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How to create a protocol with methods that are optional?

...noticed methods marked optional in several protocols defined in the iPhone SDK, such as the UIActionSheetDelegate protocol for example. ...
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App Inventor 2 网络摄像头调用教程 - 通过API查看实时监控画面 · App Inventor 2 中文网

.../iOS aia 源码商店 中文社区 中文教育版 各版本对比 关于 关于我们 发布日志 服务条款 搜索 ...
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数据结构与本地数据库 03:增删改与 TinyDB 恢复 · App Inventor 2 中文网

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How do I convert a byte array to Base64 in Java?

.../ Outputs "Hello" Android (with Java < 8) If you are using the Android SDK before Java 8 then your best option is to use the bundled android.util.Base64. For direct byte arrays: byte[] encoded = Base64.encode("Hello".getBytes()); println(new String(encoded)) // Outputs "SGVsbG8=" byte [] dec...
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What is better: @SuppressLint or @TargetApi?

... T... params) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params); } else { task.execute(params); } } Having @TargetApi(11) means that if Lint detects th...
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Android Studio: Plugin with id 'android-library' not found

...er worked for me I had to install "android support repository" through the SDK Manager! Install it and add the following code above apply plugin: 'android-library' in the build.gradle of actionbarsherlock folder! buildscript { repositories { mavenCentral() } dependencies { ...
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滚动控制使用指导 · App Inventor 2 中文网

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iPhone app signing: A valid signing identity matching this profile could not be found in your keycha

I'm pulling my hair out over this. I just downloaded the iPhone 3.0 SDK , but now I can't get my provisioning profiles to work. Here is what I have tried: ...
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App Inventor 2 接入百度网盘API · App Inventor 2 中文网

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文本框输入十六进制,按字节通过蓝牙发送 · App Inventor 2 中文网

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