Java tutorial
/** * Android ownCloud News * * @author David Luhmer * @copyright 2013 David Luhmer david-dev@live.de * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details. * * You should have received a copy of the GNU Affero General Public * License along with this library. If not, see <http://www.gnu.org/licenses/>. * */ package com.quarterfull.newsAndroid; import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Bitmap; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.support.v4.content.ContextCompat; import android.text.format.DateUtils; import android.util.Log; import android.view.ContextMenu; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.webkit.ConsoleMessage; import android.webkit.WebChromeClient; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.ProgressBar; import com.nostra13.universalimageloader.cache.disc.DiskCache; import com.nostra13.universalimageloader.core.ImageLoader; import org.apache.commons.lang3.StringEscapeUtils; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.select.Elements; import java.io.File; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Date; import java.util.List; import butterknife.Bind; import butterknife.ButterKnife; import com.quarterfull.newsAndroid.database.model.Feed; import com.quarterfull.newsAndroid.database.model.RssItem; import com.quarterfull.newsAndroid.helper.AsyncTaskHelper; import com.quarterfull.newsAndroid.helper.ColorHelper; import com.quarterfull.newsAndroid.helper.ImageHandler; import com.quarterfull.newsAndroid.helper.ThemeChooser; public class NewsDetailFragment extends Fragment { public static final String ARG_SECTION_NUMBER = "ARG_SECTION_NUMBER"; public final String TAG = getClass().getCanonicalName(); public static int background_color = Integer.MIN_VALUE; @Bind(R.id.webview) WebView mWebView; @Bind(R.id.progressBarLoading) ProgressBar mProgressBarLoading; @Bind(R.id.progressbar_webview) ProgressBar mProgressbarWebView; private int section_number; public List<String> urls = new ArrayList<>(); protected String html; public NewsDetailFragment() { //setRetainInstance(true); } public int getSectionNumber() { return section_number; } @Override public void onResume() { super.onResume(); ResumeCurrentPage(); } @Override public void onPause() { super.onPause(); PauseCurrentPage(); } @Override public void onDestroy() { super.onDestroy(); if (mWebView != null) { mWebView.destroy(); } } public void PauseCurrentPage() { if (mWebView != null) { mWebView.onPause(); mWebView.pauseTimers(); } } public void ResumeCurrentPage() { if (mWebView != null) { mWebView.onResume(); mWebView.resumeTimers(); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_news_detail, container, false); section_number = (Integer) getArguments().get(ARG_SECTION_NUMBER); ButterKnife.bind(this, rootView); startLoadRssItemToWebViewTask(); return rootView; } public void startLoadRssItemToWebViewTask() { AsyncTaskHelper.StartAsyncTask(new LoadRssItemToWebViewAsyncTask()); } private class LoadRssItemToWebViewAsyncTask extends AsyncTask<Void, Void, String> { @Override protected void onPreExecute() { NewsDetailActivity ndActivity = ((NewsDetailActivity) getActivity()); if (background_color != Integer.MIN_VALUE && ThemeChooser.isDarkTheme(ndActivity)) { mWebView.setBackgroundColor(background_color); ndActivity.mViewPager.setBackgroundColor(background_color); } init_webView(); mWebView.setVisibility(View.GONE); mProgressBarLoading.setVisibility(View.VISIBLE); super.onPreExecute(); } @Override protected String doInBackground(Void... voids) { NewsDetailActivity ndActivity = ((NewsDetailActivity) getActivity()); RssItem rssItem = ndActivity.rssItems.get(section_number); return getHtmlPage(ndActivity, rssItem, true); } @Override protected void onPostExecute(String htmlPage) { mWebView.setVisibility(View.VISIBLE); mProgressBarLoading.setVisibility(View.GONE); SetSoftwareRenderModeForWebView(htmlPage, mWebView); html = htmlPage; mWebView.loadDataWithBaseURL("file:///android_asset/", htmlPage, "text/html", "UTF-8", ""); super.onPostExecute(htmlPage); } } /** * This function has no effect on devices with api level < HONEYCOMB * @param htmlPage * @param webView */ public static void SetSoftwareRenderModeForWebView(String htmlPage, WebView webView) { if (htmlPage.contains(".gif")) { webView.setLayerType(WebView.LAYER_TYPE_SOFTWARE, null); Log.v("NewsDetailFragment", "Using LAYER_TYPE_SOFTWARE"); } else { //webView.setLayerType(WebView.LAYER_TYPE_HARDWARE, null); //Log.v("NewsDetailFragment", "Using