Android Open Source - spotastop Login Activity

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Back to project page spotastop.
License

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

package com.cipciop.spotastop;
//from  w  w w . ja  v  a  2 s. c  om
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.cipciop.spotastop.domain.Line;
import com.cipciop.spotastop.presentation.BusLineItem;
import com.cipciop.spotastop.services.LoginService;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends Activity {
  /**
   * A dummy authentication store containing known user names and passwords.
   * TODO: remove after connecting to a real authentication system.
   */
  private static final String[] DUMMY_CREDENTIALS = new String[] {
      "foo@example.com:hello", "bar@example.com:world" };

  /**
   * The default email to populate the email field with.
   */
  public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL";

  // Values for email and password at the time of the login attempt.
  private String mEmail;
  private String mPassword;

  // UI references.
  private EditText mEmailView;
  private EditText mPasswordView;
  private View mLoginFormView;
  private View mLoginStatusView;
  private TextView mLoginStatusMessageView;

  @SuppressLint("NewApi")
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_login);

    StopSpotApp.getInstance().setPrefs(getPreferences(MODE_PRIVATE));

    // Set up the login form.
    mLoginFormView = findViewById(R.id.login_form);
    mLoginStatusView = findViewById(R.id.login_status);
    mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

    mEmail = StopSpotApp.getInstance().getInsertedUsername();

    mEmailView = (EditText) findViewById(R.id.email);

    mEmailView.setText(mEmail);

    mPassword = StopSpotApp.getInstance().getInsertedPassword();

    mPasswordView = (EditText) findViewById(R.id.password);

    mPasswordView.setText(mPassword);

    if (mEmail != null) {
      mLoginStatusMessageView.setText("Tentativo di accesso come "
          + mEmail);
    }

    mPasswordView
        .setOnEditorActionListener(new TextView.OnEditorActionListener() {
          @Override
          public boolean onEditorAction(TextView textView, int id,
              KeyEvent keyEvent) {
            if (id == R.id.login || id == EditorInfo.IME_NULL) {
              attemptLogin();
              return true;
            }
            return false;
          }
        });

    findViewById(R.id.sign_in_button).setOnClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View view) {
            attemptLogin();
          }
        });
    findViewById(R.id.register_button).setOnClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View view) {
            Intent i = new Intent(LoginActivity.this,
                RegisterActivity.class);
            startActivity(i);
          }
        });
    this.getWindow().setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
      final int animTime = getResources().getInteger(
          android.R.integer.config_longAnimTime);
      ((ViewGroup) findViewById(R.id.interactive)).animate()
          .setDuration(animTime).alpha(1);
    } else
      ((ViewGroup) findViewById(R.id.interactive)).setAlpha(1);

  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    getMenuInflater().inflate(R.menu.login, menu);
    return true;
  }

  /**
   * 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() {

    // Reset errors.
    mEmailView.setError(null);
    mPasswordView.setError(null);

    // Store values at the time of the login attempt.
    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() < 4) {
      mPasswordView.setError(getString(R.string.error_invalid_password));
      focusView = mPasswordView;
      cancel = true;
    }

    // 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;
    }

    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);
      requestLogin();
    }
  }

  /**
   * 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);

      mLoginFormView.setVisibility(View.VISIBLE);
      mLoginFormView.animate().setDuration(shortAnimTime)
          .alpha(show ? 0 : 1)
          .setListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
              mLoginFormView.setVisibility(show ? View.GONE
                  : View.VISIBLE);
            }
          });
    } else {
      mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
    }
  }

  public void requestLogin() {
    StopSpotApp.getInstance().setInsertedUsername(mEmail);
    StopSpotApp.getInstance().setInsertedPassword(mPassword);
    Intent i = new Intent(LoginActivity.this, LoginService.class);
    startService(i);
  }

  private BroadcastReceiver loginDoneReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
      if (StopSpotApp.getInstance().getLoggedUser() != null) {
        Intent i = new Intent(LoginActivity.this, SelectBusLine.class);
        startActivity(i);
      } else {
        showProgress(false);
        mLoginStatusMessageView.setText(R.string.invalid_login);
        Toast.makeText(context, "Failed to login", Toast.LENGTH_LONG)
            .show();
      }
    }

  };

  /* Request updates at startup */
  @Override
  protected void onResume() {
    super.onResume();
    IntentFilter focusChangedFilter = new IntentFilter();
    focusChangedFilter.addAction("com.cipciop.spotastop.loginDone");
    this.registerReceiver(this.loginDoneReceiver, focusChangedFilter);
  }

  /* Remove the locationlistener updates when Activity is paused */
  @SuppressLint("NewApi")
  @Override
  protected void onPause() {
    super.onPause();
    this.unregisterReceiver(this.loginDoneReceiver);
  }

}
Java Source Code List
