Android で ビルド失敗するとき

ライセンスへの同意が完了していない場合の対処

ビルド時にライセンスへの同意が完了していないと怒られた場合に、CLI上で解決する方法。

問題

下記コマンドを実行した際に失敗した。

react-native run-android

エラー内容

FAILURE: Build failed with an exception.                                                            

* What went wrong:                                                                                  
A problem occurred configuring project ':app'.                                                      
> Could not resolve all dependencies for configuration ':app:_debugApk'.                            
   > A problem occurred configuring project 'XXXXX'.                            
      > You have not accepted the license agreements of the following SDK components:               
        [Android SDK Build-Tools 25.0.2].                                                           
        Before building your project, you need to accept the license agreements and complete the installation of the missing components using the Android Studio SDK Manager.                           
        Alternatively, to learn how to transfer the license agreements from one workstation to another, go to http://d.android.com/r/studio-ui/export-licenses.html

対応

下記コマンドで、OK

sdkmanager --license

あとは、表示されるメッセージに従う

help の内容

sdkmanager --licenses [<common args>]

With --licenses, show and offer the option to accept licenses for all
     available packages that have not already been accepted.