Java tutorial
/** * Copyright (C) 2014 Open 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.thoughtcrime.securesms; import android.app.Activity; import android.app.IntentService; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.content.LocalBroadcastManager; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.util.Pair; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.google.protobuf.ByteString; import com.soundcloud.android.crop.Crop; import org.thoughtcrime.securesms.components.PushRecipientsPanel; import org.thoughtcrime.securesms.contacts.ContactAccessor; import org.thoughtcrime.securesms.contacts.RecipientsEditor; import org.thoughtcrime.securesms.database.DatabaseFactory; import org.thoughtcrime.securesms.database.GroupDatabase; import org.thoughtcrime.securesms.database.ThreadDatabase; import org.thoughtcrime.securesms.mms.OutgoingGroupMediaMessage; import org.thoughtcrime.securesms.recipients.Recipient; import org.thoughtcrime.securesms.recipients.RecipientFactory; import org.thoughtcrime.securesms.recipients.Recipients; import org.thoughtcrime.securesms.sms.MessageSender; import org.thoughtcrime.securesms.util.BitmapDecodingException; import org.thoughtcrime.securesms.util.BitmapUtil; import org.thoughtcrime.securesms.util.DynamicLanguage; import org.thoughtcrime.securesms.util.DynamicTheme; import org.thoughtcrime.securesms.util.GroupUtil; import org.thoughtcrime.securesms.util.ProgressDialogAsyncTask; import org.thoughtcrime.securesms.util.SelectedRecipientsAdapter; import org.thoughtcrime.securesms.util.TextSecurePreferences; import org.thoughtcrime.securesms.util.Util; import org.thoughtcrime.securesms.crypto.MasterSecret; import org.thoughtcrime.securesms.database.TextSecureDirectory; import org.thoughtcrime.securesms.database.NotInDirectoryException; import org.whispersystems.textsecure.api.util.InvalidNumberException; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.LinkedList; import java.util.List; import java.util.Set; import ws.com.google.android.mms.MmsException; import static org.thoughtcrime.securesms.contacts.ContactAccessor.ContactData; import static org.whispersystems.textsecure.internal.push.PushMessageProtos.PushMessageContent.GroupContext; /** * Activity to create and update groups * * @author Jake McGinty */ public class GroupCreateActivity extends PassphraseRequiredActionBarActivity { private final static String TAG = GroupCreateActivity.class.getSimpleName(); private final static String DECODECROPANDSET_FILTER = "GroupCreateActivity_decodeCropAndSetReceiver"; public static final String GROUP_RECIPIENT_EXTRA = "group_recipient"; public static final String GROUP_THREAD_EXTRA = "group_thread"; private final DynamicTheme dynamicTheme = new DynamicTheme(); private final DynamicLanguage dynamicLanguage = new DynamicLanguage(); private static final int PICK_CONTACT = 1; private static final int PICK_AVATAR = 2; public static final int AVATAR_SIZE = 210; private EditText groupName; private ListView lv; private PushRecipientsPanel recipientsPanel; private ImageView avatar; private TextView creatingText; private Recipient groupRecipient = null; private long groupThread = -1; private byte[] groupId = null; private Set<Recipient> existingContacts = null; private String existingTitle = null; private Bitmap existingAvatarBmp = null; private MasterSecret masterSecret; private Bitmap avatarBmp; private Set<Recipient> selectedContacts; private DecodeCropAndSetReceiver decodeCropAndSetReceiver; @Override protected void onPreCreate() { dynamicTheme.onCreate(this); dynamicLanguage.onCreate(this); } @Override protected void onCreate(Bundle state, @NonNull MasterSecret masterSecret) { this.masterSecret = masterSecret; setContentView(R.layout.group_create_activity); getSupportActionBar().setDisplayHomeAsUpEnabled(true); selectedContacts = new HashSet<>(); initializeResources(); decodeCropAndSetReceiver = new DecodeCropAndSetReceiver(); LocalBroadcastManager.getInstance(this).registerReceiver(decodeCropAndSetReceiver, new IntentFilter(DECODECROPANDSET_FILTER)); } @Override public void onDestroy() { super.onDestroy(); if (decodeCropAndSetReceiver != null) LocalBroadcastManager.getInstance(this).unregisterReceiver(decodeCropAndSetReceiver); } @Override public void onResume() { super.onResume(); dynamicTheme.onResume(this); dynamicLanguage.onResume(this); getSupportActionBar().setTitle(R.string.GroupCreateActivity_actionbar_title); if (!TextSecurePreferences.isPushRegistered(this)) { disableWhisperGroupUi(R.string.GroupCreateActivity_you_dont_support_push); } } private boolean whisperGroupUiEnabled() { return groupName.isEnabled() && avatar.isEnabled(); } private void disableWhisperGroupUi(int reasonResId) { View pushDisabled = findViewById(R.id.push_disabled); pushDisabled.setVisibility(View.VISIBLE); ((TextView) findViewById(R.id.push_disabled_reason)).setText(reasonResId); avatar.setEnabled(false); groupName.setEnabled(false); } private void enableWhisperGroupUi() { findViewById(R.id.push_disabled).setVisibility(View.GONE); avatar.setEnabled(true); groupName.setEnabled(true); final CharSequence groupNameText = groupName.getText(); if (groupNameText != null && groupNameText.length() > 0) { getSupportActionBar().setTitle(groupNameText); } else { getSupportActionBar().setTitle(R.string.GroupCreateActivity_actionbar_title); } } private static boolean isActiveInDirectory(Context context, Recipient recipient) { try { if (!TextSecureDirectory.getInstance(context) .isActiveNumber(Util.canonicalizeNumber(context, recipient.getNumber()))) { return false; } } catch (NotInDirectoryException e) { return false; } catch (InvalidNumberException e) { return false; } return true; } private void addSelectedContact(Recipient contact) { final boolean isPushUser = isActiveInDirectory(this, contact); if (existingContacts != null && !isPushUser) { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_cannot_add_non_push_to_existing_group, Toast.LENGTH_LONG).show(); return; } if (!selectedContacts.contains(contact) && (existingContacts == null || !existingContacts.contains(contact))) selectedContacts.add(contact); if (!isPushUser) { disableWhisperGroupUi(R.string.GroupCreateActivity_contacts_dont_support_push); getSupportActionBar().setTitle(R.string.GroupCreateActivity_actionbar_mms_title); } } private void addAllSelectedContacts(Collection<Recipient> contacts) { for (Recipient contact : contacts) { addSelectedContact(contact); } } private void removeSelectedContact(Recipient contact) { selectedContacts.remove(contact); if (!isActiveInDirectory(this, contact)) { for (Recipient recipient : selectedContacts) { if (!isActiveInDirectory(this, recipient)) return; } enableWhisperGroupUi(); } } private void initializeResources() { groupRecipient = RecipientFactory.getRecipientForId(this, getIntent().getLongExtra(GROUP_RECIPIENT_EXTRA, -1), true); groupThread = getIntent().getLongExtra(GROUP_THREAD_EXTRA, -1); if (groupRecipient != null) { final String encodedGroupId = groupRecipient.getNumber(); if (encodedGroupId != null) { try { groupId = GroupUtil.getDecodedId(encodedGroupId); } catch (IOException ioe) { Log.w(TAG, "Couldn't decode the encoded groupId passed in via intent", ioe); groupId = null; } if (groupId != null) { new FillExistingGroupInfoAsyncTask().execute(); } } } lv = (ListView) findViewById(R.id.selected_contacts_list); avatar = (ImageView) findViewById(R.id.avatar); groupName = (EditText) findViewById(R.id.group_name); creatingText = (TextView) findViewById(R.id.creating_group_text); recipientsPanel = (PushRecipientsPanel) findViewById(R.id.recipients); groupName.