APK built with OpenCV Mobile 4.12.0 does not support 16 KB memory page size devices

[namanh11611]

We are experiencing a critical deployment issue where the Android application, which integrates the OpenCV Mobile SDK version 4.12.0, is not compatible with devices using a 16 KB memory page size.

As per Google's requirement, starting November 1st, 2025, all new apps and updates to existing apps submitted to Google Play and targeting Android 15+ devices must support 16 KB page sizes on 64-bit devices.

Follow these steps to reproduce the issue:

1. Create a new Android project using Android Studio Narwhal 3 Feature Drop | 2025.1.3.
2. Configure the project with the following versions:

• AGP Version: 8.13.0
• Kotlin Version: 2.0.21
• NDK Version: 28
• CMake Version: 3.22.1

3. Integrate the opencv-mobile-4.12.0-android into the project.
4. Build the APK.
5. Analyze APK.

Expected Behavior
The APK built with OpenCV Mobile 4.12.0 should fully support 16 KB memory page size devices.

[dosubot]

Hi @namanh11611! I'm Dosu and I’m helping the opencv-mobile team.

OpenCV Mobile 4.12.0 does not support 16 KB memory page size alignment for Android, which is why your APK's native libraries are misaligned and incompatible with Android 15+ devices requiring this support. This limitation is due to missing build configuration for flexible page sizes in that version—there are no relevant CMake flags or linker options in 4.12.0 to ensure ELF segment alignment for 16 KB pages.

Support for 16 KB page size was added after 4.12.0. Specifically, PRs #175 and #178 introduced the -DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON CMake option to the Android build workflow, which enables the required alignment for 16 KB pages.

The recommended solution is to upgrade to a newer version of OpenCV Mobile that includes these changes. If you must use 4.12.0, you would need to manually rebuild the native libraries with the necessary linker flags (such as -z max-page-size=0x4000) and CMake options, following the approach in those PRs. There is currently no official documentation for enabling this in 4.12.0, so you would need to adapt the build scripts accordingly.

After rebuilding, test your APK in a 16 KB page size emulator or device to ensure compatibility, as required by Google's upcoming policy.

To reply, just mention @dosu.

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[namanh11611]

Hi @dosu

I see that PRs #175 and #178 were merged into the master branch on December 26, 2024, which means they should have been included in version 4.12.0. Why isn't it working?

[dosubot]

PRs #175 and #178 were merged after the 4.12.0 release was tagged, so their changes—including 16 KB page size support—are not present in 4.12.0 or any published release. Releases are typically created from a specific commit, and any PRs merged after that point only appear in future releases. There is currently no newer official release with these changes; to get 16 KB support, you’ll need to build from the latest source on master or wait for the next release that includes those PRs. You can verify which commits are included in a release by comparing the release tag to the PR merge commits in the repository history.
Source 1 | Source 2

To reply, just mention @dosu.

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[namanh11611]

I added this flag into my build.gradle.kts file, and it works.

android {
  defaultConfig {
    externalNativeBuild {
      cmake {
        arguments += listOf("-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON")
      }
    }
  }
}

Thank you!