Azure spatial anchors integration issues. Missing NativeLibrary implementations

Question

I've been tinkering with Azure's spatial anchors API. I followed the docs and examples provided by Microsoft without many issues until I tried to make my own project from it. When I try to run a custom project using the Spatial anchors API it crashes looking for some functions that should be provided by the libraries specified in the gradle. The error log says this:

2019-05-28 10:32:10.642 28982-28982/com.azurelib.azureanchorsclean E/AndroidRuntime: FATAL EXCEPTION: main Process: com.azurelib.azureanchorsclean, PID: 28982 java.lang.UnsatisfiedLinkError: No implementation found for com.microsoft.azure.spatialanchors.status com.microsoft.azure.spatialanchors.NativeLibrary.ssc_cloud_spatial_anchor_session_create(com.microsoft.azure.spatialanchors.Out) (tried Java_com_microsoft_azure_spatialanchors_NativeLibrary_ssc_1cloud_1spatial_1anchor_1session_1create and Java_com_microsoft_azure_spatialanchors_NativeLibrary_ssc_1cloud_1spatial_1anchor_1session_1create__Lcom_microsoft_azure_spatialanchors_Out_2) at com.microsoft.azure.spatialanchors.NativeLibrary.ssc_cloud_spatial_anchor_session_create(Native Method) ...

The relevant ssc_cloud... functions can be found in the spatialanchors_java dependency specified in the gradle build:

For the cloud session, I start a new activity in my MainActivity's onResume() :

@Override
protected void onResume(){
    super.onResume();
    Intent intent = new Intent(this, AzureSpatialAnchorsActivity.class);
    intent.putExtra("BasicDemo", true);
    startActivity(intent);
}

And on AzureSpatialAnchorsActivity I create the ArCore Session and start the anchor manager:

    @Override
    protected void onResume() {
        super.onResume();

        if (session == null) {
            try {
                ...
                // Create the session.
                session = new Session(/* context= */ this);

            ... //Required catch statements
            } catch (Exception e) {
                message = "Failed to create AR session";
                exception = e;
            }
        }


        try {
            session.resume();
            startNewSession();
        } catch (CameraNotAvailableException e) {
            ...
        }
    }

    private void startNewSession() {
        destroySession();

        cloudAnchorManager = new AzureSpatialAnchorsManager(session);
        cloudAnchorManager.addAnchorLocatedListener(this::onAnchorLocated);
        cloudAnchorManager.addLocateAnchorsCompletedListener(this::onLocateAnchorsCompleted);
        cloudAnchorManager.addSessionUpdatedListener(this::onSessionUpdated);
        cloudAnchorManager.start();
    }

The error happens because when I try to create a CloudSpatialAnchorSession object

public AzureSpatialAnchorsManager(Session arCoreSession) {
    spatialAnchorsSession = new CloudSpatialAnchorSession();
    ...
}

the constructor calls a function from NativeLibrary

public CloudSpatialAnchorSession() {
    Out<Long> result_handle = new Out();
    status resultStatus = NativeLibrary.ssc_cloud_spatial_anchor_session_create(result_handle);
    this.handle = (Long)result_handle.value;
    NativeLibraryHelpers.checkStatus(this.handle, resultStatus);
    CookieTracker.add(this);
}

The problem seems to be that what I previously showed on the the jar screenshot is all there is. ssc_cloud_spatial_anchor_session_create gets called, the application lands on an dead end:

class NativeLibrary {
    NativeLibrary() {
    }
    ...
    static native status ssc_cloud_spatial_anchor_session_create(Out<Long> var0);
    ...
}

The gradle and other configs are copy/paste from the original Microsoft sample. I can't find what I'm missing that's causing my custom project not to find the implementations of NativeLibrary . For reference, here's the Microsoft project that I'm using to base my own project of

Here's my actual gradle files just for reference:

Project gradle

buildscript {
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'
    }
}

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Module gradle:

apply plugin: 'com.android.application'
def azureSpatialAnchorsSdkVersion = '1.1.0'
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.azurelib.azureanchorsclean"
        minSdkVersion 24
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.ar:core:1.7.0'
    implementation "com.microsoft.azure.spatialanchors:spatialanchors_jni:[${azureSpatialAnchorsSdkVersion}]"
    implementation "com.microsoft.azure.spatialanchors:spatialanchors_java:[${azureSpatialAnchorsSdkVersion}]"
    implementation 'de.javagl:obj:0.2.1'
    implementation 'com.microsoft.aad:adal:1.16.0'
    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'
}

Thanks!

Answer 1

Since you are creating your own project are you calling the initialize method inside your OnCreate in the application class?

 @Override
    public void onCreate() {
        super.onCreate();

        // Use application's context to initialize CloudServices!
        CloudServices.initialize(this);
    }