Java tutorial
/* * TeleStax, Open Source Cloud Communications * Copyright 2011-2015, Telestax Inc and individual contributors * by the @authors tag. * * This program is free software: you can redistribute it and/or modify * under the terms of the GNU Affero General Public License as * published by the Free Software Foundation; either version 3 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> * * For questions related to commercial use licensing, please contact sales@telestax.com. * */ package com.telestax.restcomm_olympus; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.View; import android.widget.ListView; import android.widget.SimpleAdapter; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; public class MessageFragment extends ListFragment { private SimpleAdapter listViewAdapter; private ArrayList<Map<String, String>> contactList; /** * The serialization (saved instance state) Bundle key representing the * activated item position. Only used on tablets. */ private static final String STATE_ACTIVATED_POSITION = "activated_position"; /** * The fragment's current callback object, which is notified of list item * clicks. */ private Callbacks mCallbacks = null; /** * The current activated item position. Only used on tablets. */ private int mActivatedPosition = ListView.INVALID_POSITION; /** * A callback interface that all activities containing this fragment must * implement. This mechanism allows activities to be notified of item * selections. */ public interface Callbacks { /** * Callback for when an item has been selected. */ //public void onItemSelected(HashMap<String, String> contact, ContactSelectionType type); //public void onContactUpdate(HashMap<String, String> contact, int type); } /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public MessageFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); contactList = new ArrayList<Map<String, String>>(); String[] from = { "username", "message-text" }; int[] to = { R.id.message_username, R.id.message_text }; listViewAdapter = new SimpleAdapter(getActivity().getApplicationContext(), contactList, R.layout.message_row_layout, from, to); setListAdapter(listViewAdapter); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); // Restore the previously serialized activated item position. if (savedInstanceState != null && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) { setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION)); } registerForContextMenu(getListView()); } @Override public void onAttach(Activity activity) { super.onAttach(activity); // Activities containing this fragment must implement its callbacks. if (!(activity instanceof Callbacks)) { throw new IllegalStateException("Activity must implement fragment's callbacks."); } mCallbacks = (Callbacks) activity; } @Override public void onDetach() { super.onDetach(); // Reset the active callbacks interface to the dummy implementation. mCallbacks = null; } @Override public void onListItemClick(ListView listView, View view, int position, long id) { super.onListItemClick(listView, view, position, id); // no actions for now when tapping on an item /* HashMap item = (HashMap)getListView().getItemAtPosition(position); // Notify the active callbacks interface (the activity, if the // fragment is attached to one) that an item has been selected. mCallbacks.onItemSelected(item, ContactSelectionType.VIDEO_CALL); */ } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mActivatedPosition != ListView.INVALID_POSITION) { // Serialize and persist the activated item position. outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition); } } /** * Turns on activate-on-click mode. When this mode is on, list items will be * given the 'activated' state when touched. */ public void setActivateOnItemClick(boolean activateOnItemClick) { // When setting CHOICE_MODE_SINGLE, ListView will automatically // give items the 'activated' state when touched. getListView().setChoiceMode(activateOnItemClick ? ListView.CHOICE_MODE_SINGLE : ListView.CHOICE_MODE_NONE); } private void setActivatedPosition(int position) { if (position == ListView.INVALID_POSITION) { getListView().setItemChecked(mActivatedPosition, false); } else { getListView().setItemChecked(position, true); } mActivatedPosition = position; } // Called by Activity when when new message is sent public void addLocalMessage(String message) { HashMap<String, String> item = new HashMap<String, String>(); item.put("username", "Me"); item.put("message-text", message); contactList.add(item); this.listViewAdapter.notifyDataSetChanged(); getListView().setSelection(listViewAdapter.getCount() - 1); } // Called by Activity when when new message is sent public void addRemoteMessage(String message, String username) { HashMap<String, String> item = new HashMap<String, String>(); item.put("username", username); item.put("message-text", message); contactList.add(item); this.listViewAdapter.notifyDataSetChanged(); getListView().setSelection(listViewAdapter.getCount() - 1); } // Helper methods private void showOkAlert(final String title, final String detail) { AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create(); alertDialog.setTitle(title); alertDialog.setMessage(detail); alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); alertDialog.show(); } }