我从HERE的官方入门指南pdf中完全复制了此代码，但是当我尝试运行它时，它componentFragment.init()失败并出现UNKNOWN错误。
错误详细信息：
java.lang.RuntimeException: Cannot initialize the engine twice
at com.nokia.maps.MapsEngine.<init>(MapsEngine.java:604)
at com.nokia.maps.MapsEngine.b(MapsEngine.java:897)
at com.nokia.maps.MapsEngine.b(MapsEngine.java:394)
at com.nokia.maps.MapsEngine.a(MapsEngine.java:346)
at com.here.android.mpa.common.MapEngine.init(MapEngine.java:129)
at com.nokia.maps.al.a(CompositeFragmentImpl.java:92)
at com.here.android.mpa.ar.CompositeFragment.init(CompositeFragment.java:108)
at hu.appz4.heretest.BasicMapActivity.init(BasicMapActivity.java:106)
at hu.appz4.heretest.BasicMapActivity.onRequestPermissionsResult(BasicMapActivity.java:97)
at hu.appz4.heretest.BasicMapActivity.checkPermissions(BasicMapActivity.java:80)
at hu.appz4.heretest.BasicMapActivity.onCreate(BasicMapActivity.java:58)
at android.app.Activity.performCreate(Activity.java:6272)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
at android.app.ActivityThread.access$900(ActivityThread.java:157)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5551)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
BasicMapActivity.java
package hu.appz4.heretest;
import android.Manifest;
import android.Manifest.permission;
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.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import com.here.android.mpa.ar.ARController;
import com.here.android.mpa.ar.ARController.Error;
import com.here.android.mpa.ar.ARIconObject;
import com.here.android.mpa.ar.CompositeFragment;
import com.here.android.mpa.common.GeoCoordinate;
import com.here.android.mpa.common.Image;
import com.here.android.mpa.common.MapEngine;
import com.here.android.mpa.common.OnEngineInitListener;
import com.here.android.mpa.mapping.Map;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class BasicMapActivity extends Activity {
/**
* permissions request code
*/
private final static int REQUEST_CODE_ASK_PERMISSIONS = 1000;
/**
* 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,
Manifest.permission.CAMERA, permission.ACCESS_NETWORK_STATE, permission.ACCESS_WIFI_STATE,
permission.INTERNET};
private Map map;
private ARController arController;
// buttons which will allow the user to start LiveSight and add objects
private Button startButton;
private Button stopButton;
private Button toggleObjectButton;
// ARIconObject represents the image model which LiveSight accepts for display
private ARIconObject arIconObject;
private boolean objectAdded;
private CompositeFragment compositeFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
checkPermissions();
}
/**
* 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
init();
break;
}
}
private void init() {
setContentView(R.layout.activity_main);
// Search for the composite fragment to finish setup by calling init().
compositeFragment = (CompositeFragment) getFragmentManager().findFragmentById(R.id.compositefragment);
compositeFragment.init(this, new OnEngineInitListener() {
@Override
public void onEngineInitializationCompleted(OnEngineInitListener.Error error) {
if (error == OnEngineInitListener.Error.NONE) {
// retrieve a reference of the map from the composite fragment
map = compositeFragment.getMap();
// Set the map center to the Vancouver Downtown region
map.setCenter(new GeoCoordinate(47.529877, 19.032750, 0.0), Map.Animation.NONE);
// Set the map zoom level to the average between min and max
map.setZoomLevel((map.getMaxZoomLevel() + map.getMinZoomLevel()) / 2);
// LiveSight setup should be done after fragment init is complete
setupLiveSight();
} else {
Toast.makeText(BasicMapActivity.this, "ERROR: Cannot initialize Composite Fragment" + " - " + error.getDetails(), Toast.LENGTH_SHORT).show();
System.out.println("ERROR: Cannot initialize Composite Fragment" + " - " + error.getDetails());
}
}
});
// hold references to the buttons for future use
startButton = (Button) findViewById(R.id.startLiveSight);
stopButton = (Button) findViewById(R.id.stopLiveSight);
toggleObjectButton = (Button) findViewById(R.id.toggleObject);
startButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) {
startLiveSight(v);
}
});
stopButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) {
stopLiveSight(v);
}
});
toggleObjectButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) {
toggleObject(v);
}
});
}
private void setupLiveSight() {
// ARController should not be used until fragment init has completed
arController = compositeFragment.getARController();
// tells LiveSight to display icons while viewing the map (pitch down)
arController.setUseDownIconsOnMap(true);
