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怎么从MQTT Topic接收的信息中解析出，然后查找想用的键值，让键值中的数据...
...接收的信息 解析成JSON 然后查找对应的键值 将数据显示到文本上https://bbs.tsingfun.com/thread-1813-1-1.html
把json换成你的topic就行了。
遇到问题的话，每一步的变量都打印出来看看，找到哪一步的问题。
谢谢谢谢分享灰常不错
Python编程：从入门到实践（第3版）.pdf - Python - 清泛IT社区，为创新赋能！
Python编程：从入门到实践（第3版）.pdf
如何把用户设定的数字，发送到mqtt中？ - App Inventor 2 中文网 - 清泛IT...
如图，请问，如何把用户输入的数字，发送到mqtt服务器？Message 后面的代码块改为：文本输入框1.文本还是不行baiheren 发表于 2025-03-24 17:07
还是不行
具体的表现是？
有具体的报错信息吗？
How to copy files from 'assets' folder to sdcard?
...(filename.endsWith(".jpg")) // extension was added to avoid compression on APK file
newFileName = TARGET_BASE_PATH + filename.substring(0, filename.length()-4);
else
newFileName = TARGET_BASE_PATH + filename;
out = new FileOutputStream(newFileName);
b...
How can I record a Video in my Android App.?
...="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<SurfaceView
android:id="@+id/surface_camera"
android:layout_width="match_parent"
a...
Set the absolute position of a view
...ontainer:
XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root"
android:background="#33AAFF"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameL...
What is the best IDE to develop Android apps in? [closed]
...my opinion. Plus I'm a big IntelliJ fan. The IntelliJ plugin lets you make apk files and push the app to the emulator, that's all you need for Android app development. I'd say you're safe sticking with IntelliJ.
Update: there is now an official free IDE for IntelliJ android dev! http://blogs.jetbra...
Android ViewPager - Show preview of page on left and right
...ndroidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" <-- this!
app:cardCornerRadius="8dp"
app:cardUseCompatPaddin...
Get application version name using adb
...
If you don't want install *.apk on device but you need get version of app, you can do it as follow
$ANDROID_HOME/build-tools/28.0.3/aapt dump badging app/build/outputs/apk/app.app
...
Show and hide a View with a slide up/down animation
...f-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.slideview.MainActivity">
<Button
...