Android Open Source - PlayTunes Check Remote Version File Task

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License

The source code is released under:
Copyright (c) 2014, Impeccable Labs, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions ar...
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Java Source Code

package com.ideabag.playtunes.util;
/*w w w  .  j  a v a  2s . co m*/
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
import java.util.Scanner;

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

import com.ideabag.playtunes.R;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Handler;
import android.view.View;

public class CheckRemoteVersionFileTask extends AsyncTask< String, Void, JSONObject> {
  
  private static final String VERSION_FILE_URL = "http://version.playtunesapp.com";
  private static final String UPDATE_PREF_FILE = "update_pref_file";
  private static final String UPDATE_PREF_KEY = "update_timestamp";
  
  private static final int ONE_WEEK_MILLI = 604800000;
  
  Context mContext;
  SharedPreferences prefs;
  
  int mVersionCode = 0;
  
  public CheckRemoteVersionFileTask( Context context) {
    
    mContext = context;
    prefs = mContext.getSharedPreferences( UPDATE_PREF_FILE, Context.MODE_PRIVATE );
    
    try {
      mVersionCode = mContext.getPackageManager().getPackageInfo( mContext.getPackageName(), 0).versionCode;
    } catch (NameNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    
  }
  
/*
  This is what the JSON file looks like:
  
  {
    
    versionInfo: {
      
      code: 9,
      name: "4.0",
      
    },
    
    changelog: "",
    
  }
*/
  
  private static final String VERSION_INFO = "versionInfo";
  private static final String VERSION_CODE = "versionCode";
  private static final String VERSION_NAME = "versionName";
  private static final String CHANGE_LOG = "changelog";
  

  
    /** The system calls this to perform work in a worker thread and
      * delivers it the parameters given to AsyncTask.execute() */
    protected JSONObject doInBackground( String... urls ) {
      
      JSONObject job = null;
      String result = "";
      
      long then = prefs.getLong( UPDATE_PREF_KEY, 0 );
      long mNow = new Date().getTime();
      
      
      if ( mNow - ONE_WEEK_MILLI < then ) {
        
        cancel( true );
        
      } else {
        
        try {
          //HttpURLConnection.setFollowRedirects( true );
          URL url = new URL( VERSION_FILE_URL );
          HttpURLConnection mUrlConnection = ( HttpURLConnection ) url.openConnection();
          mUrlConnection.setUseCaches( false );
          //mUrlConnection.setInstanceFollowRedirects( true );
          
          while ( true ) {
            switch ( mUrlConnection.getResponseCode() ) {
              
                  case HttpURLConnection.HTTP_MOVED_PERM:
                  case HttpURLConnection.HTTP_MOVED_TEMP:
                    
                    url = new URL( mUrlConnection.getHeaderField( "Location" ) );
                    mUrlConnection.disconnect();
                    mUrlConnection = ( HttpURLConnection ) url.openConnection();
                     continue;
                     
               }
            
            break;
            
          }
          
          long lastModified = mUrlConnection.getLastModified();
          
          if ( mNow > lastModified ) {
            
            //mUrlConnection.connect();
            
          InputStream in = new BufferedInputStream( mUrlConnection.getInputStream() );
              
          @SuppressWarnings("resource")
          Scanner s = new Scanner( in ).useDelimiter("\\A");
            
          while ( s.hasNext() ) {
            
            result = result.concat( s.next() );
            
          }
          
          s.close();
          
          //mUrlConnection.disconnect();
          
          job = new JSONObject( result );
          
          int remoteVersionCode = job.getInt( VERSION_CODE );
          
          SharedPreferences.Editor edit = prefs.edit();
          
          if ( mVersionCode < remoteVersionCode ) {
            
            edit.putLong( UPDATE_PREF_KEY, 0 );
            
          } else {
            
            edit.putLong( UPDATE_PREF_KEY, mNow );
            
          }
          
          edit.commit();
          
          }
        
      } catch ( IOException e ) {
          
        e.printStackTrace();
          
      } catch ( JSONException e ) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        android.util.Log.i( "CheckRemoveVersionFile", "" + result );
      }
        
      }
      
        return job;
    }
    
    /** The system calls this to perform work in the UI thread and delivers
      * the result from doInBackground() */
    protected void onPostExecute( JSONObject result ) {
        
      if ( !isCancelled() ) {
      
        if ( null != result ) {
          
          try {
            
            int remoteVersionCode = result.getInt( VERSION_CODE );
            String changelog = result.getString( CHANGE_LOG );
            
            int versionCode = mContext.getPackageManager()
                  .getPackageInfo( mContext.getPackageName(), 0).versionCode;
            
            if ( versionCode < remoteVersionCode ) {
              
              //handle.post( notUpToDate );
              
              new AlertDialog.Builder( mContext )
                          .setTitle( mContext.getString( R.string.update_app ) )
                          .setMessage( mContext.getString( R.string.version_outdated ) + ( changelog != null && changelog.length() > 1 ? "\n\n" + changelog : "" ) )
                          .setNegativeButton( mContext.getString( R.string.cancel ), mClickListener)
                          .setPositiveButton( mContext.getString( R.string.update ), mClickListener)
                          .show();
              
              
            }
            
            
          } catch( Exception e ) {
            
            
            
          }
          
        }
        
      }
      
    }
    
    DialogInterface.OnClickListener mClickListener = new DialogInterface.OnClickListener() {
    
    @Override public void onClick( DialogInterface arg0, int arg1 ) {
      
      if ( arg1 == DialogInterface.BUTTON_POSITIVE ) {
        
        final String appPackageName = mContext.getPackageName(); // getPackageName() from Context or Activity object
        
        try {
          
            mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + appPackageName)));
        
        } catch (android.content.ActivityNotFoundException anfe) {
          
          mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://play.google.com/store/apps/details?id=" + appPackageName)));
          
        }
        
      }
      
    }
    
  };
  
}
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