Java tutorial
/* * Copyright 2015 Eduard Scarlat * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package me.futuretechnology.blops.ui; import android.annotation.SuppressLint; import android.content.ContentValues; import android.content.Intent; import android.content.res.Resources; import android.database.Cursor; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.SwipeRefreshLayout; import android.text.TextUtils; import android.text.format.DateUtils; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.ListView; import android.widget.TextView; import com.escape.synder.DefaultContext; import com.escape.synder.DefaultParseContext; import com.github.mrengineer13.snackbar.SnackBar; import com.sun.syndication.feed.synd.SyndContent; import com.sun.syndication.feed.synd.SyndEntry; import com.sun.syndication.feed.synd.SyndFeed; import com.sun.syndication.feed.synd.SyndLink; import org.xml.sax.InputSource; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.regex.Pattern; import java.util.zip.GZIPInputStream; import de.greenrobot.event.EventBus; import me.futuretechnology.blops.R; import me.futuretechnology.blops.data.DB; import me.futuretechnology.blops.data.DbProvider; import me.futuretechnology.blops.core.FeedsManager; import me.futuretechnology.blops.ui.util.FeedEvent; import me.futuretechnology.blops.ui.util.LoaderIds; import me.futuretechnology.util.Entities; import me.futuretechnology.util.Log; import me.futuretechnology.util.ui.AltCursorAdapter; import me.futuretechnology.util.ui.AsyncLoader; import me.futuretechnology.util.ui.LoaderPayload; public class FeedFragment extends ListFragment implements AbsListView.OnScrollListener { private static final String TAG = "FEED.FRAGMENT"; private static final int INTERNAL_EMPTY_ID = 0x00ff0001; private static final int INTERNAL_PROGRESS_CONTAINER_ID = 0x00ff0002; private static final int INTERNAL_LIST_CONTAINER_ID = 0x00ff0003; private static final Pattern PATTERN_TAG_IMG = Pattern .compile("<img[^>]+src\\s*=\\s*['\"]([^'\"]+)['\"][^>]*>([^<]*</img>)*"); private static final Pattern PATTERN_EMPTY_TAGS = Pattern.compile("<[^>]*>\\s*</[^>]*>"); private static final Pattern PATTERN_TAG_BR = Pattern.compile("<br\\s*/?>"); private AltCursorAdapter mAdapter; public FeedFragment() { } public static FeedFragment newInstance(int position, String feedId, String feedUrl) { FeedFragment f = new FeedFragment(); Bundle b = new Bundle(); b.putInt("position", position); // FIXME constants & better names b.putString("feedId", feedId); b.putString("feedUrl", feedUrl); f.setArguments(b); return f; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mAdapter = new AltCursorAdapter(getActivity(), new int[] { R.layout.news_item }, null, new String[] { DB.News.TITLE, DB.News.PUBLISHED_DATE }, new int[] { R.id.news_title, R.id.news_date }); mAdapter.setViewBinder(new BinderNews(getActivity())); setListAdapter(mAdapter); initUI(); // on screen orientation changes, the loaders will return the last result, // without doing the background work again LoaderManager lm = getLoaderManager(); lm.initLoader(LoaderIds.CURSOR_GET_FEED + getArguments().getInt("position"), null, cursorCallbacks); } @SuppressWarnings("ResourceType") @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { @SuppressLint("InflateParams") View v = inflater.inflate(R.layout.base_list, null); v.findViewById(android.R.id.empty).setId(INTERNAL_EMPTY_ID); v.findViewById(R.id.progress_container).setId(INTERNAL_PROGRESS_CONTAINER_ID); v.findViewById(R.id.list_container).setId(INTERNAL_LIST_CONTAINER_ID); return v; } private void initUI() { if (getView() == null) { return; } // start out with a progress indicator setListShownNoAnimation(false); TypedValue typedValue = new TypedValue(); Resources.Theme theme = getActivity().getTheme(); // noinspection ResourceType SwipeRefreshLayout swipeLayout = (SwipeRefreshLayout) getView().findViewById(INTERNAL_LIST_CONTAINER_ID); theme.resolveAttribute(R.attr.colorPrimary, typedValue, true); swipeLayout.setColorSchemeResources(typedValue.resourceId); swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { LoaderManager lm = getLoaderManager(); lm.restartLoader(LoaderIds.ASYNC_GET_FEED + getArguments().getInt("position"), null, loaderCallbacks); } }); ListView listView = getListView(); listView.setVelocityScale(2.0f); setEmptyText(getText(R.string.empty_news)); TextView tvEmpty = (TextView) listView.getEmptyView(); tvEmpty.setTextAppearance(getActivity(), R.style.TextAppearance_AppCompat_Title); theme.resolveAttribute(android.R.attr.textColorSecondary, typedValue, true); tvEmpty.setTextColor(getResources().getColor(typedValue.resourceId)); listView.setOnScrollListener(this); // listView().setOnCreateContextMenuListener(this); } @Override public void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); Cursor c = mAdapter.getCursor(); Intent iNewsInfo = new Intent(getActivity(), NewsInfoActivity.class); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_ID, c.getString(c.getColumnIndex(DB.MyNews.ID))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_FEED_ID, getArguments().getString("feedId")); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_AUTHOR, c.getString(c.getColumnIndex(DB.News.AUTHOR))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_TITLE, c.getString(c.getColumnIndex(DB.News.TITLE))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_DATE, c.getLong(c.getColumnIndex(DB.News.PUBLISHED_DATE))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_CONTENT_VALUES, c.getString(c.getColumnIndex(DB.News.CONTENT_VALUES))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_URL, c.getString(c.getColumnIndex(DB.News.URL))); iNewsInfo.putExtra(NewsInfoActivity.EXTRA_IS_BOOKMARK, c.getInt(c.getColumnIndex(DB.MyNews.IS_BOOKMARK)) > 0); startActivity(iNewsInfo); if (c.getInt(c.getColumnIndex(DB.MyNews.IS_READ)) == 0) { LoaderManager lm = getLoaderManager(); Bundle b = new Bundle(); b.putString("newsId", c.getString(c.getColumnIndex(DB.MyNews.ID))); lm.restartLoader(LoaderIds.ASYNC_UPDATE_READ, b, loaderCallbacks); } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (totalItemCount > 0) { int pos = getArguments().getInt("position"); if (pos > 0) { EventBus.getDefault().post(new FeedEvent(FeedEvent.TYPE_UPDATE_NEW, pos, firstVisibleItem)); // FIXME optimize: send event when scrolling up only } } } public void refresh() { Log.i(TAG, "refresh: ", getArguments().getString("feedId")); if (getView() == null) { Log.i(TAG, "refresh denied: ", getArguments().getString("feedId")); return; } // noinspection ResourceType SwipeRefreshLayout swipeLayout = (SwipeRefreshLayout) getView().findViewById(INTERNAL_LIST_CONTAINER_ID); swipeLayout.setRefreshing(true); LoaderManager lm = getLoaderManager(); lm.restartLoader(LoaderIds.ASYNC_GET_FEED + getArguments().getInt("position"), null, loaderCallbacks); } private void hideLoading() { // the list should now be shown setListShownNoAnimation(true); if (getView() != null) { // noinspection ResourceType SwipeRefreshLayout swipeLayout = (SwipeRefreshLayout) getView() .findViewById(INTERNAL_LIST_CONTAINER_ID); swipeLayout.setRefreshing(false); } } private final LoaderCallbacks<Cursor> cursorCallbacks = new LoaderCallbacks<Cursor>() { @Override public Loader<Cursor> onCreateLoader(int id, Bundle data) { if (id == LoaderIds.CURSOR_GET_FEED + getArguments().getInt("position")) { String[] projection = { DB.MyNews.TABLE_NAME + '.' + DB.MyNews._ID, DB.MyNews.ID, DB.News.AUTHOR, DB.News.TITLE, DB.News.PUBLISHED_DATE, DB.News.CONTENT_VALUES, DB.News.URL, DB.MyNews.IS_READ, DB.MyNews.IS_BOOKMARK }; String selection = DB.MyNews.FEED_ID + "=? AND " + DB.News.SAVED_DATE + ">=?"; String[] selectionArgs = { getArguments().getString("feedId"), String.valueOf(System.currentTimeMillis() - DateUtils.DAY_IN_MILLIS) }; String sortOrder = DB.News.PUBLISHED_DATE + " DESC"; return new CursorLoader(getActivity(), DB.MyNews.URI, projection, selection, selectionArgs, sortOrder); } return null; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor c) { int pos = getArguments().getInt("position"); if (loader.getId() == LoaderIds.CURSOR_GET_FEED + pos) { int count = mAdapter.getCount(); if (count > 0) { ListView listView = getListView(); // save listview state Parcelable state = listView.onSaveInstanceState(); mAdapter.swapCursor(c); // restore previous state (including selected item index and scroll position) listView.onRestoreInstanceState(state); setListShownNoAnimation(true); int countNew = mAdapter.getCount() - count; if (pos > 0 && countNew > 0) { EventBus.getDefault().post(new FeedEvent(FeedEvent.TYPE_SHOW_NEW, pos, countNew)); } } else { mAdapter.swapCursor(c); setListShownNoAnimation(true); } LoaderManager lm = getLoaderManager(); if (lm.getLoader(LoaderIds.ASYNC_GET_FEED + pos) == null) // first query { // if (pos == 1 && FeedsPagerAdapter.firstTime.get(1)) { // FeedsPagerAdapter.firstTime.put(1, false); // refresh(); // } else { // hideLoading(); // } } else { hideLoading(); } } } @Override public void onLoaderReset(Loader<Cursor> loader) { mAdapter.swapCursor(null); } }; private final LoaderManager.LoaderCallbacks<LoaderPayload> loaderCallbacks = new LoaderCallbacks<LoaderPayload>() { @Override public Loader<LoaderPayload> onCreateLoader(int id, final Bundle data) { int pos = getArguments().getInt("position"); if (id == LoaderIds.ASYNC_GET_FEED + pos) { return new AsyncLoader<LoaderPayload>(getActivity()) { @Override public LoaderPayload loadInBackground() { String url = getArguments().getString("feedUrl"); HttpURLConnection conn = null; InputStream inStream = null; BufferedReader reader = null; SyndFeed sf = null; try { conn = setupConnection(url); String contentType = conn.getContentType(); if (contentType != null && contentType.startsWith("text/html")) { String encoding = conn.getContentEncoding(); if ("gzip".equals(encoding) || "x-gzip".equals(encoding)) { reader = new BufferedReader(new InputStreamReader( new GZIPInputStream(conn.getInputStream()), getCharset(conn))); } else { reader = new BufferedReader( new InputStreamReader(conn.getInputStream(), getCharset(conn))); } String line; boolean isBody = false; int pos; int posStart = -1; while ((line = reader.readLine()) != null) { if (line.contains("<body") || line.contains("<BODY")) { // body starts... stop looking for alt links isBody = true; break; } pos = line.indexOf("<link "); if (pos < 0) { // no link on this line, keep looking pos = line.indexOf("<LINK "); if (pos < 0) { // no link on this line, keep looking continue; } } // if link type is not alternate, keep looking if (line.indexOf(" rel=\"alternate\"", pos) < 0) { if (line.indexOf(" rel='alternate'", pos) < 0) { if (line.indexOf(" rel=alternate", pos) < 0) { if (line.indexOf(" REL=\"alternate\"", pos) < 0) { if (line.indexOf(" REL='alternate'", pos) < 0) { if (line.indexOf(" REL=alternate", pos) < 0) { continue; } } } } } } int quote = '\"'; posStart = line.indexOf("href=\"", pos); if (posStart < 0) { posStart = line.indexOf("HREF=\"", pos); if (posStart < 0) { quote = '\''; posStart = line.indexOf("href='", pos); if (posStart < 0) { posStart = line.indexOf("HREF='", pos); if (posStart < 0) { continue; } } } } String link = line.substring(posStart + 6, line.indexOf(quote, posStart + 10)) .replace("&", "&"); if (link.startsWith("/")) { link = url + link; } else if (!link.startsWith("http://") && !link.startsWith("https://") && !link.startsWith("HTTP://") && !link.startsWith("HTTPS://")) { link = url + '/' + link; } getArguments().putString("feedUrl", link); FeedsManager feedsManager = FeedsManager.getInstance(); feedsManager.updateFeed(getArguments().getString("feedId"), link, false); reader.close(); conn.disconnect(); conn = setupConnection(link); // contentType = conn.getContentType(); break; } if (isBody) { while ((line = reader.readLine()) != null) { pos = line.indexOf("<a "); if (pos < 0) { // no link on this line, keep looking pos = line.indexOf("<A "); if (pos < 0) { // no link on this line, keep looking continue; } } // if link class is not rss, keep looking if (line.indexOf(" class=\"rss\"", pos) < 0) { if (line.indexOf(" class='rss'", pos) < 