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void afterTextChanged(Editable editable) { final int prefixResId = (groupId != null) ? R.string.GroupCreateActivity_actionbar_update_title : R.string.GroupCreateActivity_actionbar_title; if (editable.length() > 0) { getSupportActionBar().setTitle(getString(prefixResId) + ": " + editable.toString()); } else { getSupportActionBar().setTitle(prefixResId); } } }); SelectedRecipientsAdapter adapter = new SelectedRecipientsAdapter(this, android.R.id.text1, new ArrayList<SelectedRecipientsAdapter.RecipientWrapper>()); adapter.setOnRecipientDeletedListener(new SelectedRecipientsAdapter.OnRecipientDeletedListener() { @Override public void onRecipientDeleted(Recipient recipient) { removeSelectedContact(recipient); } }); lv.setAdapter(adapter); recipientsPanel.setPanelChangeListener(new PushRecipientsPanel.RecipientsPanelChangedListener() { @Override public void onRecipientsPanelUpdate(Recipients recipients) { Log.i(TAG, "onRecipientsPanelUpdate received."); if (recipients != null) { addAllSelectedContacts(recipients.getRecipientsList()); syncAdapterWithSelectedContacts(); } } }); (findViewById(R.id.contacts_button)).setOnClickListener(new AddRecipientButtonListener()); avatar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Crop.pickImage(GroupCreateActivity.this); } }); ((RecipientsEditor) findViewById(R.id.recipients_text)).setHint(R.string.recipients_panel__add_member); } @Override public boolean onPrepareOptionsMenu(Menu menu) { MenuInflater inflater = this.getMenuInflater(); menu.clear(); inflater.inflate(R.menu.group_create, menu); super.onPrepareOptionsMenu(menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch (item.getItemId()) { case android.R.id.home: finish(); return true; case R.id.menu_create_group: if (groupId == null) handleGroupCreate(); else handleGroupUpdate(); return true; } return false; } private void handleGroupCreate() { if (selectedContacts.size() < 1) { Log.i(TAG, getString(R.string.GroupCreateActivity_contacts_no_members)); Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_no_members, Toast.LENGTH_SHORT).show(); return; } if (whisperGroupUiEnabled()) { enableWhisperGroupProgressUi(false); new CreateWhisperGroupAsyncTask().execute(); } else { new CreateMmsGroupAsyncTask().execute(); } } private void handleGroupUpdate() { if (whisperGroupUiEnabled()) { enableWhisperGroupProgressUi(true); } new UpdateWhisperGroupAsyncTask().execute(); } private void enableWhisperGroupProgressUi(boolean isGroupUpdate) { findViewById(R.id.group_details_layout).setVisibility(View.GONE); findViewById(R.id.creating_group_layout).setVisibility(View.VISIBLE); findViewById(R.id.menu_create_group).setVisibility(View.GONE); if (groupName.getText() != null) { final int titleResId = isGroupUpdate ? R.string.GroupCreateActivity_updating_group : R.string.GroupCreateActivity_creating_group; creatingText.setText(getString(titleResId, groupName.getText().toString())); } } private void disableWhisperGroupProgressUi() { findViewById(R.id.group_details_layout).setVisibility(View.VISIBLE); findViewById(R.id.creating_group_layout).setVisibility(View.GONE); findViewById(R.id.menu_create_group).setVisibility(View.VISIBLE); } private void syncAdapterWithSelectedContacts() { SelectedRecipientsAdapter adapter = (SelectedRecipientsAdapter) lv.getAdapter(); adapter.clear(); for (Recipient contact : selectedContacts) { adapter.add(new SelectedRecipientsAdapter.RecipientWrapper(contact, true)); } if (existingContacts != null) { for (Recipient contact : existingContacts) { adapter.add(new SelectedRecipientsAdapter.RecipientWrapper(contact, false)); } } adapter.notifyDataSetChanged(); } @Override public void onActivityResult(int reqCode, int resultCode, Intent data) { super.onActivityResult(reqCode, resultCode, data); Uri outputFile = Uri.fromFile(new File(getCacheDir(), "cropped")); if (data == null || resultCode != Activity.RESULT_OK) return; switch (reqCode) { case PICK_CONTACT: List<String> selected = data.getStringArrayListExtra("contacts"); for (String contact : selected) { Recipient recipient = RecipientFactory.getRecipientsFromString(this, contact, false) .getPrimaryRecipient(); if (!selectedContacts.contains(recipient) && (existingContacts == null || !existingContacts.contains(recipient)) && recipient != null) { addSelectedContact(recipient); } } syncAdapterWithSelectedContacts(); break; case Crop.REQUEST_PICK: new Crop(data.getData()).output(outputFile).asSquare().start(this); break; case Crop.REQUEST_CROP: Intent decodeCropAndSet = new Intent(this, DecodeCropAndSetService.class); decodeCropAndSet.putExtra("masterSecret", masterSecret); decodeCropAndSet.putExtra("avatarUri", Crop.getOutput(data)); this.startService(decodeCropAndSet); } } private class AddRecipientButtonListener implements View.OnClickListener { @Override public void onClick(View v) { Intent intent = new Intent(GroupCreateActivity.this, PushContactSelectionActivity.class); if (existingContacts != null) intent.putExtra(PushContactSelectionActivity.PUSH_ONLY_EXTRA, true); startActivityForResult(intent, PICK_CONTACT); } } private Pair<Long, Recipients> handleCreatePushGroup(String groupName, byte[] avatar, Set<Recipient> members) throws InvalidNumberException, MmsException { GroupDatabase groupDatabase = DatabaseFactory.getGroupDatabase(this); byte[] groupId = groupDatabase.allocateGroupId(); Set<String> memberE164Numbers = getE164Numbers(members); memberE164Numbers.add(TextSecurePreferences.getLocalNumber(this)); groupDatabase.create(groupId, groupName, new LinkedList<String>(memberE164Numbers), null, null); groupDatabase.updateAvatar(groupId, avatar); return handlePushOperation(groupId, groupName, avatar, memberE164Numbers); } private Pair<Long, Recipients> handleUpdatePushGroup(byte[] groupId, String groupName, byte[] avatar, Set<Recipient> members) throws InvalidNumberException, MmsException { GroupDatabase groupDatabase = DatabaseFactory.getGroupDatabase(this); Set<String> memberE164Numbers = getE164Numbers(members); memberE164Numbers.add(TextSecurePreferences.getLocalNumber(this)); for (String number : memberE164Numbers) Log.w(TAG, "Updating: " + number); groupDatabase.updateMembers(groupId, new LinkedList<String>(memberE164Numbers)); groupDatabase.updateTitle(groupId, groupName); groupDatabase.updateAvatar(groupId, avatar); return handlePushOperation(groupId, groupName, avatar, memberE164Numbers); } private Pair<Long, Recipients> handlePushOperation(byte[] groupId, String groupName, byte[] avatar, Set<String> e164numbers) throws InvalidNumberException { String groupRecipientId = GroupUtil.getEncodedId(groupId); Recipients groupRecipient = RecipientFactory.getRecipientsFromString(this, groupRecipientId, false); GroupContext context = GroupContext.newBuilder().setId(ByteString.copyFrom(groupId)) .setType(GroupContext.Type.UPDATE).setName(groupName).addAllMembers(e164numbers).build(); OutgoingGroupMediaMessage outgoingMessage = new OutgoingGroupMediaMessage(this, groupRecipient, context, avatar); long threadId = MessageSender.send(this, masterSecret, outgoingMessage, -1, false); return new Pair<>(threadId, groupRecipient); } private long handleCreateMmsGroup(Set<Recipient> members) { Recipients recipients = new Recipients(new LinkedList<Recipient>(members)); return