Android Open Source - Itune Http Fetch Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.ripoff.itune;
//from  ww w  .  ja v  a  2s  .  c  o m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public class HttpFetchActivity extends ActionBarActivity {
  
  public final static String EXTRA_URL = "com.ripoff.itune.URL";
  public static final String URL_ITUNE = "http://itunes.apple.com/search?";
  public final static String GET_LIMIT = "&limit=";
  public final static String GET_TERM="term=";
  public final static String TAG_ANAME="artistName";
  public final static String TAG_TNAME="trackName";
  public final static String TAG_URL30="artworkUrl30";
  private final static int K = 2;
  
  public JSONArray results = null;
  public ListView listView;
  public ArrayList<String> arrlist = new ArrayList<String>();
  public ArrayList<Bitmap> bitmapCache = new ArrayList<Bitmap>();
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    
    super.onCreate(savedInstanceState);
    
    setContentView(R.layout.activity_http_fetch);
        
    //Permit execution on the main thread 
    StrictMode.ThreadPolicy policy = new StrictMode.
    ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    
    //Receive the intent
    Intent intent = getIntent();
    
    //intent key values
    final String iRequest = intent.getStringExtra(MainActivity.KEY_URL).replaceAll("\\s","");  /*Remove all white spaces as precaution*/
    final String iLimit = intent.getStringExtra(MainActivity.KEY_LIMIT);
    
    //Establish connection to URL
    try {
        URL url = new URL(iRequest);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        readStream(con.getInputStream());
    }  catch (Exception e) {
        e.printStackTrace();
      }
    
    /*-----------Custom Adapter for ListView------------------*/
    CustomAdapter newAdapter = new CustomAdapter();
    ListView listView= (ListView)findViewById(R.id.list1);
    listView.setAdapter(newAdapter);
    
    /*-----Action to perform when user clicks on a specific entity of the list------*/
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
                 
                // get artist name of selected list item
                String artistName = getArtistName(position);
                
                //Construct the URL for searching for the artist name alone
                //Note that the limit is obtained from the previous intent
                String url = URL_ITUNE + GET_TERM + artistName + GET_LIMIT + iLimit;
                
                // Launching itself (same activity) as the new intent to search for artist
                Intent i = new Intent(getApplicationContext(), HttpFetchActivity.class);
                i.putExtra(MainActivity.KEY_URL, url);
                i.putExtra(MainActivity.KEY_LIMIT,iLimit);
                startActivity(i);
               
            }
          });
    
  }
  
  //Function to get an artist name from 'arrlist' 
  private String getArtistName(int position)
    {
    List<String> recordList = arrlist;
    return recordList.get(position*K);
    }
  
  /* Read the text stream (JSON Object) obtained through URL call */
  private void readStream(InputStream in) {
    BufferedReader reader = null;
    try {
        reader = new BufferedReader(new InputStreamReader(in));
        
        //String builder to grow the sting(s) read
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("");
        
        //String to hold buffer state
        String line="";
        
        //Read line by line
        while ((line = reader.readLine()) != null) {
          stringBuilder.append(line);
        }
        
        //Final entire string
        String finalstring = stringBuilder.toString();
        
        //Parse the JSON string and update 'arrlist' with the list of artists,tracks and bitmaps
        parseJson(finalstring);
    } 
    catch (IOException e) {
      e.printStackTrace();
    }  finally {
             if (reader != null) {
             try {
                 reader.close();
             }  catch (IOException e) {
                 e.printStackTrace();
               }
             }
      }
    
  }
  /* Decode the JSON object and obtain specific tag values*/
  private void parseJson(String Jstr)
  {
    if(Jstr != null){
      try{
        
        //Obtain the JSON array under the results tag.
        JSONObject Jobj = new JSONObject(Jstr);
        results = Jobj.getJSONArray("results"); 
        
        for(int i=0; i<results.length(); i++){
          
          //i'th object element of the JSON array
          JSONObject Jtemp = results.getJSONObject(i);
          
          //Obtain Value of specific tags
          String Art_name = Jtemp.getString(TAG_ANAME);
          String Track_name = Jtemp.getString(TAG_TNAME);
          String url30 = Jtemp.getString(TAG_URL30);
          
          //Add the values to 'arrlist'
          arrlist.add(Art_name);
          arrlist.add(Track_name);
          
          //Download the bitmaps and store it in a cache 
          bitmapCache.add(download_Image(url30));
          
        }
                
            Log.w("Itune-query","JSON parse Complete!"); 
      
      }catch(JSONException e){
        e.printStackTrace();
      }
    }
  }  
  
  // Custom ListView adapter 
  public class CustomAdapter extends BaseAdapter{
    List<String> recordList = arrlist;
    
    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      
      /*Treat the list as a list as list of records with K items per entity*/
      return recordList.size()/K;
    }

    @Override
    public String getItem(int arg0) {
      // TODO Auto-generated method stub
      return recordList.get(arg0);
    }

    @Override
    public long getItemId(int arg0) {
      // TODO Auto-generated method stub
      return arg0;
    }

    @Override
    public View getView(int arg0, View arg1, ViewGroup arg2) {
      // TODO Auto-generated method stub
      if(arg1 == null){
        LayoutInflater inflater = LayoutInflater.from(arg2.getContext());
        arg1 = inflater.inflate(R.layout.listitem ,arg2,false);
      }
      //View slots for Artist, track and icon
      TextView artistName = (TextView)arg1.findViewById(R.id.textView1);
      TextView trackName = (TextView)arg1.findViewById(R.id.textView2);
      ImageView icon = (ImageView)arg1.findViewById(R.id.imageView1);
      
      //Retrieve the info to display on one list entity
      String temp_artistName = recordList.get(arg0*K);
      String temp_trackName = recordList.get(arg0*K+1);
      
      //Display the artist name and track name
      artistName.setText(temp_artistName);
      trackName.setText(temp_trackName);
      
      //Obtain the Bitmap icons from cache and display it
      icon.setImageBitmap(bitmapCache.get(arg0));
      
      return arg1;
    }
    
  }
  private Bitmap download_Image(String url) {

    /* Function to download a bitmap from a given URL - SHAMELESSLY COPIED*/
    
        Bitmap bmp =null;
        try{
            URL ulrn = new URL(url);
            HttpURLConnection con = (HttpURLConnection)ulrn.openConnection();
            InputStream is = con.getInputStream();
            bmp = BitmapFactory.decodeStream(is);
            if (null != bmp)
                return bmp;

            }catch(Exception e){}
        return bmp;
    }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.http_fetch, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
      View rootView = inflater.inflate(R.layout.fragment_http_fetch,
          container, false);
      return rootView;
    }
  }

}

Java Source Code List

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