initial commit

.gitignore

@@ -0,0 +1,11 @@
+.gradle
+local.properties
+.idea
+.DS_Store
+build/
+*.aar
+*.iml
+*.jks
+*.apk
+
+*.pem

CONTRIBUTING.md

@@ -0,0 +1,23 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.

LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   Copyright 2017 Google Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
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+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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+   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.

README.md

@@ -0,0 +1,13 @@
+# paymentsapi-quickstart
+
+## Overview
+This sample demonstrates basic usage of the Google Payment API.  For more
+information, visit the following link:
+
+https://developers.google.com/payments/overview
+
+## Instructions
+
+Make sure you read the comments in Constants.java and PaymentsUtil.java before
+you continue. These files **must** be modified prior to running the app, as per
+the instructions provided in the comments.

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.0"
+    defaultConfig {
+        applicationId "com.google.android.gms.samples.wallet"
+        minSdkVersion 26
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            shrinkResources true
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile 'com.android.support:appcompat-v7:26.0.2'
+    compile 'com.google.android.gms:play-services-wallet:11.4.0'
+    compile 'com.google.android.gms:play-services-tasks:11.4.0'
+    compile 'com.google.android.gms:play-services-base:11.4.0'
+    compile 'com.google.android.gms:play-services-basement:11.4.0'
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,28 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+
+    package="com.google.android.gms.samples.wallet">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true">
+
+        <activity
+            android:name="CheckoutActivity"
+            android:label="@string/store_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <!-- This element is required in order to use the PaymentsClient -->
+        <meta-data
+            android:name="com.google.android.gms.wallet.api.enabled"
+            android:value="true" />
+
+    </application>
+
+</manifest>

