Products Google for Education Blockly Reference com.google.blockly.android.ui.mutator Classes IfElseMutatorFragment Standard fragment UI for editing an if-else block. ProcedureDefinitionMutatorFragment Standard UI fragment for editing the ProcedureDefinitionMutator attached to procedures_defnoreturn and procedures_defreturn blocks. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated January 25, 2019.