hello sir I need help I am making a new builder
I change a block style not change a color
but not find out block style java file plz help me
I think you need to change the whole blockly SDK I am not sure let
@ewpatton answer that 
@MohamedTamer can also have a look
The block styles are not defined in Java. They are provided by Blockly. If you want to make modifications, you'll need to edit the files in lib/blockly/core/.
Hi @superboy welcome to App Inventor Community,
As per my understanding, you are looking for a custom block renderer but App Inventor isn't on the latest version of Blockly, so custom renderers aren't currently supported.
but you can enable HAT of the block by changing
Blockly.BlockSvg.START_HAT to true in block_svg.js .
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