离子：不能建立Android应用

Question

我试图建立使用inonic build android一个Android应用程序，但我有以下错误：

running cordova build android 
Running command: "c:\Program Files\nodejs\node.exe" c:\xampp\htdocs\discipulado\ 
discipulado\hooks\after_prepare\010_add_platform_class.js c:/xampp/htdocs/discip 
ulado/discipulado 
add to body class: platform-android 
Running command: c:\xampp\htdocs\discipulado\discipulado\platforms\android\cordo 
va\build.bat 
[Error: Please install Android target: "android-21". 

Hint: Open the SDK manager by running: C:\Users\Thiago\AppData\Local\Android\sdk 
\tools\android.BAT 
You will require: 
1. "SDK Platform" for android-21 
2. "Android SDK Platform-tools (latest) 
3. "Android SDK Build-tools" (latest)] 
ERROR building one of the platforms: Error: c:\xampp\htdocs\discipulado\discipul 
ado\platforms\android\cordova\build.bat: Command failed with exit code 2 
You may not have the required environment or OS to build this project 
Error: c:\xampp\htdocs\discipulado\discipulado\platforms\android\cordova\build.b 
at: Command failed with exit code 2 
    at ChildProcess.whenDone (c:\Users\Thiago\AppData\Roaming\npm\node_modules\c 
ordova\node_modules\cordova-lib\src\cordova\superspawn.js:131:23) 
    at ChildProcess.emit (events.js:110:17) 
    at maybeClose (child_process.js:1015:16) 
    at Process.ChildProcess._handle.onexit (child_process.js:1087:5) 

我已经安装了Apache Ant的，但仍然是错误。我删除了Android平台ionic platform remove android并添加了ionic platform add android没有成功。

有什么想法？

UPDATE 我已经安装了Android Studio和Android SDK工具。

Answer 1

由于错误提示，你的系统需要安装“机器人-21”，这就是Android 5.0棒棒糖