app/src/main/java/com/google/android/gms/samples/wallet/CheckoutActivity.java

@@ -0,0 +1,185 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.google.android.gms.samples.wallet;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.google.android.gms.common.api.ApiException;
+import com.google.android.gms.common.api.Status;
+import com.google.android.gms.tasks.OnCompleteListener;
+import com.google.android.gms.tasks.Task;
+import com.google.android.gms.wallet.AutoResolveHelper;
+import com.google.android.gms.wallet.PaymentData;
+import com.google.android.gms.wallet.PaymentDataRequest;
+import com.google.android.gms.wallet.PaymentMethodToken;
+import com.google.android.gms.wallet.PaymentsClient;
+import com.google.android.gms.wallet.TransactionInfo;
+import com.google.android.gms.wallet.WalletConstants;
+
+public class CheckoutActivity extends Activity {
+    // Arbitrarily-picked result code.
+    private static final int LOAD_PAYMENT_DATA_REQUEST_CODE = 991;
+
+    private PaymentsClient mPaymentsClient;
+
+    private View mPwgButton;
+    private TextView mPwgStatusText;
+
+    private ItemInfo mBikeItem = new ItemInfo("Simple Bike", 300 * 1000000, R.drawable.bike);
+    private long mShippingCost = 90 * 1000000;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_checkout);
+
+        // Set up the mock information for our item in the UI.
+        initItemUI();
+
+        mPwgButton = findViewById(R.id.pwg_button);
+        mPwgStatusText = findViewById(R.id.pwg_status);
+
+        mPwgButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                requestPayment(view);
+            }
+        });
+
+        // It's recommended to create the PaymentsClient object inside of the onCreate method.
+        mPaymentsClient = PaymentsUtil.createPaymentsClient(this);
+        checkIsReadyToPay();
+    }
+
+    private void checkIsReadyToPay() {
+        // The call to isReadyToPay is asynchronous and returns a Task. We need to provide an
+        // OnCompleteListener to be triggered when the result of the call is known.
+        PaymentsUtil.isReadyToPay(mPaymentsClient).addOnCompleteListener(
+                new OnCompleteListener<Boolean>() {
+                    public void onComplete(Task<Boolean> task) {
+                        try {
+                            boolean result = task.getResult(ApiException.class);
+                            setPwgAvailable(result);
+                        } catch (ApiException exception) {
+                            // Process error
+                            Log.w("isReadyToPay failed", exception);
+                        }
+                    }
+                });
+    }
+
+    private void setPwgAvailable(boolean available) {
+        // If isReadyToPay returned true, show the button and hide the "checking" text. Otherwise,
+        // notify the user that Pay with Google is not available.
+        // Please adjust to fit in with your current user flow. You are not required to explicitly
+        // let the user know if isReadyToPay returns false.
+        if (available) {
+            mPwgStatusText.setVisibility(View.GONE);
+            mPwgButton.setVisibility(View.VISIBLE);
+        } else {
+            mPwgStatusText.setText(R.string.pwg_status_unavailable);
+        }
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        switch (requestCode) {
+            case LOAD_PAYMENT_DATA_REQUEST_CODE:
+                switch (resultCode) {
+                    case Activity.RESULT_OK:
+                        PaymentData paymentData = PaymentData.getFromIntent(data);
+                        handlePaymentSuccess(paymentData);
+                        break;
+                    case Activity.RESULT_CANCELED:
+                        // Nothing to here normally - the user simply cancelled without selecting a
+                        // payment method.
+                        break;
+                    case AutoResolveHelper.RESULT_ERROR:
+                        Status status = AutoResolveHelper.getStatusFromIntent(data);
+                        handleError(status.getStatusCode());
+                        break;
+                }
+
+                // Re-enables the Pay with Google button.
+                mPwgButton.setClickable(true);
+                break;
+        }
+    }
+
+    private void handlePaymentSuccess(PaymentData paymentData) {
+        // PaymentMethodToken contains the payment information, as well as any additional
+        // requested information, such as billing and shipping address.
+        //
+        // Refer to your processor's documentation on how to proceed from here.
+        PaymentMethodToken token = paymentData.getPaymentMethodToken();
+
+        // getPaymentMethodToken will only return null if PaymentMethodTokenizationParameters was
+        // not set in the PaymentRequest.
+        if (token != null) {
+            String billingName = paymentData.getCardInfo().getBillingAddress().getName();
+            Toast.makeText(this, getString(R.string.payments_show_name, billingName), Toast.LENGTH_LONG).show();
+
+            // Use token.getToken() to get the token string.
+            Log.d("PaymentData", "PaymentMethodToken received");
+        }
+    }
+
+    private void handleError(int statusCode) {
+        // At this stage, the user has already seen a popup informing them an error occurred.
+        // Normally, only logging is required.
+        // statusCode will hold the value of any constant from CommonStatusCode or one of the
+        // WalletConstants.ERROR_CODE_* constants.
+        Log.w("loadPaymentData failed", String.format("Error code: %d", statusCode));
+    }
+
+    // This method is called when the Pay with Google button is clicked.
+    public void requestPayment(View view) {
+        // Disables the button to prevent multiple clicks.
+        mPwgButton.setClickable(false);
+
+        // The price provided to the API should include taxes and shipping.
+        // This price is not displayed to the user.
+        String price = PaymentsUtil.microsToString(mBikeItem.getPriceMicros() + mShippingCost);
+
+        TransactionInfo transaction = PaymentsUtil.createTransaction(price);
+        PaymentDataRequest request = PaymentsUtil.createPaymentDataRequest(transaction);
+        Task<PaymentData> futurePaymentData = mPaymentsClient.loadPaymentData(request);
+
+        // Since loadPaymentData may show the UI asking the user to select a payment method, we use
+        // AutoResolveHelper to wait for the user interacting with it. Once completed,
+        // onActivityResult will be called with the result.
+        AutoResolveHelper.resolveTask(futurePaymentData, this, LOAD_PAYMENT_DATA_REQUEST_CODE);
+    }
+
+    private void initItemUI() {
+        TextView itemName = findViewById(R.id.text_item_name);
+        ImageView itemImage = findViewById(R.id.image_item_image);
+        TextView itemPrice = findViewById(R.id.text_item_price);
+
+        itemName.setText(mBikeItem.getName());
+        itemImage.setImageResource(mBikeItem.getImageResourceId());
+        itemPrice.setText(PaymentsUtil.microsToString(mBikeItem.getPriceMicros()));
+    }
+}

