Android Open Source - digitalcampus Login Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.llenguatges.digitalcampus.login;
/* w  w  w  .  j a v  a 2 s  .c  o m*/
import com.llenguatges.digitalcampus.MainActivity;
import com.llenguatges.digitalcampus.R;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;

public class LoginActivity extends Activity {
  
  // Session Manager Class
    SessionManager session;
    
    // Local variables
    private static String USER_EMAIL = "email";
  private static final String[] DUMMY_CREDENTIALS = new String[] { "foo@example.com:hello", "bar@example.com:world", "administrador@salleurl.edu:123qwe", "a@a.com:asdfgh" };
  public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL";
  private UserLoginTask mAuthTask = null; //Keep track of the login task to ensure we can cancel it if requested.
  private String mEmail;
  private String mPassword;
  private EditText mEmailView;
  private EditText mPasswordView;
  private View mLoginFormView;
  private View mLoginStatusView;
  private TextView mLoginStatusMessageView;
  
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    session = new SessionManager(getApplicationContext());
    // Set up the login form.
    mEmail = getIntent().getStringExtra(EXTRA_EMAIL);
    mEmailView = (EditText) findViewById(R.id.email);
    mEmailView.setText(mEmail);
    mPasswordView = (EditText) findViewById(R.id.password);
    mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
      public boolean onEditorAction(TextView textView, int id,
          KeyEvent keyEvent) {
        if (id == R.id.login || id == EditorInfo.IME_NULL) {
          attemptLogin();
          return true;
        }
        return false;
      }
    });

    mLoginFormView = findViewById(R.id.login_form);
    mLoginStatusView = findViewById(R.id.login_status);
    mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

    findViewById(R.id.sign_in_button).setOnClickListener(new View.OnClickListener() {
      public void onClick(View view) {
        attemptLogin();
      }
    });
  }

  /**
   * Attempts to sign in or register the account specified by the login form.
   * If there are form errors (invalid email, missing fields, etc.), the
   * errors are presented and no actual login attempt is made.
   */
  public void attemptLogin() {
    if (mAuthTask != null) {
      return;
    }
    mEmailView.setError(null);
    mPasswordView.setError(null);
    mEmail = mEmailView.getText().toString();
    mPassword = mPasswordView.getText().toString();
    boolean cancel = false;
    View focusView = null;
    // Check for a valid password.
    if (TextUtils.isEmpty(mPassword)) {
      mPasswordView.setError(getString(R.string.error_field_required));
      focusView = mPasswordView;
      cancel = true;
    } else if (mPassword.length() < 6) {
      mPasswordView.setError(getString(R.string.error_invalid_password));
      focusView = mPasswordView;
      cancel = true;
    }
    String[] pieces = mEmail.split("@");
    // Check for a valid email address.
    if (TextUtils.isEmpty(mEmail)) {
      mEmailView.setError(getString(R.string.error_field_required));
      focusView = mEmailView;
      cancel = true;
    } else if (!mEmail.contains("@")) {
      mEmailView.setError(getString(R.string.error_invalid_email));
      focusView = mEmailView;
      cancel = true;
    } else if(!pieces[1].contains(".")){
      mEmailView.setError(getString(R.string.error_invalid_email));
      focusView = mEmailView;
      cancel = true;
    }

    if (cancel) {
      // There was an error; don't attempt login and focus the first form field with an error.
      focusView.requestFocus();
    } else {
      // Show a progress spinner, and kick off a background task to perform the user login attempt.
      mLoginStatusMessageView.setText(R.string.login_progress_signing_in);
      showProgress(true);
      mAuthTask = new UserLoginTask();
      mAuthTask.execute((Void) null);
    }
  }
  
  
  /**
   * Shows the progress UI and hides the login form.
   */
  @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
  private void showProgress(final boolean show) {
    // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
    // for very easy animations. If available, use these APIs to fade-in
    // the progress spinner.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
      int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
      mLoginStatusView.setVisibility(View.VISIBLE);
      mLoginStatusView.animate().setDuration(shortAnimTime).alpha(show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
        public void onAnimationEnd(Animator animation) { 
          mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
        }
      });
      mLoginFormView.setVisibility(View.VISIBLE);
      mLoginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
        public void onAnimationEnd(Animator animation) {
          mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
      });
    } else {
      // The ViewPropertyAnimator APIs are not available, so simply show
      // and hide the relevant UI components.
      mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
      mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
    }
  }

  /**
   * Represents an asynchronous login/registration task used to authenticate
   * the user.
   */
  public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
    protected Boolean doInBackground(Void... params) {
      try {
        // Simulate network access.
        Thread.sleep(2000);
      } catch (InterruptedException e) {
        return false;
      }

      for (String credential : DUMMY_CREDENTIALS) {
        String[] pieces = credential.split(":");
        if (pieces[0].equals(mEmail)) {
          // Account exists, return true if the password matches.
          if(pieces[1].equals(mPassword)){
            CheckBox cb = (CheckBox)findViewById(R.id.check);
            if(cb.isChecked()){
              session.createLoginSession(pieces[0].toString());
            }
            return true;
          }
          return false;
        }
      }
      return false;
    }
    // Open application main activity after setting up the login session
    protected void onPostExecute(final Boolean success) {
      mAuthTask = null;
      showProgress(false);
      if (success) {
        Intent mainIntent = new Intent().setClass(LoginActivity.this, MainActivity.class);
        mainIntent.putExtra(USER_EMAIL, mEmail);
        startActivity(mainIntent);
        finish();
      } else {
        mPasswordView.setError(getString(R.string.error_incorrect_password));
        mPasswordView.requestFocus();
      }
    }
    protected void onCancelled() {
      mAuthTask = null;
      showProgress(false);
    }
  }
}

Java Source Code List

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