Validation for login page

February 14, 2018 androindian

4241 views.

here we are testing validation with empty as well as some other conditions please find the code below.

validation
1. A process associated with the collection and production of intelligence that confirms that an intelligence collection or production requirement is sufficiently important to justify the dedication of intelligence resources does not duplicate an existing requirement and has not been previously satisfied.
2. In computer modelling and simulation, the process of determining the degree to which a model or simulation is an accurate representation of the real world from the perspective of the intended uses of the model or simulation.
3. Execution procedure used by combatant command components, supporting combatant commanders, and providing organizations to conform to the supported commander and US Transportation Command that all the information records in a time-phased force and deployment data not only are error-free for automation purposes, but also accurately reflect the current status, attributes, and availability of units and requirements. Unit readiness, movement dates, passengers, and cargo details should be confirmed with the unit before validation occurs. See also independent review; time-phased force and deployment data; verification.

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.androindian.raj.login.LoginActivity">

    <!-- Login progress -->
    <ProgressBar
        android:id="@+id/login_progress"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:visibility="gone" />

    <ScrollView
        android:id="@+id/login_form"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:id="@+id/email_login_form"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <AutoCompleteTextView
                    android:id="@+id/email"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_email"
                    android:inputType="textEmailAddress"
                    android:maxLines="1"
                    android:singleLine="true" />

            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <EditText
                    android:id="@+id/password"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_password"
                    android:imeActionId="6"
                    android:imeActionLabel="@string/action_sign_in_short"
                    android:imeOptions="actionUnspecified"
                    android:inputType="textPassword"
                    android:maxLines="1"
                    android:singleLine="true" />

            </android.support.design.widget.TextInputLayout>

            <Button
                android:id="@+id/email_sign_in_button"
                style="?android:textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="@string/action_sign_in"
                android:textStyle="bold" />

        </LinearLayout>
    </ScrollView>
</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center_horizontal"

android:orientation="vertical"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.androindian.raj.login.LoginActivity">

<ProgressBar

android:id="@+id/login_progress"

style="?android:attr/progressBarStyleLarge"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginBottom="8dp"

android:visibility="gone" />

<ScrollView

android:id="@+id/login_form"

android:layout_width="match_parent"

android:layout_height="match_parent">

<LinearLayout

android:id="@+id/email_login_form"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="vertical">

<android.support.design.widget.TextInputLayout

android:layout_width="match_parent"

android:layout_height="wrap_content">

<AutoCompleteTextView

android:id="@+id/email"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:hint="@string/prompt_email"

android:inputType="textEmailAddress"

android:maxLines="1"

android:singleLine="true" />

</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout

android:layout_width="match_parent"

android:layout_height="wrap_content">

<EditText

android:id="@+id/password"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:hint="@string/prompt_password"

android:imeActionId="6"

android:imeActionLabel="@string/action_sign_in_short"

android:imeOptions="actionUnspecified"

android:inputType="textPassword"

android:maxLines="1"

android:singleLine="true" />

</android.support.design.widget.TextInputLayout>

<Button

android:id="@+id/email_sign_in_button"

style="?android:textAppearanceSmall"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="16dp"

android:text="@string/action_sign_in"

android:textStyle="bold" />

</LinearLayout>

</ScrollView>

</LinearLayout>

MainActivity.Java

package com.androindian.raj.login;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.app.LoaderManager.LoaderCallbacks;

import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;

import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
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 java.util.ArrayList;
import java.util.List;

import static android.Manifest.permission.READ_CONTACTS;

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

    /**
     * Id to identity READ_CONTACTS permission request.
     */
    private static final int REQUEST_READ_CONTACTS = 0;

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

    // UI references.
    private AutoCompleteTextView mEmailView;
    private EditText mPasswordView;
    private View mProgressView;
    private View mLoginFormView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        // Set up the login form.
        mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
        populateAutoComplete();

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

        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
        mEmailSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
    }

    private void populateAutoComplete() {
        if (!mayRequestContacts()) {
            return;
        }

        getLoaderManager().initLoader(0, null, this);
    }

    private boolean mayRequestContacts() {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            return true;
        }
        if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
            Snackbar.make(mEmailView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)
                    .setAction(android.R.string.ok, new View.OnClickListener() {
                        @Override
                        @TargetApi(Build.VERSION_CODES.M)
                        public void onClick(View v) {
                            requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
                        }
                    });
        } else {
            requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
        }
        return false;
    }

    /**
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == REQUEST_READ_CONTACTS) {
            if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                populateAutoComplete();
            }
        }
    }


    /**
     * 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.
     */
    private void attemptLogin() {
        if (mAuthTask != null) {
            return;
        }

        // 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) && !isPasswordValid(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 {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            showProgress(true);
            mAuthTask = new UserLoginTask(email, password);
            mAuthTask.execute((Void) null);
        }
    }

    private boolean isEmailValid(String email) {
        //TODO: Replace this with your own logic
        return email.contains("@");
    }

    private boolean isPasswordValid(String password) {
        //TODO: Replace this with your own logic
        return password.length() > 4;
    }

    /**
     * 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(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);
        }
    }

    @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<>();
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) {
            emails.add(cursor.getString(ProfileQuery.ADDRESS));
            cursor.moveToNext();
        }

        addEmailsToAutoComplete(emails);
    }

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

    }

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

        mEmailView.setAdapter(adapter);
    }


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

        int ADDRESS = 0;
        int IS_PRIMARY = 1;
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

        private final String mEmail;
        private final String mPassword;