0) { if (line.indexOf(" class=rss", pos) < 0) { if (line.indexOf(" CLASS=\"rss\"", pos) < 0) { if (line.indexOf(" CLASS='rss'", pos) < 0) { if (line.indexOf(" CLASS=rss", pos) < 0) { continue; } } } } } } int quote = '\"'; posStart = line.indexOf("href=\"", pos); if (posStart < 0) { posStart = line.indexOf("HREF=\"", pos); if (posStart < 0) { quote = '\''; posStart = line.indexOf("href='", pos); if (posStart < 0) { posStart = line.indexOf("HREF='", pos); if (posStart < 0) { continue; } } } } String link = line .substring(posStart + 6, line.indexOf(quote, posStart + 10)) .replace("&", "&"); if (link.startsWith("/")) { link = url + link; } else if (!link.startsWith("http://") && !link.startsWith("https://") && !link.startsWith("HTTP://") && !link.startsWith("HTTPS://")) { link = url + '/' + link; } if (link.equals(getArguments().getString("feedUrl"))) { posStart = -1; continue; } getArguments().putString("feedUrl", link); FeedsManager feedsManager = FeedsManager.getInstance(); feedsManager.updateFeed(getArguments().getString("feedId"), link, false); reader.close(); conn.disconnect(); conn = setupConnection(link); // contentType = conn.getContentType(); break; } } if (posStart < 0) { // this indicates a wrong configured feed reader.close(); conn.disconnect(); conn = setupConnection(url); // contentType = conn.getContentType(); } } String encoding = conn.getContentEncoding(); if ("gzip".equals(encoding) || "x-gzip".equals(encoding)) { inStream = new GZIPInputStream(conn.getInputStream()); } else { inStream = conn.getInputStream(); } reader = new BufferedReader(new InputStreamReader(inStream, getCharset(conn))); InputSource is = new InputSource(reader); is.setEncoding(getCharset(conn)); DefaultContext dsc = new DefaultContext(getResources().openRawResource(R.raw.synder)); DefaultParseContext sfi = new DefaultParseContext(dsc); sf = sfi.parse(is); } catch (Exception e) { Log.printStackTrace(TAG, e); } finally { if (reader != null) { try { reader.close(); } catch (IOException ioe) { // Log.printStackTrace(TAG, ioe); } } if (inStream != null) { try { inStream.close(); } catch (IOException ioe) { // Log.printStackTrace(TAG, ioe); } } if (conn != null) { conn.disconnect(); } } if (sf == null) { return new LoaderPayload(LoaderPayload.STATUS_ERROR); } String feedId = getArguments().getString("feedId"); List<SyndEntry> news = sf.getEntries(); ArrayList<ContentValues> values = new ArrayList<ContentValues>(news.size()); ArrayList<ContentValues> myValues = new ArrayList<ContentValues>(news.size()); for (SyndEntry entry : news) { ContentValues v = new ContentValues(14); ContentValues myV = new ContentValues(6); v.put(DB.News.AUTHOR, entry.getAuthor()); String title = entry.getTitle().trim(); v.put(DB.News.TITLE, Entities.HTML40.unescape(title)); Date d = entry.getPublishedDate(); if (d != null) { v.put(DB.News.PUBLISHED_DATE, d.getTime()); } else { v.put(DB.News.PUBLISHED_DATE, 0); } v.put(DB.News.FEED_ID, feedId); myV.put(DB.MyNews.FEED_ID, feedId); List<SyndContent> contents = entry.getContents(); if (contents.isEmpty()) { v.put(DB.News.CONTENT_VALUES, ""); } else { StringBuilder sb = new StringBuilder(256); for (SyndContent content : contents) { String value = content.getValue(); if (value != null) { // some cleaning up... ugly code follows String txt = PATTERN_TAG_IMG.matcher(value).replaceAll(""); txt = PATTERN_TAG_BR.matcher(txt).replaceAll("\n"); txt = PATTERN_EMPTY_TAGS.matcher(txt).replaceAll(""); txt = PATTERN_EMPTY_TAGS.matcher(txt).replaceAll(""); // pff... txt = txt.trim(); int len = txt.length(); for (int i = 0; i < len; ++i) { char c = txt.charAt(i); if (i < 2) { sb.append(c); continue; } if (c != '\n') { sb.append(c); continue; } // else: we've reached a \n if (c != txt.charAt(i - 1)) { if (i < 4 || txt.charAt(i - 1) != '>' || txt.charAt(i - 2) != 'p' || txt.charAt(i - 3) != '/' || txt.charAt(i - 4) != '<') { if (i > len - 4 || txt.charAt(i + 1) != '<' || txt.charAt(i + 2) != 'p' || txt.charAt(i + 3) != '>') { sb.append('<'); sb.append('b'); sb.append('r'); sb.append('>'); } // else