kotlin

Save 16 bit signed PCM audio file on Android from BGX device

由 ▼魔方 西西 提交于 2020-12-27 05:56:34
问题 I am working on a mobile application which should be able to read some audio data from a device via Bluetooth. The device has a BGX low energy bluetooth module. There's a very nicely documented framework for BGX on the website of the manufacturer and I successfully managed to connect the device and read the audio data. The problem is that the BGXService provides me the data in String format, which is an array of chars and char is 16 bit unsigned in Java; However, the audio data that I want to

tmap_map_fluttify腾讯地图插件无法调试的解决办法

由 我怕爱的太早我们不能终老 提交于 2020-12-27 00:01:26
问题：在pubspec.yaml中增加依赖 tmap_map_fluttify : ^0.3.0 然后flutter run。结果卡死在 Running Gradle task 'assembleDebug'... 解决过程： 猜应该有打日志的命令，果然 flutter run --verbose-system-logs 卡了好久，出现以下提示。 FAILURE: Build failed with an exception. * What went wrong: A problem occurred configuring project ':foundation_fluttify'. > Could not resolve all artifacts for configuration ':foundation_fluttify:classpath'. > Could not download kotlin-compiler-embeddable.jar (org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.50) > Could not get resource 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-compiler-embeddable/1.3

Telephonymanager.EXTRA_INCOMING_NUMBER is deprecated in API level 29

由 社会主义新天地 提交于 2020-12-26 18:38:24
问题 I am in situation where I need to identify incoming call phone number in Android but when using TelephonyManager.EXTRA_INCOMING_NUMBER android studio warning EXTRA_INCOMING_NUMBER is deprecated .I gone through the developers.android.com, it shows apps performing call screening should use the CallScreeningService API instead. But I can't figure out how to use CallScreeningService to get incoming call phone number. Anyone can help me? 回答1: As @Saurabh said, the new way to screen calls is

Google Nearby Messages Publish Returns 2806 Forbidden (Android - React Native)

由 你。 提交于 2020-12-26 06:53:06
问题 We are currently utilizing a React Native wrapper over Google Nearby Messages (repo code here). On Android everything was working until about a week ago when suddenly everytime anything is published it returns a 2806 Forbidden error with almost no context. Everything is working on the iOS side. We have been trying to solve this here: https://github.com/mrousavy/react-native-google-nearby-messages/issues/25 but we are turning to stackoverflow as we are hoping somebody has seen this and solved

What is the purpose of kotlin contract

由 寵の児 提交于 2020-12-26 06:39:42
问题 Was reading the apply function code source and found contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } and contract has an empty body, experimental @ContractsDsl @ExperimentalContracts @InlineOnly @SinceKotlin("1.3") @Suppress("UNUSED_PARAMETER") public inline fun contract(builder: ContractBuilder.() -> Unit) { } what is the real purpose of contract and is it here to stay in the next versions? 回答1: What is the real purpose of contract The real purpose of Kotlin contracts is to

How to pick time using material design?

由 淺唱寂寞╮ 提交于 2020-12-26 04:43:45
问题 how to pick a time using material:1.3.0-alpha01, I am looking time picker following screenshot, which I found in material io. I tried date picker is working Material Date picker //Creating a MaterialDatePicker.Builder instance that gives us a single date selector. val builder : MaterialDatePicker.Builder<*> = MaterialDatePicker.Builder.datePicker() // 1 //Building-up the MaterialDatePicker by calling a builder.build function val picker : MaterialDatePicker<*> = builder.build() // 2 //Display

How to pick time using material design?

由 冷暖自知 提交于 2020-12-26 04:43:42
问题 how to pick a time using material:1.3.0-alpha01, I am looking time picker following screenshot, which I found in material io. I tried date picker is working Material Date picker //Creating a MaterialDatePicker.Builder instance that gives us a single date selector. val builder : MaterialDatePicker.Builder<*> = MaterialDatePicker.Builder.datePicker() // 1 //Building-up the MaterialDatePicker by calling a builder.build function val picker : MaterialDatePicker<*> = builder.build() // 2 //Display

How to pick time using material design?

由 僤鯓⒐⒋嵵緔 提交于 2020-12-26 04:43:21
问题 how to pick a time using material:1.3.0-alpha01, I am looking time picker following screenshot, which I found in material io. I tried date picker is working Material Date picker //Creating a MaterialDatePicker.Builder instance that gives us a single date selector. val builder : MaterialDatePicker.Builder<*> = MaterialDatePicker.Builder.datePicker() // 1 //Building-up the MaterialDatePicker by calling a builder.build function val picker : MaterialDatePicker<*> = builder.build() // 2 //Display

Now in Android #15 —— 最新 Android 知识分享

由 ぃ、小莉子 提交于 2020-12-25 03:40:43
(微信不支持外链，点击文末 阅读原文，体验更佳！) 大家好，我是秉心说。 新一期的 Now in Android 又更新了，原文地址如下： https://medium.com/androiddevelopers/now-in-android-15-44bf3307a8f2 照例给大家总结一下。往期所有文章可以在这里查看： https://luyao.tech/categories/nowinandroid 下面进入这一期的最新内容。 Android 11 上一期中介绍了 开发者预览版 2 ，到目前为止没有新版本的发布。Chet Haase 在原文中分享了几个值的一提的内容。 Can You Take the Heat? Android 11 开发者预览版 2 为 Native 开发者新增了 Thermal API 。（我也不知道这是个啥） 在 Android 模拟器上运行 ARM 应用 Michael Hazard 发布了一篇关于在 Android 模拟器上运行 ARM 应用的文章： https://android-developers.googleblog.com/2020/03/run-arm-apps-on-android-emulator.html 我们的 PC 大多基于 x86 架构，对于依赖 ARM 库且无法构建 x86 版本应用的开发者来说，只能使用完整的 ARM

如何向数据库集群快速导入千万条数据

由 ◇◆丶佛笑我妖孽 提交于 2020-12-24 15:53:44
一、数据导入的方式 向MySQL数据库导入数据，通常有两种办法，第一种是利用SOURCE命令，第二种是使用LOAD DATA命令。 SOURCE命令是通过执行SQL文件中的INSERT语句来实现数据的导入。正常情况下，如果我们向单节点的MySQL，用INSERT语句批量写入数据，在普通的PC机上，写入10万条数据，大概需要7~8分钟时间。按照这个速度推算，写入1千万条数据大概需要10个小时以上。如果在集群条件下，这个速度会更慢。 MySQL的集群分为PXC和Replication集群。其中Replication集群是异步传输的，它只保证事物在当前节点成功写入，数据是否能同步到其他节点，Replication集群并不能给我们打包票。所以Replication集群经常出现A节点写入数据，但是在B节点读取不到数据的情况。每年Apple秋季发布会之后，很多人会到Apple官网抢购iPhone手机，然而每年都有顾客会遇到付款之后，订单依旧是未支付的状态。这就是典型的Replication集群的效果，数据出现了不一致。如果采用PXC集群，因为数据是同步传输，所以我们在A节点写入数据，提交事务的时候，PXC必须保证所有MySQL节点都成功写入这条数据，才算事务提交成功，所以不会出现A节点写入数据，在B节点上读取不到数据的情况。因此PXC更加适合保存重要的数据，例如交易记录、学籍信息、考试成绩
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