app/src/main/java/com/google/android/gms/samples/wallet/Constants.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.google.android.gms.samples.wallet;
+
+import android.util.Pair;
+
+import com.google.android.gms.wallet.WalletConstants;
+
+import java.io.UncheckedIOException;
+import java.util.Arrays;
+import java.util.List;
+
+public class Constants {
+    // This file contains several constants you must edit before proceeding. Once you're done,
+    // remove this static block and run the sample.
+    // Before you start, please take a look at PaymentsUtil.java to see where the constants are used
+    // and to potentially remove ones not relevant to your integration.
+    // Required changes:
+    // 1.  Update SUPPORTED_NETWORKS and SUPPORTED_METHODS if required (consult your processor if
+    //     unsure).
+    // 2.  Update CURRENCY_CODE to the currency you use.
+    // 3.  Update SHIPPING_SUPPORTED_COUNTRIES to list the countries where you currently ship. If
+    //     this is not applicable to your app, remove the relevant bits from PaymentsUtil.java.
+    // 4.  If you're integrating with your processor / gateway directly, update
+    //     GATEWAY_TOKENIZATION_NAME and GATEWAY_TOKENIZATION_PARAMETERS per the instructions they
+    //     provided. You don't need to update DIRECT_TOKENIZATION_PUBLIC_KEY.
+    // 5.  If you're using direct integration, please consult the documentation to learn about
+    //     next steps.
+    static {
+        if (true) {
+            throw new RuntimeException("[REMOVE ME] Please edit the Constants.java file per the"
+                    + " instructions inside before trying to run this sample.");
+        }
+    }
+
+    // Changing this to ENVIRONMENT_PRODUCTION will make the API return real card information.
+    // Please refer to the documentation to read about the required steps needed to enable
+    // ENVIRONMENT_PRODUCTION.
+    public static final int PAYMENTS_ENVIRONMENT = WalletConstants.ENVIRONMENT_TEST;
+
+    // The allowed networks to be requested from the API. If the user has cards from networks not
+    // specified here in their account, these will not be offered for them to choose in the popup.
+    public static final List<Integer> SUPPORTED_NETWORKS = Arrays.asList(
+            WalletConstants.CARD_NETWORK_AMEX,
+            WalletConstants.CARD_NETWORK_DISCOVER,
+            WalletConstants.CARD_NETWORK_VISA,
+            WalletConstants.CARD_NETWORK_MASTERCARD
+    );
+
+    public static final List<Integer> SUPPORTED_METHODS = Arrays.asList(
+            // PAYMENT_METHOD_CARD returns to any card the user has stored in their Google Account.
+            WalletConstants.PAYMENT_METHOD_CARD,
+
+            // PAYMENT_METHOD_TOKENIZED_CARD refers to cards added to Android Pay, assuming Android
+            // Pay is installed.
+            // Please keep in mind cards may exist in Android Pay without being added to the Google
+            // Account.
+            WalletConstants.PAYMENT_METHOD_TOKENIZED_CARD
+    );
+
+    // Required by the API, but not visible to the user.
+    public static final String CURRENCY_CODE = "USD";
+
+    // Supported countries for shipping (use ISO 3166-1 alpha-2 country codes).
+    // Relevant only when requesting a shipping address.
+    public static final List<String> SHIPPING_SUPPORTED_COUNTRIES = Arrays.asList(
+            "US",
+            "GB"
+    );
+
+    // The name of your payment processor / gateway. Please refer to their documentation for
+    // more information.
+    public static final String GATEWAY_TOKENIZATION_NAME = "stripe";
+
+    // Custom parameters required by the processor / gateway. Please refer to your processor's
+    // documentation for more information. The number of parameters required and their names vary
+    // depending on the processor.
+    public static final List<Pair<String, String>> GATEWAY_TOKENIZATION_PARAMETERS = Arrays.asList(
+            Pair.create("stripe:version", "5"),
+            Pair.create("stripe:publishableKey", "REPLACE_ME")
+    );
+    // In many cases, your processor / gateway will only require a gatewayMerchantId.
+    //public static final List<Pair<String, String>> GATEWAY_TOKENIZATION_PARAMETERS = Arrays.asList(
+    //        Pair.create("gatewayMerchantId", "REPLACE_ME")
+    //);
+
+    // Only used for DIRECT tokenization. Can be removed when using GATEWAY tokenization.
+    public static final String DIRECT_TOKENIZATION_PUBLIC_KEY = "REPLACE_ME";
+
+    private Constants() {
+    }
+
+}

