Android Open Source - Arthashastra Home_ Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package org.aakashlabs.arthashastra;
//  w w w .  j a va2  s  .  c  o m
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.view.View;
import android.view.MenuItem;

/*
 *  Arthashastra - a financial literacy app
    Copyright (C) 2013 Made by Tushar Bhargava (tushar1995@gmail.com)

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *
 */


/**
 * This activity serves a similar function as that of a home page in a browser.
 * It's the first page you seen when you open the app. 
 * It shows the 3 main modules - Beginner, Novice and Advanced.
 * Clicking on any one starts the Activity associated with that button.
 * 
 * Also note that all layouts (the UI) can be found in 'res'->'layout'
 * The nomenclature of the layouts is extremely straightforward and reflects the activity
 * or fragment it is associated with.
 * 
 * The Home activity is also important because the documentation for recurring blocks of code
 * (standard methods) is to be found here. 
 * 
 * @author Tushar Bhargava
 *
 */

public class Home_Activity extends Activity {

  public static final String file_name="score_file";
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_);
    
    
    // Linking buttons to their files
    Button about=(Button)findViewById(R.id.fin_lit_basic_button);
    
    about.setOnClickListener(new View.OnClickListener(){
      
      public void onClick(View v)
      {
        startActivity(new Intent("org.aakashlabs.arthashastra.Beginner_Activity"));
      }// end innermost function
    });// end inner function
    
    Button novice=(Button)findViewById(R.id.medium_user);
    
    novice.setOnClickListener(new View.OnClickListener(){
      
      public void onClick(View v)
      {
        startActivity(new Intent("org.aakashlabs.arthashastra.Novice_Activity"));
      }// end innermost function
    });// end inner function
    
    Button advanced=(Button)findViewById(R.id.advanced_user);
    advanced.setOnClickListener(new View.OnClickListener(){
      
      public void onClick(View v)
      {
        startActivity(new Intent("org.aakashlabs.arthashastra.Advanced_Activity"));
      }// end innermost function
    });// end inner function
    
  }// end onCreate Function
    
  

  /* This code initiates the 'Action Bar'. It inflates it with menu items defined in 
  * home_.xml
  */
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      
     // Inflate the menu; this adds items to the action bar if it is present.
     getMenuInflater().inflate(R.menu.home_, menu);
     
   // Updating score and making sure it's shown in the action bar
     // The score_keeper is a dynamic addition to the menu
     MenuItem score_keeper=menu.add(Integer.toString(get_score()));
     // This ensures that score_keeper is always shown and not hidden in the overflow menu 
     score_keeper.setShowAsAction(2);  
     
     
     
  return true;
  }
  
  // This helps define the actions that are to be performed when menu items of the action
  // bar are clicked
    
  @Override
  public boolean onOptionsItemSelected(MenuItem item)
  {
    // Handle item selection
    
    switch(item.getItemId())
    {
    
    // Clicking the 'About' item in the overflow menu opens the About PDF file
    case R.id.about_the_app:
      view_PDF("AboutV1.pdf");
      return true;
      
    // Clicking the 'Help' item in the overflow menu opens the 'Help' PDF file
    case R.id.help_for_app:
      view_PDF("Help.pdf");
      return true;
      
      // Clicking any other item (such as the 'Score' text etc.) performs the 'default'
      // action which is *nothing*. Clicking these items does not lead to any change 
      // occurring
      default:
        return super.onOptionsItemSelected(item);
      
    }// end switch statement
    
    
  } // end function
  

  /* This function provides PDF viewing functionality for the app. You pass the file name
  * with the '.pdf' postscript and it opens the file provided it is in the correct folder.
    * This function essentially calls an 'Intent' that opens the PDF file in a PDF Viewer
  * application. The PDF viewer application must be installed in the device. 
  */
  
   public void view_PDF(String file_name)
    {
      // I'm assuming all my files will be stored on the SD card directly ; using bluetooth
      // for tablet testing

      File file = new File(Environment.getExternalStorageDirectory()+"/bluetooth/"+file_name);
      
      if(file.exists())
      {
      // Now I am going to use an intent to let the default application handle PDF viewing
      Uri path=Uri.fromFile(file);
      Intent pdf_view = new Intent(android.content.Intent.ACTION_VIEW);
        pdf_view.setDataAndType(path,"application/pdf");
        pdf_view.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        
        
        try
        {
          startActivity(pdf_view);
        }// end try statement
      
      catch(ActivityNotFoundException e)
      {
        Toast no_app=Toast.makeText(getBaseContext(), "Application to view PDF missing", Toast.LENGTH_SHORT);
        no_app.show();
      }// end catch statement
      }// end if statement
      
      else
      {
        System.out.println("File does not exist !");
        Toast no_file=Toast.makeText(getBaseContext(), "File does not exist !", Toast.LENGTH_SHORT);
        no_file.show();
      }// end else statement

      
    }// end function 
   
   /*
    *  This function returns the current score of the user. The score is stored in a file
    *   in the Internal Storage of the app.
    */
   
    
    public int get_score()
    {
      int score=0;
      
      // Creates a file with the name of the string stored in 'file_name' in the 
      // internal directory of the app
      File file=new File(getFilesDir(), file_name);
      
      // If the file does not exist then we assume the user has just opened the app and
      // the score is zero
      if(!file.exists())
      {
        return score;
      }// end if statement
        
         try
         {
        FileInputStream fis = openFileInput(file_name);
        InputStreamReader in=new InputStreamReader(fis);
        BufferedReader br=new BufferedReader(in);
        score=Integer.parseInt(br.readLine());
         }// end try statement
         
         catch (Exception e)
         {
        e.printStackTrace();
         }// end catch statement
      
         return score;
         
    }// end function


}// end class

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