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 org.fdroid.enigtext; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.database.Cursor; import android.os.AsyncTask; 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.AdapterView; import android.widget.CursorAdapter; import android.widget.ListView; import org.fdroid.enigtext.crypto.MasterSecret; import org.fdroid.enigtext.database.DatabaseFactory; import org.fdroid.enigtext.database.loaders.ConversationListLoader; import org.fdroid.enigtext.notifications.MessageNotifier; import org.fdroid.enigtext.recipients.Recipients; import com.actionbarsherlock.app.SherlockListFragment; import com.actionbarsherlock.view.ActionMode; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.actionbarsherlock.widget.SearchView; import java.util.Set; public class ConversationListFragment extends SherlockListFragment implements LoaderManager.LoaderCallbacks<Cursor>, ActionMode.Callback { private ConversationSelectedListener listener; private MasterSecret masterSecret; private ActionMode actionMode; private String queryFilter = ""; private boolean batchMode = false; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) { return inflater.inflate(R.layout.conversation_list_fragment, container, false); } @Override public void onActivityCreated(Bundle bundle) { super.onActivityCreated(bundle); setHasOptionsMenu(true); initializeListAdapter(); initializeBatchListener(); getLoaderManager().initLoader(0, null, this); } @Override public void onAttach(Activity activity) { super.onAttach(activity); this.listener = (ConversationSelectedListener) activity; } @Override public void onPrepareOptionsMenu(Menu menu) { MenuInflater inflater = this.getSherlockActivity().getSupportMenuInflater(); if (this.masterSecret != null) { inflater.inflate(R.menu.conversation_list, menu); initializeSearch((SearchView) menu.findItem(R.id.menu_search).getActionView()); } else { inflater.inflate(R.menu.conversation_list_empty, menu); } super.onPrepareOptionsMenu(menu); } @Override public void onListItemClick(ListView l, View v, int position, long id) { if (v instanceof ConversationListItem) { ConversationListItem headerView = (ConversationListItem) v; Log.w("ConversationListFragment", "Batch mode: " + batchMode); if (!batchMode) { handleCreateConversation(headerView.getThreadId(), headerView.getRecipients(), headerView.getDistributionType()); } else { ConversationListAdapter adapter = (ConversationListAdapter) getListAdapter(); adapter.toggleThreadInBatchSet(headerView.getThreadId()); adapter.notifyDataSetChanged(); } } } public void setMasterSecret(MasterSecret masterSecret) { if (this.masterSecret != masterSecret) { this.masterSecret = masterSecret; initializeListAdapter(); } } private void initializeSearch(SearchView searchView) { searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { @Override public boolean onQueryTextSubmit(String query) { if (isAdded()) { ConversationListFragment.this.queryFilter = query; ConversationListFragment.this.getLoaderManager().restartLoader(0, null, ConversationListFragment.this); return true; } return false; } @Override public boolean onQueryTextChange(String newText) { return onQueryTextSubmit(newText); } }); } private void initializeBatchListener() { getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View v, int position, long id) { ConversationListAdapter adapter = (ConversationListAdapter) getListAdapter(); actionMode = getSherlockActivity().startActionMode(ConversationListFragment.this); batchMode = true; adapter.initializeBatchMode(true); adapter.toggleThreadInBatchSet(((ConversationListItem) v).getThreadId()); adapter.notifyDataSetChanged(); return true; } }); } private void initializeListAdapter() { this.setListAdapter(new ConversationListAdapter(getActivity(), null, masterSecret)); getListView().setRecyclerListener((ConversationListAdapter) getListAdapter()); getLoaderManager().restartLoader(0, null, this); } private void handleDeleteAllSelected() { AlertDialog.Builder alert = new AlertDialog.Builder(getActivity()); alert.setIcon(android.R.drawable.ic_dialog_alert); alert.setTitle(R.string.ConversationListFragment_delete_threads_question); alert.setMessage( R.string.ConversationListFragment_are_you_sure_you_wish_to_delete_all_selected_conversation_threads); alert.setCancelable(true); alert.setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { final Set<Long> selectedConversations = ((ConversationListAdapter) getListAdapter()) .getBatchSelections(); if (!selectedConversations.isEmpty()) { new AsyncTask<Void, Void, Void>() { private ProgressDialog dialog; @Override protected void onPreExecute() { dialog = ProgressDialog.show(getActivity(), getSherlockActivity().getString(R.string.ConversationListFragment_deleting), getSherlockActivity() .getString(R.string.ConversationListFragment_deleting_selected_threads), true, false); } @Override protected Void doInBackground(Void... params) { DatabaseFactory.getThreadDatabase(getActivity()) .deleteConversations(selectedConversations); MessageNotifier.updateNotification(getActivity(), masterSecret); return null; } @Override protected void onPostExecute(Void result) { dialog.dismiss(); if (actionMode != null) { actionMode.finish(); actionMode = null; batchMode = false; } } }.execute(); } } }); alert.setNegativeButton(android.R.string.cancel, null); alert.show(); } private void handleSelectAllThreads() { ((ConversationListAdapter) this.getListAdapter()).selectAllThreads(); } private void handleUnselectAllThreads() { ((ConversationListAdapter) this.getListAdapter()).selectAllThreads(); } private void handleCreateConversation(long threadId, Recipients recipients, int distributionType) { listener.onCreateConversation(threadId, recipients, distributionType); } @Override public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) { return new ConversationListLoader(getActivity(), queryFilter); } @Override public void onLoadFinished(Loader<Cursor> arg0, Cursor cursor) { ((CursorAdapter) getListAdapter()).changeCursor(cursor); } @Override public void onLoaderReset(Loader<Cursor> arg0) { ((CursorAdapter) getListAdapter()).changeCursor(null); } public interface ConversationSelectedListener { public void onCreateConversation(long threadId, Recipients recipients, int distributionType); } @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { MenuInflater inflater = getSherlockActivity().getSupportMenuInflater(); inflater.inflate(R.menu.conversation_list_batch, menu); LayoutInflater layoutInflater = getSherlockActivity().getLayoutInflater(); View actionModeView = layoutInflater.inflate(R.layout.conversation_fragment_cab, null); mode.setCustomView(actionModeView); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { switch (item.getItemId()) { case R.id.menu_select_all: handleSelectAllThreads(); return true; case R.id.menu_delete_selected: handleDeleteAllSelected(); return true; } return false; } @Override public void onDestroyActionMode(ActionMode mode) { ((ConversationListAdapter) getListAdapter()).initializeBatchMode(false); actionMode = null; batchMode = false; } }