app/src/main/java/com/google/android/gms/samples/wallet/ItemInfo.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.google.android.gms.samples.wallet;
+
+/**
+ * Used for storing the (hard coded) info about the item we're selling.
+ * <p>
+ * This POJO class is used only for example purposes - you don't need need it in your code.
+ */
+public class ItemInfo {
+    private final String name;
+    private final int imageResourceId;
+
+    // Micros are used for prices to avoid rounding errors when converting between currencies.
+    private final long priceMicros;
+
+    public ItemInfo(String name, long price, int imageResourceId) {
+        this.name = name;
+        this.priceMicros = price;
+        this.imageResourceId = imageResourceId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getImageResourceId() {
+        return imageResourceId;
+    }
+
+    public long getPriceMicros() {
+        return priceMicros;
+    }
+}

app/src/main/java/com/google/android/gms/samples/wallet/PaymentsUtil.java

@@ -0,0 +1,185 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.google.android.gms.samples.wallet;
+
+import android.app.Activity;
+import android.util.Pair;
+
+import com.google.android.gms.tasks.Task;
+import com.google.android.gms.wallet.CardRequirements;
+import com.google.android.gms.wallet.IsReadyToPayRequest;
+import com.google.android.gms.wallet.PaymentDataRequest;
+import com.google.android.gms.wallet.PaymentMethodTokenizationParameters;
+import com.google.android.gms.wallet.PaymentsClient;
+import com.google.android.gms.wallet.ShippingAddressRequirements;
+import com.google.android.gms.wallet.TransactionInfo;
+import com.google.android.gms.wallet.Wallet;
+import com.google.android.gms.wallet.WalletConstants;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+/**
+ * Contains helper static methods for dealing with the Payments API.
+ * <p>
+ * Many of the parameters used in the code are optional and are set here merely to call out their
+ * existence. Please consult the documentation to learn more and feel free to remove ones not
+ * relevant to your implementation.
+ */
+public class PaymentsUtil {
+    private static final BigDecimal MICROS = new BigDecimal(1000000d);
+
+    private PaymentsUtil() {
+    }
+
+    /**
+     * Creates an instance of {@link PaymentsClient} for use in an {@link Activity} using the
+     * environment and theme set in {@link Constants}.
+     *
+     * @param activity is the caller's activity.
+     */
+    public static PaymentsClient createPaymentsClient(Activity activity) {
+        Wallet.WalletOptions walletOptions = new Wallet.WalletOptions.Builder()
+                .setEnvironment(Constants.PAYMENTS_ENVIRONMENT)
+                .build();
+        return Wallet.getPaymentsClient(activity, walletOptions);
+    }
+
+    /**
+     * Builds {@link PaymentDataRequest} to be consumed by {@link PaymentsClient#loadPaymentData}.
+     *
+     * @param transactionInfo contains the price for this transaction.
+     */
+    public static PaymentDataRequest createPaymentDataRequest(TransactionInfo transactionInfo) {
+        PaymentMethodTokenizationParameters.Builder paramsBuilder =
+                PaymentMethodTokenizationParameters.newBuilder()
+                        .setPaymentMethodTokenizationType(
+                                WalletConstants.PAYMENT_METHOD_TOKENIZATION_TYPE_PAYMENT_GATEWAY)
+                        .addParameter("gateway", Constants.GATEWAY_TOKENIZATION_NAME);
+        for (Pair<String, String> param : Constants.GATEWAY_TOKENIZATION_PARAMETERS) {
+            paramsBuilder.addParameter(param.first, param.second);
+        }
+
+        return createPaymentDataRequest(transactionInfo, paramsBuilder.build());
+    }
+
+    /**
+     * Builds {@link PaymentDataRequest} for use with DIRECT integration to be consumed by
+     * {@link PaymentsClient#loadPaymentData}.
+     * <p>
+     * Please refer to the documentation for more information about DIRECT integration. The type of
+     * integration you use depends on your payment processor.
+     *
+     * @param transactionInfo contains the price for this transaction.
+     */
+    public static PaymentDataRequest createPaymentDataRequestDirect(TransactionInfo transactionInfo) {
+        PaymentMethodTokenizationParameters params =
+                PaymentMethodTokenizationParameters.newBuilder()
+                        .setPaymentMethodTokenizationType(
+                                WalletConstants.PAYMENT_METHOD_TOKENIZATION_TYPE_DIRECT)
+
