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+package stronglogic.cointrx;
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+
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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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+
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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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+
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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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+
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+import java.util.ArrayList;
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+import java.util.List;
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+
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+import static android.Manifest.permission.READ_CONTACTS;
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+
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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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+ /**
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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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+ /**
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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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+
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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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+
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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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+
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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 == R.id.login || 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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+
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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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+
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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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+
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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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+
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+ getLoaderManager().initLoader(0, null, this);
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+ }
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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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+ /**
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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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+
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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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+
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+ // Reset errors.
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+ mEmailView.setError(null);
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+ mPasswordView.setError(null);
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+
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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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+
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+ boolean cancel = false;
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+ View focusView = null;
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+
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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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+
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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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+
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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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+
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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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+
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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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+ /**
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ addEmailsToAutoComplete(emails);
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+ }
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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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+ }
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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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+
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+ mEmailView.setAdapter(adapter);
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+ }
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+
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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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+
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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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+ /**
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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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+
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+ private final String mEmail;
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+ private final String mPassword;
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+
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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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+
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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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+
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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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+
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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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+
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+ // TODO: register the new account here.
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+ return true;
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+ }
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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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+
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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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+
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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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+
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