Java tutorial
/* * Copyright 2013 The Android Open Source Project * * 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 com.coderdojo.libretalk; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Locale; import java.util.Random; import com.coderdojo.libretalk.network.ILibretalkMessageEventHandler; import com.coderdojo.libretalk.network.LibretalkConnection; import com.coderdojo.libretalk.network.LibretalkMessageReceiver; import com.coderdojo.libretalk.network.LibretalkMessageSender; import com.coderdojo.libretalk.network.LibretalkNetworkException; import com.rabbitmq.client.ShutdownSignalException; import android.app.Activity; import android.app.AlertDialog; import android.app.Fragment; import android.app.FragmentManager; import android.app.SearchManager; import android.content.DialogInterface; import android.content.Intent; import android.content.res.Configuration; import android.content.res.Resources; import android.graphics.Color; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.text.Spannable; import android.text.SpannableString; import android.text.style.ForegroundColorSpan; import android.util.Log; 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.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ImageView; import android.widget.ListView; import android.widget.Toast; /** * This example illustrates a common usage of the DrawerLayout widget * in the Android support library. * <p/> * <p>When a navigation (left) drawer is present, the host activity should detect presses of * the action bar's Up affordance as a signal to open and close the navigation drawer. The * ActionBarDrawerToggle facilitates this behavior. * Items within the drawer should fall into one of two categories:</p> * <p/> * <ul> * <li><strong>View switches</strong>. A view switch follows the same basic policies as * list or tab navigation in that a view switch does not create navigation history. * This pattern should only be used at the root activity of a task, leaving some form * of Up navigation active for activities further down the navigation hierarchy.</li> * <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate * parent for Up navigation. This allows a user to jump across an app's navigation * hierarchy at will. The application should treat this as it treats Up navigation from * a different task, replacing the current task stack using TaskStackBuilder or similar. * This is the only form of navigation drawer that should be used outside of the root * activity of a task.</li> * </ul> * <p/> * <p>Right side drawers should be used for actions, not navigation. This follows the pattern * established by the Action Bar that navigation should be to the left and actions to the right. * An action should be an operation performed on the current contents of the window, * for example enabling or disabling a data overlay on top of the current content.</p> */ public class MainActivity extends Activity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence appName, mTitle; private static CharSequence friendlist; private DBManager datasource; private List<LibretalkUser> userList; private ArrayList<SpannableString> mFriendsListArray; private ArrayList<SpannableString> mMessageListArray; //XXX NETWORKING CODE END private LibretalkConnection connection; private LibretalkMessageReceiver receiver; private LibretalkMessageSender sender; private static final String DEFAULT_NICKNAME = "Anon"; private String nick = DEFAULT_NICKNAME; //XXX NETWORKING CODE END @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); appName = mTitle = getTitle(); getActionBar().setTitle(appName); // Read the User data from the database datasource = new DBManager(this); datasource.open(); userList = datasource.getAllUsers(); mFriendsListArray = new ArrayList<SpannableString>(); mMessageListArray = new ArrayList<SpannableString>(); for (int i = 0; i < userList.size(); i++) { mFriendsListArray.add(new SpannableString(userList.get(i).getProfile().getName())); } mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); friendlist = getResources().getString(R.string.friendlist); // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener mDrawerList .setAdapter(new ArrayAdapter<SpannableString>(this, R.layout.drawer_list_item, mFriendsListArray)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getActionBar().setTitle(friendlist); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(appName); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { setTitle(friendlist); selectItem(0); } //XXX NETWORKING CODE BEGIN //[!] TODO: This is configured to use Android's localhost. Change the host value to whatever our server's address is. Random randomGenerator = new Random(); long tempuserhash = randomGenerator.nextLong(); String host = getString(R.string.ipaddress); Log.v("Libretalk", host); String user = getString(R.string.rabbituser); Log.v("Libretalk", user); String password = getString(R.string.rabbitpassword); Log.v("Libretalk", password); this.connection = new LibretalkConnection(host, user, password, tempuserhash); final ILibretalkMessageEventHandler eventHandler = new ILibretalkMessageEventHandler() { @Override public void onMessageReceived(final LibretalkMessageData message) { try { //printMsg(message.getSenderTag() + ": " + message.getData()); printMsg(message); } catch (Exception ex) { showErrDialog("Fatal Error! - " + ex.getClass().getSimpleName(), "An error has occurred while attempting to proccess a message from " + message.getSenderTag() + ".