Added android project
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package com.uottawa.olympus.olympusservices;
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import android.animation.Animator;
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import android.animation.AnimatorListenerAdapter;
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import android.annotation.TargetApi;
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import android.content.pm.PackageManager;
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import android.support.annotation.NonNull;
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import android.support.design.widget.Snackbar;
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import android.support.v7.app.AppCompatActivity;
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import android.app.LoaderManager.LoaderCallbacks;
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import android.content.CursorLoader;
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import android.content.Loader;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.AsyncTask;
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import android.os.Build;
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import android.os.Bundle;
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import android.provider.ContactsContract;
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import android.text.TextUtils;
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import android.view.KeyEvent;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.inputmethod.EditorInfo;
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import android.widget.ArrayAdapter;
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import android.widget.AutoCompleteTextView;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.TextView;
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import java.util.ArrayList;
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import java.util.List;
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import static android.Manifest.permission.READ_CONTACTS;
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/**
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* A login screen that offers login via email/password.
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*/
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public class LoginActivity extends AppCompatActivity implements LoaderCallbacks<Cursor> {
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/**
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* Id to identity READ_CONTACTS permission request.
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*/
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private static final int REQUEST_READ_CONTACTS = 0;
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/**
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* A dummy authentication store containing known user names and passwords.
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* TODO: remove after connecting to a real authentication system.
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*/
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private static final String[] DUMMY_CREDENTIALS = new String[]{
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"foo@example.com:hello", "bar@example.com:world"
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};
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/**
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* Keep track of the login task to ensure we can cancel it if requested.
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*/
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private UserLoginTask mAuthTask = null;
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// UI references.
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private AutoCompleteTextView mEmailView;
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private EditText mPasswordView;
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private View mProgressView;
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private View mLoginFormView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_login);
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// Set up the login form.
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mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
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populateAutoComplete();
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mPasswordView = (EditText) findViewById(R.id.password);
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mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
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@Override
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public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
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if (id == EditorInfo.IME_ACTION_DONE || id == EditorInfo.IME_NULL) {
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attemptLogin();
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return true;
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}
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return false;
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}
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});
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Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
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mEmailSignInButton.setOnClickListener(new OnClickListener() {
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@Override
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public void onClick(View view) {
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attemptLogin();
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}
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});
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mLoginFormView = findViewById(R.id.login_form);
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mProgressView = findViewById(R.id.login_progress);
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}
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private void populateAutoComplete() {
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if (!mayRequestContacts()) {
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return;
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}
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getLoaderManager().initLoader(0, null, this);
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}
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private boolean mayRequestContacts() {
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if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
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return true;
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}
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if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
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return true;
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}
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if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
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Snackbar.make(mEmailView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)
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.setAction(android.R.string.ok, new View.OnClickListener() {
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@Override
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@TargetApi(Build.VERSION_CODES.M)
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public void onClick(View v) {
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requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
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}
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});
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} else {
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requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
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}
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return false;
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}
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/**
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* Callback received when a permissions request has been completed.
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*/
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@Override
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public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
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@NonNull int[] grantResults) {
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if (requestCode == REQUEST_READ_CONTACTS) {
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if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
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populateAutoComplete();
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}
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}
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}
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/**
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* Attempts to sign in or register the account specified by the login form.
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* If there are form errors (invalid email, missing fields, etc.), the
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* errors are presented and no actual login attempt is made.
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*/
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private void attemptLogin() {
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if (mAuthTask != null) {
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return;
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}
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// Reset errors.
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mEmailView.setError(null);
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mPasswordView.setError(null);
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// Store values at the time of the login attempt.
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String email = mEmailView.getText().toString();
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String password = mPasswordView.getText().toString();
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boolean cancel = false;
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View focusView = null;
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// Check for a valid password, if the user entered one.
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if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
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mPasswordView.setError(getString(R.string.error_invalid_password));
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focusView = mPasswordView;
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cancel = true;
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}
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// Check for a valid email address.
