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AppInventor2实现蓝牙开启提醒，当蓝牙未开启时弹窗提醒用户开启蓝牙 - 创...
1、代码如下：
当蓝牙未启用时，会自动弹出交互框，让用户选择启用手机蓝牙。
当蓝牙已启用时，这2个代码块将没有任何效果（不提醒也不报错）。
2、也可加一个判断，代码如下：
3、蓝牙开启提醒的交互效果如...
首次打开app时，提示打开蓝牙权限，打开后点击开始搜索，设备列表没有显示...
...由 fun_hcf 于 2025-08-11 09:48 编辑
首次打开app时，提示打开蓝牙权限，打开后点击开始搜索，设备列表没有显示蓝牙设备，而且app卡住了点不动，后面需要先在手机系统设置先打开蓝牙，然后启动app才能搜索到设备，请问大家这个...
蓝牙客户端组件：为什么不显示蓝牙设备列表？为啥蓝牙列表为空 - App Inven...
转会员提问：蓝牙客户端组件：为什么不显示蓝牙设备列表？为啥蓝牙列表为空？
解决方法：设置中打开 app 的“附近设备权限”即可。
What encoding/code page is cmd.exe using?
When I open cmd.exe in Windows, what encoding is it using?
6 Answers
6
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GoPrint aia源码 UI界面现代、代码不复杂，参考性强 - .aia 案例源码 - 清...
屏幕数量：6个，UI界面现代、代码不复杂，参考性强。
需要连接蓝牙硬件进行通信，具体逻辑请自行研究。
【解决】Error 515: Not connected to a Bluetooth device. - 创客硬件开发...
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。
Android 4.3 Bluetooth Low Energy unstable
...w Energy (testing on the Nexus 4). After getting started with the official BLE APIs in Android 4.3, I have noticed that after I connect a device for the first time I am rarely able to successfully connect to / communicate with that device or any other device again.
...
What does collation mean?
...need to be sorted as if they were different letters - e.g. e,ë,é,ě, and è might be distinct letters for the purposes of ordering (but possibly the same letter when searching, damn those crazy Europeans ;)).
– Piskvor left the building
Dec 27 '10 at 12:59
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[SOLVED] Can't send payload > 23bytes(MTU setted to 128bytes) - #9 by ...
...cheme is dark */
/* user picked a theme a light scheme and also enabled a dark scheme */
/* deal with light scheme first */
@media (prefers-color-scheme: light) {
:root {
--primary: #222222;
--secondary: #ffffff;
--tertiary: #008...
Setting the correct encoding when piping stdout in Python
...at you receive, and encode what you send.
# -*- coding: utf-8 -*-
print u"åäö".encode('utf-8')
Another didactic example is a Python program to convert between ISO-8859-1 and UTF-8, making everything uppercase in between.
import sys
for line in sys.stdin:
# Decode what you receive:
lin...