...f the events IncomingCallAnswered, PhoneCallEnded, or PhoneCallStarted are included in the code, the permissions are included in the manifest and, if Android >= 6.0, requested at runtime. Prior to this change, ReceivingEnabled was default Foreground, not Off. Therefore, older tutorials may not wo...

...ations must be assigned to such a channel up from API level 26. Up to and including API Level 25, all information and functions relating to the notification channel are irgnored. The notification concept is quite complex. Android allows settings to be made on the device level as well as on the ch...

...abytes (not to mention that MIT App Inventor requires the app source file, including images, to be less than 5 Megabytes). So the app will simply not work, and the project will get an OutOfMemory exception when it loads. Even if the app could work, the result on the phone would hardly look differ...

...sive design. A common approach to responsive design is to build apps that include multiple layouts and multiple images to accommodate different screen sizes and resolutions. This gives good results, but it makes more work for developers. App Inventor uses a simpler approach, but that approach is ...

... « 返回首页 App Inventor includes an emulator for the phone. The emulator lets you develop and test apps using a virtual phone instead of a real phone. Instead of connecting a phone to the USB port, just start the emulator program. When you click Conn...

...o make hardware programming more accessible. The Kit For sensors, the kit includes one light sensor, some photoresistors, and two ultrasonic sensors. These should suffice for a variety of applications, such as light-following and wall-following. Here is an image of the finished kit: MOIO board (...

... GenerateRsaKeyPair 此方法用于生成一对RSA加密/解密密钥（including a private key and a public key），输入密钥的大小，其单位为bit.it可以是512,1024,2048或4096.密钥越长，它就越安全。当已生成密钥对，该事件OnRsaKeyPairGenerated将触发和传递...

... just as in the last example above, except that the list of pairs will now include an additional pair (content, (happy sad)) where the second item in the additional pair is the list of strings “happy” and “sad”. It is also possible that the XML contains elements with attributes, for example...

...ing multitouch is a popular request, and MIT App Inventor might eventually include it in the system. This note illustrates how to use App Inventor extensions to implement a RotationDetector component that people can use to create apps that react to two-finger rotation gestures. This note is interes...

...ing multitouch is a popular request, and MIT App Inventor might eventually include it in the system. This note illustrates how to use App Inventor extensions to implement a RotationDetector component that people can use to create apps that react to two-finger rotation gestures. This note is interes...