如何在Kotlin中构建自动填充服务？

implementation 'androidx.autofill:autofill:1.1.0'

class MyAutofillService : AutofillService() {
    override fun onFillRequest(
        request: FillRequest,
        cancellationSignal: CancellationSignal,
        callback: FillCallback
    ) {
        // 处理自动填充请求并提供填充数据
        // ...
    }

    override fun onSaveRequest(request: SaveRequest, callback: SaveCallback) {
        // 处理保存填充数据的请求
        // ...
    }
}

<service android:name=".MyAutofillService">
    <intent-filter>
        <action android:name="android.service.autofill.AutofillService" />
    </intent-filter>
</service>

override fun onFillRequest(
    request: FillRequest,
    cancellationSignal: CancellationSignal,
    callback: FillCallback
) {
    // 解析请求中的填充数据请求
    val fillContexts = request.fillContexts
    val structure = fillContexts[fillContexts.size - 1].structure
    val fillFields = structure?.findAutofillFields()

    // 创建填充数据
    val fillResponseBuilder = FillResponse.Builder()

    // 添加填充数据到填充响应中
    fillResponseBuilder.addDataset(datasetBuilder.build())

    // 发送填充响应
    callback.onSuccess(fillResponseBuilder.build())
}

override fun onSaveRequest(request: SaveRequest, callback: SaveCallback) {
    // 处理保存填充数据的请求
    // ...

    // 通知系统填充数据已保存
    callback.onSuccess()
}