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    Blocks
                                                                                                             Button
                                                                                          Backpack

                          Built-in Blocks

                           Components                                       Workspace
                             Blocks

                                                                                              Trash

                     Following are the main parts of the Block Editor:

                       Built-in  Blocks:  It contains  all the  predefined  blocks  in the  application.  They are
                       responsible for handling operations like Math, Text, Logic and Control.

                       Component Blocks: It contains relevant blocks for the components we have added in
                       the Design window.
                       Workspace: It arranges all the blocks for coding in the workspace.
                       Trash: It is used for deleting blocks that are not required.

                       Backpack: It stores the copy of all the blocks even when we exit App Inventor.

                     Making Click Event for Button

                     To making click event for button, follow the given steps:
                     Step  1   Click on the Talking_Me button.

                     Step  2   Drag and drop When Talking_Me.Click do block on the workspace.

                     This is an Event Handler block that will handle what happens when the button on your
                     app is clicked.

                                                                                     Introduction to Mobile Apps and MIT  87

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