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Android BLE Issues(问题集)

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新进入公司做智能家居设备，于是查寻了一下Android BLE的问题，这是比较全面的一片文章，简单翻译一下。

原文链接:http://www.slideshare.net/yeokm1/introduction-to-bluetooth-low-energy

Android issues (the past) BLE支持之前的问题

http://stackoverflow.com/questions/14118658/devices-with-android-4-2-jelly-bean-supported-bluetooth-low-energy-ble

  • Before Android 4.3 (July 2013) Android 4.3在2013年七月之前
    • Fragmentation hell 痛苦的碎片化
    • Proprietary Libraries by OEMs, Android <= 4.2 各大OEM厂商提供的私有库
      • Samsung (quite reliable)
      • HTC – buggy, unreliable
      • Motorola (reliable but conflicts with Android 4.3)
    • Architecture issues 架构上的问题
  • Testing issues 其它问题

Android issues (today) BLE支持之后的问题

http://stackoverflow.com/questions/17870189/android-4-3-bluetooth-low-energy-unstable

  1. OS fragmentation
  • 74.2% of Android devices support BLE 只有74.2%的设备支持
  • Few support peripheral mode: 35.3% minus Nexus 4, 5, 7 (2012/2013) 只有35.3%支持手机作为外围设备，只有5.0以上才支持。

  1. All callbacks from BLE APIs are not on UI thread. 所有的回调不是在UI线程

  2. APIs considered new, some functions are buggy 考虑使用新的API的话会有一些bug

  3. Frequent connection drops (< 5.0) 5.0之前频繁连接会导致连接无法使用

    参考：https://code.google.com/p/android/issues/detail?id=180440

  4. Max BLE connections: 最大连接数

  • Software cap in Bluedroid code: BTA_GATTC_CONN_MAX, GATT_MAX_PHY_CHANNEL
  • Android 4.3: 4
  • 4.4 - 5.0+: 7
  1. No API callback to indicate scanning has stopped 没有提供startLeScan()扫描结束的回调

  • Scan supposed to be indefinite by API specification, but some phones stop scan after some time API规范与实际扫描结果并不相符，并且一些手机停止扫描需要的时间比较长。

    比如有一些手机会一直回调设备，直到设备连接成功，而有一些设备(Samsung…)只回调一次

  • Known offender: Samsung 比如著名的三星

  • Solution: Restart scan at regular intervals 解决方法：扫描定时

  1. Different scan return result behaviours (See further reading) 扫描的结果并不相同
  • Some phones filter advertisement results, some phones do not. (usually on 4.3 and 4.4)有一些设备会过滤掉广告结果
  1. Bugs on (Samsung) phones at least < 5.0 三星5.0之前bug
  • Scan using service UUID filtering does not work -> no results returned 使用startLeScan()过滤UUID无法工作，没有返回结果
  • connectGatt() must be called from UI threadconnectGatt()必须在UI线程中调用
  1. Slow LE initial discovery and connection time 初始化查找与连接设备相当缓慢
  • HTC seems to have this issueHTC好像有这个问题

    华为，三星也会，其他没有测试过

  1. A high-level view on issues collated by Anaren 一些高层view问题的整理
  1. A more comprehensive list of issues has been collated by iDevicesInc 全面问题清单

个人推荐使用基于RxJava的库:https://github.com/Polidea/RxAndroidBle