Android Open Source - clinicalguide Login Activity

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License

The source code is released under:
Apache License
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Java Source Code

package org.get.oxicam.clinicalguide;
// ww  w  .  j  a  va2s  .  co m
import org.get.oxicam.clinicalguide.db.Database;
import org.get.oxicam.clinicalguide.db.Validator;
import org.get.oxicam.clinicalguide.xml.data.User;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.EditText;
import android.widget.Toast;

/**
 * The WelcomeActivity is shown on app startup. It displays the message required
 * for the clinical tests.
 * 
 * @author fth
 * @version 2014-03-11
 */
public class LoginActivity extends Activity implements View.OnClickListener {
  
  // error messages to display on login screen.
  private static final String userNameError = "Username cannot be blank.";
  private static final String userPWError = "Password cannot be blank.";
  private static final String authFailError = "Username and password do not match.";
  
  private Database database;
  private static User user;
  // global toast variable to prevent flooding of toast messages
  private Toast toast;
  public static Activity mActivity;
  
  /**
   * Called when the activity is first created.
   */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    database = new Database(this);

    // set up layout
    setContentView(R.layout.login);
    // register OnClickListener for the skip button
    findViewById(R.id.btn_login).setOnClickListener(this);
    // display keyboard:
    this.getWindow().setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
    
    // initialize the toast message
    // it's initialized here to be able to clear previous toast messsages
    toast = Toast.makeText(this, "", Toast.LENGTH_SHORT);
    mActivity=(this);
  }
  
  /**
   * Add the text change listeners to the user name and password text areas
   * in the login screen.
   */
  private void initializeLoginTextChangeListener() {
    final EditText txtUser = (EditText) findViewById(R.id.txt_username);
    final EditText pwdLogin = (EditText) findViewById(R.id.pwd_login);
    
    // for username area in login screen
    txtUser.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
              String username = txtUser.getText().toString();
              String pw = pwdLogin.getText().toString();
              
              try {
                if(txtUser.getText().toString().equals("")) {
                    txtUser.setError(userNameError);
              } else if(database.authenticateUser(username, pw)) {
                  // exception is thrown
              } else {
                txtUser.setError(null);
              }  
              } catch (Exception e) {
                txtUser.setError(e.getMessage());
              }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void afterTextChanged(Editable s) {}
        });
        
    // for password area in login screen
    /*pwdLogin.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
              String username = txtUser.getText().toString();
              String pw = pwdLogin.getText().toString();
              Boolean authResult = false;
              
              try {
                authResult = database.authenticateUser(username, pw);
              } catch (Exception e) { return ; }
              
            if(pwdLogin.getText().toString().equals("")) {
                pwdLogin.setError(userPWError);
          } else if(!authResult) {
            pwdLogin.setError(authFailError);
              } else {
              pwdLogin.setError(null);
            }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void afterTextChanged(Editable s) {}
        });*/
  }
  
  @Override
  public void onClick(View v) {
    // clear previous toast messages
    // Note that toast.cancel() does no work because it 
    // prevents future toast messages from showing as well
    toast.setDuration(0);
    toast.setDuration(Toast.LENGTH_SHORT);
    
    if (v == findViewById(R.id.btn_login)) {
      EditText txtUser = (EditText) findViewById(R.id.txt_username);
      EditText txtPwd = (EditText) findViewById(R.id.pwd_login);
      
      String username = txtUser.getText().toString();
      String password = txtPwd.getText().toString();
      
      try {
        // if username field is empty
        if(txtUser.getText().toString().equals("")) {
          toast.setText(userNameError);
          toast.show();
        } else if(database.authenticateUser(username, password)) {
          int id = database.getUserId(username);
          user = new User(username, id);
          Intent intent = new Intent(v.getContext(),
              ClinicalGuideActivity.class);
          startActivity(intent);
        // if password field is empty
        } else if(txtPwd.getText().toString().equals("")) {
          toast.setText(userPWError);
          toast.show();
        // else authentication failed
        } else {
          toast.setText(authFailError);
          toast.show();
        }
      } catch (Exception e) { // if the user does not exist
        toast.setText(e.getMessage());
        toast.show();
        return;
      }
    } else if (v == findViewById(R.id.add_user_button)) {
      try {
        String username = ((EditText) findViewById(R.id.username))
            .getText().toString();
        String password = ((EditText) findViewById(R.id.password))
            .getText().toString();
        String confirmPassword = ((EditText) findViewById(R.id.confirm_password))
            .getText().toString();
        
        // validate the user name and password
        Validator validator = new Validator();
        validator.validateUsername(username);
        validator.validatePassword(password, confirmPassword);
        
        database.addUser(username, password, confirmPassword);
        setContentView(R.layout.login);
        findViewById(R.id.btn_login).setOnClickListener(this);
        
        initializeLoginTextChangeListener();
      } catch (Exception e) { // validation failed
        toast.setText(e.getMessage());
        toast.show();
      }
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
  //  initializeLoginTextChangeListener();
    getMenuInflater().inflate(R.menu.activity_clinical_guide_login, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.menu_register_user) {
      setContentView(R.layout.register_user);
      
      // display username text area error message
      final Validator rv = new Validator();
      final EditText user = (EditText) findViewById(R.id.username);
      //user.requestFocus();
      user.addTextChangedListener(new TextWatcher() {
              @Override
              public void onTextChanged(CharSequence s, int start, int before, int count) {
                try{
                  rv.validateUsername(user.getText().toString());
                  user.setError(null);
                } catch (Exception e) {
                  user.setError(e.getMessage());
                }
              }

              @Override
              public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

              @Override
              public void afterTextChanged(Editable s) {}
          });
      
      // display password text area error message
      final EditText password = (EditText) findViewById(R.id.password);
      password.addTextChangedListener(new TextWatcher() {
              @Override
              public void onTextChanged(CharSequence s, int start, int before, int count) {
                try {
                  rv.validatePassword(password.getText().toString(), password.getText().toString());
                  // if an error occurs, setError(null) won't trigger because an exception is thrown
                  // in validatePassword
                  user.setError(null);
                } catch (Exception e) {
                  password.setError(e.getMessage());
                }
              }

              @Override
              public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

              @Override
              public void afterTextChanged(Editable s) {}
          });
      
      // display confirm password text area error message
      final EditText confirmPassword = (EditText) findViewById(R.id.confirm_password);
      confirmPassword.addTextChangedListener(new TextWatcher() {
              @Override
              public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(!password.getText().toString().equals(confirmPassword.getText().toString())) {
                  confirmPassword.setError("Passwords do not match.");
                }
              }

              @Override
              public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

              @Override
              public void afterTextChanged(Editable s) {}
          });
      
      findViewById(R.id.add_user_button).setOnClickListener(this);
      return true;
    }
    
    return super.onOptionsItemSelected(item);
  }

  public static User getUser() {
    return user;
  }
  public static Activity getActivity() {
    return mActivity;
  }
}
Java Source Code List