skip \n if it's before <p> } // else skip \n if it's after </p> continue; } // else: we've reached a 2nd consecutive \n if (c != txt.charAt(i - 2)) { sb.append('<'); sb.append('b'); sb.append('r'); sb.append('>'); } // else: we've reached the 3rd consecutive \n // skip the 3rd consecutive \n } sb.append('<'); sb.append('b'); sb.append('r'); sb.append('>'); } } sb.setLength(sb.length() - 4); v.put(DB.News.CONTENT_VALUES, sb.toString()); } List<SyndLink> links = entry.getLinks(); if (links != null && !links.isEmpty()) { SyndLink link = entry.getLinks().get(0); if (link != null) { v.put(DB.News.URL, link.getHref()); } } String uri = entry.getUri(); if (TextUtils.isEmpty(uri)) { if (links != null) { for (SyndLink link : links) { if (link.getType().equals("guid")) { uri = link.getHref(); } // else { // Log.i("BLOPS", "type: ", link.getType()); // } } } else { Log.w(TAG, "oops!"); } } if (TextUtils.isEmpty(uri)) { if (links != null && !links.isEmpty()) { SyndLink link = entry.getLinks().get(0); if (link != null) { uri = link.getHref(); } } } v.put(DB.News.SAVED_DATE, System.currentTimeMillis()); v.put(DB.News.ID, uri); myV.put(DB.MyNews.ID, uri); StringBuilder sbUniqueId = new StringBuilder(64); sbUniqueId.append(uri); sbUniqueId.append(feedId); int uniqueId = sbUniqueId.toString().hashCode(); v.put(DB.News._ID, uniqueId); v.put(DB.MyNews._ID, uniqueId); myV.put(DB.MyNews.IS_READ, 0); myV.put(DB.MyNews.IS_BOOKMARK, 0); values.add(v); myValues.add(myV); } DbProvider.bulkReplace(DB.News.URI, values.toArray(new ContentValues[values.size()])); DbProvider.contentResolver.bulkInsert(DB.MyNews.URI, myValues.toArray(new ContentValues[myValues.size()])); return new LoaderPayload(LoaderPayload.STATUS_OK); } }; } if (id == LoaderIds.ASYNC_UPDATE_READ) { return new AsyncLoader<LoaderPayload>(getActivity()) { @Override public LoaderPayload loadInBackground() { String newsId = data.getString("newsId"); String feedId = getArguments().getString("feedId"); ContentValues v = new ContentValues(2); v.put(DB.MyNews.IS_READ, 1); if (DbProvider.contentResolver.update(DB.MyNews.URI, v, DB.MyNews.ID + "=? AND " + DB.MyNews.FEED_ID + "=?", new String[] { newsId, feedId }) > 0) { DbProvider.contentResolver.notifyChange(DB.MyNews.URI, null, false); return new LoaderPayload(LoaderPayload.STATUS_OK); } return new LoaderPayload(LoaderPayload.STATUS_ERROR); } }; } return null; } @Override public void onLoadFinished(Loader<LoaderPayload> loader, LoaderPayload payload) { int id = loader.getId(); int pos = getArguments().getInt("position"); if (id == LoaderIds.ASYNC_GET_FEED + pos) { if (payload.getStatus() == LoaderPayload.STATUS_OK) { getLoaderManager().restartLoader(LoaderIds.CURSOR_GET_FEED + pos, null, cursorCallbacks); } else { // FIXME empty view not shown hideLoading(); if (getView() != null) { new SnackBar.Builder(getActivity().getApplicationContext(), getView()) .withMessageId(R.string.error_news).show(); } } } else if (id == LoaderIds.ASYNC_UPDATE_READ) { if (payload.getStatus() == LoaderPayload.STATUS_OK) { getLoaderManager().restartLoader(LoaderIds.CURSOR_GET_FEED + pos, null, cursorCallbacks); } } } @Override public void onLoaderReset(Loader<LoaderPayload> loader) { } }; private HttpURLConnection setupConnection(String url) throws IOException { HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection(); conn.setRequestProperty("Accept-Encoding", "gzip,deflate"); conn.setRequestProperty("Accept-Charset", "utf-8,*"); // conn.setInstanceFollowRedirects(false); conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.0; ru; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 (.NET CLR 3.5.30729)"); conn.connect(); return conn; } private String getCharset(HttpURLConnection conn) { String contentType = conn.getContentType(); String[] values = contentType.split(";"); // values.length must be equal to 2 for (String value : values) { value = value.trim(); if (value.toLowerCase().startsWith("charset=")) { return value.substring("charset=".length()); } } return "UTF-8"; // just in case... } }