Android Open Source - BBC-News-Reader Article Fragment

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License

The source code is released under:

Copyright (c) 2011, 2012, Digital Lizard (Oscar Key, Thomas Boby) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the...

Java Source Code

package com.digitallizard.bbcnewsreader.fragments;
//from w w w.  j  av  a2 s  .  co  m
import android.os.Bundle;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.TextView;

import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.digitallizard.bbcnewsreader.R;
import com.digitallizard.bbcnewsreader.ResourceService;
import com.digitallizard.bbcnewsreader.ServiceManager;
import com.digitallizard.bbcnewsreader.ServiceManager.MessageReceiver;
import com.digitallizard.bbcnewsreader.data.DatabaseHandler;
import com.digitallizard.bbcnewsreader.resource.web.HtmlParser;

public class ArticleFragment extends SherlockFragment implements MessageReceiver {
  /* constants */
  private static final int ID_NO_ARTICLE_LOADED = -10;
  
  /* variables */
  private DatabaseHandler database;
  private ServiceManager service;
  
  private WebView webView;
  private TextView loadingText;
  
  private int itemId;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    setHasOptionsMenu(true);
    
    database = new DatabaseHandler(getActivity());
    service = new ServiceManager(getActivity(), this);
    
    itemId = ID_NO_ARTICLE_LOADED;
    
    service.doBindService();
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.article, container, false);
    
    // create references to views
    loadingText = (TextView) view.findViewById(R.id.articleLoadingText);
    webView = (WebView) view.findViewById(R.id.articleWebView);
    
    webView.loadDataWithBaseURL(null, "Please select an article.", "text/html", "utf-8", null);
    
    return view;
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
    service.doUnbindService();
  }
  
  @Override
  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);
    // inflate the menu XML file
    inflater.inflate(R.menu.article_menu, menu);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.articleMenuItemReload) {
      // reload the current article
      loadArticle(itemId);
      return true;
    }
    else {
      return super.onOptionsItemSelected(item);
    }
  }
  
  public void displayArticle(int id) {
    itemId = id;
    
    if (itemId == ID_NO_ARTICLE_LOADED) {
      return;
    }
    
    // display the article if it is loaded, else load it
    byte[] html = database.getHtml(id);
    if (html != null) {
      showArticle(html);
    }
    else {
      loadArticle(id);
    }
  }
  
  private void showArticle(byte[] html) {
    // parse the html, load it in the webview
    String parsedHtml = modifyHtml(HtmlParser.parsePage(html));
    webView.loadDataWithBaseURL(null, parsedHtml, "text/html", "utf-8", null);
    
    // swap the loading text and webview
    loadingText.setVisibility(View.GONE);
    webView.setVisibility(View.VISIBLE);
    
    // scroll the webview up to the top
    webView.scrollTo(0, 0);
  }
  
  private String modifyHtml(String html) {
    // add css to prevent images being too wide
    String css = " <style type='text/css'> img { width:100%;} </style>";
    return html + css;
  }

  public void loadArticle(int id) {
    itemId = id;
    
    if (itemId == ID_NO_ARTICLE_LOADED) {
      return;
    }
    
    // make the loading text visible
    loadingText.setVisibility(View.VISIBLE);
    webView.setVisibility(View.GONE);
    
    // load the article, it will be displayed when it is returned by the service
    Bundle bundle = new Bundle();
    bundle.putInt(ResourceService.KEY_ITEM_ID, itemId);
    service.sendMessageToService(ResourceService.MSG_LOAD_ARTICLE, bundle);
  }
  
  public void handleMessage(Message msg) {
    switch (msg.what) {
    case ResourceService.MSG_ARTICLE_LOADED:
      // display the reloaded article
      displayArticle(itemId);
      break;
    }
  }
}

Java Source Code List

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