Android Open Source - MyTesla Login Activity

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License

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

package com.myappfactory.tesla;
/* w w w.ja  va 2  s .  c  o m*/
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Build.VERSION;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.ContactsContract;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import org.androidannotations.annotations.Background;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.UiThread;
import org.androidannotations.annotations.ViewById;
import org.springframework.util.LinkedMultiValueMap;

import java.util.ArrayList;
import java.util.List;

/**
 * A login screen that offers login via email/password.
 */
@EActivity
public class LoginActivity extends FragmentActivity implements LoaderManager.LoaderCallbacks<Cursor> {

    // UI references.
    @ViewById(R.id.teslaTitle)
    TextView teslaTitle;
    @ViewById(R.id.email)
    AutoCompleteTextView mEmailView;
    @ViewById(R.id.password)
    EditText mPasswordView;
    @ViewById(R.id.login_form)
    View mLoginFormView;
    @ViewById(R.id.email_sign_in_button)
    Button mEmailSignInButton;
    @ViewById(R.id.progress_container)
    View mProgressView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        Typeface face= Typeface.createFromAsset(getAssets(),
                "fonts/TeslaNikolaCaps.ttf");

        teslaTitle.setTypeface(face);
        // Set up the login form.
        populateAutoComplete();

        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;
            }
        });

        mEmailSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });
    }

    private void populateAutoComplete() {
        if (VERSION.SDK_INT >= 14) {
            // Use ContactsContract.Profile (API 14+)
            getSupportLoaderManager().initLoader(0, null, this);
        } else if (VERSION.SDK_INT >= 8) {
            // Use AccountManager (API 8+)
            new SetupEmailAutoCompleteTask().execute(null, null);
        }
    }


    /**
     * 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.
        String email = mEmailView.getText().toString();
        String password = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;


        // Check for a valid password, if the user entered one.
        if (TextUtils.isEmpty(password)) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }

        // Check for a valid email address.
        if (TextUtils.isEmpty(email)) {
            mEmailView.setError(getString(R.string.error_field_required));
            focusView = mEmailView;
            cancel = true;
        } else if (!isEmailValid(email)) {
            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 {
            mHandler.sendEmptyMessage(0);
            doLogin(email, password);
        }
    }

    private boolean isEmailValid(String email) {
        return email.contains("@");
    }

    private Handler mHandler = new Handler() {
        public void handleMessage (Message msg) {
            switch (msg.what) {
                case 1:
                    showProgress(false);
                    break;
                case 0:
                default:
                    showProgress(true);
                    break;
            }
        }
    };
    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    public 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(show ? View.GONE : 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);
                }
            });

            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }

    @TargetApi(14)
    @Override
    public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
        return new CursorLoader(this,
                // Retrieve data rows for the device user's 'profile' contact.
                Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
                        ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,

                // Select only email addresses.
                ContactsContract.Contacts.Data.MIMETYPE +
                        " = ?", new String[]{ContactsContract.CommonDataKinds.Email
                                                                     .CONTENT_ITEM_TYPE},

                // Show primary email addresses first. Note that there won't be
                // a primary email address if the user hasn't specified one.
                ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
    }

    @Override
    public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
        List<String> emails = new ArrayList<String>();
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) {
            emails.add(cursor.getString(ProfileQuery.ADDRESS));
            cursor.moveToNext();
        }

        addEmailsToAutoComplete(emails);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> cursorLoader) {

    }

    private interface ProfileQuery {
        String[] PROJECTION = {
                ContactsContract.CommonDataKinds.Email.ADDRESS,
                ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
        };

        int ADDRESS = 0;
        int IS_PRIMARY = 1;
    }

    /**
     * Use an AsyncTask to fetch the user's email addresses on a background thread, and update
     * the email text field with results on the main UI thread.
     */
    class SetupEmailAutoCompleteTask extends AsyncTask<Void, Void, List<String>> {

        @Override
        protected List<String> doInBackground(Void... voids) {
            ArrayList<String> emailAddressCollection = new ArrayList<String>();

            // Get all emails from the user's contacts and copy them to a list.
            ContentResolver cr = getContentResolver();
            Cursor emailCur = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, null,
                    null, null, null);
            while (emailCur.moveToNext()) {
                String email = emailCur.getString(emailCur.getColumnIndex(ContactsContract
                        .CommonDataKinds.Email.DATA));
                emailAddressCollection.add(email);
            }
            emailCur.close();

            return emailAddressCollection;
        }

      @Override
      protected void onPostExecute(List<String> emailAddressCollection) {
         addEmailsToAutoComplete(emailAddressCollection);
      }
    }

    private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
        //Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
        ArrayAdapter<String> adapter =
                new ArrayAdapter<String>(LoginActivity.this,
                        android.R.layout.simple_dropdown_item_1line, emailAddressCollection);

        mEmailView.setAdapter(adapter);
    }

    @Background
    protected void doLogin (String email, String password) {
        TeslaApplication application = (TeslaApplication) getApplication();
        LinkedMultiValueMap<String, String> loginForm = new LinkedMultiValueMap<String, String>();
        loginForm.add("user_session[email]", email);
        loginForm.add("user_session[password]", password);
        application.getLoginClient().postLoginForm(loginForm);
        String userCredentials = application.getLoginClient().getCookie("user_credentials");
        if (userCredentials != null) {
            //Login was successful...set cookie in the other clients
            application.setCookie("user_credentials", userCredentials, true);

            finish();
        } else {
            //failed
            loginFailed();
        }
    }

    @UiThread
    protected void loginFailed () {
        mHandler.sendEmptyMessage(1);
        mEmailView.setError(getString(R.string.error_login_failed));
        mPasswordView.setError(getString(R.string.error_login_failed));
        mEmailView.requestFocus();
    }
}
Java Source Code List
