[in_app_purchase] Android example using in_app_purchase_android package

packages/in_app_purchase/in_app_purchase/example/README.md

@@ -32,7 +32,7 @@ below.
    - `subscription_silver`: A lower level subscription.
    - `subscription_gold`: A higher level subscription.
 
-   Make sure that all of the products are set to `ACTIVE`.
+   Make sure that all the products are set to `ACTIVE`.
 
 4. Update `APP_ID` in `example/android/app/build.gradle` to match your package
    ID in the PDC.

packages/in_app_purchase/in_app_purchase_android/example/README.md

@@ -0,0 +1,58 @@
+# In App Purchase Example
+
+Demonstrates how to use the In App Purchase Android (IAP) Plugin.
+
+## Getting Started
+
+### Preparation
+
+There's a significant amount of setup required for testing in-app purchases
+successfully, including registering new app IDs and store entries to use for
+testing in the Play Developer Console. Google Play requires developers to 
+configure an app with in-app items for purchase to call their in-app-purchase 
+APIs. The Google Play Store has extensive documentation on how to do this, and 
+we've also included a high level guide below.
+
+* [Google Play Billing Overview](https://developer.android.com/google/play/billing/billing_overview)
+
+### Android
+
+1. Create a new app in the [Play Developer
+   Console](https://play.google.com/apps/publish/) (PDC).
+
+2. Sign up for a merchant's account in the PDC.
+
+3. Create IAPs in the PDC available for purchase in the app. The example assumes
+   the following SKU IDs exist:
+
+   - `consumable`: A managed product.
+   - `upgrade`: A managed product.
+   - `subscription_silver`: A lower level subscription.
+   - `subscription_gold`: A higher level subscription.
+
+   Make sure that all of the products are set to `ACTIVE`.
+
+4. Update `APP_ID` in `example/android/app/build.gradle` to match your package
+   ID in the PDC.
+
+5. Create an `example/android/keystore.properties` file with all your signing
+   information. `keystore.example.properties` exists as an example to follow.
+   It's impossible to use any of the `BillingClient` APIs from an unsigned APK.
+   See
+   [here](https://developer.android.com/studio/publish/app-signing#secure-shared-keystore)
+   and [here](https://developer.android.com/studio/publish/app-signing#sign-apk)
+   for more information.
+
+6. Build a signed apk. `flutter build apk` will work for this, the gradle files
+   in this project have been configured to sign even debug builds.
+
+7. Upload the signed APK from step 6 to the PDC, and publish that to the alpha
+   test channel. Add your test account as an approved tester. The
+   `BillingClient` APIs won't work unless the app has been fully published to
+   the alpha channel and is being used by an authorized test account. See
+   [here](https://support.google.com/googleplay/android-developer/answer/3131213)
+   for more info.
+
+8. Sign in to the test device with the test account from step #7. Then use
+   `flutter run` to install the app to the device and test like normal.
+

packages/in_app_purchase/in_app_purchase_android/example/android/app/build.gradle

@@ -0,0 +1,115 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+// Load the build signing secrets from a local `keystore.properties` file.
+// TODO(YOU): Create release keys and a `keystore.properties` file. See
+// `example/README.md` for more info and `keystore.example.properties` for an
+// example.
+def keystorePropertiesFile = rootProject.file("keystore.properties")
+def keystoreProperties = new Properties()
+def configured = true
+try {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+} catch (IOException e) {
+    configured = false
+    logger.error('Release signing information not found.')
+}
+
+project.ext {
+    // TODO(YOU): Create release keys and a `keystore.properties` file. See
+    // `example/README.md` for more info and `keystore.example.properties` for an
+    // example.
+    APP_ID = configured ? keystoreProperties['appId'] : "io.flutter.plugins.inapppurchaseexample.DEFAULT_DO_NOT_USE"
+    KEYSTORE_STORE_FILE = configured ? rootProject.file(keystoreProperties['storeFile']) : null
+    KEYSTORE_STORE_PASSWORD = keystoreProperties['storePassword']
+    KEYSTORE_KEY_ALIAS = keystoreProperties['keyAlias']
+    KEYSTORE_KEY_PASSWORD = keystoreProperties['keyPassword']
+    VERSION_CODE = configured ? keystoreProperties['versionCode'].toInteger() : 1
+    VERSION_NAME = configured ? keystoreProperties['versionName'] : "0.0.1"
+}
+
+if (project.APP_ID == "io.flutter.plugins.inapppurchaseexample.DEFAULT_DO_NOT_USE") {
+    configured = false
+    logger.error('Unique package name not set, defaulting to "io.flutter.plugins.inapppurchaseexample.DEFAULT_DO_NOT_USE".')
+}
+
+// Log a final error message if we're unable to create a release key signed
+// build for an app configured in the Play Developer Console. Apks built in this
+// condition won't be able to call any of the BillingClient APIs.
+if (!configured) {
+    logger.error('The app could not be configured for release signing. In app purchases will not be testable. See `example/README.md` for more info and instructions.')
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    signingConfigs {
+        release {
+            storeFile project.KEYSTORE_STORE_FILE
+            storePassword project.KEYSTORE_STORE_PASSWORD
+            keyAlias project.KEYSTORE_KEY_ALIAS
+            keyPassword project.KEYSTORE_KEY_PASSWORD
+        }
+    }
+
+    compileSdkVersion 29
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        applicationId project.APP_ID
+        minSdkVersion 16
+        targetSdkVersion 29
+        versionCode project.VERSION_CODE
+        versionName project.VERSION_NAME
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        // Google Play Billing APIs only work with apps signed for production.
+        debug {
+            if (configured) {
+                signingConfig signingConfigs.release
+            } else {
+                signingConfig signingConfigs.debug
+            }
+        }
+        release {
+            if (configured) {
+                signingConfig signingConfigs.release
+            } else {
+                signingConfig signingConfigs.debug
+            }
+        }
+    }
+
+    testOptions {
+        unitTests.returnDefaultValues = true
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation 'com.android.billingclient:billing:3.0.2'
+    testImplementation 'junit:junit:4.12'
+    testImplementation 'org.mockito:mockito-core:3.6.0'
+    testImplementation 'org.json:json:20180813'
+    androidTestImplementation 'androidx.test:runner:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+}

