首先自定义一个application，继承Application，并在AndroidManifest.xml文件中配置它。

class TvApplication : Application() {

    companion object {
        @Volatile
        var context: Application? = null
            private set

        fun getContext(): Context {
            return context ?: throw IllegalStateException("Application context not initialized yet.")
        }

    }

    override fun onCreate() {
        super.onCreate()
        context = this
    }
}

使用示例

val packageManager = TvApplication.getContext().packageManager
            ?: throw IllegalStateException("PackageManager is null. Ensure that the application context is initialized.")