Error 515: Not connected to a Bluetooth device. 原因：经典蓝牙设备未正常连接上，就进行数据收发操作导致的异常，加一个连接状态判断就行。

...道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包可以在其它信道上传输）。广播包发送给附近所有的observer（扫描者）。 数据包：数据包Access Address为一个32bit的随机值，由Initiator生成。数据包，其实...

...道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包可以在其它信道上传输）。广播包发送给附近所有的observer（扫描者）。数据包：数据包Access Address为一个32bit的随机值，由Initiator生成。数据包，其实是...

...看到，笔记本电脑的尺寸这一属性有着10个枚举值，而“蓝牙功能”这个属性值是个布尔值，数据的筛选性非常差。 在用户所选择的过滤条件不确定的情况下，解决全属性问题的思路有两个：一个是穷举所有可能的过滤条件组...

编译apk编译报错信息如下： D:\ChineseAppInventor\resources\app.asar.unpacked\tmp\1781143258366_6476145339306496000-0\youngandroidproject\..\build\intermediates\res\merged\layout\abc_alert_dialog_button_bar_material.xml: note: using v22 attributes; synthesizing resource appinventor.ai_18721...

I submitted a brand new app to AppStore and it got rejected by the Lords ... (nothing new there). What I want to do is delete that app completely from my itunesconnect account. I don't know what apple recently changed but in the past once the app was rejected I use to see a "delete" button on the su...

I want to remove my app, which is currently marked "Ready for sale", from the App Store. I could not find any documentation on this, and there is no "Remove from Sale" option in the "Manage Your Apps" section of iTunes Connect. Can anyone guide me on how I can remove my app from the App Store? ...

I have changed the name of an app in Django by renaming its folder, imports and all its references (templates/indexes). But now I get this error when I try to run python manage.py runserver ...

...utton inside the free version that takes people to the paid version in the app store. If I use a standard link 25 Answers ...

...s. I currently have a solution to achieve this, however I need to make the app-instance global to be able to access it in the actions. My current setup looks like this: ...