Android Open Source - scanvine-android Source List Fragment

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License

The source code is released under:
Copyright (c) 2013 Jonathan Evans (http://www.rezendi.com) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Softw...
If you think the Android project scanvine-android listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.scanvine.android.ui;
//ww w  .  j a  v  a 2s .  com
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.scanvine.android.R;
import com.scanvine.android.model.Source;
import com.scanvine.android.util.Util;

public class SourceListFragment extends ListFragment {
  private Callbacks mCallbacks = sDummyCallbacks;
  private ArrayList<Source> sources = null;

  public interface Callbacks {
    public void onItemSelected(String json);
      public void showProgress(Boolean progress);
  }

  // A dummy implementation for use when not attached to an activity.
  private static Callbacks sDummyCallbacks = new Callbacks() {
    @Override
    public void onItemSelected(String json) {}
      public void showProgress(Boolean progress) {}
  };

  // Mandatory empty constructor for the fragment manager to instantiate the fragment.
  public SourceListFragment() { }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    if (!(activity instanceof Callbacks))
      throw new IllegalStateException("Activity must implement fragment's callbacks.");
    mCallbacks = (Callbacks) activity;
  }

  @Override
  public void onDetach() {
    super.onDetach();
    mCallbacks = sDummyCallbacks;
  }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ListView lv = (ListView) inflater.inflate(R.layout.fragment_story_list, container, false);
    lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    return lv;
    }
    
    @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    new SourcesFetchTask().execute();
  }
  
  @Override
  public void onListItemClick(ListView listView, View view, int position,
      long id) {
    super.onListItemClick(listView, view, position, id);
    mCallbacks.onItemSelected(sources.get(position).getJSON());
  }

  private void renderSources() {
    final Context ctx = getActivity().getApplicationContext();
      ArrayAdapter<Source> adapter = new ArrayAdapter<Source>(ctx, R.layout.source_line, sources) {
          @Override
          public View getView(int position, View convertView, ViewGroup parent){
            View view = convertView;
              if(view == null){
                  LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                  view = inflater.inflate(R.layout.source_line, null);                    
              }

              Source source = sources.get(position);
              TextView txt = (TextView) view.findViewById(R.id.source_name);
              txt.setText(source.getName());
              txt = (TextView) view.findViewById(R.id.source_score);
              txt.setText(""+source.getScore());
   
              return view;
          }
      };
      setListAdapter(adapter);
  }

  public void refreshList(String section) {
    new SourcesFetchTask().execute(section);
  }

  public void sortList(final boolean byName) {
    Collections.sort(sources, new Comparator<Source>() {
        public int compare(Source a, Source b) {
          if (byName)
            return a.getName().compareTo(b.getName());
          Integer v1 = Integer.valueOf(0-a.getScore());
          Integer v2 = Integer.valueOf(0-b.getScore());
          return v1.compareTo(v2);
        }
    });
    renderSources();
  }

  public final class SourcesFetchTask extends AsyncTask<String, Boolean, String> {
    @Override
    protected String doInBackground(String... params) {
          Log.i(""+this, "Fetching sources, online: "+Util.AreWeOnline(getActivity()));
        publishProgress(true);
        String result = null;
        String url = "http://www.scanvine.com/api/1/sources";
        String section = params.length==0 ? null : params[0];
        if (section!=null && section.trim().length()>0)
          url+="/"+section;
            String fileName = Util.ConvertUrlToFilename(url);
            File sourcesFile = new File(getActivity().getCacheDir(), fileName);

            if (sourcesFile.exists()) {
              boolean useCache = !Util.AreWeOnline(getActivity());
              long age = System.currentTimeMillis() - sourcesFile.lastModified();
              useCache = useCache || (age >0 && age < 4*60*60*1000);
                if (useCache) {
                  Log.i(""+this, "Using cached sources file");
                  result = Util.ConvertFileToString(sourcesFile);
                  return result;
                }
            }

        HttpClient httpclient = new DefaultHttpClient();
          Log.i(""+this, "About to fetch "+url);
        try {
          HttpGet httpget = new HttpGet(url); 
          HttpResponse response = httpclient.execute(httpget);
            Log.i(""+this, "Fetch result: "+response);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream instream = entity.getContent();
                result = Util.ConvertStreamToString(instream);
                instream.close();
            }
        }
          catch (org.apache.http.NoHttpResponseException ex) {
                if (sourcesFile.exists())
                  result = Util.ConvertFileToString(sourcesFile);
                return result;
        } catch (Exception ex) {
          Log.e(""+this, "Fetch error: "+ex);
          ex.printStackTrace();
        }
        
        if (result!=null && result.length()>0) {
          //write to cache
            try {
                FileWriter out = new FileWriter(sourcesFile);
                out.write(result);
                out.close();
                Log.i(""+this, "Cached results to "+sourcesFile);
            } catch (IOException ex) {
                Log.e(""+this, "Write error: "+ex);
                ex.printStackTrace();
            }
        }
        return result;
    }
    
      @Override
    protected void onProgressUpdate(Boolean... progress) {
        mCallbacks.showProgress(progress[0]);
    }

    @Override
    protected void onPostExecute(String result) {
        publishProgress(false);
        if (result!=null && result.length()>0) {
          Log.i(""+this, "Got response of length "+result.length());
          sources = Source.GetSourcesFrom(result);
        }
        else
          sources = new ArrayList<Source>();
        renderSources();
    }
  }

}
Java Source Code List