+                        // Omitting the publicKey will result in a request for unencrypted data.
+                        // Please refer to the documentation for more information on unencrypted
+                        // requests.
+                        .addParameter("publicKey", Constants.DIRECT_TOKENIZATION_PUBLIC_KEY)
+                        .build();
+
+        return createPaymentDataRequest(transactionInfo, params);
+    }
+
+    private static PaymentDataRequest createPaymentDataRequest(TransactionInfo transactionInfo, PaymentMethodTokenizationParameters params) {
+        PaymentDataRequest request =
+                PaymentDataRequest.newBuilder()
+                        .setPhoneNumberRequired(false)
+                        .setEmailRequired(true)
+                        .setShippingAddressRequired(true)
+
+                        // Omitting ShippingAddressRequirements all together means all countries are
+                        // supported.
+                        .setShippingAddressRequirements(
+                                ShippingAddressRequirements.newBuilder()
+                                        .addAllowedCountryCodes(Constants.SHIPPING_SUPPORTED_COUNTRIES)
+                                        .build())
+
+                        .setTransactionInfo(transactionInfo)
+                        .addAllowedPaymentMethods(Constants.SUPPORTED_METHODS)
+                        .setCardRequirements(
+                                CardRequirements.newBuilder()
+                                        .addAllowedCardNetworks(Constants.SUPPORTED_NETWORKS)
+                                        .setAllowPrepaidCards(true)
+                                        .setBillingAddressRequired(true)
+
+                                        // Omitting this parameter will result in the API returning
+                                        // only a "minimal" billing address (post code only).
+                                        .setBillingAddressFormat(WalletConstants.BILLING_ADDRESS_FORMAT_FULL)
+                                        .build())
+                        .setPaymentMethodTokenizationParameters(params)
+
+                        // If the UI is not required, a returning user will not be asked to select
+                        // a card. Instead, the card they previously used will be returned
+                        // automatically (if still available).
+                        // Prior whitelisting is required to use this feature.
+                        .setUiRequired(true)
+                        .build();
+
+        return request;
+    }
+
+    /**
+     * Determines if the user is eligible to Pay with Google by calling
+     * {@link PaymentsClient#isReadyToPay}. The nature of this check depends on the methods set in
+     * {@link Constants#SUPPORTED_METHODS}.
+     * <p>
+     * If {@link WalletConstants#PAYMENT_METHOD_CARD} is specified among supported methods, this
+     * function will return true even if the user has no cards stored. Please refer to the
+     * documentation for more information on how the check is performed.
+     *
+     * @param client used to send the request.
+     */
+    public static Task<Boolean> isReadyToPay(PaymentsClient client) {
+        IsReadyToPayRequest.Builder request = IsReadyToPayRequest.newBuilder();
+        for (Integer allowedMethod : Constants.SUPPORTED_METHODS) {
+            request.addAllowedPaymentMethod(allowedMethod);
+        }
+        return client.isReadyToPay(request.build());
+    }
+
+    /**
+     * Builds {@link TransactionInfo} for use with {@link PaymentsUtil#createPaymentDataRequest}.
+     * <p>
+     * The price is not displayed to the user and must be in the following format: "12.34".
+     * {@link PaymentsUtil#microsToString} can be used to format the string.
+     *
+     * @param price total of the transaction.
+     */
+    public static TransactionInfo createTransaction(String price) {
+        return TransactionInfo.newBuilder()
+                .setTotalPriceStatus(WalletConstants.TOTAL_PRICE_STATUS_FINAL)
+                .setTotalPrice(price)
+                .setCurrencyCode(Constants.CURRENCY_CODE)
+                .build();
+    }
+
+    /**
+     * Converts micros to a string format accepted by {@link PaymentsUtil#createTransaction}.
+     *
+     * @param micros value of the price.
+     */
+    public static String microsToString(long micros) {
+        return new BigDecimal(micros).divide(MICROS).setScale(2, RoundingMode.HALF_EVEN).toString();
+    }
+}

