Question

我正在开发一个应用程序，我需要能够将一个位置列表加载到ListView中，然后让用户选择一个位置，然后确定用户体验的其余部分。

目前我有一个从JSON请求中提取的位置列表，我可以轻松地将信息显示到ListView中 - 我遇到的问题是将相同的列表转换为某种形式的列表，用户只能选择一个地点。如果它是单选按钮列表或微调器，我个人没有偏好。我过去一周在网上的教程中一直在尝试各种方法，但是我永远无法使用我当前的检索和存储列表的方法，所以我终于有机会结束并寻找一些指导。我是java / android编程的新手，所以我知道我缺乏经验可能是最值得责备的。所以我想如果有人能够至少指出我正确的方向，那么我就不会在需要大量重新工作的解决方案上转动我的车轮，那么我会非常感激！

下面是我当前的活动，它检索JSON并将其打成标准ListView - 我将它存储到数据库中，以便在应用程序的行下方使用。

public class SQLiteJSONParsing extends ListActivity {

private ProgressDialog pDialog;

//////////////////////// JSON URL //////////////////////////

private static String url = "http://my/link/to/json";

//////////////////////// JSON Node Names //////////////////////////

private static final String TAG_CONTACTS = "contacts";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_CON_POSITION = "con_position";
private static final String TAG_ADDRESS = "address";
private static final String TAG_SUBURB = "suburb";
private static final String TAG_STATE = "state";
private static final String TAG_POSTCODE = "postcode";
private static final String TAG_TELEPHONE = "telephone";
private static final String TAG_EMAIL_TO = "email_to";

//////////////////////// JSON Array //////////////////////////

JSONArray contacts = null;
private DatabaseHelper databaseHelper;

//////////////////////// HashMap ListView //////////////////////////

ArrayList<HashMap<String, String>> locationsList;

///////////////////////// Start onCreate method ////////////////////////////

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.first_launch_options);
    databaseHelper = new DatabaseHelper(SQLiteJSONParsing.this);        

        locationsList = new ArrayList<HashMap<String, String>>();

        //////////////////////// Skip Button //////////////////////////

        Button cancel = (Button)findViewById(R.id.cancel);
        cancel.setOnClickListener(new OnClickListener() 
        {   public void onClick(View v) 
            {   
                Intent locationList = new Intent(SQLiteJSONParsing.this, MainActivity.class);
                    startActivity(locationList);
                    finish();
            }
        });         

        //////////////////////// Start ASYNC //////////////////////////

        new GetLocations().execute();
    }

        //////////////////////// ASYNC HTTP Call //////////////////////////

    private class GetLocations extends AsyncTask<Void, Void, Void> {

        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(SQLiteJSONParsing.this);
            pDialog.setMessage("Loading Locations...");
            pDialog.setCancelable(true);
            pDialog.show();
        }

        //////////////////////// Start Background Service Handler & Load the DB //////////////////////////

        protected Void doInBackground(Void... arg0) {
            // Creating service handler class instance
            LocationsFeedServiceHandler sh = new LocationsFeedServiceHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url, LocationsFeedServiceHandler.GET);

            Log.d("Response: ", "> " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    //////////////////////// Get the JSON Node Array //////////////////////////

                    contacts = jsonObj.getJSONArray(TAG_CONTACTS);

                    //////////////////////// Loop Through the Results //////////////////////////

                    for (int i = 0; i < contacts.length(); i++) {
                        JSONObject c = contacts.getJSONObject(i);

                        String id = c.getString(TAG_ID);
                        String name = c.getString(TAG_NAME);
                        String con_position = c.getString(TAG_CON_POSITION);
                        String address = c.getString(TAG_ADDRESS);
                        String suburb = c.getString(TAG_SUBURB);
                        String state = c.getString(TAG_STATE);
                        String postcode = c.getString(TAG_POSTCODE);
                        String telephone = c.getString(TAG_TELEPHONE);
                        String email_to = c.getString(TAG_EMAIL_TO);

                        //////////////////////// Save Records to DB //////////////////////////

                        databaseHelper.saveTableRecord(id, name, con_position, address, suburb, state, postcode, telephone, email_to);

                        //////////////////////// Single Items HashMap //////////////////////////

                        HashMap<String, String> items = new HashMap<String, String>();

                        //////////////////////// Add Items to the HashMap //////////////////////////

                        items.put(TAG_ID, id);
                        items.put(TAG_NAME, name);
                        items.put(TAG_CON_POSITION, con_position);
                        items.put(TAG_ADDRESS, address);
                        items.put(TAG_SUBURB, suburb);
                        items.put(TAG_STATE, state);
                        items.put(TAG_POSTCODE, postcode);
                        items.put(TAG_TELEPHONE, telephone);
                        items.put(TAG_EMAIL_TO, email_to);

                        //////////////////////// Add Items to the LocationsList //////////////////////////

                        locationsList.add(items);
                    }

                    //////////////////////// Capture Exceptions //////////////////////////

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e("LocationsFeedServiceHandler", "Couldn't get any data from the url");
            }

            return null;
        }

        //////////////////////// Close Progress Dialog //////////////////////////

        protected void onPostExecute(Void location_result) {
            super.onPostExecute(location_result);
            // Dismiss the progress dialog
            if (pDialog.isShowing())
                pDialog.dismiss();


            //////////////////////// Update the Parsed JSON into the ListAdapter //////////////////////////

            ListAdapter locations_adapter = new SimpleAdapter(
                    SQLiteJSONParsing.this, locationsList,
                    R.layout.first_launch_locations_detail, 
                    new String[] { TAG_NAME }, 
                    new int[] { R.id.name });

            setListAdapter(locations_adapter);

    }

}

Answer 1

我使用了以下示例代码，我需要从列表视图中选择单个项目。

http://amitandroid.blogspot.in/2013/03/android-custon-single-choice-lsitview.html

自定义ListView具有单选选项和动态数据

1 个答案: