Being declared bankrupt is likely to have a significant impact on your ability to get a credit card, but it isn't impossible. There may still be options available to you.
If you're looking to borrow less than £500, then you don't need to inform the lender of your bankruptcy, however any amount over this will need to be declared. This is likely to impact your chances of being accepted as you'll be deemed as more high risk by lenders.
Opting for a lender who specialises in poor credit can help your chances of being accepted. It's important that you repay your credit card in full each month to rebuild your credit score over time.