app/src/main/res/drawable-v21/pay_with_google_button_background.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="#1f000000">
+    <item>
+        <selector xmlns:android="http://schemas.android.com/apk/res/android" >
+            <item
+                android:state_enabled="false"
+                android:state_focused="true"
+                android:drawable="@drawable/pay_with_google_button_background_image_focused" />
+            <item
+                android:state_enabled="false"
+                android:drawable="@drawable/pay_with_google_button_background_image" />
+            <!-- Skipping state_pressed="true" because the ripple effect is sufficient feedback -->
+            <item
+                android:state_focused="true"
+                android:drawable="@drawable/pay_with_google_button_background_image_focused" />
+            <item
+                android:drawable="@drawable/pay_with_google_button_background_image" />
+        </selector>
+    </item>
+</ripple>
+

app/src/main/res/drawable-v21/pay_with_google_button_no_shadow_background.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="#1f000000">
+    <item>
+        <selector xmlns:android="http://schemas.android.com/apk/res/android" >
+            <item
+                android:state_enabled="false"
+                android:state_focused="true"
+                android:drawable="@drawable/pay_with_google_button_no_shadow_background_image_focused" />
+            <item
+                android:state_enabled="false"
+                android:drawable="@drawable/pay_with_google_button_no_shadow_background_image" />
+            <!-- Skipping state_pressed="true" because the ripple effect is sufficient feedback -->
+            <item
+                android:state_focused="true"
+                android:drawable="@drawable/pay_with_google_button_no_shadow_background_image_focused" />
+            <item
+                android:drawable="@drawable/pay_with_google_button_no_shadow_background_image" />
+        </selector>
+    </item>
+</ripple>
+

app/src/main/res/drawable/pay_with_google_button_background.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item
+        android:state_enabled="false"
+        android:state_focused="true"
+        android:drawable="@drawable/pay_with_google_button_background_image_focused" />
+    <item
+        android:state_enabled="false"
+        android:drawable="@drawable/pay_with_google_button_background_image" />
+    <item
+        android:state_pressed="true"
+        android:drawable="@drawable/pay_with_google_button_background_image_pressed" />
+    <item
+        android:state_focused="true"
+        android:drawable="@drawable/pay_with_google_button_background_image_focused" />
+    <item
+        android:drawable="@drawable/pay_with_google_button_background_image" />
+</selector>
+

app/src/main/res/drawable/pay_with_google_button_no_shadow_background.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item
+        android:state_enabled="false"
+        android:state_focused="true"
+        android:drawable="@drawable/pay_with_google_button_no_shadow_background_image_focused" />
+    <item
+        android:state_enabled="false"
+        android:drawable="@drawable/pay_with_google_button_no_shadow_background_image" />
+    <item
+        android:state_pressed="true"
+        android:drawable="@drawable/pay_with_google_button_no_shadow_background_image_pressed" />
+    <item
+        android:state_focused="true"
+        android:drawable="@drawable/pay_with_google_button_no_shadow_background_image_focused" />
+    <item
+        android:drawable="@drawable/pay_with_google_button_no_shadow_background_image" />
+</selector>
+

app/src/main/res/drawable/pay_with_google_button_overlay.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_enabled="false">
+        <shape
+            android:shape="rectangle" >
+            <corners android:radius="4dp"/>
+            <solid android:color="#7FFFFFFF"/>
+        </shape>
+    </item>
+    <item android:drawable="@android:color/transparent" />
+</selector>

app/src/main/res/layout/activity_checkout.xml

@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:fillViewport="true"
+    tools:context="com.google.android.gms.samples.wallet.CheckoutActivity">
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/padding_small"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/text_item_name"
+            style="@android:style/TextAppearance.Large"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="@dimen/padding_small" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="@dimen/padding_small"
+            android:minHeight="300dp"
+            android:orientation="horizontal">
+
+            <ImageView
+                android:id="@+id/image_item_image"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:adjustViewBounds="true" />
+
+            <TextView
+                android:id="@+id/text_item_price"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center_vertical"
+                android:layout_weight="1"
+                android:gravity="center_horizontal"
+                android:textStyle="bold" />
+
+        </LinearLayout>
+
+        <FrameLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_marginTop="@dimen/margin_xlarge">
+
+            <include
+                android:id="@+id/pwg_button"
+                layout="@layout/pay_with_google_button"
+                android:layout_width="@dimen/buy_button_width"
+                android:layout_height="@dimen/buy_button_height"
+                android:visibility="gone" />
+
+            <TextView
+                android:id="@+id/pwg_status"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:gravity="center"
+                android:text="@string/pwg_status_checking" />
+        </FrameLayout>
+
+    </LinearLayout>
+
+</ScrollView>

