Java tutorial
/* * Copyright (C) 2012 - 2013 Ohso Ltd * * 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 com.ohso.omgubuntu; import java.net.MalformedURLException; import java.net.URL; import android.annotation.SuppressLint; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.os.Message; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.webkit.ConsoleMessage; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.RelativeLayout; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.app.SherlockFragment; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.MenuItem; public class CommentsActivity extends SherlockFragmentActivity { public static final String COMMENTS_URL = "com.ohso.omgubuntu.CommentsActivity.COMMENTS_URL"; public static final String COMMENTS_IDENTIFIER = "com.ohso.omgubuntu.CommentsActivity.COMMENTS_IDENTIFIER"; private FragmentManager mFragmentManager; // Need to hold activity-wide references to the WebViews for setting content and onBackPressed() state private WebView commentView; private WebView popupView; private String mArticlePath; private String mIdentifier; // We need to make sure a popup that's activated is destroyed instead of just losing focus onBackPressed() @Override public void onBackPressed() { if (popupView != null && !popupView.isFocused()) { popupView.destroy(); } super.onBackPressed(); } @SuppressLint("SetJavaScriptEnabled") @Override public void onCreate(Bundle instance) { super.onCreate(instance); setContentView(R.layout.fragment_comments); setTitle("Comments"); ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); mArticlePath = getIntent().getStringExtra(COMMENTS_URL); mIdentifier = getIntent().getStringExtra(COMMENTS_IDENTIFIER); if (mArticlePath == null) finish(); mFragmentManager = getSupportFragmentManager(); // Setting up the default Disqus WebView WebViewFragment commentsFragment; if (instance != null) { commentsFragment = (WebViewFragment) getSupportFragmentManager().findFragmentByTag("comments"); commentView = commentsFragment.getWebView(); } else { commentsFragment = new WebViewFragment(); mFragmentManager.beginTransaction() .replace(R.id.comments_fragment_container, commentsFragment, "comments").commit(); commentView = new WebView(this); commentsFragment.setWebView(commentView); } if (commentView == null) commentView = new WebView(this); commentView.getSettings().setJavaScriptEnabled(true); commentView.getSettings().setSupportMultipleWindows(true); commentView.setWebChromeClient(new WebFragmentClient(this)); commentView.setWebViewClient(new WebClient(this)); if (instance == null) setContents(mArticlePath); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: finish(); return true; default: return super.onOptionsItemSelected(item); } } private void setContents(String articlePath) { StringBuilder content = new StringBuilder(); content.append("<!DOCTYPE html><head>"); content.append("<script type=\"text/javascript\">var disqus_shortname='" + getResources().getString(R.string.disqus_id) + "'; "); content.append("var disqus_url='" + getResources().getString(R.string.base_url) + articlePath + "'; "); content.append("var disqus_identifier='" + mIdentifier + " " + getResources().getString(R.string.base_url) + "/?p=" + mIdentifier + "';"); content.append("</script> "); content.append("</head>"); content.append("<body><div id='disqus_thread'>Loading...</div>"); content.append("<script type=\"text/javascript\" src=\"http://" + getResources().getString(R.string.disqus_id) + ".disqus.com/embed.js\"></script>"); content.append("</body></html>"); commentView.loadDataWithBaseURL(getResources().getString(R.string.base_url) + articlePath, content.toString(), "text/html", "UTF-8", getResources().getString(R.string.base_url) + articlePath); } private class WebFragmentClient extends WebChromeClient { private Context mContext; public WebFragmentClient(Context context) { mContext = context; } @Override public boolean onConsoleMessage(ConsoleMessage consoleMessage) { Log.d("OMG!", consoleMessage.message()); return super.onConsoleMessage(consoleMessage); } @SuppressLint("SetJavaScriptEnabled") @Override public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) { super.onCreateWindow(view, isDialog, isUserGesture, resultMsg); WebViewFragment popupFragment = new WebViewFragment(); popupView = new WebView(mContext); popupView.getSettings().setJavaScriptEnabled(true); popupView.setWebChromeClient(new WebChromeClient() { @Override public void onCloseWindow(WebView