Caused by: java.lang.IllegalStateException: Cannot access database on the main thread since it may potentially lock the UI for a long period of time.

在这使用Kotlin 建立Room资料库时发生问题

不允许我们在主线程建立

於是我们需要

coroutines

在专案build.gradle(:app) dependencies中加入这两段

dependencies {
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0"
}