app/src/main/res/layout/pay_with_google_button.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:clickable="true"
+    android:focusable="true"
+    android:layout_width="match_parent"
+    android:layout_height="48sp"
+    android:background="@drawable/pay_with_google_button_background"
+    android:padding="4dp"
+    android:contentDescription="@string/pay_with_google_content_description">
+    <LinearLayout
+        android:duplicateParentState="true"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="2"
+        android:gravity="center_vertical"
+        android:orientation="vertical">
+        <ImageView
+            android:layout_weight="1"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:scaleType="fitCenter"
+            android:duplicateParentState="true"
+            android:src="@drawable/pay_with_google_button_content"/>
+    </LinearLayout>
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="fitXY"
+        android:duplicateParentState="true"
+        android:src="@drawable/pay_with_google_button_overlay"/>
+</RelativeLayout>

app/src/main/res/layout/pay_with_google_button_no_shadow.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:clickable="true"
+    android:focusable="true"
+    android:layout_width="match_parent"
+    android:layout_height="40sp"
+    android:background="@drawable/pay_with_google_button_no_shadow_background"
+    android:contentDescription="@string/pay_with_google_content_description">
+    <LinearLayout
+        android:duplicateParentState="true"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="2"
+        android:gravity="center_vertical"
+        android:orientation="vertical">
+        <ImageView
+            android:layout_weight="1"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:scaleType="fitCenter"
+            android:duplicateParentState="true"
+            android:src="@drawable/pay_with_google_button_content"/>
+    </LinearLayout>
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="fitXY"
+        android:duplicateParentState="true"
+        android:src="@drawable/pay_with_google_button_overlay"/>
+</RelativeLayout>

app/src/main/res/layout/pay_with_google_button_short.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:clickable="true"
+    android:focusable="true"
+    android:layout_width="match_parent"
+    android:layout_height="48sp"
+    android:background="@drawable/pay_with_google_button_background"
+    android:padding="4dp"
+    android:contentDescription="@string/pay_with_google_content_description">
+    <LinearLayout
+        android:duplicateParentState="true"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="2"
+        android:gravity="center_vertical"
+        android:orientation="vertical">
+        <ImageView
+            android:layout_weight="1"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:scaleType="fitCenter"
+            android:duplicateParentState="true"
+            android:src="@drawable/pay_with_google_button_short_content"/>
+    </LinearLayout>
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="fitXY"
+        android:duplicateParentState="true"
+        android:src="@drawable/pay_with_google_button_overlay"/>
+</RelativeLayout>

app/src/main/res/layout/pay_with_google_button_short_no_shadow.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:clickable="true"
+    android:focusable="true"
+    android:layout_width="match_parent"
+    android:layout_height="40sp"
+    android:background="@drawable/pay_with_google_button_no_shadow_background"
+    android:contentDescription="@string/pay_with_google_content_description">
+    <LinearLayout
+        android:duplicateParentState="true"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="2"
+        android:gravity="center_vertical"
+        android:orientation="vertical">
+        <ImageView
+            android:layout_weight="1"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:scaleType="fitCenter"
+            android:duplicateParentState="true"
+            android:src="@drawable/pay_with_google_button_short_content"/>
+    </LinearLayout>
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="fitXY"
+        android:duplicateParentState="true"
+        android:src="@drawable/pay_with_google_button_overlay"/>
+</RelativeLayout>

app/src/main/res/values/dimens.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<resources>
+
+    <dimen name="padding_small">5dp</dimen>
+    <dimen name="margin_large">10dp</dimen>
+    <dimen name="margin_xlarge">30dp</dimen>
+
+    <dimen name="buy_button_width">300dp</dimen>
+    <dimen name="buy_button_height">48sp</dimen>
+    <dimen name="buy_button_min_width">200dp</dimen>
+
+</resources>

app/src/main/res/values/pay_with_google_strings.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<resources>
+    <string name="pay_with_google_content_description">Pay with Google</string>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) Google
+
+     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.
+-->
+
+<resources>
+    <string name="app_name">My Online Store App</string>
+    <string name="store_name">My Online Store</string>
+    <string name="pwg_status_unavailable">Unfortunately, Pay with Google is not available on this phone.</string>
+    <string name="pwg_status_checking">Checking if Pay with Google is available...</string>
+    <string name="payments_show_name">Successfully received payment data for %s!</string>
+</resources>

build.gradle

@@ -0,0 +1,25 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.3.3'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+        mavenLocal()
+        maven { url 'https://maven.google.com'  }
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

@@ -0,0 +1,17 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Fri Sep 08 11:03:33 BST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

gradlew

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+include ':app'