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[in_app_purchase] Federated Android implementation (#3841)
* Implement BillingClientWrapper and unit-tests * Android specific implementation * Moved Android specific methods into addition class * Added missing line end * Purchases status to restored after call restorePurchases * Don't force GooglePlayPurchaseParam * Implement registerPlatform method * Added TODO comment to add example * Fixed mistake in API documentation * Added additional assert to test enablePendingPurchase * Update Android implementation with latest platform_interface
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‎packages/in_app_purchase/in_app_purchase_android/CHANGELOG.md

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## 0.1.0
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* Initial open-source release.

‎packages/in_app_purchase/in_app_purchase_android/LICENSE

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Copyright 2013 The Flutter Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

‎packages/in_app_purchase/in_app_purchase_android/README.md

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# in_app_purchase_android
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The Android implementation of [`in_app_purchase`][1].
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## Usage
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### Import the package
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This package has been endorsed, meaning that you only need to add `in_app_purchase`
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as a dependency in your `pubspec.yaml`. It will be automatically included in your app
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when you depend on `package:in_app_purchase`.
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This is what the above means to your `pubspec.yaml`:
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```yaml
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...
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dependencies:
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...
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in_app_purchase: ^0.6.0
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...
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```
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If you wish to use the Android package only, you can add `in_app_purchase_android` as a
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dependency:
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```yaml
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...
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dependencies:
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...
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in_app_purchase_android: ^1.0.0
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...
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```
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## TODO
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- [ ] Add an example application demonstrating the use of the [in_app_purchase_android] package (see also issue [flutter/flutter#81695](https://github.com/flutter/flutter/issues/81695)).
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[1]: ../in_app_purchase/in_app_purchase

‎packages/in_app_purchase/in_app_purchase_android/analysis_options.yaml

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include: ../../../analysis_options_legacy.yaml

‎packages/in_app_purchase/in_app_purchase_android/android/build.gradle

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group 'io.flutter.plugins.inapppurchase'
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version '1.0-SNAPSHOT'
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buildscript {
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repositories {
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google()
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jcenter()
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}
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dependencies {
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classpath 'com.android.tools.build:gradle:3.3.0'
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}
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}
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rootProject.allprojects {
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repositories {
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google()
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jcenter()
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}
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}
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apply plugin: 'com.android.library'
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android {
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compileSdkVersion 29
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defaultConfig {
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minSdkVersion 16
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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lintOptions {
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disable 'InvalidPackage'
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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}
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dependencies {
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implementation 'androidx.annotation:annotation:1.0.0'
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implementation 'com.android.billingclient:billing:3.0.2'
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testImplementation 'junit:junit:4.12'
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testImplementation 'org.json:json:20180813'
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testImplementation 'org.mockito:mockito-core:3.6.0'
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androidTestImplementation 'androidx.test:runner:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
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}

‎packages/in_app_purchase/in_app_purchase_android/android/gradle.properties

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org.gradle.jvmargs=-Xmx1536M

‎packages/in_app_purchase/in_app_purchase_android/android/gradle/wrapper/gradle-wrapper.properties

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#Mon Oct 29 10:30:44 PDT 2018
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip

‎packages/in_app_purchase/in_app_purchase_android/android/settings.gradle

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rootProject.name = 'in_app_purchase'

‎packages/in_app_purchase/in_app_purchase_android/android/src/main/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="io.flutter.plugins.inapppurchase">
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</manifest>

‎packages/in_app_purchase/in_app_purchase_android/android/src/main/java/io/flutter/plugins/inapppurchase/BillingClientFactory.java

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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package io.flutter.plugins.inapppurchase;
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import android.content.Context;
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import androidx.annotation.NonNull;
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import com.android.billingclient.api.BillingClient;
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import io.flutter.plugin.common.MethodChannel;
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/** Responsible for creating a {@link BillingClient} object. */
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interface BillingClientFactory {
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/**
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* Creates and returns a {@link BillingClient}.
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*
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* @param context The context used to create the {@link BillingClient}.
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* @param channel The method channel used to create the {@link BillingClient}.
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* @param enablePendingPurchases Whether to enable pending purchases. Throws an exception if it is
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* false.
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* @return The {@link BillingClient} object that is created.
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*/
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BillingClient createBillingClient(
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@NonNull Context context, @NonNull MethodChannel channel, boolean enablePendingPurchases);
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}

‎packages/in_app_purchase/in_app_purchase_android/android/src/main/java/io/flutter/plugins/inapppurchase/BillingClientFactoryImpl.java

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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package io.flutter.plugins.inapppurchase;
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import android.content.Context;
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import com.android.billingclient.api.BillingClient;
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import io.flutter.plugin.common.MethodChannel;
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/** The implementation for {@link BillingClientFactory} for the plugin. */
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final class BillingClientFactoryImpl implements BillingClientFactory {
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@Override
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public BillingClient createBillingClient(
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Context context, MethodChannel channel, boolean enablePendingPurchases) {
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BillingClient.Builder builder = BillingClient.newBuilder(context);
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if (enablePendingPurchases) {
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builder.enablePendingPurchases();
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}
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return builder.setListener(new PluginPurchaseListener(channel)).build();
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}
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}

