[Android] Support 16KB Page Size

[mhdjazmati]

Describe the bug

final img = await cv.imreadAsync(imagePath, flags: cv.IMREAD_GRAYSCALE);

when it goes here it will crash with exception:

Unhandled Exception: Invalid argument(s): Failed to load dynamic library 'libdartcv.so': dlopen failed: empty/missing DT_HASH/DT_GNU_HASH in "/data/app/~~6THc7nmbhNWQ1qGf0VwAkQ==/com.example.opencv_oc-Rn_I_jOHmr7ZXoEHurFG1Q==/base.apk!/lib/arm64-v8a/libdartcv.so" (new hash type from the future?)

keep in mind this is my arm64-v8a folder: libavcodec.so libavformat.so
libswresample.so libavfilter.so
libavutil.so
libswscale.so

also when i try to run the command: _dart run opencvdart:setup android -a arm64-v8a -f i got error : Could not find bin/setup.dart in package opencv_dart.

keep in mind on MacOS platform it is working

To Reproduce Steps to reproduce the behavior: just make new project add lib to pubspec, run with the example code.

Desktop (please complete the following information):

• OS: android

Smartphone (please complete the following information):

• Device: emulator
• ABI Version arm64-v8a

[rainyl]

@mhdjazmati I can't reproduce it with Android API level 34, are you using Android 35?

also when i try to run the command: dart run opencv_dart:setup android -a arm64-v8a -f i got error : Could not find bin/setup.dart in package opencv_dart.

Since v1.3.0, the setup commands have been deprecated, because the libdartcv will be build locally.

Also, it would be helpful if you can attach the compiled libdartcv.so, you can find it in build/app/intermediates/stripped_native_libs/debug/out/lib/arm64-v8a

Related:

• https://github.com/android/ndk/issues/1866

[mhdjazmati]

android {
    namespace = "com.example.opencv_oc"
    compileSdk = flutter.compileSdkVersion
    ndkVersion "25.1.8937393"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }

    kotlinOptions {
        jvmTarget = 17
    }

    defaultConfig {
        minSdk = 26
        targetSdk = 34
        versionCode = flutter.versionCode
        versionName = flutter.versionName
        applicationId = "com.example.opencv_oc"
    }

    buildTypes {
        release {
            signingConfig = signingConfigs.debug
        }
    }
}

this is the size of it for it and i attached it as zip [Uploading libdartcv.so.zip…]()

[mhdjazmati]

also my emulator api is 35

[mhdjazmati]

is this the issue ? the emulator?

[rainyl]

is this the issue ? the emulator?

Very likely, there are many similiar issues about 16KB page size:

• https://github.com/opencv/opencv/issues/26027
• https://github.com/realm/realm-java/issues/7894

[rainyl]

I have reproduced the bug using API 35 with 16KB page size, will look into and try to fix it.

For now, please use emulators without 16KB Page Size