Android Open Source - AndroidPINProtectionExample Utilities

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.pinexample.utilities;
//from w w w.  ja v a2  s . c om
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;

import com.example.pinexample.R;


/**
 * A model class that resolves some of the business logic in the application.
 * Also as a part of the MVC(Model View Controller) pattern. It
 * presents changes to the UI thread through the Controller classes.
 * 
 * @author drakuwa
 */
public class Utilities {
  
  private Context ctx;
  
  /**
   * Constructor of the Model class which initializes the activity context.
   * 
   * @param context
   */
  public Utilities(Context context) {
    ctx = context;
  }
  
  /**
   * Method that creates and shows an AlertDialog with a message passed with
   * the txt parameter, and a PositiveButton "OK"
   * 
   * @param txt
   */
  public void customDialog(final String txt) {
    AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
    builder.setMessage(txt)
        .setIcon(R.drawable.ic_launcher)
        .setTitle(R.string.app_name)
        .setCancelable(false)
        .setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int id) {
              }
            });
    AlertDialog alert = builder.create();
    try {
      alert.show();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  
  /**
   * Encrypt the given toHash string to SHA1 and return the result
   * @param toHash
   * @return
   */
  public static String sha1Hash(String toHash){
    String hash = null;
    try {
      MessageDigest digest = MessageDigest.getInstance("SHA-1");
      byte[] bytes = toHash.getBytes("UTF-8");
      digest.update(bytes, 0, bytes.length);
      bytes = digest.digest();
      StringBuilder sb = new StringBuilder();
      for(byte b : bytes){
        sb.append(String.format("%02X", b));
      }
      hash = sb.toString();
    } catch (NoSuchAlgorithmException e) {
      Log.e(Log.TAG, e.getLocalizedMessage());
    } catch (UnsupportedEncodingException e) {
      Log.e(Log.TAG, e.getLocalizedMessage());
    }
    return hash;
  }

}

Java Source Code List

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