\n " + ex.getMessage(), ":'("); } } @Override public void onDisconnect(final Exception ex) { showErrDialog("Disconnected! - " + ex.getClass().getSimpleName(), "A network error has occurred and you have been disconnected! " + "Please check you are connected to the internet.", ":("); } }; this.receiver = new LibretalkMessageReceiver(this.connection, eventHandler); this.sender = new LibretalkMessageSender(this.connection); try { this.connection.connect(); this.receiver.startConsuming(); } catch (LibretalkNetworkException ex) { this.showErrDialog("Connection failure - " + ex.getClass().getSimpleName(), "Unfortunately, an error has occurred and we were unable to connect you to" + "the Libretalk Network, please check you are connected to the internet.", ":("); ex.printStackTrace(); return; } //XXX NETWORKING CODE END } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } /* Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // If the nav drawer is open, hide action items related to the content view boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action buttons switch (item.getItemId()) { case R.id.action_addfriend: Fragment fragment = new AddFriendFragment(); Bundle args = new Bundle(); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); return true; case R.id.action_websearch: // create intent to perform web search for this planet Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); intent.putExtra(SearchManager.QUERY, getActionBar().getTitle()); // catch event that there's no activity to handle intent if (intent.resolveActivity(getPackageManager()) != null) { startActivity(intent); } else { Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); } return true; default: return super.onOptionsItemSelected(item); } } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } private void selectItem(int position) { // update the main content by replacing fragments Fragment fragment = new BackgroundFragment(); Bundle args = new Bundle(); args.putInt(BackgroundFragment.ARG_BACKGROUND, position); fragment.setArguments(args); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } @Override public void onPause() { super.onPause(); // Always call the superclass method first datasource.close(); //XXX NETWORKING CODE BEGIN if (this.connection.getStatus() == LibretalkConnection.ConnectionStatus.CONNECTED) { try { this.connection.close(); } catch (IOException ex) { ex.printStackTrace(); } catch (ShutdownSignalException sig) { Log.w("libretalk::LibretalkConnection", "Caught shutdownSignal while attempting to close Channel:"); Log.w("libretalk::LibretalkConnection", "\t[== " + sig.getMessage() + "==]"); Log.w("libretalk::LibretalkConnection", "\tHard Error : " + sig.isHardError()); Log.w("libretalk::LibretalkConnection", "\tReason : " + sig.getReason()); } } //XXX NETWORKING CODE END } @Override public void onResume() { super.onResume(); // Always call the superclass method first datasource.open(); //XXX NETWORKING CODE BEGIN if (this.connection.getStatus() == LibretalkConnection.ConnectionStatus.NOT_CONNECTED) { try { this.connection.connect(); this.receiver.startConsuming(); } catch (LibretalkNetworkException ex) { this.showErrDialog("Connection failure - " + ex.getClass().getSimpleName(), "Unfortunately, an error has occurred and we were unable to connect you to" + "the Libretalk Network, please check you are connected to the internet.", ":("); } } //XXX NETWORKING CODE END } public void addMessage(View view) { EditText messageEditText = (EditText) findViewById(R.id.edit_message); String message = messageEditText.getText().toString(); messageEditText.setText(""); ArrayAdapter<SpannableString> adapter = new ArrayAdapter<SpannableString>(this, android.R.layout.simple_list_item_1, mMessageListArray); ListView listView = (ListView) findViewById(R.id.message_list); listView.setAdapter(adapter); listView.setStackFromBottom(true); //mMessageListArray.add(new String(message)); //adapter.notifyDataSetChanged(); //XXX NETWORKING CODE BEGIN if (!message.isEmpty()) { if (message.startsWith(".nick")) { this.nick = message.substring(5); printMsg("\t >> Changed your nickname to " + this.nick); return; } final LibretalkMessageData data = new LibretalkMessageData(this.nick, message); this.sender.send(LibretalkMessageData.serialize(data).getBytes(), this.connection.getUserTag()); } //XXX NETWORKING CODE END } //XXX NETWORKING CODE BEGIN private final void printMsg(final String message) { ArrayAdapter<SpannableString> adapter = new ArrayAdapter<SpannableString>(this, android.R.layout.simple_list_item_1, mMessageListArray); ListView listView = (ListView) findViewById(R.id.message_list); listView.setAdapter(adapter); listView.setStackFromBottom(true); mMessageListArray.add(new SpannableString(message)); adapter.notifyDataSetChanged(); } private final void printMsg(final LibretalkMessageData message) { ArrayAdapter<SpannableString> adapter = new ArrayAdapter<SpannableString>(this, android.R.layout.simple_list_item_1, mMessageListArray); ListView listView = (ListView) findViewById(R.id.message_list); listView.setAdapter(adapter); listView.setStackFromBottom(true); final String sourceMessage = message.getSenderTag() + ": " + message.getData(); final SpannableString formattedText = new SpannableString(sourceMessage); if (message.getData().startsWith(">")) { formattedText.setSpan( new ForegroundColorSpan(LibretalkMessageData.getColorFromString(message.getSenderTag())), sourceMessage.indexOf(message.getSenderTag()), sourceMessage.indexOf(message.getSenderTag()) + message.getSenderTag().length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); formattedText.setSpan(new ForegroundColorSpan(Color.rgb(120, 153, 34)), sourceMessage.indexOf(message.getData()), sourceMessage.indexOf(message.getData()) + message.getData().length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } else { formattedText.setSpan( new ForegroundColorSpan(LibretalkMessageData.getColorFromString(message.getSenderTag())), sourceMessage.indexOf(message.getSenderTag()), sourceMessage.indexOf(message.getSenderTag()) + message.getSenderTag().length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } mMessageListArray.add(formattedText); adapter.notifyDataSetChanged(); } private final void showErrDialog(final String title, final String msg, final String buttonText) { final AlertDialog.Builder bob = new AlertDialog.Builder(this); // TODO replace hardcoded strings with Android Resources. bob.setTitle(title); bob.setMessage(msg); bob.setNeutralButton(buttonText, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).show(); } //XXX NETWORKING CODE END public void addFriend(View view) { EditText firstNameEditText = (EditText) findViewById(R.id.first_name); String firstName = firstNameEditText.getText().toString(); firstNameEditText.setText(""); // Ignore if the box is empty if (firstName.equals("")) { Toast.makeText(getBaseContext(), "You must enter a name first!", Toast.LENGTH_LONG).show(); return; } if (mFriendsListArray.contains(new String(firstName))) { Toast.makeText(getBaseContext(), "You already have this friend!", Toast.LENGTH_LONG).show(); return; } mFriendsListArray.add(new SpannableString(firstName)); LibretalkUser user = new LibretalkUser(); user.getProfile().setName(firstName); this.datasource.insertUser(firstName, "", "", 0l); if (mFriendsListArray.get(0).equals("No friends yet, why not add some!")) { this.mFriendsListArray.remove(0); } mDrawerList .setAdapter(new ArrayAdapter<SpannableString>(this, R.layout.drawer_list_item, mFriendsListArray)); } public void addFriendConfirmation(final View item) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(R.string.addfriend).setTitle(R.string.addfriend); builder.setNegativeButton(R.string.cancel_button, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User cancelled the dialog } }); builder.setPositiveButton(R.string.ok_button, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User clicked OK button addFriend(item); } }); AlertDialog dialog = builder.create(); dialog.show(); } public void deleteFriend(String friend) { mFriendsListArray.remove(friend); mDrawerList .setAdapter(new ArrayAdapter<SpannableString>(this, R.layout.drawer_list_item, mFriendsListArray)); Toast.makeText(getBaseContext(), "Friend Removed", Toast.LENGTH_LONG).show(); } public void displayDeleteFriendConfirmation(final String item) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(R.string.delete_dialog_title).setTitle(R.string.delete_dialog_title); builder.setNegativeButton(R.string.cancel_button, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User cancelled the dialog } }); builder.setPositiveButton(R.string.ok_button, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User clicked OK button deleteFriend(item); } }); AlertDialog dialog = builder.create(); dialog.show(); } /** * Fragment that appears in the "content_frame", shows a planet */ public static class BackgroundFragment extends Fragment { public static final String ARG_BACKGROUND = ""; public BackgroundFragment() { // Empty constructor required for fragment subclasses } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_background, container, false); int i = getArguments().getInt(ARG_BACKGROUND); int imageResourceArraySize = getResources() .getStringArray(R.array.librechat_background_image_array).length; if (i >= imageResourceArraySize) { i = (int) (Math.random() * imageResourceArraySize); } String background = getResources().getStringArray(R.array.librechat_background_image_array)[i]; int imageId = getResources().getIdentifier(background.toLowerCase(Locale.getDefault()), "drawable", getActivity().getPackageName()); ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId); //getActivity().setTitle(planet); return rootView; } } /** * Fragment that appears in the "content_frame", shows a planet */ public static class AddFriendFragment extends Fragment { public AddFriendFragment() { // Empty constructor required for fragment subclasses } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_add_friend, container, false); return rootView; } } }