小编Dav*_*eju的帖子

我正在创建一个应用程序来扫描条形码并将该信息使用 Android 视图模型和 LiveData 获取到房间数据库中。这是错误信息

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.davin.scoutingapp2019/com.example.davin.scoutingapp2019.DataDisplay}: java.lang.RuntimeException: Cannot create an instance of class com.example.davin.scoutingapp2019.TeamViewModel
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
    at android.app.ActivityThread.-wrap12(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6123)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
 Caused by: java.lang.RuntimeException: Cannot create an instance of class com.example.davin.scoutingapp2019.TeamViewModel
    at android.arch.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:207)
    at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:134)
    at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:102)
    at com.example.davin.scoutingapp2019.DataDisplay.onCreate(DataDisplay.java:30)
    at android.app.Activity.performCreate(Activity.java:6672)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724) 
    at android.app.ActivityThread.-wrap12(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:154) 
    at android.app.ActivityThread.main(ActivityThread.java:6123) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at …

我对 DynamoDB 非常陌生，并开始学习 Java AWS SDK 1.x。我使用以下代码初始化了我的本地 dynamodb 端点

AmazonDynamoDB client = AmazonDynamoDBClientBuilder
                       .standard()
                       .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("http://localhost:8000","us-west-2"))
                       .build();

DynamoDB dynamoDB = new DynamoDB(client);

但是现在我将依赖项更改为 Dynamodb 和 Java 2.15.52，因此客户端初始化为：

DynamoDbClient client = DynamoDbClient.builder().build();

如何使用新配置我的本地端点DynamoDbClient？