anotherim/src/main/java/eu/siacs/conversations/ui/ChooseContactActivity.java

package eu.siacs.conversations.ui;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.AdapterView;
import android.widget.ListView;

import java.util.Set;
import java.util.HashSet;
import java.util.Collections;
import java.util.List;
import java.util.ArrayList;

import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.ListItem;

public class ChooseContactActivity extends AbstractSearchableListItemActivity {

	private Set<Contact> selected;
	private Set<String> filterContacts;

	@Override
	public void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		filterContacts = new HashSet<>();
		String[] contacts = getIntent().getStringArrayExtra("filter_contacts");
		if (contacts != null) {
			Collections.addAll(filterContacts, contacts);
		}

		if (getIntent().getBooleanExtra("multiple", false)) {
			getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
			getListView().setMultiChoiceModeListener(new MultiChoiceModeListener() {

				@Override
				public  boolean onPrepareActionMode(ActionMode mode, Menu menu) {
					return false;
				}

				@Override
				public boolean onCreateActionMode(ActionMode mode, Menu menu) {
					final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
					imm.hideSoftInputFromWindow(getSearchEditText().getWindowToken(),
							InputMethodManager.HIDE_IMPLICIT_ONLY);
					MenuInflater inflater = getMenuInflater();
					inflater.inflate(R.menu.select_multiple, menu);
					selected = new HashSet<Contact>();
					return true;
				}

				@Override
				public void onDestroyActionMode(ActionMode mode) {
				}

				@Override
				public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
					switch(item.getItemId()) {
						case R.id.selection_submit:
							final Intent request = getIntent();
							final Intent data = new Intent();
							data.putExtra("conversation",
									request.getStringExtra("conversation"));
							String[] selection = getSelectedContactJids();
							data.putExtra("contacts", selection);
							data.putExtra("multiple", true);
							setResult(RESULT_OK, data);
							finish();
							return true;
					}
					return false;
				}

				@Override
				public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
					Contact item = (Contact) getListItems().get(position);
					if (checked) {
						selected.add(item);
					} else {
						selected.remove(item);
					}
					int numSelected = selected.size();
					MenuItem selectButton = mode.getMenu().findItem(R.id.selection_submit);
					String buttonText = getResources().getQuantityString(R.plurals.select_contact,
							numSelected, numSelected);
					selectButton.setTitle(buttonText);
				}
			});
		}

		getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {

			@Override
			public void onItemClick(final AdapterView<?> parent, final View view,
					final int position, final long id) {
				final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
				imm.hideSoftInputFromWindow(getSearchEditText().getWindowToken(),
						InputMethodManager.HIDE_IMPLICIT_ONLY);
				final Intent request = getIntent();
				final Intent data = new Intent();
				final ListItem mListItem = getListItems().get(position);
				data.putExtra("contact", mListItem.getJid().toString());
				String account = request.getStringExtra("account");
				if (account == null && mListItem instanceof Contact) {
					account = ((Contact) mListItem).getAccount().getJid().toBareJid().toString();
				}
				data.putExtra("account", account);
				data.putExtra("conversation",
						request.getStringExtra("conversation"));
				data.putExtra("multiple", false);
				setResult(RESULT_OK, data);
				finish();
			}
		});

	}

	protected void filterContacts(final String needle) {
		getListItems().clear();
		for (final Account account : xmppConnectionService.getAccounts()) {
			if (account.getStatus() != Account.State.DISABLED) {
				for (final Contact contact : account.getRoster().getContacts()) {
					if (contact.showInRoster() &&
							!filterContacts.contains(contact.getJid().toBareJid().toString())
							&& contact.match(needle)) {
						getListItems().add(contact);
					}
				}
			}
		}
		Collections.sort(getListItems());
		getListItemAdapter().notifyDataSetChanged();
	}

	private String[] getSelectedContactJids() {
		List<String> result = new ArrayList<>();
		for (Contact contact : selected) {
			result.add(contact.getJid().toString());
		}
		return result.toArray(new String[result.size()]);
	}

}