DatabaseFactory.getThreadDatabase(this).getThreadIdFor(recipients, ThreadDatabase.DistributionTypes.CONVERSATION); } private static <T> ArrayList<T> setToArrayList(Set<T> set) { ArrayList<T> arrayList = new ArrayList<T>(set.size()); for (T item : set) { arrayList.add(item); } return arrayList; } private Set<String> getE164Numbers(Set<Recipient> recipients) throws InvalidNumberException { Set<String> results = new HashSet<String>(); for (Recipient recipient : recipients) { results.add(Util.canonicalizeNumber(this, recipient.getNumber())); } return results; } private class DecodeCropAndSetReceiver extends BroadcastReceiver { @Override public void onReceive(Context receiverContext, Intent receiverIntent) { avatarBmp = (Bitmap) receiverIntent.getParcelableExtra("avatarBmp"); if (avatarBmp != null) avatar.setImageBitmap(avatarBmp); } } public static class DecodeCropAndSetService extends IntentService { private Bitmap avatarBmp; public DecodeCropAndSetService() { super("DecodeCropAndSetService"); } public void onHandleIntent(Intent intent) { MasterSecret masterSecret = (MasterSecret) intent.getParcelableExtra("masterSecret"); Uri avatarUri = (Uri) intent.getParcelableExtra("avatarUri"); Intent resultIntent = new Intent(DECODECROPANDSET_FILTER); if (avatarUri != null) { try { avatarBmp = BitmapUtil.createScaledBitmap(this, masterSecret, avatarUri, AVATAR_SIZE, AVATAR_SIZE); } catch (IOException | BitmapDecodingException e) { Log.w(TAG, e); LocalBroadcastManager.getInstance(this).sendBroadcast(resultIntent); return; } } resultIntent.putExtra("avatarBmp", avatarBmp); LocalBroadcastManager.getInstance(this).sendBroadcast(resultIntent); } } private class CreateMmsGroupAsyncTask extends AsyncTask<Void, Void, Long> { @Override protected Long doInBackground(Void... voids) { return handleCreateMmsGroup(selectedContacts); } @Override protected void onPostExecute(Long resultThread) { if (resultThread > -1) { Intent intent = new Intent(GroupCreateActivity.this, ConversationActivity.class); intent.putExtra(ConversationActivity.THREAD_ID_EXTRA, resultThread.longValue()); intent.putExtra(ConversationActivity.DISTRIBUTION_TYPE_EXTRA, ThreadDatabase.DistributionTypes.DEFAULT); ArrayList<Recipient> selectedContactsList = setToArrayList(selectedContacts); intent.putExtra(ConversationActivity.RECIPIENTS_EXTRA, new Recipients(selectedContactsList).getIds()); startActivity(intent); finish(); } else { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_mms_exception, Toast.LENGTH_LONG).show(); finish(); } } @Override protected void onProgressUpdate(Void... values) { super.onProgressUpdate(values); } } private class UpdateWhisperGroupAsyncTask extends AsyncTask<Void, Void, Pair<Long, Recipients>> { private long RES_BAD_NUMBER = -2; private long RES_MMS_EXCEPTION = -3; @Override protected Pair<Long, Recipients> doInBackground(Void... params) { byte[] avatarBytes = null; final Bitmap bitmap; if (avatarBmp == null) bitmap = existingAvatarBmp; else bitmap = avatarBmp; if (bitmap != null) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); avatarBytes = stream.toByteArray(); } final String name = (groupName.getText() != null) ? groupName.getText().toString() : null; try { Set<Recipient> unionContacts = new HashSet<Recipient>(selectedContacts); unionContacts.addAll(existingContacts); return handleUpdatePushGroup(groupId, name, avatarBytes, unionContacts); } catch (MmsException e) { Log.w(TAG, e); return new Pair<Long, Recipients>(RES_MMS_EXCEPTION, null); } catch (InvalidNumberException e) { Log.w(TAG, e); return new Pair<Long, Recipients>(RES_BAD_NUMBER, null); } } @Override protected void onPostExecute(Pair<Long, Recipients> groupInfo) { final long threadId = groupInfo.first; final Recipients recipients = groupInfo.second; if (threadId > -1) { Intent intent = getIntent(); intent.putExtra(GROUP_THREAD_EXTRA, threadId); intent.putExtra(GROUP_RECIPIENT_EXTRA, recipients.getIds()); setResult(RESULT_OK, intent); finish(); } else if (threadId == RES_BAD_NUMBER) { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_invalid_number, Toast.LENGTH_LONG).show(); disableWhisperGroupProgressUi(); } else if (threadId == RES_MMS_EXCEPTION) { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_mms_exception, Toast.LENGTH_LONG).show(); setResult(RESULT_CANCELED); finish(); } } } private class CreateWhisperGroupAsyncTask extends AsyncTask<Void, Void, Pair<Long, Recipients>> { private long RES_BAD_NUMBER = -2; private long RES_MMS_EXCEPTION = -3; @Override protected Pair<Long, Recipients> doInBackground(Void... voids) { byte[] avatarBytes = null; if (avatarBmp != null) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); avatarBmp.compress(Bitmap.CompressFormat.PNG, 100, stream); avatarBytes = stream.toByteArray(); } final String name = (groupName.getText() != null) ? groupName.getText().toString() : null; try { return handleCreatePushGroup(name, avatarBytes, selectedContacts); } catch (MmsException e) { Log.w(TAG, e); return new Pair<Long, Recipients>(RES_MMS_EXCEPTION, null); } catch (InvalidNumberException e) { Log.w(TAG, e); return new Pair<Long, Recipients>(RES_BAD_NUMBER, null); } } @Override protected void onPostExecute(Pair<Long, Recipients> groupInfo) { super.onPostExecute(groupInfo); final long threadId = groupInfo.first; final Recipients recipients = groupInfo.second; if (threadId > -1) { Intent intent = new Intent(GroupCreateActivity.this, ConversationActivity.class); intent.putExtra(ConversationActivity.THREAD_ID_EXTRA, threadId); intent.putExtra(ConversationActivity.DISTRIBUTION_TYPE_EXTRA, ThreadDatabase.DistributionTypes.DEFAULT); intent.putExtra(ConversationActivity.RECIPIENTS_EXTRA, recipients.getIds()); startActivity(intent); finish(); } else if (threadId == RES_BAD_NUMBER) { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_invalid_number, Toast.LENGTH_LONG).show(); disableWhisperGroupProgressUi(); } else if (threadId == RES_MMS_EXCEPTION) { Toast.makeText(getApplicationContext(), R.string.GroupCreateActivity_contacts_mms_exception, Toast.LENGTH_LONG).show(); finish(); } } @Override protected void onProgressUpdate(Void... values) { super.onProgressUpdate(values); } } private class FillExistingGroupInfoAsyncTask extends ProgressDialogAsyncTask<Void, Void, Void> { public FillExistingGroupInfoAsyncTask() { super(GroupCreateActivity.this, R.string.GroupCreateActivity_loading_group_details, R.string.please_wait); } @Override protected Void doInBackground(Void... voids) { final GroupDatabase db = DatabaseFactory.getGroupDatabase(GroupCreateActivity.this); final Recipients recipients = db.getGroupMembers(groupId, false); if (recipients != null) { final List<Recipient> recipientList = recipients.getRecipientsList(); if (recipientList != null) { if (existingContacts == null) existingContacts = new HashSet<>(recipientList.size()); existingContacts.addAll(recipientList); } } GroupDatabase.GroupRecord group = db.getGroup(groupId); if (group != null) { existingTitle = group.getTitle(); final byte[] existingAvatar = group.getAvatar(); if (existingAvatar != null) { existingAvatarBmp = BitmapFactory.decodeByteArray(existingAvatar, 0, existingAvatar.length); } } return null; } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); if (existingTitle != null) groupName.setText(existingTitle); if (existingAvatarBmp != null) avatar.setImageBitmap(existingAvatarBmp); if (existingContacts != null) syncAdapterWithSelectedContacts(); } } }