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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...外的开销，一般用于安全性、可靠性要求高的场景，比如支付。
RetainFlag：保留消息
保留消息定义：如果PUBLISH消息的RETAIN标记位被设置为1，则称该消息为“保留消息”。
Broker对保留消息的处理：Broker会存储每个...
App Inventor 2 条码与二维码教程 - 生成、扫描与实战应用 · App Inventor 2 中文网
... 概述
条码/二维码在App中广泛用于信息传递、支付、签到等场景。App Inventor 2提供了条码扫描组件和多种二维码扩展。
已有文档：extensions/QRCodeGenerator.md 介绍了二维码生成扩展。本文补充扫描功能和综合实战。
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终于不用拿复选框凑了：App Inventor 新组件「单选框」，问卷表单一个搞定 ...
摘要：性别、支付方式、单选题——只能选一个的场景太多了。App Inventor 原来只有复选框，想做单选得自己写互斥逻辑。现在有了「单选框」组件：选项用逗号一填，点一个其它自动取消。
复选框凑单选，有多麻烦
以前做...
Programmatically obtain the Android API level of a device?
...can obtain API level programatically by the system constant (Build.VERSION.SDK_INT). For example you can run some piece of code which requires newer API in the following way (it will execute if the current device's API level is at least 4)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.DONUT) ...
Setting ANDROID_HOME enviromental variable on Mac OS X
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Where the Android-SDK is installed depends on how you installed it.
If you downloaded the SDK through their website and then dragged/dropped the Application to your Applications folder, it's most likely here:
/Applications/ADT/sdk (as it i...
adb command not found
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could try ~/Library/Android/sdk/platform-tools/adb
– Pnar Sbi Wer
Apr 5 '18 at 2:29
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Bad class file magic or version
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Ok, my bad.
In the Project SDK section, when you add an Android SDK you should provide the Java SDK and all my Android SDKs uses Java 8 as SDK so it create the class files with the wrong version even if the Project level is 1.7 (i don't know why, i sup...
How do you install an APK file in the Android emulator?
...y starts installing.
Another options:
Windows:
Execute the emulator (SDK Manager.exe->Tools->Manage AVDs...->New then Start)
Start the console (Windows XP), Run -> type cmd, and move to the platform-tools folder of SDK directory.
Paste the APK file in the 'android-sdk\tools' or 'p...
Get Android API level of phone currently running my application [duplicate]
...e about all versions possible (back to original Android version), as in minSdkVersion is set to anything less than 4, then you will have to use android.os.Build.VERSION.SDK, which is a String that can be converted to the integer of the release.
If you are on at least API version 4 (Android 1.6 Donu...
Android ADB device offline, can't issue commands
...dated to Android 4.2.2.
The thing that fixed it for me was to upgrade the SDK platform-tools to r16.0.1. For me, this version was not displayed in my SDK Manager, so I pulled it down from http://dl.google.com/android/repository/platform-tools_r16.0.1-windows.zip directly.
You then need to rename t...