window) { mFragmentManager.popBackStack(); super.onCloseWindow(window); window.destroy(); } }); popupView.setWebViewClient(new WebClient(mContext)); popupFragment.setWebView(popupView); ((WebView.WebViewTransport) resultMsg.obj).setWebView(popupFragment.getWebView()); FragmentTransaction trans = mFragmentManager.beginTransaction(); trans.add(R.id.comments_fragment_container, popupFragment); trans.addToBackStack(null); trans.commitAllowingStateLoss(); //trans.commit(); resultMsg.sendToTarget(); return true; } @Override public void onCloseWindow(WebView window) { super.onCloseWindow(window); mFragmentManager.popBackStack(); } } private class WebClient extends WebViewClient { private Context mContext; public WebClient(Context context) { mContext = context; } @Override public void onPageFinished(WebView view, String url) { URL requestUrl = null; try { requestUrl = new URL(url); } catch (MalformedURLException e) { } if (requestUrl == null) return; if (requestUrl.getHost().equals("disqus.com") && requestUrl.getPath().startsWith("/logout")) { setContents(mArticlePath); } } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { Uri requestUrl = Uri.parse(url); if (requestUrl != null && requestUrl.getHost() != null) { if (requestUrl.getHost().equals("disqus.com")) { // Check for /logout and let it go through in a new popup, // then onPageFinish should popbackstack and reload page if (requestUrl.getPath().startsWith("/logout")) { commentView.loadUrl(url); return true; } } else if (requestUrl.getHost().equals("redirect.disqus.com")) { // Open a popup - if it leads to an article, finish() and open Article intent // else, popbackstack and open in browser. String alsoOnPath = Uri.parse(requestUrl.getQueryParameter("url")).getPath().toString(); alsoOnPath = alsoOnPath.substring(0, alsoOnPath.indexOf(":")); Intent intent = new Intent(mContext, ArticleActivity.class) .putExtra(ArticleActivity.INTERNAL_ARTICLE_PATH_INTENT, alsoOnPath); startActivity(intent); return true; } else if (requestUrl.getHost().equals("www.omgubuntu.co.uk") && (requestUrl.getPath() != null) && requestUrl.getPath().startsWith("/2")) { Intent intent = new Intent(mContext, ArticleActivity.class) .putExtra(ArticleActivity.INTERNAL_ARTICLE_PATH_INTENT, requestUrl.getPath()); startActivity(intent); return true; } else if ((requestUrl.getPath() != null) && requestUrl.getPath().endsWith(".rss")) { // Send to external with warning // Affects: http://omgubuntu.disqus.com/.../latest.rss ExternalLinkFragment.newInstance(requestUrl.toString()).show(mFragmentManager, "external_link"); return true; } } return false; } } public static class WebViewFragment extends SherlockFragment { private WebView mWebView; public WebViewFragment() { setRetainInstance(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { RelativeLayout v = (RelativeLayout) inflater.inflate(R.layout.fragment_comments_webview, container, false); if (mWebView == null) { Intent intent = getActivity().getIntent(); getActivity().finish(); startActivity(intent); return v; } else if (mWebView.getParent() != null) { ((RelativeLayout) mWebView.getParent()).removeView(mWebView); } v.addView(mWebView); return v; } public void setWebView(WebView webView) { mWebView = webView; } public WebView getWebView() { return mWebView; } } public static class ExternalLinkFragment extends DialogFragment { public static final String EXTERNAL_LINK_FRAGMENT_LINK = "com.ohso.omgubuntu.CommentsActivity.ExternalLinkFragment.EXTERNAL_LINK_FRAGMENT_LINK"; public static ExternalLinkFragment newInstance(String externalUrl) { ExternalLinkFragment fragment = new ExternalLinkFragment(); Bundle args = new Bundle(); args.putString(EXTERNAL_LINK_FRAGMENT_LINK, externalUrl); fragment.setArguments(args); return fragment; } private String getExternalLink() { return getArguments().getString(EXTERNAL_LINK_FRAGMENT_LINK); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setMessage(getResources().getString(R.string.external_link_error)); builder.setPositiveButton(getResources().getString(R.string.dialog_fragment_open), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent external = new Intent(Intent.ACTION_VIEW, Uri.parse(getExternalLink())); external.addCategory(Intent.CATEGORY_BROWSABLE); Intent chooser = Intent.createChooser(external, getResources().getString(R.string.external_link_dialog)); startActivity(chooser); } }); builder.setNegativeButton(getResources().getString(R.string.dialog_fragment_cancel), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); return builder.create(); } } }