LAYER_TYPE_HARDWARE"); if (webView.getLayerType() == WebView.LAYER_TYPE_HARDWARE) { Log.v("NewsDetailFragment", "Using LAYER_TYPE_HARDWARE"); } else if (webView.getLayerType() == WebView.LAYER_TYPE_SOFTWARE) { Log.v("NewsDetailFragment", "Using LAYER_TYPE_SOFTWARE"); } else { Log.v("NewsDetailFragment", "Using LAYER_TYPE_DEFAULT"); } } } boolean changedUrl = false; @SuppressLint("SetJavaScriptEnabled") private void init_webView() { int backgroundColor = ColorHelper.getColorFromAttribute(getContext(), R.attr.news_detail_background_color); mWebView.setBackgroundColor(backgroundColor); WebSettings webSettings = mWebView.getSettings(); webSettings.setJavaScriptEnabled(true); webSettings.setAllowFileAccess(true); webSettings.setDomStorageEnabled(true); webSettings.setJavaScriptCanOpenWindowsAutomatically(false); webSettings.setSupportMultipleWindows(false); webSettings.setSupportZoom(false); webSettings.setAppCacheEnabled(true); registerForContextMenu(mWebView); mWebView.setWebChromeClient(new WebChromeClient() { @Override public boolean onConsoleMessage(ConsoleMessage cm) { Log.v(TAG, cm.message() + " at " + cm.sourceId() + ":" + cm.lineNumber()); return true; } @Override public void onProgressChanged(WebView view, int progress) { if (progress < 100 && mProgressbarWebView.getVisibility() == ProgressBar.GONE) { mProgressbarWebView.setVisibility(ProgressBar.VISIBLE); } mProgressbarWebView.setProgress(progress); if (progress == 100) { mProgressbarWebView.setVisibility(ProgressBar.GONE); //The following three lines are a workaround for websites which don't use a background color int bgColor = ContextCompat.getColor(getContext(), R.color.slider_listview_text_color_dark_theme); NewsDetailActivity ndActivity = ((NewsDetailActivity) getActivity()); mWebView.setBackgroundColor(bgColor); ndActivity.mViewPager.setBackgroundColor(bgColor); if (ThemeChooser.isDarkTheme(getActivity())) { mWebView.setBackgroundColor( ContextCompat.getColor(getContext(), android.R.color.transparent)); } } } }); mWebView.setWebViewClient(new WebViewClient() { @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { if (changedUrl) { changedUrl = false; if (!url.equals("file:///android_asset/") && (urls.isEmpty() || !urls.get(0).equals(url))) { urls.add(0, url); Log.v(TAG, "Page finished (added): " + url); } } super.onPageStarted(view, url, favicon); } }); mWebView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (v.getId() == R.id.webview && event.getAction() == MotionEvent.ACTION_DOWN) { changedUrl = true; } return false; } }); } public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { if (v instanceof WebView) { WebView.HitTestResult result = ((WebView) v).getHitTestResult(); if (result != null) { int type = result.getType(); Document htmldoc = Jsoup.parse(html); FragmentTransaction ft = getFragmentManager().beginTransaction(); if (type == WebView.HitTestResult.IMAGE_TYPE || type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) { String imageUrl = result.getExtra(); if (imageUrl.startsWith("http") || imageUrl.startsWith("file")) { URL mImageUrl; String imgtitle; String imgaltval; String imgsrcval; imgsrcval = imageUrl.substring(imageUrl.lastIndexOf('/') + 1, imageUrl.length()); Elements imgtag = htmldoc.getElementsByAttributeValueContaining("src", imageUrl); try { imgtitle = imgtag.first().attr("title"); } catch (NullPointerException e) { imgtitle = ""; } try { imgaltval = imgtag.first().attr("alt"); } catch (NullPointerException e) { imgaltval = ""; } try { mImageUrl = new URL(imageUrl); } catch (MalformedURLException e) { return; } String title = imgsrcval; int titleIcon = android.R.drawable.ic_menu_gallery; String text = (imgtitle.isEmpty()) ? imgaltval : imgtitle; // Create and show the dialog. DialogFragment newFragment = NewsDetailImageDialogFragment.newInstanceImage(title, titleIcon, text, mImageUrl); newFragment.show(ft, "menu_fragment_dialog"); } } else if (type == WebView.HitTestResult.SRC_ANCHOR_TYPE) { String url = result.getExtra(); URL mUrl; String text; try { Elements urltag = htmldoc.getElementsByAttributeValueContaining("href", url); text = urltag.text(); mUrl = new URL(url); } catch (MalformedURLException e) { return; } // Create and show the dialog. DialogFragment newFragment = NewsDetailImageDialogFragment.newInstanceUrl(text, mUrl.toString()); newFragment.show(ft, "menu_fragment_dialog"); } //else if (type == WebView.HitTestResult.EMAIL_TYPE) { } //else if (type == WebView.HitTestResult.GEO_TYPE) { } //else