android - Azure 空间 anchor 集成问题。缺少 NativeLibrary 实现

Question

我一直在修补 Azure 的空间 anchor API。我按照 Microsoft 提供的文档和示例进行操作，没有遇到很多问题，直到我尝试从中创建自己的项目。当我尝试使用空间 anchor API 运行自定义项目时，它会崩溃，寻找 gradle 中指定的库应提供的一些函数。错误日志是这样写的:

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) ...

相关的ssc_cloud...函数可以在gradle构建中指定的spatialanchors_java依赖项中找到:

对于云 session ，我在 MainActivity 的 onResume() 中启动一个新 Activity :

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

在 AzureSpatialAnchorsActivity 上，我创建 ArCore Session 并启动 anchor 管理器:

    @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();
    }

发生错误是因为当我尝试创建 CloudSpatialAnchorSession 对象时

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

构造函数调用来自NativeLibrary的函数

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);
}

问题似乎是我之前在 jar 屏幕截图上显示的内容就是全部。 ssc_cloud_spatial_anchor_session_create 被调用，应用程序陷入死胡同:

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

gradle 和其他配置是从原始 Microsoft 示例中复制/粘贴的。我找不到我所缺少的内容，导致我的自定义项目找不到 NativeLibrary 的实现。仅供引用，here's the Microsoft project我用它来构建我自己的项目

这是我的实际 gradle 文件仅供引用:

项目等级

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
}

模块等级:

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'
}

谢谢!

Answer 1

由于您正在创建自己的项目，因此您是否在应用程序类的 OnCreate 中调用初始化方法？

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

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