Android 平台开发 (#1)

* 修复 UUID 创建失败的问题

* 移除 scanning 属性

* 临时提交

* CentralManager 开发 & 示例项目开发

* CentralManager 开发 & 示例项目开发

* android 插件生命周期监听

* 修改 API

* 示例程序开发

* 修改字体，添加 API，解决后台问题

* Central#connect API

* 蓝牙连接部分开发

* 蓝牙连接部分开发

* 解决一些问题

* 解决一些问题

* Connect API 优化

* 添加 API

* example 开发

* API 基本完成

* 消息重命名

* API 修改，Android 实现

* 删除多余代码

* 删除多余文件

* 解决 descriptor 自动生成报错的问题

* 还原 Kotlin 版本，广播处理代码迁移至 dart 端

* Kotlin 版本升至 1.5.20

* 解决特征值通知没有在主线程触发的问题，优化代码

* 引入哈希值，避免对象销毁后继续使用

* 使用下拉刷新代替搜索按钮

* 解决由于热重载和蓝牙关闭产生的问题

* 更新插件信息

* 更新 README 和 CHANGELOG

* 更新许可证

* 添加注释

* 添加注释，central 拆分

README.md

@@ -1,15 +1,42 @@
-# bluetooth_low_energy
+# Bluetooth Low Energy
 
-A new flutter plugin project.
+A bluetooth low energy plugin for flutter, which can be used to develope central role apps.
+
+## Features
+
+### Central APIs
+- [x] Discover advertisements.
+- [x] Connect/Disconnect to GATTs.
+- [x] Read/Write/Notify characteristics.
+- [x] Read/Write descriptors.
+
+### Peripheral APIs
+- [ ] Add/Send advertisements.
+- [ ] Add services
+- [ ] Add/Listen/Write characteristics
+- [ ] Add/Listen/Write descriptors.
+- [ ] Listen GATT connect/disconnect events.
 
 ## Getting Started
 
-This project is a starting point for a Flutter
-[plug-in package](https://flutter.dev/developing-packages/),
-a specialized package that includes platform-specific implementation code for
-Android and/or iOS.
+Add `bluetooth_low_energy` as a [dependency in your pubspec.yaml file](https://flutter.dev/using-packages/).
 
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+```
+dependencies:
+  bluetooth_low_energy: ^<latest-version>
+```
 
+### Android
+
+Make sure you have a `miniSdkVersion` with 21 or higher in your `android/app/build.gradle` file, now we only support Android 5.0 or above.
+
+*Note*: Bluetooth Low Energy doesn't work on Android emulators, so use physical devices which has bluetooth features for development.
+
+### iOS
+
+TO BE DONE.
+
+## Issues
+
+- Only support Android for now, iOS will available as soon as possible.
+- Only support central APIs for now.