Java tutorial
/** * Copyright (C) 2011 Whisper Systems * * 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 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.securecomcode.text; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CheckedTextView; import android.widget.CursorAdapter; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.TextView; import com.actionbarsherlock.app.SherlockListFragment; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.securecomcode.text.contacts.ContactAccessor; import com.securecomcode.text.contacts.ContactAccessor.ContactData; import com.securecomcode.text.contacts.ContactAccessor.NumberData; import com.securecomcode.text.recipients.Recipient; import com.securecomcode.text.recipients.Recipients; import java.util.Collection; import java.util.HashMap; import java.util.LinkedList; import java.util.List; /** * Activity for selecting a list of contacts. Displayed inside * a ContactSelectionActivity tab frame, and ultimately called by * ComposeMessageActivity for selecting a list of destination contacts. * * @author Moxie Marlinspike * */ public class ContactSelectionListFragment extends SherlockListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private final HashMap<Long, ContactData> selectedContacts = new HashMap<Long, ContactData>(); @Override public void onActivityCreated(Bundle icicle) { super.onCreate(icicle); initializeResources(); initializeCursor(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.contact_selection_list_activity, container, false); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.contact_selection_list, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_select_all: handleSelectAll(); return true; case R.id.menu_unselect_all: handleUnselectAll(); return true; } super.onOptionsItemSelected(item); return false; } public List<ContactData> getSelectedContacts() { List<ContactData> contacts = new LinkedList<ContactData>(); contacts.addAll(selectedContacts.values()); return contacts; } private void handleUnselectAll() { selectedContacts.clear(); ((CursorAdapter) getListView().getAdapter()).notifyDataSetChanged(); } private void handleSelectAll() { selectedContacts.clear(); Cursor cursor = null; try { cursor = ContactAccessor.getInstance().getCursorForContactsWithNumbers(getActivity()); while (cursor != null && cursor.moveToNext()) { ContactData contactData = ContactAccessor.getInstance().getContactData(getActivity(), cursor); if (contactData.numbers.isEmpty()) continue; else if (contactData.numbers.size() == 1) addSingleNumberContact(contactData); else addMultipleNumberContact(contactData, null); } } finally { if (cursor != null) cursor.close(); } ((CursorAdapter) getListView().getAdapter()).notifyDataSetChanged(); } private void addSingleNumberContact(ContactData contactData) { selectedContacts.put(contactData.id, contactData); } private void removeContact(ContactData contactData) { selectedContacts.remove(contactData.id); } private void addMultipleNumberContact(ContactData contactData, CheckedTextView textView) { String[] options = new String[contactData.numbers.size()]; int i = 0; for (NumberData option : contactData.numbers) { options[i++] = option.type + " " + option.number; } AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setTitle(R.string.ContactSelectionlistFragment_select_for + " " + contactData.name); builder.setMultiChoiceItems(options, null, new DiscriminatorClickedListener(contactData)); builder.setPositiveButton(android.R.string.ok, new DiscriminatorFinishedListener(contactData, textView)); builder.setOnCancelListener(new DiscriminatorFinishedListener(contactData, textView)); builder.show(); } private void initializeCursor() { setListAdapter(new ContactSelectionListAdapter(getActivity(), null)); this.getLoaderManager().initLoader(0, null, this); } private void initializeResources() { this.getListView().setFocusable(true); } @Override public void onListItemClick(ListView l, View v, int position, long id) { ((ContactItemView) v).selected(); } private class ContactSelectionListAdapter extends CursorAdapter { public ContactSelectionListAdapter(Context context, Cursor c) { super(context, c); } @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { ContactItemView view = new ContactItemView(context); bindView(view, context, cursor); return view; } @Override public void bindView(View view, Context context, Cursor cursor) { ContactData contactData = ContactAccessor.getInstance().getContactData(context, cursor); ((ContactItemView) view).set(contactData); } } private class ContactItemView extends RelativeLayout { private ContactData contactData; private CheckedTextView name; private TextView number; private TextView label; private long id; public ContactItemView(Context context) { super(context); LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); li.inflate(R.layout.contact_selection_list_item, this, true); this.name = (CheckedTextView) findViewById(R.id.name); this.number = (TextView) findViewById(R.id.number); this.label = (TextView) findViewById(R.id.label); } public void selected() { name.toggle(); if (name.isChecked()) { if (contactData.numbers.size() == 1) addSingleNumberContact(contactData); else addMultipleNumberContact(contactData, name); } else { removeContact(contactData); } } public void set(ContactData contactData) { this.contactData = contactData; if (selectedContacts.containsKey(contactData.id)) this.name.setChecked(true); else this.name.setChecked(false); this.name.setText(contactData.name); if (contactData.numbers.isEmpty()) { this.name.setEnabled(false); this.number.setText(""); this.label.setText(""); } else { this.number.setText(contactData.numbers.get(0).number); this.label.setText(contactData.numbers.get(0).type); } } } private class DiscriminatorFinishedListener implements DialogInterface.OnClickListener, DialogInterface.OnCancelListener { private final ContactData contactData; private final CheckedTextView textView; public DiscriminatorFinishedListener(ContactData contactData, CheckedTextView textView) { this.contactData = contactData; this.textView = textView; } public void onClick(DialogInterface dialog, int which) { ContactData selected = selectedContacts.get(contactData.id); if (selected == null && textView != null) { if (textView != null) textView.setChecked(false); } else if (selected.numbers.size() == 0) { selectedContacts.remove(selected.id); if (textView != null) textView.setChecked(false); } if (textView == null) ((CursorAdapter) getListView().getAdapter()).notifyDataSetChanged(); } public void onCancel(DialogInterface dialog) { onClick(dialog, 0); } } private class DiscriminatorClickedListener implements DialogInterface.OnMultiChoiceClickListener { private final ContactData contactData; public DiscriminatorClickedListener(ContactData contactData) { this.contactData = contactData; } public void onClick(DialogInterface dialog, int which, boolean isChecked) { Log.w("ContactSelectionListActivity", "Got checked: " + isChecked); ContactData existing = selectedContacts.get(contactData.id); if (existing == null) { Log.w("ContactSelectionListActivity", "No existing contact data, creating..."); if (!isChecked) throw new AssertionError("We shouldn't be unchecking data that doesn't exist."); existing = new ContactData(contactData.id, contactData.name); selectedContacts.put(existing.id, existing); } NumberData selectedData = contactData.numbers.get(which); if (!isChecked) existing.numbers.remove(selectedData); else existing.numbers.add(selectedData); } } @Override public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) { return ContactAccessor.getInstance().getCursorLoaderForContactsWithNumbers(getActivity()); } @Override public void onLoadFinished(Loader<Cursor> arg0, Cursor cursor) { ((CursorAdapter) getListAdapter()).changeCursor(cursor); } @Override public void onLoaderReset(Loader<Cursor> arg0) { ((CursorAdapter) getListAdapter()).changeCursor(null); } }