Native plugin setup replaces the standard Monetizr Unity plugin library with its Android library. It allows using Google Pay within mobile Unity games.

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Requires Android Studio. Tested with Unity 2017.2.5f1 and Unity 2019.3.0f3.

The Android project structure has slight differences between various Unity versions, but the workflow remains largely the same.

Enable the native plugin

In the Monetizr settings window (Window > Monetizr Settings) enable Android native plugin. This will enable ShowProductForTag calls to call the native Android plugin on builds.

Export your project

In order to add the Monetizr Android plugin to your project, you will have to perform a few additional steps each time you wish to make a build of your application.

Your application needs to be exported into Android project that can be opened with Android Studio. You can do that from the Build Settings window.

Open the project with Android Studio

Open the exported project with Android Studio. Upon opening, you might see this message - click OK.

Make the necessary file changes

The Unity Android build process has been changing over time. These instructions assume that the current MonetizrSDK version is 2.1.0, however a newer version may be available - you can check here

For Unity 2019 project

1. Edit the build.gradle file found in the unityLibrary module. To the dependencies section add these dependencies:

implementation 'io.monetizr.monetizrsdk:MonetizrSDK:2.1.0'
implementation 'androidx.appcompat:appcompat:1.1.0'

In all build.gradle files If minSdkVersion is less than 26, change it to minSdkVersion 26.

2. Edit the project-wide build.gradle file. Add another repository from which to get dependencies. In the allprojects -> repositories section add mavenCentral(). It should end up similar to this:

repositories {
        google()
        mavenCentral()
        jcenter()
        flatDir {
            dirs "${project(':unityLibrary').projectDir}/libs"
        }
}

In the android block add this block (note - this may no longer be required since Unity 2019.4):

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

After these steps, Gradle sync will be successful, however, the project still won't build.

3. Edit the gradle.properties file. Add the following:

android.useAndroidX=true
android.enableJetifier=true

After this step, the build will be successful, however, there is still one last step.

4. Edit the AndroidManifest.xml file found in the unityLibrary module. In the <activity> tag, change the value for property android:theme to @style/Theme.AppCompat.DayNight.

As per the Android plugin setup instructions add a new meta-data entry for your access token.

<meta-data android:name="monetizr_api_key" android:value="4D2E54389EB489966658DDD83E2D1"/>

5. Congratulations, the native plugin is up and running!

For Unity 2017 project

1. Edit the gradle-wrapper.properties file. Make sure the distributionUrl line corresponds to this:

distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip

2. Edit the build.gradle file. In the buildscript -> dependencies section change the build:gradle entry to this:

classpath 'com.android.tools.build:gradle:3.4.0'

Moving lower in the file after the apply-plugin line add this:

repositories {
    google()
    mavenCentral()
    jcenter()
}

Also, add these repositories to the buildscript block on top of the file.

To the dependencies section that is not within buildscript block add these dependencies:

implementation 'io.monetizr.monetizrsdk:MonetizrSDK:2.1.0'
implementation 'androidx.appcompat:appcompat:1.1.0'

In the android block add this block:

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

Finally, increase the minSdkVersion to at least 26

3. Perform a Gradle sync - you should receive an error. Android Studio will offer you a fix for this error (Move minSdkVersion to build file and sync project) - perform the fix. At this point, the Gradle sync should be successful.

4. Edit the gradle.properties file. Add the following:

android.useAndroidX=true
android.enableJetifier=true

After this step, the build will be successful, however, there is still one last step.

5. Edit the project's AndroidManifest.xml file. In the <application> tag, change the value for property android:theme to @style/Theme.AppCompat.DayNight.

As per the Android plugin setup instructions add a new meta-data entry for your access token.

<meta-data android:name="monetizr_api_key" android:value="4D2E54389EB489966658DDD83E2D1"/>

6. Congratulations, the native plugin is up and running!

If you are experiencing issues with installing the APK on your device try reducing the targetSdkVersion, and respectively - compileSdkVersion and buildToolsVersion.