if (type == WebView.HitTestResult.PHONE_TYPE) { } //else if (type == WebView.HitTestResult.EDIT_TEXT_TYPE) { } } } } @SuppressLint("SimpleDateFormat") public static String getHtmlPage(Context context, RssItem rssItem, boolean showHeader) { String feedTitle = "Undefined"; String favIconUrl = null; Feed feed = rssItem.getFeed(); int[] colors = ColorHelper.getColorsFromAttributes(context, R.attr.dividerLineColor, R.attr.rssItemListBackground); int feedColor = colors[0]; if (feed != null) { feedTitle = StringEscapeUtils.escapeHtml4(feed.getFeedTitle()); favIconUrl = feed.getFaviconUrl(); if (feed.getAvgColour() != null) feedColor = Integer.parseInt(feed.getAvgColour()); } if (favIconUrl != null) { DiskCache diskCache = ImageLoader.getInstance().getDiskCache(); File file = diskCache.get(favIconUrl); if (file != null) favIconUrl = "file://" + file.getAbsolutePath(); } else { favIconUrl = "file:///android_res/drawable/default_feed_icon_light.png"; } String body_id; if (ThemeChooser.isDarkTheme(context)) { body_id = "darkTheme"; } else body_id = "lightTheme"; boolean isRightToLeft = context.getResources().getBoolean(R.bool.is_right_to_left); String rtlClass = isRightToLeft ? "rtl" : ""; String borderSide = isRightToLeft ? "right" : "left"; StringBuilder builder = new StringBuilder(); builder.append( "<html><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=0\" />"); builder.append("<link rel=\"stylesheet\" type=\"text/css\" href=\"web.css\" />"); builder.append("<style type=\"text/css\">"); builder.append(String.format( "#top_section { border-%s: 4px solid %s; border-bottom: 1px solid %s; background: %s }", borderSide, ColorHelper.getCssColor(feedColor), ColorHelper.getCssColor(colors[0]), ColorHelper.getCssColor(colors[1]))); builder.append("</style>"); builder.append(String.format("</head><body id=\"%s\" class=\"%s\">", body_id, rtlClass)); if (showHeader) { builder.append("<div id=\"top_section\">"); builder.append("<div id=\"header\">"); String title = StringEscapeUtils.escapeHtml4(rssItem.getTitle()); String linkToFeed = StringEscapeUtils.escapeHtml4(rssItem.getLink()); builder.append(String.format("<a href=\"%s\">%s</a>", linkToFeed, title)); builder.append("</div>"); String authorOfArticle = StringEscapeUtils.escapeHtml4(rssItem.getAuthor()); if (authorOfArticle != null) if (!authorOfArticle.trim().equals("")) feedTitle += " - " + authorOfArticle.trim(); builder.append("<div id=\"header_small_text\">"); builder.append("<div id=\"subscription\">"); builder.append(String.format("<img id=\"imgFavicon\" src=\"%s\" />", favIconUrl)); builder.append(feedTitle.trim()); builder.append("</div>"); Date date = rssItem.getPubDate(); if (date != null) { String dateString = (String) DateUtils.getRelativeTimeSpanString(date.getTime()); builder.append("<div id=\"datetime\">"); builder.append(dateString); builder.append("</div>"); } builder.append("</div>"); builder.append("</div>"); } String description = rssItem.getBody(); builder.append("<div id=\"content\">"); builder.append(getDescriptionWithCachedImages(description).trim()); builder.append("</div>"); builder.append("</body></html>"); String htmlData = builder.toString().replaceAll("\"//", "\"https://"); return htmlData; } private static String getDescriptionWithCachedImages(String text) { List<String> links = ImageHandler.getImageLinksFromText(text); DiskCache diskCache = ImageLoader.getInstance().getDiskCache(); for (String link : links) { link = link.trim(); try { File file = diskCache.get(link); if (file != null) text = text.replace(link, "file://" + file.getAbsolutePath()); } catch (Exception ex) { ex.printStackTrace(); } } return text; } static String getTextFromAssets(String fileName, Context context) { InputStream input; try { input = context.getAssets().open(fileName); int size = input.available(); byte[] buffer = new byte[size]; input.read(buffer); input.close(); // byte buffer into a string return new String(buffer); } catch (Exception ex) { ex.printStackTrace(); } return ""; } private static String SearchString(String data, String startString, String endString) { int start = data.indexOf(startString) + startString.length(); int end = data.indexOf(endString, start); if (start != (-1 + startString.length()) && end != -1) data = data.substring(start, end).trim(); return data; } private static String convertHexColorFrom3To6Characters(String color) { for (int i = 1; i < 6; i += 2) color = color.substring(0, i) + color.charAt(i) + color.substring(i); return color; } }