android - Main メソッドの android.os.networkexception

Question

以下は私のコードです：

private static final String TAG_TYPE = "movie_type";
private static final String TAG_NAME = "movie_name";
private static final String TAG_LENGTH = "movie_length";
private static final String TAG_SCHEDULES = "movie_schedules";
private static final String TAG_CINEMA = "movie_cinema_number";
private static final String TAG_URL = "movie_image_url";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


            try {

                String readMovieSchedules = readMovieSchedules();

                // Hashmap for ListView
                ArrayList<HashMap<String, String>> movieList = new ArrayList<HashMap<String, String>>();

                JSONArray jsonArray = new JSONArray(readMovieSchedules);
                Log.i(MainActivity.class.getName(),
                    "Number of entries " + jsonArray.length());
                for (int i = 0; i < jsonArray.length(); i++) {
                  JSONObject jsonObject = jsonArray.getJSONObject(i);
                  Log.i(MainActivity.class.getName(), jsonObject.getString("movie_name"));

                  // Storing each json item in variable
                  String name = jsonObject.getString(TAG_NAME);
                  String type = jsonObject.getString(TAG_TYPE);
                  String length = jsonObject.getString(TAG_LENGTH);
                  String cinema = jsonObject.getString(TAG_CINEMA);
                  String schedules = jsonObject.getString(TAG_SCHEDULES);
                  String url = jsonObject.getString(TAG_URL);

                  // creating new HashMap
                  HashMap<String, String> map = new HashMap<String, String>();

                  // adding each child node to HashMap key => value
                  map.put(TAG_NAME, name);
                  map.put(TAG_TYPE, type);
                  map.put(TAG_LENGTH, length);
                  map.put(TAG_CINEMA, cinema);
                  map.put(TAG_SCHEDULES, schedules);
                  map.put(TAG_URL, url);

                  // adding HashList to ArrayList
                  movieList.add(map);

                  //String strURL = TAG_URL.replaceAll(" ", "%20");

                  /**
                   * Updating parsed JSON data into ListView
                   * */
                  ListAdapter adapter = new SimpleAdapter(MainActivity.this, movieList,
                        R.layout.list_item,
                        new String[] { TAG_NAME, TAG_CINEMA, TAG_SCHEDULES }, 
                        new int[] { R.id.name, R.id.cinema, R.id.schedules }); 
                        //new String[] {},
                        //new int[] {});

                  setListAdapter(adapter);
                  // selecting single ListView item
                  ListView lv = getListView();

                  // Launching new screen on Selecting Single ListItem
                  lv.setOnItemClickListener(new OnItemClickListener() {

                      @Override
                      public void onItemClick(AdapterView<?> parent, View view,
                              int position, long id) {
                          // getting values from selected ListItem
                          String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
                          String cost = ((TextView) view.findViewById(R.id.cinema)).getText().toString();
                          String description = ((TextView) view.findViewById(R.id.schedules)).getText().toString();
                          //String url = ((TextView) view.findViewById(R.id.image_)).getText().toString();

                          // Starting new intent
                          Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
                          in.putExtra(TAG_NAME, name);
                          in.putExtra(TAG_CINEMA, cost);
                          in.putExtra(TAG_SCHEDULES, description);
                          //in.putExtra(TAG_URL, url);
                          startActivity(in);
                      }
                  });
                }
            } catch (Exception e) {
              e.printStackTrace();
            }

}

このコードは SDK 8 では動作しますが、17 では動作しません。この問題で立ち往生しています。これをデバッグする方法を知っている人はいますか? よろしくお願いします。ありがとう。