Android Open Source - Android-SDK Login Activity

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

/*
 * Copyright (C) 2014./*from w  w  w  .  ja v a  2s  .  c om*/
 *
 * BaasBox - info@baasbox.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */

package com.baasbox.android.samples.aloa.activities;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
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.EditText;
import android.widget.TextView;

import com.baasbox.android.BaasHandler;
import com.baasbox.android.BaasResult;
import com.baasbox.android.BaasUser;
import com.baasbox.android.RequestToken;
import com.baasbox.android.samples.aloa.Data;
import com.baasbox.android.samples.aloa.R;
import com.baasbox.android.samples.aloa.utils.BaseActivity;

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

 */
public class LoginActivity extends BaseActivity{

    private static final String CURRENT_AUTH_REQUEST = "current_auth_request";
    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private RequestToken mAuth = null;

    // UI references.
    private EditText mEmailView;
    private EditText mPasswordView;
    private EditText mFlowerView;
    private View mProgressView;
    private View mLoginFormView;
    private BaasHandler<BaasUser> loginHandler = new BaasHandler<BaasUser>() {
        @Override
        public void handle(BaasResult<BaasUser> result) {
            mAuth = null;
            showProgress(false);
            if (result.isSuccess()){
                finish();
            } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }
    };

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

        // Set up the login form.
        mEmailView = (EditText) findViewById(R.id.in_email);
//        populateAutoComplete();

        mPasswordView = (EditText) findViewById(R.id.in_password);
        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;
            }
        });

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

        View signIn = findViewById(R.id.btn_signin);
        View register = findViewById(R.id.btn_register);
        View.OnClickListener listener = new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (v.getId()==R.id.btn_signin){
                    attemptLogin();
                } else {
                    attemptRegister();
                }

            }
        };
        signIn.setOnClickListener(listener);
        register.setOnClickListener(listener);

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
        if (savedInstanceState!=null) {
            mAuth = RequestToken.loadAndResume(savedInstanceState, CURRENT_AUTH_REQUEST, loginHandler);
        }
        if (mAuth!=null){
            showProgress(true);
        }

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mAuth!=null&& mAuth.suspendAndSave(outState,CURRENT_AUTH_REQUEST)){
            showProgress(false);
        }
    }

    private void attemptRegister() {
        if (mAuth != null){
            return;
        }

        mEmailView.setError(null);
        mPasswordView.setError(null);
        mFlowerView.setError(null);

        String email = mEmailView.getText().toString();
        String password= mPasswordView.getText().toString();
        String flower = mFlowerView.getText().toString();

        boolean cancel = false;
        View focusView = null;


        if (TextUtils.isEmpty(password) || !isPasswordValid(password)){
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView=mPasswordView;
            cancel = true;
        }

        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 (TextUtils.isEmpty(flower)){
            mFlowerView.setError(getString(R.string.error_field_required));
            focusView = mFlowerView;
            cancel = true;
        }

        if (cancel) {
            focusView.requestFocus();
        } else {
            showProgress(true);
            BaasUser user = BaasUser.withUserName(email)
                                    .setPassword(password);
            user.getScope(BaasUser.Scope.PUBLIC).put(Data.FLOWERS, flower);
            mAuth =user.signup(loginHandler);
        }
    }

    /**
     * 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 (mAuth != 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);
            mAuth = BaasUser.withUserName(email)
                            .setPassword(password)
                            .login(loginHandler);

        }
    }

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

    private boolean isPasswordValid(String password) {
        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);
        }
    }

//    /**
//     * 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);
//        }
//    }
}
Java Source Code List