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if (TextUtils.isEmpty(email)) {
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mEmailView.setError(getString(R.string.error_field_required));
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focusView = mEmailView;
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cancel = true;
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} else if (!isEmailValid(email)) {
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mEmailView.setError(getString(R.string.error_invalid_email));
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focusView = mEmailView;
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cancel = true;
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}
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if (cancel) {
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// There was an error; don't attempt login and focus the first
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// form field with an error.
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focusView.requestFocus();
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} else {
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// Show a progress spinner, and kick off a background task to
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// perform the user login attempt.
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showProgress(true);
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mAuthTask = new UserLoginTask(email, password);
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mAuthTask.execute((Void) null);
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}
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}
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private boolean isEmailValid(String email) {
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//TODO: Replace this with your own logic
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return email.contains("@");
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}
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private boolean isPasswordValid(String password) {
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//TODO: Replace this with your own logic
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return password.length() > 4;
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}
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/**
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* Shows the progress UI and hides the login form.
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*/
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@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
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private void showProgress(final boolean show) {
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// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
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// for very easy animations. If available, use these APIs to fade-in
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// the progress spinner.
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
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int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
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mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
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mLoginFormView.animate().setDuration(shortAnimTime).alpha(
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show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
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@Override
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public void onAnimationEnd(Animator animation) {
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mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
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}
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});
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mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
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mProgressView.animate().setDuration(shortAnimTime).alpha(
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show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
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@Override
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public void onAnimationEnd(Animator animation) {
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mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
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}
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});
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} else {
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// The ViewPropertyAnimator APIs are not available, so simply show
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// and hide the relevant UI components.
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mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
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mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
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}
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}
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@Override
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public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
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return new CursorLoader(this,
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// Retrieve data rows for the device user's 'profile' contact.
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Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
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ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,
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// Select only email addresses.
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ContactsContract.Contacts.Data.MIMETYPE +
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" = ?", new String[]{ContactsContract.CommonDataKinds.Email
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.CONTENT_ITEM_TYPE},
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// Show primary email addresses first. Note that there won't be
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// a primary email address if the user hasn't specified one.
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ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
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}
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@Override
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public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
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List<String> emails = new ArrayList<>();
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cursor.moveToFirst();
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while (!cursor.isAfterLast()) {
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emails.add(cursor.getString(ProfileQuery.ADDRESS));
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cursor.moveToNext();
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}
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addEmailsToAutoComplete(emails);
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}
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@Override
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public void onLoaderReset(Loader<Cursor> cursorLoader) {
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}
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private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
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//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
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ArrayAdapter<String> adapter =
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new ArrayAdapter<>(LoginActivity.this,
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android.R.layout.simple_dropdown_item_1line, emailAddressCollection);
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mEmailView.setAdapter(adapter);
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}
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private interface ProfileQuery {
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String[] PROJECTION = {
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ContactsContract.CommonDataKinds.Email.ADDRESS,
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ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
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};
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int ADDRESS = 0;
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int IS_PRIMARY = 1;
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}
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/**
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* Represents an asynchronous login/registration task used to authenticate
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* the user.
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*/
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public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
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private final String mEmail;
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private final String mPassword;
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UserLoginTask(String email, String password) {
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mEmail = email;
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mPassword = password;
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}
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@Override
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protected Boolean doInBackground(Void... params) {
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// TODO: attempt authentication against a network service.
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try {
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// Simulate network access.
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Thread.sleep(2000);
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} catch (InterruptedException e) {
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return false;
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}
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for (String credential : DUMMY_CREDENTIALS) {
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String[] pieces = credential.split(":");
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if (pieces[0].equals(mEmail)) {
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// Account exists, return true if the password matches.
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return pieces[1].equals(mPassword);
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}
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}
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// TODO: register the new account here.
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return true;
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}
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@Override
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protected void onPostExecute(final Boolean success) {
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mAuthTask = null;
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showProgress(false);
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if (success) {
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finish();
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} else {
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mPasswordView.setError(getString(R.string.error_incorrect_password));
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mPasswordView.requestFocus();
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}
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}
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@Override
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protected void onCancelled() {
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mAuthTask = null;
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showProgress(false);
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}
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}
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}
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