Java tutorial
/* * Copyright (c) 2014 Jakob Wenzel, Ramon Wirsch. * * This file is part of RallyeSoft. * * RallyeSoft 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. * * RallyeSoft 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 RallyeSoft. If not, see <http://www.gnu.org/licenses/>. */ package de.stadtrallye.rallyesoft.fragments; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.text.Editable; 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.widget.AbsListView; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.EditText; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.Toast; import com.nostra13.universalimageloader.core.ImageLoader; import de.rallye.model.structures.PostChat; import de.stadtrallye.rallyesoft.PictureGalleryActivity; import de.stadtrallye.rallyesoft.R; import de.stadtrallye.rallyesoft.common.Std; import de.stadtrallye.rallyesoft.model.Server; import de.stadtrallye.rallyesoft.model.chat.ChatEntry; import de.stadtrallye.rallyesoft.model.chat.IChatroom; import de.stadtrallye.rallyesoft.model.pictures.IPictureManager; import de.stadtrallye.rallyesoft.model.pictures.PictureManager; import de.stadtrallye.rallyesoft.storage.Storage; import de.stadtrallye.rallyesoft.threading.Threading; import de.stadtrallye.rallyesoft.uimodel.ChatCursorAdapter; import de.stadtrallye.rallyesoft.uimodel.IPictureHandler; import de.stadtrallye.rallyesoft.uimodel.IProgressUI; import static de.stadtrallye.rallyesoft.uimodel.TabManager.getTabManager; /** * One Chatroom, with input methods * @author Ramon * */ public class ChatroomFragment extends Fragment implements IChatroom.IChatroomListener, OnClickListener, OnItemClickListener, AbsListView.OnScrollListener { private static final String THIS = ChatroomFragment.class.getSimpleName(); private static final boolean DEBUG = false; private int roomID; private int[] lastPos = null; //[0] = line, [1] = px private IChatroom chatroom; private IProgressUI ui; // access to IndeterminateProgress in ActionBar private ListView list; //List of ChatEntries private ChatCursorAdapter chatAdapter; //Adapter for List private ImageButton send; private EditText text; private ProgressBar loading; private ImageView chosen_picture; private IPictureHandler pictureHandler; private PictureManager pictureManager; /** * retain savedInstanceState for when creating the list (ScrollState) */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Bundle args = getArguments(); if (args != null) roomID = args.getInt(Std.CHATROOM, -1); if (savedInstanceState != null) lastPos = savedInstanceState.getIntArray(Std.LAST_POS); else lastPos = new int[2]; setHasOptionsMenu(true); chatroom = Server.getCurrentServer().acquireChatManager(this).findChatroom(roomID); pictureManager = Storage.getPictureManager(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { MenuItem refreshMenuItem = menu.add(Menu.NONE, R.id.refresh_menu, 30, R.string.refresh); refreshMenuItem.setIcon(R.drawable.ic_refresh_light); refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); MenuItem pictureMenuItem = menu.add(Menu.NONE, R.id.picture_menu, 10, R.string.take_picture); pictureMenuItem.setIcon(R.drawable.ic_camera_light); pictureMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); } @Override public void onPrepareOptionsMenu(Menu menu) { boolean drawerOpen = getTabManager(getActivity()).isMenuOpen(); menu.findItem(R.id.refresh_menu).setVisible(!drawerOpen); menu.findItem(R.id.picture_menu).setVisible(!drawerOpen); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.refresh_menu: chatroom.update(); return true; case R.id.picture_menu: //Open a chooser containing all apps that can pick a jpeg and the camera Intent intent = pictureManager.startPictureTakeOrSelect( PictureManager.getSourceHint(PictureManager.SOURCE_CHAT, chatroom.getName())); startActivityForResult(intent, PictureManager.REQUEST_CODE); return true; default: return false; } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.chat_list, container, false); list = (ListView) v.findViewById(R.id.chat_list); send = (ImageButton) v.findViewById(R.id.button_send); text = (EditText) v.findViewById(R.id.edit_new_message); loading = (ProgressBar) v.findViewById(R.id.loading); chosen_picture = (ImageView) v.findViewById(R.id.picture_chosen); send.setOnClickListener(this); list.setOnItemClickListener(this); list.setOnScrollListener(this); chosen_picture.