Java tutorial
/* * Copyright [2016] [UFMS] * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package ufms.br.com.ufmsapp.fragment; import android.app.SearchManager; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.support.v4.content.ContextCompat; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.SearchView; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import java.util.ArrayList; import ufms.br.com.ufmsapp.MyApplication; import ufms.br.com.ufmsapp.R; import ufms.br.com.ufmsapp.activity.DetalhesEventoActivity; import ufms.br.com.ufmsapp.adapter.EventosAdapter; import ufms.br.com.ufmsapp.callbacks.EventosLoadedListener; import ufms.br.com.ufmsapp.pojo.Disciplina; import ufms.br.com.ufmsapp.pojo.Evento; import ufms.br.com.ufmsapp.pojo.EventoRead; import ufms.br.com.ufmsapp.preferences.UserSessionPreference; import ufms.br.com.ufmsapp.task.TaskLoadEventos; import ufms.br.com.ufmsapp.task.TaskLoadMateriais; import ufms.br.com.ufmsapp.task.TaskLoadMatriculas; import ufms.br.com.ufmsapp.utils.ConnectionUtils; import ufms.br.com.ufmsapp.utils.Constants; public class EventosFragment extends Fragment implements EventosLoadedListener, SwipeRefreshLayout.OnRefreshListener, EventosAdapter.OnEventClickListener, SearchView.OnQueryTextListener { public static boolean mIsInForegroundMode; protected EventosAdapter adapter; protected SwipeRefreshLayout swipeRefreshLayout; protected RecyclerView mRecyclerEventos; protected static TextView messageConnectionError; protected static ImageView iconConnectionError; protected ArrayList<Evento> eventos; public static View view; private NetworkChangeReceiver receiver; protected boolean isConnected = false; protected static ProgressBar listEventosProgressBar; private TaskLoadEventos mTask; private IntentFilter filter; public static final String EVENTO_EXTRA = "evento"; public static final String STATE_EVENTOS = "state_evento"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION); receiver = new NetworkChangeReceiver(); } @Override public void onResume() { super.onResume(); getActivity().registerReceiver(receiver, filter); getActivity().registerReceiver(mMessageReceiver, new IntentFilter(Constants.UPDATE_EVENTO_INTENT)); adapter.notifyDataSetChanged(); mIsInForegroundMode = true; } @Override public void onPause() { super.onPause(); getActivity().unregisterReceiver(receiver); getActivity().unregisterReceiver(mMessageReceiver); mIsInForegroundMode = false; } public static boolean isInForeground() { return mIsInForegroundMode; } public static EventosFragment newInstance() { return new EventosFragment(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); getActivity().getMenuInflater().inflate(R.menu.eventos_list_menu, menu); SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE); SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView(); searchView.setOnQueryTextListener(this); searchView.setQueryHint(getString(R.string.txt_busca)); searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName())); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); switch (id) { case R.id.action_calendar_view: FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.main_layout_container, FragmentEventCalendarView.newInstance()); fragmentTransaction.commit(); break; } return super.onOptionsItemSelected(item); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { setHasOptionsMenu(true); view = inflater.inflate(R.layout.fragment_eventos_layout, container, false); //getActivity().invalidateOptionsMenu(); listEventosProgressBar = (ProgressBar) view.findViewById(R.id.progress_bar_list_eventos); eventos = new ArrayList<>(); mRecyclerEventos = (RecyclerView) view.findViewById(R.id.recycler_eventos); messageConnectionError = (TextView) view.findViewById(R.id.txt_volley_error); iconConnectionError = (ImageView) view.findViewById(R.id.no_connection_icon); iconConnectionError.setColorFilter(ContextCompat.getColor(getActivity(), R.color.no_connection_msg)); swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_eventos); swipeRefreshLayout.setOnRefreshListener(this); swipeRefreshLayout.setColorSchemeResources(R.color.green, R.color.blue, R.color.yellow); // if (OrientationUtils.isPortrait(getResources().getConfiguration())) { mRecyclerEventos.setLayoutManager(new LinearLayoutManager(getActivity())); // } else { // mRecyclerEventos.setLayoutManager(new GridLayoutManager(getActivity(), 2)); // } adapter = new EventosAdapter(getActivity()); if (savedInstanceState != null) { eventos = savedInstanceState.getParcelableArrayList(STATE_EVENTOS); adapter.setEventosList(eventos); } else { UserSessionPreference prefs = new UserSessionPreference(getActivity()); ArrayList<Disciplina> disciplinas = new ArrayList<>(); if (!prefs.isFirstTime()) { disciplinas = MyApplication.getWritableDatabase().listarDisciplinas( MyApplication.getWritableDatabase().alunoByEmail(prefs.getEmail()).getAlunoIdServidor()); } for (int i = 0; i < disciplinas.size(); i++) { eventos.addAll(MyApplication.getWritableDatabase() .listarEventos(disciplinas.get(i).getIdDisciplinaServidor())); } adapter.setEventosList(eventos); if (eventos.isEmpty()) { if (ConnectionUtils.hasConnection(getActivity())) { mTask = new TaskLoadEventos(this, listEventosProgressBar, false, messageConnectionError, iconConnectionError); mTask.execute(); } else { showConnectionErrorMessage(); } } } updateList(); return view; } private boolean isEventosListEmpty() { return eventos.isEmpty(); } /*@Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); *//* if (eventos.isEmpty()) { if (mTask == null) { mTask = new TaskLoadEventos(this, listEventosProgressBar, false, messageConnectionError, iconConnectionError); mTask.execute(); } } else { updateList(); }*//* }*/ private void checkAdapterIsEmpty() { // Toast.makeText(getContext(), "Adapter Size => " + adapter.getItemCount(), Toast.LENGTH_LONG).show(); if (adapter.getItemCount() == 0) { //Toast.makeText(getContext(), "Code is here", Toast.LENGTH_LONG).show(); iconConnectionError.setVisibility(View.VISIBLE); messageConnectionError.setVisibility(View.VISIBLE); messageConnectionError.setText(R.string.txt_sem_eventos_lista); } else { iconConnectionError.setVisibility(View.GONE); messageConnectionError.setVisibility(View.GONE); } } protected void setupRecyclerView() { adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() { @Override public void onChanged() { super.onChanged(); checkAdapterIsEmpty(); } }); checkAdapterIsEmpty(); } public void updateList() { adapter.setListener(this); mRecyclerEventos.setAdapter(adapter); setupRecyclerView(); } public static void showConnectionErrorMessage() { final Snackbar snackbar = Snackbar.make(view.findViewById(R.id.root_layout), R.string.txt_no_connection_msg, Snackbar.LENGTH_LONG); snackbar.setAction(R.string.txt_retry_connection, new View.OnClickListener() { @Override public void onClick(View v) { if (ConnectionUtils.hasConnection(MyApplication.getAppContext())) { snackbar.dismiss(); } else { showConnectionErrorMessage(); } } }).show(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putParcelableArrayList(STATE_EVENTOS, eventos); } @Override public void onEventosLoaded(ArrayList<Evento> listEventos) { if (swipeRefreshLayout != null) { if (swipeRefreshLayout.isRefreshing()) { swipeRefreshLayout.setRefreshing(false); } } if (!listEventos.isEmpty()) { adapter.setEventosList(listEventos); updateList(); } else { checkAdapterIsEmpty(); } } @Override public void onRefresh() { if (ConnectionUtils.hasConnection(getActivity())) { //sincroniza matriculas new TaskLoadMatriculas().execute(); //sincroniza uploads new TaskLoadMateriais().execute(); mTask = new TaskLoadEventos(this, listEventosProgressBar, true, messageConnectionError, iconConnectionError); mTask.execute(); } else { showConnectionErrorMessage(); swipeRefreshLayout.setRefreshing(false); } } @Override public void onEventClick(View v, int position, Evento evento) { MyApplication.getWritableDatabase().updateEventoRead(new EventoRead(1, evento.getIdEventoServidor())); Intent intent = new Intent(getActivity(), DetalhesEventoActivity.class); intent.putExtra(EVENTO_EXTRA, evento); startActivity(intent); } private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent != null) { onRefresh(); } } }; @Override public boolean onQueryTextSubmit(String query) { return false; } @Override public boolean onQueryTextChange(String newText) { final ArrayList<Evento> resultList = filter(eventos, newText); adapter.setEventosList(resultList); updateList(); return true; } private ArrayList<Evento> filter(ArrayList<Evento> eventos, String query) { query = query.toLowerCase(); final ArrayList<Evento> filteredEventos = new ArrayList<>(); for (Evento evento : eventos) { final String text = evento.getTitulo().toLowerCase(); if (text.contains(query)) { filteredEventos.add(evento); } } return filteredEventos; } public class NetworkChangeReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, final Intent intent) { isNetworkAvailable(context); } private boolean isNetworkAvailable(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); if (activeNetInfo != null && activeNetInfo.isConnected()) { isConnected = true; //getActivity().invalidateOptionsMenu(); if (isEventosListEmpty()) { mTask = new TaskLoadEventos(EventosFragment.this, listEventosProgressBar, false, messageConnectionError, iconConnectionError); mTask.execute(); } } isConnected = false; //getActivity().invalidateOptionsMenu(); return false; } } }