Android Open Source - AndroidAdvancedDemos Async Task Fragment

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License

The source code is released under:
MIT License
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Java Source Code

package com.krieger.training.androidadvanceddemos.fragment;
//from   ww w.  ja  v  a 2  s. c  o  m
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.essentailab.training.androidadvanceddemos.R;
import com.krieger.training.androidadvanceddemos.adapter.UniversalListAdapter;
import com.krieger.training.androidadvanceddemos.entities.ListElementCookie;
import com.krieger.training.androidadvanceddemos.interfaces.AsyncListInflationAction;

public class AsyncTaskFragment extends Fragment{
  private ListView lv;
  private ProgressBar pb;
  private TextView pb_txt;
  private View pb_container;
  private LayoutInflater inflater;
  private ThumbAsyncTask task;
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    this.inflater=inflater;
    View v = inflater.inflate(R.layout.fragment_asynctask, container, false);
    lv = (ListView) v.findViewById(R.id.frag_asynctask_lv);
    pb = (ProgressBar) v.findViewById(R.id.frag_asynctask_pb);
    pb_txt = (TextView) v.findViewById(R.id.frag_asynctask_txt);
    pb_container = v.findViewById(R.id.frag_asynctask_container_pb);
    
    
    String[] img_urls = {
      "http://images.krieger-electronics.com/sample1.png",
      "http://images.krieger-electronics.com/sample2.png",
      "http://images.krieger-electronics.com/sample3.png",
      "http://images.krieger-electronics.com/sample4.png",
      "http://images.krieger-electronics.com/sample5.png",
    };
    
    String[] urls = new String[20];
    for(int i=0; i<urls.length;i++)
      urls[i]=img_urls[i%(img_urls.length)];
    
    task = new ThumbAsyncTask(getActivity());
    task.execute(urls);
    
    return v;
  }
  
  @Override
  public void onStop() {
    task.cancel(true);
    super.onStop();
  }

  private void setProgress(int progress, int total){
    float pgrss = ((float)progress)/((float)total);
    float t_pgrss = pgrss*((float)pb.getMax());
    pb.setProgress((int)t_pgrss);
    pb_txt.setText("Downloaded: "+Integer.toString(progress)
        +" of "+Integer.toString(total));
  }
  
  private void inflateList(final ArrayList<Object> data){
    pb_container.setVisibility(View.GONE);
    lv.setVisibility(View.VISIBLE);

    lv.setAdapter(new UniversalListAdapter(inflater,
        R.layout.row_listview,
        data,
        new AsyncListInflationAction()));
    
    OnItemClickListener clickHandler = new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            Toast.makeText(v.getContext(), "You pressed: "
                +((ListElementCookie)data.get(position))
                .getTitle(), Toast.LENGTH_LONG).show();
        }
    };
    lv.setOnItemClickListener(clickHandler);
  }
  
  private class ThumbAsyncTask extends AsyncTask<String, Integer,
      ArrayList<Object>>{

    private int count;
    private Context c;
    
    public ThumbAsyncTask(Context c){
      this.c=c;
    }
    
    @Override
    protected ArrayList<Object> doInBackground(String... urls) {
      count = urls.length;
      
      ArrayList<Object> data = new ArrayList<Object>();
      publishProgress(0);
      
      for (int i = 0; i < count; i++) {
        if (isCancelled()) break;
        ListElementCookie cookie = new ListElementCookie(i,
            downloadImage(urls[i]),
            "Item "+Integer.toString(i),
            "Lorem ipsum dolor sit amet, consectetur "
            +"adipisicing elit, sed do eiusmod tempor "
            +"incididunt ut labore et dolore magna aliqua.");
        
        data.add(cookie);
        publishProgress(i+1);
      }
      return data;
    }
    
    protected void onProgressUpdate(Integer... progress) {
      setProgress(progress[0], count);
    }

      protected void onPostExecute(ArrayList<Object> result) {
        inflateList(result);
      }
      
      @Override
    protected void onCancelled() {
      Toast.makeText(c, "Download was interrupted!", Toast.LENGTH_LONG).show();
      super.onCancelled();
    }

    private Drawable downloadImage(String url){
      try {
        InputStream is = (InputStream) new URL(url).getContent();
        return Drawable.createFromStream(is, "img");
      } catch (Exception e) {
        e.printStackTrace();
        return null;
      }
    }
  }
}
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