Java tutorial
/* Copyright (C) 2014 Marc Delerue This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package com.aikidonord.fragments; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.FragmentManager; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import com.aikidonord.R; import com.aikidonord.display.LieuAdapter; import com.aikidonord.utils.JSONRequest; import com.aikidonord.utils.VerifConnexion; import org.json.JSONArray; import org.json.JSONObject; import java.lang.ref.WeakReference; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Locale; public class FragmentLieu extends ListFragment { private WeakReference<QueryForLieuTask> asyncTaskWeakRef; // occurence de l'interface qui va communiquer avec l'activit private OnLieuSelectedListener mCallback; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); View view = inflater.inflate(R.layout.fragment_lieu, null /*container, false*/); View rlLoading = view.findViewById(R.id.loadingPanel); //View listView = view.getListView(); if (VerifConnexion.isOnline(this.getActivity())) { rlLoading.setVisibility(View.VISIBLE); // on va fair l'impasse l dessus vu que je ne suis pas bien sr // de la manire dont il faut oprer tant que la vue n'a pas t renvoye. //listView.setVisibility(View.GONE); this.lancementAsync(); } else { AlertDialog alertDialog = new AlertDialog.Builder(this.getActivity()).create(); alertDialog.setTitle(getResources().getString(R.string.app_name)); alertDialog.setMessage(getResources().getString(R.string.no_network)); alertDialog.setIcon(R.drawable.ic_launcher); alertDialog.setCancelable(false); alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, getResources().getString(R.string.close), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // if this button is clicked, close // current activity FragmentLieu.this.getActivity().finish(); } }); alertDialog.show(); } return view; } @Override /** * Au clic sur un lment de la liste. */ public void onListItemClick(ListView l, View v, int position, long id) { String lieu = (String) l.getItemAtPosition(position); FragmentManager fm = getFragmentManager(); if (fm.findFragmentById(R.id.fragment_prochains_stages) != null) { // affichage tablette mCallback.onLieuSelected(lieu); } else { // dans le cas de l'affichage tlphone classique Intent i = new Intent(this.getActivity(), com.aikidonord.ProchainsStages.class); // donnes envoyer l'activit Bundle b = new Bundle(); b.putString("type", "lieu"); b.putString("data", String.valueOf(lieu)); i.putExtras(b); this.getActivity().startActivity(i); } } // Container Activity must implement this interface public interface OnLieuSelectedListener { public void onLieuSelected(String lieu); } @Override public void onAttach(Activity activity) { super.onAttach(activity); // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception try { mCallback = (OnLieuSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnLieuSelectedListener"); } } /** * Das subtilit pour faire de l'async dans des fragments */ private void lancementAsync() { QueryForLieuTask asyncTask = new QueryForLieuTask(this); this.asyncTaskWeakRef = new WeakReference<QueryForLieuTask>(asyncTask); asyncTask.execute(this); } /** * Async * * @author Marc Delerue */ private static class QueryForLieuTask extends AsyncTask<Object, Void, ArrayList<String>> { private Activity act; private Context context; private ListFragment lFragment; private WeakReference<FragmentLieu> fragmentWeakRef; /** * Et oui, il y a un constructeur... * * @param fragment */ private QueryForLieuTask(FragmentLieu fragment) { this.fragmentWeakRef = new WeakReference<FragmentLieu>(fragment); } protected ArrayList<String> doInBackground(Object... o) { this.lFragment = (ListFragment) o[0]; this.act = this.lFragment.getActivity(); this.context = this.lFragment.getActivity().getApplicationContext(); ArrayList<String> listeLieu = this.parseJSON(this.startQuerying()); return listeLieu; } public JSONObject startQuerying() { JSONRequest jr = new JSONRequest(); String from = this.act.getResources().getString(R.string.api_param_from); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.FRANCE); from += "=" + sdf.format(new java.util.Date()); String url = this.act.getResources().getString(R.string.api_lieux_json); JSONObject jo = jr.getJSONFromUrl(url + "?" + from); return jo; } //Parse le retour JSON de l'api public ArrayList<String> parseJSON(JSONObject jsonObject) { ArrayList<String> l = new ArrayList<String>(); try { JSONArray array = jsonObject.getJSONArray("lieux"); if (array != null) { for (int i = 0; i < array.length(); i++) { String type = array.getString(i); l.add(type); } // fin parcours JSONArray } } catch (Exception _e) { } return l; } protected void onProgressUpdate(Integer... progress) { // setProgressPercent(progress[0]); } // // Excution la fin du traitement // protected void onPostExecute(ArrayList<String> lLieu) { // Create items for the ListView LieuAdapter adapter = new LieuAdapter(this.context, R.layout.searchitem_lieu, lLieu, this.act); // on change l'affichage this.act.findViewById(R.id.loadingPanel).setVisibility(View.GONE); this.lFragment.getListView().setVisibility(View.VISIBLE); // specify the list adaptor this.lFragment.getListView().setAdapter(adapter); } } // fin async }