Use trusted wallet on Google application that people are using for a long time.. it mean the wallet are useful and legit. Ask your friend which wallet they are using and ask about their experience about it... do not experiment on new things specially when your money is on stake... you might loss everything...
Download count is good indicator also. If app got 1 mil downloads and is still on the market, it clearly shows it was verified before by google or users so it should be safe
.
This is important factor in choosing app to install, app with 5 k download or 15k or even 80 k is risky business.