// tells LiveSight to use a static mock location instead of the devices GPS fix
arController.setAlternativeCenter(new GeoCoordinate(47.529877, 19.032750, 0.0));
}
public void startLiveSight(View view) {
if (arController != null) {
// triggers the transition from Map mode to LiveSight mode
Error error = arController.start();
if (error == Error.NONE) {
startButton.setVisibility(View.GONE);
stopButton.setVisibility(View.VISIBLE);
} else {
Toast.makeText(getApplicationContext(), "Error starting LiveSight: " + error.toString(), Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getApplicationContext(), "ArController NULL", Toast.LENGTH_LONG).show();
}
}
public void stopLiveSight(View view) {
if (arController != null) {
// exits LiveSight mode and returns to Map mode
Error error = arController.stop(true);
if (error == Error.NONE) {
startButton.setVisibility(View.VISIBLE);
stopButton.setVisibility(View.GONE);
} else {
Toast.makeText(getApplicationContext(), "Error stopping LiveSight: " + error.toString(), Toast.LENGTH_LONG).show();
}
}
}
public void toggleObject(View view) {
if (arController != null) {
if (!objectAdded) {
if (arIconObject == null) {
final Image image = new Image();
try {
image.setImageResource(R.mipmap.ic_launcher);
} catch (IOException e) {
e.printStackTrace();
}
// creates a new icon object which uses the same image in up and down views
arIconObject = new ARIconObject(new GeoCoordinate(47.529877, 19.032750, 2.0), (View) null, image);
}
// adds the icon object to LiveSight to be rendered
arController.addARObject(arIconObject);
objectAdded = true;
toggleObjectButton.setText("Remove Object");
} else {
// removes the icon object from LiveSight, it will no longer be renderedarController.removeARObject(arIconObject);
objectAdded = false;
toggleObjectButton.setText("Add Object");
}
}
}
}
build.Gradle依赖项（按照guide.pdf中的步骤导入官方HERE-sdk.aar）
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.2.0'
testCompile 'junit:junit:4.12'
compile project(':HERE-sdk')
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="hu.appz4.heretest"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<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"/>
<!-- Additional permission for LiveSight
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />-->
<uses-permission android:name="android.permission.CAMERA"/>
<application
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat">
<activity
android:name="hu.appz4.heretest.BasicMapActivity"
android:label="@string/app_name">
<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="the app id from HERE site"/>
<meta-data
android:name="com.here.android.maps.apptoken"
android:value="the app code from HERE site"/>
<meta-data
android:name="com.here.android.maps.license.key"
android:value="the license key from HERE site"/>
</application>
</manifest>
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="hu.appz4.heretest.BasicMapActivity">
<fragment
class="com.here.android.mpa.ar.CompositeFragment"
android:id="@+id/compositefragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<Button
android:id="@+id/startLiveSight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:onClick="startLiveSight"
android:text="@string/label_button_startlivesight" />
<Button
android:id="@+id/stopLiveSight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:onClick="stopLiveSight"
android:text="@string/label_button_stoplivesight"
android:visibility="gone" />
<Button
android:id="@+id/toggleObject"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:onClick="toggleObject"
android:text="@string/label_button_addobject" />
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
答案 0 :(得分：1)
我偶然设法通过将此代码添加到 AndroidManifest.xml
来解决此问题<service
android:name="com.here.android.mpa.service.MapService"
android:exported="true"
android:label="HereMapService"
android:process="global.Here.Map.Service.v2">
<intent-filter>
<action android:name="com.here.android.mpa.service.MapService"/>
</intent-filter>
</service>
答案 1 :(得分：0)
在棉花糖中，你需要添加4个权限，你的地图才能正常工作
@Override
public void onPause() {
super.onPause();
if (compositeFragment != null){
try {
this.getFragmentManager().beginTransaction().remove(compositeFragment).commit();
}catch (Exception exONDestroyView){
System.out.println(exONDestroyView);
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
if (compositeFragment != null){
try {
this.getFragmentManager().beginTransaction().remove(compositeFragment).commit();
}catch (Exception exONDestroy){
System.out.println(exONDestroy);
}
}
}
使用此链接获取权限
Request Check Multiple Run time Permissions at once in android Marshmallow
{{1}}
在您的活动中添加两个方法希望此帮助