        UserLoginTask(String email, String password) {
            mEmail = email;
            mPassword = password;
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            // TODO: attempt authentication against a network service.

            try {
                // Simulate network access.
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                return false;
            }

            for (String credential : DUMMY_CREDENTIALS) {
                String[] pieces = credential.split(":");
                if (pieces[0].equals(mEmail)) {
                    // Account exists, return true if the password matches.
                    return pieces[1].equals(mPassword);
                }
            }

            // TODO: register the new account here.
            return true;
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
                finish();
            } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }

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

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package com.androindian.raj.login;

import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.annotation.TargetApi;

import android.content.pm.PackageManager;

import android.support.annotation.NonNull;

import android.support.design.widget.Snackbar;

import android.support.v7.app.AppCompatActivity;

import android.app.LoaderManager.LoaderCallbacks;

import android.content.CursorLoader;

import android.content.Loader;

import android.database.Cursor;

import android.net.Uri;

import android.os.AsyncTask;

import android.os.Build;

import android.os.Bundle;

import android.provider.ContactsContract;

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 java.util.ArrayList;

import java.util.List;

import static android.Manifest.permission.READ_CONTACTS;

/**

* A login screen that offers login via email/password.

public class LoginActivity extends AppCompatActivity implements LoaderCallbacks<Cursor> {

/**

* Id to identity READ_CONTACTS permission request.

private static final int REQUEST_READ_CONTACTS = 0;

/**

* 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"

};

/**

* Keep track of the login task to ensure we can cancel it if requested.

private UserLoginTask mAuthTask = null;

// UI references.

private AutoCompleteTextView mEmailView;

private EditText mPasswordView;

private View mProgressView;

private View mLoginFormView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_login);

// Set up the login form.

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

populateAutoComplete();

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

mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {

@Override

public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {

if (id == EditorInfo.IME_ACTION_DONE || id == EditorInfo.IME_NULL) {

attemptLogin();

return true;

}

return false;

}

});

Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);

mEmailSignInButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View view) {

attemptLogin();

}

});

mLoginFormView = findViewById(R.id.login_form);

mProgressView = findViewById(R.id.login_progress);

}

private void populateAutoComplete() {

if (!mayRequestContacts()) {

return;

}

getLoaderManager().initLoader(0, null, this);

}

private boolean mayRequestContacts() {

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {

return true;

}

if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {

return true;

}

if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {

Snackbar.make(mEmailView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)

.setAction(android.R.string.ok, new View.OnClickListener() {

@Override

@TargetApi(Build.VERSION_CODES.M)

public void onClick(View v) {

requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);

}

});

} else {

requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);

}

return false;

}

/**

* Callback received when a permissions request has been completed.

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,

@NonNull int[] grantResults) {

if (requestCode == REQUEST_READ_CONTACTS) {

if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

populateAutoComplete();

}

/**

* 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.

private void attemptLogin() {

if (mAuthTask != null) {

return;

}

// 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) && !isPasswordValid(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 {

// Show a progress spinner, and kick off a background task to

// perform the user login attempt.

showProgress(true);

mAuthTask = new UserLoginTask(email, password);

mAuthTask.execute((Void) null);

}

private boolean isEmailValid(String email) {

//TODO: Replace this with your own logic

return email.contains("@");

}

private boolean isPasswordValid(String password) {

//TODO: Replace this with your own logic

return password.length() > 4;

}

/**

* 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(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);

}

@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<>();

cursor.moveToFirst();

while (!cursor.isAfterLast()) {

emails.add(cursor.getString(ProfileQuery.ADDRESS));

cursor.moveToNext();

}

addEmailsToAutoComplete(emails);

}

@Override

public void onLoaderReset(Loader<Cursor> cursorLoader) {

}

private void addEmailsToAutoComplete(List<String> emailAddressCollection) {

//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.

ArrayAdapter<String> adapter =

new ArrayAdapter<>(LoginActivity.this,

android.R.layout.simple_dropdown_item_1line, emailAddressCollection);

mEmailView.setAdapter(adapter);

}

private interface ProfileQuery {

String[] PROJECTION = {

ContactsContract.CommonDataKinds.Email.ADDRESS,

ContactsContract.CommonDataKinds.Email.IS_PRIMARY,

};

int ADDRESS = 0;

int IS_PRIMARY = 1;

}

/**

* Represents an asynchronous login/registration task used to authenticate

* the user.

public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

private final String mEmail;

private final String mPassword;

UserLoginTask(String email, String password) {

mEmail = email;

mPassword = password;

}

@Override

protected Boolean doInBackground(Void... params) {

// TODO: attempt authentication against a network service.

try {

// Simulate network access.

Thread.sleep(2000);

} catch (InterruptedException e) {

return false;

}

for (String credential : DUMMY_CREDENTIALS) {

String[] pieces = credential.split(":");

if (pieces[0].equals(mEmail)) {

// Account exists, return true if the password matches.

return pieces[1].equals(mPassword);

}

// TODO: register the new account here.

return true;

}

@Override

protected void onPostExecute(final Boolean success) {

mAuthTask = null;

showProgress(false);

if (success) {

finish();

} else {

mPasswordView.setError(getString(R.string.error_incorrect_password));

mPasswordView.requestFocus();

}

@Override

protected void onCancelled() {

mAuthTask = null;

showProgress(false);

}

Validation for login page

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