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how to fix design editor is unavailable until successful build android

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Android CardView Example

https://youtu.be/60i3RKBR3L8

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https://youtu.be/HlhxcHsVmpc

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https://youtu.be/bsLedS0B0Hs

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ANDROID EMAIL ADDRESS VALIDATION EXAMPLE

https://youtu.be/MHV4piLh-I8

android.util.Patterns.EMAIL_ADDRESS.matcher(e.getText().toString()).matches()