我正在开发一个Ionic项目，在构建应用程序时遇到了谷歌地图的错误。
import com.google.android.gms.maps.model.StreetViewSource;
^
symbol: class StreetViewSource
location: package com.google.android.gms.maps.model
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:87: error: cannot find symbol
StreetViewSource source = "OUTDOOR".equals(cameraOpts.getString("source")) ?
^
symbol: class StreetViewSource
location: class PluginStreetViewPanorama
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:88: error: cannot find symbol
StreetViewSource.OUTDOOR : StreetViewSource.DEFAULT;
^
symbol: variable StreetViewSource
location: class PluginStreetViewPanorama
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:88: error: cannot find symbol
StreetViewSource.OUTDOOR : StreetViewSource.DEFAULT;
^
symbol: variable StreetViewSource
location: class PluginStreetViewPanorama
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:280: error: cannot find symbol
StreetViewSource source = "OUTDOOR".equals(cameraOpts.getString("source")) ?
^
symbol: class StreetViewSource
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:281: error: cannot find symbol
StreetViewSource.OUTDOOR : StreetViewSource.DEFAULT;
^
symbol: variable StreetViewSource
I:\Team SlowCoach\OfferShare\platforms\android\src\plugin\google\maps\PluginStreetViewPanorama.java:281: error: cannot find symbol
StreetViewSource.OUTDOOR : StreetViewSource.DEFAULT;
^
symbol: variable StreetViewSource
在 package.json 中：
"cordova-plugin-googlemaps": "^2.4.6",
"@ionic-native/google-maps": "^4.9.1"
在 project.properties 中：
target=android-26
android.library.reference.1=CordovaLib
cordova.system.library.1=com.facebook.android:facebook-android-sdk:4.+
cordova.system.library.2=com.google.android.gms:play-services-auth:11.+
cordova.system.library.3=com.google.android.gms:play-services-identity:11.+
cordova.gradle.include.1=twitter-connect-plugin/offershare-twitter.gradle
cordova.system.library.4=com.android.support:support-v4:24.1.1+
cordova.system.library.5=com.squareup.okhttp3:okhttp:3.+
cordova.gradle.include.2=cordova-plugin-googlemaps/offershare-tbxml-android.gradle
cordova.system.library.6=com.google.android.gms:play-services-maps:11.+
cordova.system.library.7=com.google.android.gms:play-services-location:11.+
cordova.system.library.8=com.android.support:support-core-utils:26.1.0
我应该使用哪个版本的Google地图？