Hey Developer, From A Long Time I Am An Issue With Custom Font. Actually When My Screen Is Initializing I Found My All Custom Fonts Are Not Applied But After A Few Milliseconds It Applying Automatically. Why This Happening And How To Avoid It.
I would like to recommend you to add some splash screen using some arrangement in your screen, and then you can show your main screen after sometime meanwhile your font will be loaded
.ttf File uploaded to builder assets. Also default material icons taking time too. Some this issue closing application automatically if network become slow.