‎packages/in_app_purchase/in_app_purchase_android/android/src/main/java/io/flutter/plugins/inapppurchase/InAppPurchasePlugin.java

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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package io.flutter.plugins.inapppurchase;
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import android.app.Activity;
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import android.app.Application;
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import android.content.Context;
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import androidx.annotation.VisibleForTesting;
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import com.android.billingclient.api.BillingClient;
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import io.flutter.embedding.engine.plugins.FlutterPlugin;
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import io.flutter.embedding.engine.plugins.activity.ActivityAware;
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import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
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import io.flutter.plugin.common.BinaryMessenger;
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import io.flutter.plugin.common.MethodChannel;
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/** Wraps a {@link BillingClient} instance and responds to Dart calls for it. */
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public class InAppPurchasePlugin implements FlutterPlugin, ActivityAware {
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@VisibleForTesting
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static final class MethodNames {
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static final String IS_READY = "BillingClient#isReady()";
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static final String START_CONNECTION =
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"BillingClient#startConnection(BillingClientStateListener)";
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static final String END_CONNECTION = "BillingClient#endConnection()";
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static final String ON_DISCONNECT = "BillingClientStateListener#onBillingServiceDisconnected()";
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static final String QUERY_SKU_DETAILS =
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"BillingClient#querySkuDetailsAsync(SkuDetailsParams, SkuDetailsResponseListener)";
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static final String LAUNCH_BILLING_FLOW =
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"BillingClient#launchBillingFlow(Activity, BillingFlowParams)";
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static final String ON_PURCHASES_UPDATED =
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"PurchasesUpdatedListener#onPurchasesUpdated(int, List<Purchase>)";
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static final String QUERY_PURCHASES = "BillingClient#queryPurchases(String)";
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static final String QUERY_PURCHASE_HISTORY_ASYNC =
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"BillingClient#queryPurchaseHistoryAsync(String, PurchaseHistoryResponseListener)";
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static final String CONSUME_PURCHASE_ASYNC =
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"BillingClient#consumeAsync(String, ConsumeResponseListener)";
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static final String ACKNOWLEDGE_PURCHASE =
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"BillingClient#(AcknowledgePurchaseParams params, (AcknowledgePurchaseParams, AcknowledgePurchaseResponseListener)";
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private MethodNames() {};
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}
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private MethodChannel methodChannel;
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private MethodCallHandlerImpl methodCallHandler;
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/** Plugin registration. */
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@SuppressWarnings("deprecation")
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public static void registerWith(io.flutter.plugin.common.PluginRegistry.Registrar registrar) {
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InAppPurchasePlugin plugin = new InAppPurchasePlugin();
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plugin.setupMethodChannel(registrar.activity(), registrar.messenger(), registrar.context());
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((Application) registrar.context().getApplicationContext())
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.registerActivityLifecycleCallbacks(plugin.methodCallHandler);
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}
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@Override
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public void onAttachedToEngine(FlutterPlugin.FlutterPluginBinding binding) {
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setupMethodChannel(
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/*activity=*/ null, binding.getBinaryMessenger(), binding.getApplicationContext());
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}
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@Override
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public void onDetachedFromEngine(FlutterPlugin.FlutterPluginBinding binding) {
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teardownMethodChannel();
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}
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@Override
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public void onAttachedToActivity(ActivityPluginBinding binding) {
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methodCallHandler.setActivity(binding.getActivity());
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}
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@Override
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public void onDetachedFromActivity() {
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methodCallHandler.setActivity(null);
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methodCallHandler.onDetachedFromActivity();
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}
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@Override
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public void onReattachedToActivityForConfigChanges(ActivityPluginBinding binding) {
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onAttachedToActivity(binding);
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}
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@Override
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public void onDetachedFromActivityForConfigChanges() {
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methodCallHandler.setActivity(null);
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}
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private void setupMethodChannel(Activity activity, BinaryMessenger messenger, Context context) {
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methodChannel = new MethodChannel(messenger, "plugins.flutter.io/in_app_purchase");
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methodCallHandler =
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new MethodCallHandlerImpl(activity, context, methodChannel, new BillingClientFactoryImpl());
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methodChannel.setMethodCallHandler(methodCallHandler);
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}
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private void teardownMethodChannel() {
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methodChannel.setMethodCallHandler(null);
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methodChannel = null;
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methodCallHandler = null;
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}
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@VisibleForTesting
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void setMethodCallHandler(MethodCallHandlerImpl methodCallHandler) {
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this.methodCallHandler = methodCallHandler;
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}
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}

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