Import * .so into android module

I'm trying to import a lib *.so into a module I'm trying to build. Importing directly into apk works perfectly, but when I add in the module, not.

The error returned is:

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.stapeapp.demo_stape_sdk, PID: 12855
              java.lang.UnsatisfiedLinkError: No implementation found for void com.stapeapp.demo_stape_sdk.teste.native_init() (tried Java_com_stapeapp_demo_1stape_1sdk_teste_native_1init and Java_com_stapeapp_demo_1stape_1sdk_teste_native_1init__)
                  at com.stapeapp.demo_stape_sdk.teste.native_init(Native Method)
                  at com.stapeapp.demo_stape_sdk.teste.<clinit>(teste.java:12)
                  at com.stapeapp.demo_stape_sdk.teste.generateFingerPrint(teste.java)
                  at com.stapeapp.demo_stape_sdk.MainActivity.onCreate(MainActivity.java:60)
                  at android.app.Activity.performCreate(Activity.java:6112)
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1117)
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2609)
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2721)
                  at android.app.ActivityThread.access$900(ActivityThread.java:168)
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:135)
                  at android.app.ActivityThread.main(ActivityThread.java:5753)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at java.lang.reflect.Method.invoke(Method.java:372)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

Gradle of apk :

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.stapeapp.demo_stape_sdk"
        minSdkVersion 21
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        ndk {
            abiFilters "armeabi", "armeabi-v7a", "x86", "mips"
        }

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        targetCompatibility 1.8
        sourceCompatibility 1.8
    }

    sourceSets {
        main {
            jniLibs.srcDirs = ["src/main/jniLibs"]
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.android.support:design:27.1.1'

    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    implementation project(path: ':stape-sdk')
}

Gradle module :

android {
    compileSdkVersion 27

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        ndk {
            abiFilters "armeabi", "armeabi-v7a", "x86", "mips"
        }

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        targetCompatibility 1.8
        sourceCompatibility 1.8
    }

    sourceSets {
        main {
            jniLibs.srcDirs = ["libs"]
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'org.androidannotations:androidannotations-api:3.0.1'
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.kailashdabhi:om-recorder:1.1.5'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    androidTestImplementation "com.android.support:support-annotations:27.1.1"
}

Where is my error?