问此处地图API错误:无法初始化未知的地图片段

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="fr.alan.myapp">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    android:hardwareAccelerated="true">
    <activity android:name=".MapActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data android:name="com.here.android.maps.appid"
        android:value="App id from Here website"/>
    <meta-data android:name="com.here.android.maps.apptoken"
        android:value="App code from Here website "/>
    <meta-data android:name="com.here.android.maps.license.key"
        android:value="License key"/>

    <service
        android:name="com.here.android.mpa.service.MapService"
        android:label="MyAppMapService"
        android:exported="false">
        <intent-filter>
            <action android:name="fr.alan.myapp.MapService">
            </action>
        </intent-filter>
    </service>

</application>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "fr.alan.myapp"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
    flatDir {
        dirs 'libs'
    }
}

dependencies {
    implementation(name:'HERE-sdk', ext:'aar')
    implementation 'com.google.code.gson:gson:2.2.4'
    implementation 'com.android.support:support-v4:27.0.2'
    implementation 'com.android.support:support-annotations:27.0.2'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    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'
}

package fr.alan.myapp

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.widget.Toast;

import com.here.android.mpa.common.GeoCoordinate;
import com.here.android.mpa.common.OnEngineInitListener;
import com.here.android.mpa.mapping.Map;
import com.here.android.mpa.mapping.MapFragment;

public class MapActivity extends Activity {

    // permissions request code
    private final static int REQUEST_CODE_ASK_PERMISSIONS = 1;

    /**
     * Permissions that need to be explicitly requested from end user.
     */
    private static final String[] REQUIRED_SDK_PERMISSIONS = new String[] {
            Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.WRITE_EXTERNAL_STORAGE };

    // map embedded in the map fragment
    private Map map = null;

    // map fragment embedded in this activity
    private MapFragment mapFragment = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        checkPermissions();
    }

    private void initialize() {
        setContentView(R.layout.activity_map);

        // Search for the map fragment to finish setup by calling init().
        mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.mapfragment);

        // Set up disk cache path for the map service for this application
        boolean success = com.here.android.mpa.common.MapSettings.setIsolatedDiskCacheRootPath(
                getApplicationContext().getExternalFilesDir(null) + File.separator + ".here-maps",
                "com.here.android.tutorial.MapService");

        if (!success) {
            Toast.makeText(getApplicationContext(), "Unable to set isolated disk cache path.", Toast.LENGTH_LONG);
        } else {
            mapFragment.init(new OnEngineInitListener() {
                @Override
                public void onEngineInitializationCompleted(OnEngineInitListener.Error error) {
                    if (error == OnEngineInitListener.Error.NONE) {
                        // retrieve a reference of the map from the map fragment
                        map = mapFragment.getMap();
                        // Set the map center to the Vancouver region (no animation)
                        map.setCenter(new GeoCoordinate(49.196261, -123.004773, 0.0),
                                Map.Animation.NONE);
                        // Set the zoom level to the average between min and max
                        map.setZoomLevel((map.getMaxZoomLevel() + map.getMinZoomLevel()) / 2);
                    } else {
                        Log.e("Error", "ERROR: Cannot initialize Map Fragment " + error);
                    }
                }
            });
        }
    }

    /**
     * Checks the dynamically controlled permissions and requests missing permissions from end user.
     */
    protected void checkPermissions() {
        final List<String> missingPermissions = new ArrayList<String>();
        // check all required dynamic permissions
        for (final String permission : REQUIRED_SDK_PERMISSIONS) {
            final int result = ContextCompat.checkSelfPermission(this, permission);
            if (result != PackageManager.PERMISSION_GRANTED) {
                missingPermissions.add(permission);
            }
        }
        if (!missingPermissions.isEmpty()) {
            // request all missing permissions
            final String[] permissions = missingPermissions
                    .toArray(new String[missingPermissions.size()]);
            ActivityCompat.requestPermissions(this, permissions, REQUEST_CODE_ASK_PERMISSIONS);
        } else {
            final int[] grantResults = new int[REQUIRED_SDK_PERMISSIONS.length];
            Arrays.fill(grantResults, PackageManager.PERMISSION_GRANTED);
            onRequestPermissionsResult(REQUEST_CODE_ASK_PERMISSIONS, REQUIRED_SDK_PERMISSIONS,
                    grantResults);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
                                           @NonNull int[] grantResults) {
        switch (requestCode) {
            case REQUEST_CODE_ASK_PERMISSIONS:
                for (int index = permissions.length - 1; index >= 0; --index) {
                    if (grantResults[index] != PackageManager.PERMISSION_GRANTED) {
                        // exit the app if one permission is not granted
                        Toast.makeText(this, "Required permission '" + permissions[index]
                                + "' not granted, exiting", Toast.LENGTH_LONG).show();
                        finish();
                        return;
                    }
                }
                // all permissions were granted
                initialize();
                break;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World"
        tools:context=".BasicMapActivity" />

    <!-- Map Fragment embedded with the map object -->
    <fragment
        class="com.here.android.mpa.mapping.MapFragment"
        android:id="@+id/mapfragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>