Comprehensive Guide to AD_ID Permission Declaration in Android 13: Automatic Handling by AdMob SDK

As Android platforms continue to strengthen user privacy protections, Google announced significant policy changes regarding Advertising ID in 2022. According to the latest requirements, starting with Android 13, applications must explicitly declare the AD_ID permission; otherwise, attempts to access the advertising identifier will return a string of zeros. This change directly affects all Android applications that utilize advertising identifiers, requiring developers to promptly adjust their application configurations to ensure proper functionality.

Automatic Permission Declaration Mechanism in AdMob SDK

For developers using Google Mobile Ads SDK (AdMob), the latest versions offer a convenient solution. When an application integrates AdMob SDK version 20.4.0 or higher, the SDK automatically declares the required AD_ID permission during the build process. This automated handling significantly simplifies developer configuration work and prevents potential errors from manual declarations.

The implementation principle works as follows: AdMob SDK predefines permission declarations in its AndroidManifest.xml file. During application builds, the Gradle build system automatically merges these declarations through the manifest merge functionality. This means developers don't need to add any additional permission configurations in their main AndroidManifest.xml file—the SDK handles this process automatically.

// Example permission declaration in AdMob SDK's internal AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="com.google.android.gms.permission.AD_ID"/>
</manifest>

Configuration Strategies for Different Application Scenarios

Although AdMob SDK provides automatic handling, developers still need to adopt appropriate configuration strategies based on their application's specific circumstances. The following analysis covers several common scenarios:

Scenario 1: Applications with Advertising Functionality

For applications using AdMob to display advertisements, ensuring the SDK version is 20.4.0 or higher represents best practice. Developers should declare the latest version through Gradle dependencies:

// Dependency configuration in build.gradle file
dependencies {
    implementation 'com.google.android.gms:play-services-ads:22.0.0'
}

After updating the SDK, no AD_ID-related configurations need to be added to AndroidManifest.xml. The build system automatically handles permission merging, ensuring the application properly obtains advertising identifiers on Android 13 and above.

Scenario 2: Applications Without Any Advertising

For applications that don't use any advertising functionality, even if they integrate third-party libraries that might request AD_ID permission, this permission declaration should be explicitly prevented. This can be achieved using the tools:node="remove" attribute in AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.myapp">
    
    <uses-permission android:name="com.google.android.gms.permission.AD_ID" tools:node="remove"/>
</manifest>

This configuration ensures that even if dependent libraries declare AD_ID permission, the build system will remove it during final merging, avoiding unnecessary permission requests.

Scenario 3: Using Analytics Tools Like Firebase Analytics

For applications using Firebase Analytics solely for crash reporting and application analytics, the situation is more nuanced. Firebase Analytics might attempt to access advertising identifiers by default, but developers can configure the application not to use advertising IDs in the Firebase console.

Specific steps include: In the Firebase console's project settings, locate the "Data Collection" section and disable advertising identifier usage. Simultaneously, AndroidManifest.xml should still be configured as for ad-free applications, using tools:node="remove" to explicitly remove AD_ID permission declarations.

Technical Implementation Details and Best Practices

Understanding the manifest merge mechanism is crucial for properly handling AD_ID permissions. During compilation, the Android build system collects AndroidManifest.xml files from all modules, including the main application module, library modules, and dependencies, then merges them into a final manifest file.

When multiple modules declare the same permission, merging rules apply as follows:

• If the main application module uses tools:node="remove", the permission is removed from the final manifest
• If dependent libraries declare the permission and the main application doesn't handle it, the permission is included in the final manifest
• AdMob SDK's automatic declaration falls into the second category, but only works when the SDK version is sufficiently recent

Best practice recommendations:

1. Regularly update AdMob SDK to the latest version to ensure automatic permission declaration functions correctly
2. For ad-free applications, always explicitly remove AD_ID permission declarations
3. Properly configure data collection settings for analytics tools in the Firebase console
4. Test application behavior across different Android versions to ensure correct permission configuration
5. Monitor updates to Google's official documentation to stay informed about policy changes

Compliance and Privacy Considerations

The changes to AD_ID permission declaration represent an important step in Android platforms strengthening user privacy protections. Developers need to pay special attention to the following compliance requirements:

First, if an application's target audience includes children, strict adherence to regulations like the Children's Online Privacy Protection Act (COPPA) is mandatory. This means Android Advertising Identifiers (AAID) cannot be transmitted from child users or users of unknown age.

Second, when users choose to delete their advertising identifier to opt out of personalized advertising, applications will receive a string of zeros instead of the actual identifier. Developers must ensure their applications properly handle this situation to prevent functional abnormalities due to invalid identifiers.

Finally, although AdMob SDK provides automatic handling mechanisms, developers remain responsible for their application's final permission declarations. It's recommended to carefully examine the AndroidManifest.xml in generated APK or AAB files before release, confirming that AD_ID permission declaration status aligns with expectations.

By properly configuring AD_ID permissions, developers can not only ensure normal application functionality but also demonstrate respect for user privacy—particularly important in today's data protection-conscious environment.