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

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

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

@@ -0,0 +1,48 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.flutter.plugins.inapppurchaseexample">
+
+    <!-- The INTERNET permission is required for development. Specifically,
+         flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="in_app_purchase_example"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".EmbeddingV1Activity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
+            android:hardwareAccelerated="true"
+            android:exported="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- This keeps the window background of the activity showing
+                 until Flutter renders its first frame. It can be removed if
+                 there is no splash screen (such as the default splash screen
+                 defined in @style/LaunchTheme). -->
+            <meta-data
+                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
+                android:value="true" />
+        </activity>
+        <activity
+            android:name="io.flutter.embedding.android.FlutterActivity"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <meta-data android:name="flutterEmbedding" android:value="2"/>
+    </application>
+</manifest>

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/main/java/io/flutter/plugins/inapppurchaseexample/EmbeddingV1Activity.java

@@ -0,0 +1,24 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.inapppurchaseexample;
+
+import android.os.Bundle;
+import dev.flutter.plugins.integration_test.IntegrationTestPlugin;
+import io.flutter.plugins.inapppurchase.InAppPurchasePlugin;
+import io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin;
+
+@SuppressWarnings("deprecation")
+public class EmbeddingV1Activity extends io.flutter.app.FlutterActivity {
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    IntegrationTestPlugin.registerWith(
+        registrarFor("dev.flutter.plugins.integration_test.IntegrationTestPlugin"));
+    SharedPreferencesPlugin.registerWith(
+        registrarFor("io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin"));
+    InAppPurchasePlugin.registerWith(
+        registrarFor("io.flutter.plugins.inapppurchase.InAppPurchasePlugin"));
+  }
+}

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/main/java/io/flutter/plugins/inapppurchaseexample/EmbeddingV1ActivityTest.java

@@ -0,0 +1,18 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.inapppurchaseexample;
+
+import androidx.test.rule.ActivityTestRule;
+import dev.flutter.plugins.integration_test.FlutterTestRunner;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+
+@RunWith(FlutterTestRunner.class)
+@SuppressWarnings("deprecation")
+public class EmbeddingV1ActivityTest {
+  @Rule
+  public ActivityTestRule<EmbeddingV1Activity> rule =
+      new ActivityTestRule<>(EmbeddingV1Activity.class);
+}

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/main/java/io/flutter/plugins/inapppurchaseexample/FlutterActivityTest.java

@@ -0,0 +1,17 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.inapppurchaseexample;
+
+import androidx.test.rule.ActivityTestRule;
+import dev.flutter.plugins.integration_test.FlutterTestRunner;
+import io.flutter.embedding.android.FlutterActivity;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+
+@RunWith(FlutterTestRunner.class)
+public class FlutterActivityTest {
+  @Rule
+  public ActivityTestRule<FlutterActivity> rule = new ActivityTestRule<>(FlutterActivity.class);
+}

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+</resources>

packages/in_app_purchase/in_app_purchase_android/example/android/app/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker

@@ -0,0 +1 @@
+mock-maker-inline

packages/in_app_purchase/in_app_purchase_android/example/android/build.gradle

@@ -0,0 +1,29 @@
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.3.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

packages/in_app_purchase/in_app_purchase_android/example/android/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true

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

@@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

packages/in_app_purchase/in_app_purchase_android/example/android/keystore.example.properties

@@ -0,0 +1,7 @@
+storePassword=???
+keyPassword=???
+keyAlias=???
+storeFile=???
+appId=io.flutter.plugins.inapppurchaseexample.DEFAULT_DO_NOT_USE
+versionCode=1
+versionName=0.0.1

packages/in_app_purchase/in_app_purchase_android/example/android/settings.gradle

@@ -0,0 +1,15 @@
+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}