Java tutorial
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In no event and under no legal theory, * whether in tort (including negligence), contract, or otherwise, * unless required by applicable law (such as deliberate and grossly * negligent acts) or agreed to in writing, shall any Contributor be * liable to You for damages, including any direct, indirect, special, * incidental, or consequential damages of any character arising as a * result of this License or out of the use or inability to use the * Work (including but not limited to damages for loss of goodwill, * work stoppage, computer failure or malfunction, or any and all * other commercial damages or losses), even if such Contributor * has been advised of the possibility of such damages. * * 9. Accepting Warranty or Additional Liability. While redistributing * the Work or Derivative Works thereof, You may choose to offer, * and charge a fee for, acceptance of support, warranty, indemnity, * or other liability obligations and/or rights consistent with this * License. However, in accepting such obligations, You may act only * on Your own behalf and on Your sole responsibility, not on behalf * of any other Contributor, and only if You agree to indemnify, * defend, and hold each Contributor harmless for any liability * incurred by, or claims asserted against, such Contributor by reason * of your accepting any such warranty or additional liability. * * END OF TERMS AND CONDITIONS * * * Copyright (c) Bug 2016. * * */ package cn.scujcc.bug.bitcoinplatformandroid.fragment; import android.content.Context; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.Snackbar; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.squareup.picasso.Picasso; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.select.Elements; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.StringReader; import java.util.ArrayList; import java.util.List; import cn.scujcc.bug.bitcoinplatformandroid.R; import cn.scujcc.bug.bitcoinplatformandroid.activity.NewsDetailsActivity; import cn.scujcc.bug.bitcoinplatformandroid.model.News; import cn.scujcc.bug.bitcoinplatformandroid.util.NetWork; /** * Created by lilujia on 16/3/27. * <p> * */ public class QuotationInformationFragment extends BaseFragment implements SwipeRefreshLayout.OnRefreshListener { private static final String NEWS_RSS_URL = "http://www.bitecoin.com/feed"; public static final String NEWS_CACHE_NAME = "news_cache"; private static final String TAG = "QuotationInformation"; private boolean isForce = false; private RecyclerView mRecyclerView; private RecyclerView.Adapter mAdapter; private RecyclerView.LayoutManager mLayoutManager; private SwipeRefreshLayout mSwipeRefreshWidget; private TextView mNoneText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragmnet_quotationinformation, container, false); setHasOptionsMenu(true); setTitle(view, ""); mNoneText = (TextView) view.findViewById(R.id.none_text); mSwipeRefreshWidget = (SwipeRefreshLayout) view.findViewById(R.id.swipe_refresh_widget); mSwipeRefreshWidget.setOnRefreshListener(this); mSwipeRefreshWidget.setColorSchemeResources(R.color.colorPrimary, R.color.colorPrimaryDark); mSwipeRefreshWidget.setProgressViewOffset(false, 0, (int) TypedValue .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics())); mRecyclerView = (RecyclerView) view.findViewById(R.id.my_recycler_view); //???,? mRecyclerView.setHasFixedSize(true); // mLayoutManager = new LinearLayoutManager(getActivity()); mRecyclerView.setLayoutManager(mLayoutManager); //Adapter mAdapter = new CardAdapter(); mRecyclerView.setAdapter(mAdapter); //?? NewsAsyncTask task = new NewsAsyncTask(); task.execute(); mSwipeRefreshWidget.setRefreshing(true); return view; } private List<News> getNews(String xmlString) throws IOException, XmlPullParserException { List<News> list; News news = null; // XmlPullParserFactory XmlPullParserFactory pullParserFactory = XmlPullParserFactory.newInstance(); // ?XmlPullParser XmlPullParser xmlPullParser = pullParserFactory.newPullParser(); // ? xml xmlPullParser.setInput(new StringReader(xmlString)); list = new ArrayList<News>(); // int eventType = xmlPullParser.getEventType(); while (true) { if (eventType == XmlPullParser.START_TAG) { String nodeName = xmlPullParser.getName(); if (nodeName.equals("item")) { break; } } eventType = xmlPullParser.next(); } while (eventType != XmlPullParser.END_DOCUMENT) { String nodeName = xmlPullParser.getName(); switch (eventType) { // case XmlPullParser.START_DOCUMENT: break; // case XmlPullParser.START_TAG: // student if ("item".equals(nodeName)) { // student news = new News(); // news.setTitle(xmlPullParser.nextText()); } else if ("title".equals(nodeName)) { news.setTitle(xmlPullParser.nextText()); } else if ("link".equals(nodeName)) { String url = xmlPullParser.nextText(); //Log.e(TAG, "ttt" + url); if (url != null) { //JSOUP try { getImageAndContent(url, news); } catch (Exception e) { e.printStackTrace(); } } //news.setContent(); } break; // ? case XmlPullParser.END_TAG: if ("item".equals(nodeName)) { // list.add(news); news = null; } break; default: break; } eventType = xmlPullParser.next(); } return list; } public void getImageAndContent(String url, News news) throws Exception { Document doc = Jsoup.connect(url).get(); Elements image = doc.select(".entry-content img"); news.setImage(image.attr("src")); Elements content = doc.select(".entry-content"); news.setContent(content.html()); } public List<News> readNewsFromCache() { File file = new File(getActivity().getFileStreamPath(NEWS_CACHE_NAME).getPath()); if (file.exists()) { long t = 24 * 60 * 60 * 1000;//1 if (System.currentTimeMillis() - file.lastModified() >= t) { Log.e(TAG, "" + "\t" + System.currentTimeMillis() + "\t" + file.lastModified()); return null; } try { FileInputStream fin = getActivity().openFileInput(NEWS_CACHE_NAME); ObjectInputStream in = new ObjectInputStream(fin); List<News> list = (List<News>) in.readObject(); in.close(); return list; } catch (Exception e) { e.printStackTrace(); deleteCache(); } } return null; } public void deleteCache() { File file = new File(getActivity().getFileStreamPath(NEWS_CACHE_NAME).getPath()); file.deleteOnExit(); } public void writeNewsToCache(List<News> list) { try { FileOutputStream fot = getActivity().openFileOutput(NEWS_CACHE_NAME, Context.MODE_PRIVATE); ObjectOutputStream out = new ObjectOutputStream(fot); out.writeObject(list); out.close(); } catch (IOException e) { e.printStackTrace(); } } @Override public void onRefresh() { isForce = true; NewsAsyncTask task = new NewsAsyncTask(); task.execute(); } public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> implements View.OnClickListener { private List<News> mLists; public CardAdapter() { mLists = null; } public CardAdapter(List<News> list) { mLists = list; } @Override public void onClick(View v) { //Item Click int pos = (int) v.getTag(); News news = mLists.get(pos); Intent intent = new Intent(); intent.setClass(getActivity(), NewsDetailsActivity.class); intent.putExtra("news", news); intent.putExtra("pos", pos); startActivity(intent); //Log.e(TAG, "POS" + news.getTitle()); } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_cardview, parent, false); return new ViewHolder(v); } @Override public void onBindViewHolder(ViewHolder holder, int position) { //? News news = mLists.get(position); holder.mView.setTag(position); // Log.e(TAG, mLists.get(position).getImage()); // Picasso.with(getActivity()).load(mLists.get(position).getImage()).placeholder(R.drawable.loading).fit() .into(holder.ivPic); //holder.ivPic.setImageResource(); holder.tvTitle.setText(news.getTitle()); holder.ivPic.setTag(news.getImage()); // } @Override public int getItemCount() { return mLists == null ? 0 : mLists.size(); } /** * ViewHolder? */ public class ViewHolder extends RecyclerView.ViewHolder { public View mView; public ImageView ivPic; public TextView tvTitle; public ViewHolder(View v) { super(v); mView = v; mView.setOnClickListener(CardAdapter.this); ivPic = (ImageView) mView.findViewById(R.id.news_imageview); tvTitle = (TextView) mView.findViewById(R.id.news_title_textview); } } } class NewsAsyncTask extends AsyncTask<Void, Void, List<News>> { /** * ?,?,? */ @Override protected void onPreExecute() { super.onPreExecute(); Log.e(TAG, "onPreExecute"); } @Override protected List<News> doInBackground(Void... params) { List<News> list = readNewsFromCache();// =new ArrayList<News>(); //??,? if (list != null && !isForce) { return list; } try { String xmlString = NetWork.getUrlString(NEWS_RSS_URL); list = getNews(xmlString); //?? writeNewsToCache(list); } catch (Exception e) { e.printStackTrace(); sendServerError(); } return list; } /** * ??,? * * @param newses */ @Override protected void onPostExecute(List<News> newses) { super.onPostExecute(newses); if (isForce) { Snackbar.make(mRecyclerView, "?", Snackbar.LENGTH_SHORT).show(); isForce = false; } if (newses != null && newses.size() > 0) { mNoneText.setVisibility(View.INVISIBLE); //Do Something mAdapter = new CardAdapter(newses); mRecyclerView.setAdapter(mAdapter); } mSwipeRefreshWidget.setRefreshing(false); } } }