        public int getCount() {
            return searchList.size();
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public void clearLists() {
            searchList.clear();
            notifyDataSetChanged();
        }


        public View getView(int position, View convertView, ViewGroup parent) {
            inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
            View vi=convertView;
            if(convertView==null)
                vi = inflater.inflate(R.layout.activity_ulist, null);

UserSearch

class UserSearch extends AsyncTask<String, String, String> {

            protected String doInBackground(String... args) {
                //updating UI from Background Thread
                String input = userInput.getText().toString();
                String type = "user";

                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                if(input != ""){
                    params = new ArrayList<NameValuePair>();    
                    params.add(new BasicNameValuePair("userInput",input.concat("%")));
                    params.add(new BasicNameValuePair("searchType", type));
                }
                // getting JSON string from URL
                JSONObject json = jParser.makeHttpRequest(Search_URL, "POST", params);


            /**
             * After completing background task Dismiss the progress dialog
             * **/
            protected void onPostExecute(String file_url) {
                // dismiss the dialog after getting all orders
                //pDialog.dismiss();
                // updating UI from Background Thread
                runOnUiThread(new Runnable() {
                    public void run() {
                        /**
                         * Updating parsed JSON data into ListView
                         * */
                        list = (ListView)getListView().findViewById(android.R.id.list);
                        uadapter=new UserSearchAdapter(SearchButtonActivity.this, searchList);        
                        list.setAdapter(uadapter);
                        if(userInput.length() == 0)
                            list.setAdapter(null);
                    }
                });
            }
        }