Przerwa międzyświąteczna sprzyja powstawaniu kodu. Udało mi się zamienić prowizorycznego klienta na takiego bardziej profesjonalnego.
Postanowiłam wykorzystać to, czego uczę się na szkoleniu Udacity – RecyclerView z ViewHolderem 🙂
W tym momencie mój layout activity_main.xml trochę się zmienił, bo zamiast pojedynczego textView do wyświetlenia JSON-a ma teraz RecyclerView:
| <android.support.v7.widget.RecyclerView | |
| android:id="@+id/route_list_rv" | |
| android:layout_width="match_parent" | |
| android:layout_height="wrap_content" /> |
który to przyjął do siebie już konkretne pola, które będę wyświetlać i wygląda teraz tak:
| <?xml version="1.0" encoding="utf-8"?> | |
| <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
| android:layout_width="match_parent" | |
| android:layout_height="@dimen/text_view_height" | |
| android:layout_marginStart="@dimen/margin"> | |
| <TextView | |
| android:id="@+id/bus_tv" | |
| android:layout_width="@dimen/bus_column_size" | |
| android:layout_height="match_parent" /> | |
| <TextView | |
| android:id="@+id/leave_tv" | |
| android:layout_width="@dimen/column_size" | |
| android:layout_height="match_parent" /> | |
| <TextView | |
| android:id="@+id/on_the_spot_tv" | |
| android:layout_width="@dimen/column_size" | |
| android:layout_height="match_parent" /> | |
| <TextView | |
| android:id="@+id/transfer_tv" | |
| android:layout_width="@dimen/column_size" | |
| android:layout_height="match_parent" /> | |
| </LinearLayout> |
Zasilanie adaptera danymi i podpinanie go do RecyclerView odbywa się w metodzie onPostExecute w AsyncTasku:
| protected void onPostExecute(String s) { | |
| super.onPostExecute(s); | |
| if (s != null) { | |
| try { | |
| JSONArray scheduleJsonList = new JSONArray(s); | |
| RoutesAdapter mAdapter = new RoutesAdapter(scheduleJsonList); | |
| mRoutesList.setAdapter(mAdapter); | |
| } catch (JSONException e) { | |
| Log.e(TAG, e.getMessage()); | |
| } | |
| } | |
| } |
A sam ViewHolder trzymający pola wygląda następująco:
| class RouteViewHolder extends RecyclerView.ViewHolder { | |
| TextView busTextView = null; | |
| TextView leaveTextView = null; | |
| TextView onTheSpotTextView = null; | |
| TextView transferTextView = null; | |
| RouteViewHolder(View itemView) { | |
| super(itemView); | |
| busTextView = itemView.findViewById(R.id.bus_tv); | |
| leaveTextView = itemView.findViewById(R.id.leave_tv); | |
| onTheSpotTextView = itemView.findViewById(R.id.on_the_spot_tv); | |
| transferTextView = itemView.findViewById(R.id.transfer_tv); | |
| } | |
| void bind(int listIndex) { | |
| try { | |
| JSONObject routeObject = (JSONObject) mItems.get(listIndex); | |
| busTextView.setText(routeObject.getJSONArray("bus").join(" | ").replaceAll("\"", "")); | |
| leaveTextView.setText(routeObject.get("leave").toString()); | |
| onTheSpotTextView.setText(routeObject.get("on_the_spot").toString()); | |
| if (routeObject.has("transfer")) { | |
| transferTextView.setText(routeObject.get("transfer").toString()); | |
| } else { | |
| transferTextView.setText(""); | |
| } | |
| } catch (JSONException e) { | |
| Log.e(TAG, e.getMessage()); | |
| } | |
| } | |
| } |
Ostatnim puzzlem w tej układance jest sam RecyclerView:
| public class RoutesAdapter extends RecyclerView.Adapter<RoutesAdapter.RouteViewHolder> { | |
| private static final String TAG = RoutesAdapter.class.getSimpleName(); | |
| private JSONArray mItems; | |
| RoutesAdapter(JSONArray routes) { | |
| mItems = routes; | |
| } | |
| @Override | |
| public RouteViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { | |
| Context context = viewGroup.getContext(); | |
| int layoutIdForListItem = R.layout.route_list_item; | |
| LayoutInflater inflater = LayoutInflater.from(context); | |
| View view = inflater.inflate(layoutIdForListItem, viewGroup, false); | |
| return new RouteViewHolder(view); | |
| } | |
| @Override | |
| public void onBindViewHolder(RouteViewHolder holder, int position) { | |
| holder.bind(position); | |
| } | |
| @Override | |
| public int getItemCount() { | |
| return mItems.length(); | |
| } | |
| class RouteViewHolder extends RecyclerView.ViewHolder { | |
| (…) | |
| } | |
| } |
W efekcie pozbyłam się smutnego JSON-a, a zyskałam przejściowo smutną tabelkę:
