Java tutorial
/** * Copyright (C) 2015 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.smssecure.smssecure; import android.app.Activity; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.support.v7.app.AppCompatActivity; import android.support.v7.app.AlertDialog; import android.support.v7.view.ActionMode; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.ItemAnimator.ItemAnimatorFinishedListener; import android.support.v7.widget.RecyclerView.OnScrollListener; import android.text.ClipboardManager; import android.text.TextUtils; 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.View.OnClickListener; import android.view.ViewGroup; import android.view.Window; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.TextView; import android.widget.Toast; import org.smssecure.smssecure.ConversationAdapter.HeaderViewHolder; import org.smssecure.smssecure.ConversationAdapter.ItemClickListener; import org.smssecure.smssecure.crypto.MasterSecret; import org.smssecure.smssecure.database.DatabaseFactory; import org.smssecure.smssecure.database.MmsSmsDatabase; import org.smssecure.smssecure.database.loaders.ConversationLoader; import org.smssecure.smssecure.database.model.MediaMmsMessageRecord; import org.smssecure.smssecure.database.model.MessageRecord; import org.smssecure.smssecure.mms.Slide; import org.smssecure.smssecure.recipients.RecipientFactory; import org.smssecure.smssecure.recipients.Recipients; import org.smssecure.smssecure.sms.MessageSender; import org.smssecure.smssecure.util.SilencePreferences; import org.smssecure.smssecure.util.task.ProgressDialogAsyncTask; import org.smssecure.smssecure.util.SaveAttachmentTask; import org.smssecure.smssecure.util.SaveAttachmentTask.Attachment; import org.smssecure.smssecure.util.StickyHeaderDecoration; import org.smssecure.smssecure.util.ViewUtil; import org.smssecure.smssecure.util.SilencePreferences; import java.util.Collections; import java.util.Comparator; import java.util.LinkedList; import java.util.List; import java.util.Locale; import java.util.Set; public class ConversationFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = ConversationFragment.class.getSimpleName(); private static final long PARTIAL_CONVERSATION_LIMIT = 500L; private final ActionModeCallback actionModeCallback = new ActionModeCallback(); private final ItemClickListener selectionClickListener = new ConversationFragmentItemClickListener(); private ConversationFragmentListener listener; private MasterSecret masterSecret; private Recipients recipients; private long threadId; private long lastSeen; private boolean firstLoad; private ActionMode actionMode; private Locale locale; private RecyclerView list; private RecyclerView.ItemDecoration lastSeenDecoration; private View loadMoreView; private View composeDivider; private View scrollToBottomButton; private TextView scrollDateHeader; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); this.masterSecret = getArguments().getParcelable("master_secret"); this.locale = (Locale) getArguments().getSerializable(PassphraseRequiredActionBarActivity.LOCALE_EXTRA); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) { final View view = inflater.inflate(R.layout.conversation_fragment, container, false); list = ViewUtil.findById(view, android.R.id.list); composeDivider = ViewUtil.findById(view, R.id.compose_divider); scrollToBottomButton = ViewUtil.findById(view, R.id.scroll_to_bottom_button); scrollDateHeader = ViewUtil.findById(view, R.id.scroll_date_header); scrollToBottomButton.setOnClickListener(new OnClickListener() { @Override public void onClick(final View view) { scrollToBottom(); } }); final LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, true); list.setHasFixedSize(false); list.setLayoutManager(layoutManager); loadMoreView = inflater.inflate(R.layout.load_more_header, container, false); loadMoreView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Bundle args = new Bundle(); args.putLong("limit", 0); getLoaderManager().restartLoader(0, args, ConversationFragment.this); } }); return view; } @Override public void onActivityCreated(Bundle bundle) { super.onActivityCreated(bundle); initializeResources(); initializeListAdapter(); } @Override public void onAttach(Activity activity) { super.onAttach(activity); this.listener = (ConversationFragmentListener) activity; } @Override public void onResume() { super.onResume(); if (list.getAdapter() != null) { list.getAdapter().notifyDataSetChanged(); } } public void onNewIntent() { if (actionMode != null) { actionMode.finish(); } initializeResources(); initializeListAdapter(); if (threadId == -1) { getLoaderManager().restartLoader(0, Bundle.EMPTY, this); } } public void reloadList() { getLoaderManager().restartLoader(0, Bundle.EMPTY, this); } private void initializeResources() { this.recipients = RecipientFactory.getRecipientsForIds(getActivity(), getActivity().getIntent().getLongArrayExtra("recipients"), true); this.threadId = this.getActivity().getIntent().getLongExtra("thread_id", -1); this.lastSeen = this.getActivity().getIntent().getLongExtra(ConversationActivity.LAST_SEEN_EXTRA, -1); this.firstLoad = true; OnScrollListener scrollListener = new ConversationScrollListener(getActivity()); list.addOnScrollListener(scrollListener); } private void initializeListAdapter() { if (this.recipients != null && this.threadId != -1) { ConversationAdapter adapter = new ConversationAdapter(getActivity(), masterSecret, locale, selectionClickListener, null, this.recipients); list.setAdapter(adapter); list.addItemDecoration(new StickyHeaderDecoration(adapter, false, false)); setLastSeen(lastSeen); getLoaderManager().restartLoader(0, Bundle.EMPTY, this); list.getItemAnimator().setMoveDuration(120); } } private void setCorrectMenuVisibility(Menu menu) { Set<MessageRecord> messageRecords = getListAdapter().getSelectedItems(); if (actionMode != null && messageRecords.size() == 0) { actionMode.finish(); return; } if (messageRecords.size() > 1) { menu.findItem(R.id.menu_context_forward).setVisible(false); menu.findItem(R.id.menu_context_details).setVisible(false); menu.findItem(R.id.menu_context_save_attachment).setVisible(false); menu.findItem(R.id.menu_context_resend).setVisible(false); } else { MessageRecord messageRecord = messageRecords.iterator().next(); menu.findItem(R.id.menu_context_resend).setVisible(messageRecord.isFailed()); menu.findItem(R.id.menu_context_save_attachment) .setVisible(messageRecord.isMms() && !messageRecord.isMmsNotification() && ((MediaMmsMessageRecord) messageRecord).containsMediaSlide()); menu.findItem(R.id.menu_context_forward).setVisible(true); menu.findItem(R.id.menu_context_details).setVisible(true); menu.findItem(R.id.menu_context_copy).setVisible(true); } } private ConversationAdapter getListAdapter() { return (ConversationAdapter) list.getAdapter(); } private MessageRecord getSelectedMessageRecord() { Set<MessageRecord> messageRecords = getListAdapter().getSelectedItems(); if (messageRecords.size() == 1) return messageRecords.iterator().next(); else throw new AssertionError(); } public void reload(Recipients recipients, long threadId) { this.recipients = recipients; if (this.threadId != threadId) { this.threadId = threadId; initializeListAdapter(); } } public void scrollToBottom() { list.scrollToPosition(0); } public void setLastSeen(long lastSeen) { this.lastSeen = lastSeen; if (lastSeenDecoration != null) { list.removeItemDecoration(lastSeenDecoration); } final Context context = getActivity().getApplicationContext(); if (!SilencePreferences.hideUnreadMessageDivider(context)) { lastSeenDecoration = new ConversationAdapter.LastSeenHeader(getListAdapter(), lastSeen); list.addItemDecoration(lastSeenDecoration); } } private void handleCopyMessage(final Set<MessageRecord> messageRecords) { List<MessageRecord> messageList = new LinkedList<>(messageRecords); Collections.sort(messageList, new Comparator<MessageRecord>() { @Override public int compare(MessageRecord lhs, MessageRecord rhs) { if (lhs.getDateReceived() < rhs.getDateReceived()) return -1; else if (lhs.getDateReceived() == rhs.getDateReceived()) return 0; else return 1; } }); StringBuilder bodyBuilder = new StringBuilder(); ClipboardManager clipboard = (ClipboardManager) getActivity().getSystemService(Context.CLIPBOARD_SERVICE); boolean first = true; for (MessageRecord messageRecord : messageList) { String body = messageRecord.getDisplayBody().toString(); if (body != null) { if (!first) bodyBuilder.append('\n'); bodyBuilder.append(body); first = false; } } String result = bodyBuilder.toString(); if (!TextUtils.isEmpty(result)) clipboard.setText(result); } private void handleDeleteMessages(final Set<MessageRecord> messageRecords) { int messagesCount = messageRecords.size(); AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setIconAttribute(R.attr.dialog_alert_icon); builder.setTitle(getActivity().getResources().getQuantityString( R.plurals.ConversationFragment_delete_selected_messages, messagesCount, messagesCount)); builder.setMessage(getActivity().getResources().getQuantityString( R.plurals.ConversationFragment_this_will_permanently_delete_all_n_selected_messages, messagesCount, messagesCount)); builder.setCancelable(true); builder.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { new ProgressDialogAsyncTask<MessageRecord, Void, Void>(getActivity(), R.string.ConversationFragment_deleting, R.string.ConversationFragment_deleting_messages) { @Override protected Void doInBackground(MessageRecord... messageRecords) { for (MessageRecord messageRecord : messageRecords) { boolean threadDeleted; if (messageRecord.isMms()) { threadDeleted = DatabaseFactory.getMmsDatabase(getActivity()) .delete(messageRecord.getId()); } else { threadDeleted = DatabaseFactory.getSmsDatabase(getActivity()) .deleteMessage(messageRecord.getId()); } if (threadDeleted) { threadId = -1; listener.setThreadId(threadId); } } return null; } }.execute(messageRecords.toArray(new MessageRecord[messageRecords.size()])); } }); builder.setNegativeButton(R.string.no, null); builder.show(); } private void handleDisplayDetails(MessageRecord message) { Intent intent = new Intent(getActivity(), MessageDetailsActivity.class); intent.putExtra(MessageDetailsActivity.MASTER_SECRET_EXTRA, masterSecret); intent.putExtra(MessageDetailsActivity.MESSAGE_ID_EXTRA, message.getId()); intent.putExtra(MessageDetailsActivity.THREAD_ID_EXTRA, threadId); intent.putExtra(MessageDetailsActivity.TYPE_EXTRA, message.isMms() ? MmsSmsDatabase.MMS_TRANSPORT : MmsSmsDatabase.SMS_TRANSPORT); intent.putExtra(MessageDetailsActivity.RECIPIENTS_IDS_EXTRA, recipients.getIds()); startActivity(intent); } private void handleForwardMessage(MessageRecord message) { Intent composeIntent = new Intent(getActivity(), ShareActivity.class); composeIntent.putExtra(Intent.EXTRA_TEXT, message.getDisplayBody().toString()); if (message.isMms()) { MediaMmsMessageRecord mediaMessage = (MediaMmsMessageRecord) message; if (mediaMessage.containsMediaSlide()) { Slide slide = mediaMessage.getSlideDeck().getSlides().get(0); composeIntent.putExtra(Intent.EXTRA_STREAM, slide.getUri()); composeIntent.setType(slide.getContentType()); } } startActivity(composeIntent); } private void handleResendMessage(final MessageRecord message) { final Context context = getActivity().getApplicationContext(); new AsyncTask<MessageRecord, Void, Void>() { @Override protected Void doInBackground(MessageRecord... messageRecords) { MessageSender.resend(context, masterSecret, messageRecords[0]); return null; } }.execute(message); } private void handleSaveAttachment(final MediaMmsMessageRecord message) { SaveAttachmentTask.showWarningDialog(getActivity(), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { for (Slide slide : message.getSlideDeck().getSlides()) { if (slide.hasImage() || slide.hasVideo() || slide.hasAudio()) { SaveAttachmentTask saveTask = new SaveAttachmentTask(getActivity(), masterSecret); saveTask.execute( new Attachment(slide.getUri(), slide.getContentType(), message.getDateReceived())); return; } } Log.w(TAG, "No slide with attachable media found, failing nicely."); Toast.makeText(getActivity(), getResources().getQuantityString( R.plurals.ConversationFragment_error_while_saving_attachments_to_sd_card, 1), Toast.LENGTH_LONG).show(); } }); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { return new ConversationLoader(getActivity(), threadId, args.getLong("limit", PARTIAL_CONVERSATION_LIMIT), lastSeen); } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { Log.w(TAG, "onLoadFinished"); ConversationLoader loader = (ConversationLoader) cursorLoader; if (list.getAdapter() != null) { if (cursor.getCount() >= PARTIAL_CONVERSATION_LIMIT && loader.hasLimit()) { getListAdapter().setFooterView(loadMoreView); } else { getListAdapter().setFooterView(null); } if (lastSeen == -1) { setLastSeen(loader.getLastSeen()); } getListAdapter().changeCursor(cursor); int lastSeenPosition = getListAdapter().findLastSeenPosition(lastSeen); if (firstLoad) { scrollToLastSeenPosition(lastSeenPosition); firstLoad = false; } if (lastSeenPosition <= 0) { setLastSeen(0); } } } @Override public void onLoaderReset(Loader<Cursor> arg0) { if (list.getAdapter() != null) { getListAdapter().changeCursor(null); } } private void scrollToLastSeenPosition(final int lastSeenPosition) { if (lastSeenPosition > 0) { list.post(new Runnable() { @Override public void run() { ((LinearLayoutManager) list.getLayoutManager()).scrollToPositionWithOffset(lastSeenPosition, list.getHeight()); } }); } } public interface ConversationFragmentListener { void setThreadId(long threadId); } private class ConversationScrollListener extends OnScrollListener { private final Animation scrollButtonInAnimation; private final Animation scrollButtonOutAnimation; private final ConversationDateHeader conversationDateHeader; private boolean wasAtBottom = true; private boolean wasAtZoomScrollHeight = false; private long lastPositionId = -1; ConversationScrollListener(@NonNull Context context) { this.scrollButtonInAnimation = AnimationUtils.loadAnimation(context, R.anim.fade_scale_in); this.scrollButtonOutAnimation = AnimationUtils.loadAnimation(context, R.anim.fade_scale_out); this.conversationDateHeader = new ConversationDateHeader(context, scrollDateHeader); this.scrollButtonInAnimation.setDuration(100); this.scrollButtonOutAnimation.setDuration(50); } @Override public void onScrolled(final RecyclerView rv, final int dx, final int dy) { boolean currentlyAtBottom = isAtBottom(); boolean currentlyAtZoomScrollHeight = isAtZoomScrollHeight(); int positionId = getHeaderPositionId(); if (currentlyAtBottom && !wasAtBottom) { ViewUtil.fadeOut(composeDivider, 50, View.INVISIBLE); ViewUtil.animateOut(scrollToBottomButton, scrollButtonOutAnimation, View.INVISIBLE); } else if (!currentlyAtBottom && wasAtBottom) { ViewUtil.fadeIn(composeDivider, 500); } if (currentlyAtZoomScrollHeight && !wasAtZoomScrollHeight) { ViewUtil.animateIn(scrollToBottomButton, scrollButtonInAnimation); } if (positionId != lastPositionId) { bindScrollHeader(conversationDateHeader, positionId); } wasAtBottom = currentlyAtBottom; wasAtZoomScrollHeight = currentlyAtZoomScrollHeight; lastPositionId = positionId; } @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { if (newState == RecyclerView.SCROLL_STATE_DRAGGING) { conversationDateHeader.show(); } else if (newState == RecyclerView.SCROLL_STATE_IDLE) { conversationDateHeader.hide(); } } private boolean isAtBottom() { if (list.getChildCount() == 0) return true; View bottomView = list.getChildAt(0); int firstVisibleItem = ((LinearLayoutManager) list.getLayoutManager()).findFirstVisibleItemPosition(); boolean isAtBottom = (firstVisibleItem == 0); return isAtBottom && bottomView.getBottom() <= list.getHeight(); } private boolean isAtZoomScrollHeight() { return ((LinearLayoutManager) list.getLayoutManager()).findFirstCompletelyVisibleItemPosition() > 4; } private int getHeaderPositionId() { return ((LinearLayoutManager) list.getLayoutManager()).findLastVisibleItemPosition(); } private void bindScrollHeader(HeaderViewHolder headerViewHolder, int positionId) { if (((ConversationAdapter) list.getAdapter()).getHeaderId(positionId) != -1) { ((ConversationAdapter) list.getAdapter()).onBindHeaderViewHolder(headerViewHolder, positionId); } } } private class ConversationFragmentItemClickListener implements ItemClickListener { @Override public void onItemClick(ConversationItem item) { if (actionMode != null) { MessageRecord messageRecord = item.getMessageRecord(); ((ConversationAdapter) list.getAdapter()).toggleSelection(messageRecord); list.getAdapter().notifyDataSetChanged(); setCorrectMenuVisibility(actionMode.getMenu()); } } @Override public void onItemLongClick(ConversationItem item) { if (actionMode == null) { ((ConversationAdapter) list.getAdapter()).toggleSelection(item.getMessageRecord()); list.getAdapter().notifyDataSetChanged(); actionMode = ((AppCompatActivity) getActivity()).startSupportActionMode(actionModeCallback); } } } private class ActionModeCallback implements ActionMode.Callback { private int statusBarColor; @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.conversation_context, menu); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Window window = getActivity().getWindow(); statusBarColor = window.getStatusBarColor(); window.setStatusBarColor(getResources().getColor(R.color.action_mode_status_bar)); window.setNavigationBarColor(getResources().getColor(android.R.color.black)); } setCorrectMenuVisibility(menu); return true; } @Override public boolean onPrepareActionMode(ActionMode actionMode, Menu menu) { return false; } @Override public void onDestroyActionMode(ActionMode mode) { ((ConversationAdapter) list.getAdapter()).clearSelection(); list.getAdapter().notifyDataSetChanged(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Window window = getActivity().getWindow(); window.setStatusBarColor(statusBarColor); window.setNavigationBarColor(getResources().getColor(android.R.color.black)); } actionMode = null; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { switch (item.getItemId()) { case R.id.menu_context_copy: handleCopyMessage(getListAdapter().getSelectedItems()); actionMode.finish(); return true; case R.id.menu_context_delete_message: handleDeleteMessages(getListAdapter().getSelectedItems()); actionMode.finish(); return true; case R.id.menu_context_details: handleDisplayDetails(getSelectedMessageRecord()); actionMode.finish(); return true; case R.id.menu_context_forward: handleForwardMessage(getSelectedMessageRecord()); actionMode.finish(); return true; case R.id.menu_context_resend: handleResendMessage(getSelectedMessageRecord()); actionMode.finish(); return true; case R.id.menu_context_save_attachment: handleSaveAttachment((MediaMmsMessageRecord) getSelectedMessageRecord()); actionMode.finish(); return true; } return false; } } private static class ConversationDateHeader extends HeaderViewHolder { private final Animation animateIn; private final Animation animateOut; private boolean pendingHide = false; private ConversationDateHeader(Context context, TextView textView) { super(textView); this.animateIn = AnimationUtils.loadAnimation(context, R.anim.slide_from_top); this.animateOut = AnimationUtils.loadAnimation(context, R.anim.slide_to_top); this.animateIn.setDuration(100); this.animateOut.setDuration(100); } public void show() { if (pendingHide) { pendingHide = false; } else { ViewUtil.animateIn(textView, animateIn); } } public void hide() { pendingHide = true; textView.postDelayed(new Runnable() { @Override public void run() { if (pendingHide) { pendingHide = false; ViewUtil.animateOut(textView, animateOut, View.GONE); } } }, 400); } } }