Android Open Source - coursera-android-pos Login Activity

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License

The source code is released under:

MIT License

Java Source Code

package edu.vuum.mocca.ui;
/*from   w ww .  j  av a2  s  . c  o  m*/
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;

import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import edu.vuum.mocca.R;
import edu.vuum.mocca.storage.StorageUtilities;

/**
 * The activity that allows the user to provide login information.
 */
public class LoginActivity extends StoryActivityBase{

  // A tag used for debugging with Logcat
  static final String LOG_TAG = LoginActivity.class.getCanonicalName();
  
  // The edit texts used
  EditText mLoginId;
  EditText mPassword;
  
  // Make sure we use maximum security to store login credentials
  // Change to use Private enum.
  static final int MAX_SECURITY = StorageUtilities.SECURITY_PRIVATE;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    // Setup the UI
    setContentView(R.layout.login_activity);  // Line 36
    
    //Find the edit texts
    mLoginId = (EditText) findViewById(R.id.username);
    mPassword = (EditText) findViewById(R.id.password);
    
  }

  /**
   * Get the file used for storing login credentials
   */
  private static File getLoginFile (Context context) {
    return StorageUtilities.getOutputMediaFile(context,   // Line 48
        StorageUtilities.MEDIA_TYPE_TEXT, 
        MAX_SECURITY, 
        "login.txt");
  }
  
  /**
   * Returns the last LoginId input into this activity, or 0 if none is set.
   */
  public static long getLoginId(Context context) {
    // Get the output file for the login information
    File loginFile = getLoginFile(context);    // Line 59
    
    String out = null;
    
    // If it already exists, read the login ID and return it
    if (loginFile != null && loginFile.exists()) {
      try {
        Scanner sc = new Scanner(loginFile);
        out = sc.nextLine();
        sc.close();
        return Long.parseLong(out);
      } catch (Exception e) {
        // This should never really happen
        Log.e(LOG_TAG, "Unable to get LoginID from file");  // Line 72
      }
    }

    return 0;
  }

  /**
   * Returns the last password input into this activity, or null if one has not been set
   */
  public static String getPassword(Context context) {
    // Get the output file for the login information
    File loginFile = getLoginFile(context);
    
    String out = null;
    
    // If it already exists, read the login information from the file and display it
    if (loginFile != null && loginFile.exists()) {
      try {
        Scanner sc = new Scanner(loginFile);  // Line 91
        sc.nextLine();
        out = sc.nextLine();
        sc.close();
        return out;
      } catch (Exception e) {
        // This should never really happen
        Log.e(LOG_TAG, "Unable to get password from file.");
      }
    }

    return out;
  }

  
  /**
   * The login button was clicked.
   */
  public void loginClicked(View v){
    // Save the input login information in a file so that the rest of the app can access it.
    File loginFile = getLoginFile(this);
    try {
      BufferedWriter writer = new BufferedWriter(new FileWriter(loginFile));  // Line 113
      writer.write(mLoginId.getText().toString());
      writer.newLine();
      writer.write(mPassword.getText().toString());
      writer.newLine();
      writer.close();
    } catch (Exception e) {
      Log.e(LOG_TAG, "Problem in loginClicked");
    }
    finally {
      openListStoryActivity();  // Line 123
    }
  }
}

Java Source Code List

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