Android Open Source - FisgoDroid Login Activity

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Back to project page FisgoDroid.
License

The source code is released under:
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Java Source Code

package net.meneame.fisgodroid;
//  w  ww  .  jav  a2  s .com
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.TextView;

import com.google.analytics.tracking.android.EasyTracker;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends ActionBarActivity
{
    // Shared preferences settings for remember username/password feature.
    private static final String PREFS_NAME = "FisgoDroid";
    private static final String PREF_USERNAME = "username";
    private static final String PREF_PASSWORD = "password";

    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private UserLoginTask mAuthTask = null;

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

    // UI references.
    private EditText mUsernameView;
    private EditText mPasswordView;
    private CheckBox mRememberMeCheckbox;
    private View mLoginFormView;
    private View mLoginStatusView;
    private TextView mLoginStatusMessageView;

    // Reference to the service binder
    private FisgoService.FisgoBinder mFisgoBinder = null;
    private ServiceConnection mServiceConn = new ServiceConnection()
    {
        @Override
        public void onServiceConnected(ComponentName arg0, IBinder binder)
        {
            mFisgoBinder = (FisgoService.FisgoBinder) binder;
            if ( mFisgoBinder.isLoggedIn() == true )
            {
                goToChat();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0)
        {
        }
    };

    @Override
    protected void onResume()
    {
        super.onResume();

        // Start and bind the chat service
        Intent intent = new Intent(this, FisgoService.class);
        startService(intent);
        bindService(intent, mServiceConn, BIND_AUTO_CREATE);
    }

    @Override
    protected void onStart()
    {
        super.onStart();
        EasyTracker.getInstance(this).activityStart(this);
    }

    @Override
    protected void onStop()
    {
        super.onStop();
        EasyTracker.getInstance(this).activityStop(this);
        unbindService(mServiceConn);
    }

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

        setContentView(R.layout.activity_login);

        // Set up the login form.
        mUsernameView = (EditText) findViewById(R.id.chat_username);
        mPasswordView = (EditText) findViewById(R.id.password);
        mRememberMeCheckbox = (CheckBox) findViewById(R.id.checkbox_remember_me);

        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;
            }
        });

        // Restore remembered username / password
        SharedPreferences pref = getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
        String username = pref.getString(PREF_USERNAME, null);
        String password = pref.getString(PREF_PASSWORD, null);
        if ( username != null && password != null )
        {
            mUsernameView.setText(username);
            mPasswordView.setText(password);
            mRememberMeCheckbox.setChecked(true);
        }

        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()
        {
            @Override
            public void onClick(View view)
            {
                attemptLogin();
            }
        });

        // Handle clicks on the "Remember me" checkbox to
        // forget credentials when disabling it.
        mRememberMeCheckbox.setOnCheckedChangeListener(new OnCheckedChangeListener()
        {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
            {
                if ( !isChecked )
                    rememberCredentials(null, null);
            }
        });
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch (item.getItemId())
        {
        case R.id.action_settings:
            startActivity(new Intent(this, SettingsActivity.class));
            return true;
        }

        return false;
    }

    /**
     * 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;
        }

        // Hide the soft keyboard
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(mUsernameView.getWindowToken(), 0);
        imm.hideSoftInputFromWindow(mPasswordView.getWindowToken(), 0);

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

        // Store values at the time of the login attempt.
        mUsername = mUsernameView.getText().toString().trim();
        mPassword = mPasswordView.getText().toString().trim();
        mRememberMe = mRememberMeCheckbox.isChecked();

        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;
        }

        // Check for a valid email address.
        if ( TextUtils.isEmpty(mUsername) )
        {
            mUsernameView.setError(getString(R.string.error_field_required));
            focusView = mUsernameView;
            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()
            {
                @Override
                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()
            {
                @Override
                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);
        }

        ActionBar actionBar = getSupportActionBar();
        if ( show )
        {
            actionBar.hide();
        }
        else
        {
            actionBar.show();
        }
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, LoginStatus>
    {
        @Override
        protected LoginStatus doInBackground(Void... params)
        {
            if ( mFisgoBinder == null )
                return LoginStatus.NETWORK_FAILED;

            try
            {
                return mFisgoBinder.logIn(mUsername, mPassword);
            }
            catch (IllegalArgumentException e)
            {
                return LoginStatus.INVALID_USERNAME;
            }
        }

        @Override
        protected void onPostExecute(final LoginStatus status)
        {
            mAuthTask = null;
            showProgress(false);

            if ( status == LoginStatus.OK )
            {
                if ( mRememberMe )
                {
                    rememberCredentials(mUsername, mPassword);
                }
                goToChat();
            }
            else
            {
                if ( status == LoginStatus.INVALID_USERNAME )
                {
                    mUsernameView.setError(getString(R.string.error_incorrect_username));
                    mUsernameView.requestFocus();
                }
                else if ( status == LoginStatus.INVALID_PASSWORD )
                {
                    mPasswordView.setError(getString(R.string.error_incorrect_password));
                    mPasswordView.requestFocus();
                }
                else if ( status == LoginStatus.NETWORK_FAILED )
                {
                    mUsernameView.setError(getString(R.string.error_network_failed));
                    mUsernameView.requestFocus();
                }
            }
        }

        @Override
        protected void onCancelled()
        {
            mAuthTask = null;
            showProgress(false);
        }
    }

    private void rememberCredentials(String username, String password)
    {
        getSharedPreferences(PREFS_NAME, MODE_PRIVATE).edit().putString(PREF_USERNAME, username).putString(PREF_PASSWORD, password).commit();
    }

    private void goToChat()
    {
        Intent intent = new Intent(LoginActivity.this, ChatActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
        finish();
    }
}
Java Source Code List