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pictureHandler.discardPicture(); loadImagePreview(); } }); return v; } private void loadChats() { if (chatroom == null) { throw new IllegalArgumentException(THIS + " could not find the Model of Chatroom " + roomID); } chatAdapter = new ChatCursorAdapter(getActivity(), Server.getCurrentServer().getPictureResolver(), chatroom); list.setAdapter(chatAdapter); list.setOnScrollListener(this);//TODO: use chatroom.getLastReadId() (wrap cursorAdapter add extra line) loadImagePreview(); chatroom.addListener(this); chatAdapter.changeCursor(chatroom.getChatCursor()); restoreLastReadId(chatroom.getLastReadId()); } private void loadImagePreview() { IPictureManager.IPicture pic = pictureHandler.getPicture(); if (pic != null/* && pic.getSource() == chatroom.getID()*/) {//TODO: use IPicture.UploadState chosen_picture.setVisibility(View.VISIBLE); ImageLoader.getInstance().displayImage(pic.getUri(), chosen_picture); } else { chosen_picture.setVisibility(View.GONE); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); try { ui = (IProgressUI) getActivity(); pictureHandler = (IPictureHandler) getActivity(); loadChats(); } catch (ClassCastException e) { Log.i(THIS, "Activity must implement IProgressUI and IPictureHandler"); throw e; } } /** * if we are logged in show progress and start asynchronous chat refresh */ @Override public void onStart() { super.onStart(); loadImagePreview(); } @Override public void onStop() { super.onStop(); // saveScrollState(); chatroom.removeListener(this); } /** * save into lastPos[]: 0: nr, 1: pixel */ private void saveScrollState() { if (lastPos == null) lastPos = new int[2]; lastPos[0] = list.getFirstVisiblePosition(); if (lastPos[0] == 0) { lastPos[1] = 0; } else { View v = list.getChildAt(0); lastPos[1] = v.getTop(); } } private void restoreLastReadId(int chatId) { list.setSelectionFromTop(chatAdapter.findPos(chatId), 0); } private void restoreScrollState() { if (lastPos != null) { list.setSelectionFromTop(lastPos[0], lastPos[1]); if (DEBUG) Log.v(THIS, "ScrollState restored: " + lastPos[0]); } else list.setSelection(list.getCount() - 1); } @Override public void onChatsChanged() { chatAdapter.changeCursor(chatroom.getChatCursor()); } @Override public void onStateChanged(IChatroom.ChatroomState newStatus) { switch (newStatus) { case Refreshing: ui.activateProgressAnimation(); break; case Ready: ui.deactivateProgressAnimation(); send.setEnabled(true); break; } } @Override public void onPostStateChange(PostChat post, IChatroom.PostState state, ChatEntry chat) { switch (state) { case Success: text.getText().clear(); loading.setVisibility(View.GONE); chatAdapter.changeCursor(chatroom.getChatCursor()); chosen_picture.setVisibility(View.GONE); pictureHandler.discardPicture(); break; case Failure: loading.setVisibility(View.GONE); Toast.makeText(getActivity(), getString(R.string.chat_post_failure), Toast.LENGTH_SHORT).show(); chosen_picture.setVisibility(View.GONE); break; case Uploading: loading.setVisibility(View.VISIBLE); break; } } @Override public void onClick(View v) { Editable msg = text.getText(); IPictureManager.IPicture pic = pictureHandler.getPicture(); if (pic != null || msg.length() > 0) { chatroom.postChat(msg.toString(), pic); pictureHandler.discardPicture();//TODO wait for postState result... } } // @Override // public void onActivityResult(int requestCode, int resultCode, Intent data) { // Log.i(THIS, "Received onActivityResult callback in Fragment!!"); // pictureManager.onActivityResult(requestCode, resultCode, data);//TODO android cannot find this fragment since it is not registered under its former id (yet / if any) |if it works remember picture // } @Override public void onItemClick(AdapterView<?> parent, View view, int pos, long id) { String picHash = chatAdapter.getPictureHash(pos); if (picHash == null) return; Intent intent = new Intent(getActivity(), PictureGalleryActivity.class); intent.putExtra(Std.PICTURE_GALLERY, chatroom.getPictureGallery(picHash)); // intent.putExtra(Std.CHATROOM, chatroom.getID()); // intent.putExtra(Std.IMAGE, picID); startActivity(intent); } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if (scrollState == SCROLL_STATE_IDLE) { int lastPos = view.getLastVisiblePosition(); chatroom.setLastReadId(chatAdapter.getChatID(lastPos)); } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } public static ChatroomFragment newInstance(int chatroomId) { ChatroomFragment f = new ChatroomFragment(); Bundle b = new Bundle(); b.putInt(Std.CHATROOM, chatroomId); f.setArguments(b); return f; } @Override public void onDestroy() { super.onDestroy(); Server.getCurrentServer().releaseChatManager(this); } @Override public Handler getCallbackHandler() { return Threading.getUiExecutor(); } }