[Ethereum] How to redirect from browser to Metamask or similar app like trustwallet on android

I'm struggling with the same exact issue myself. In the past, I've managed to achieve this by creating an instance of web3 on the react-native application. Doing so, I was able to perform and sign transactions locally on the phone, making use of a Keystore file on a static location of the phone. From my experience, this eventually became really slow and react-native+web3js (I followed this link as a helper if I remember correctly) didn't work 100% well together. So now I'm trying different approaches, like using webview tags to make use of a browser inside your react native app. So, if you want, give it a try with the web3+RN, maybe you are luckier than me and it ends up working as expected with you. Hope this helps.

It seems that the problem was brought about by the Trust wallet itself and after upgrading to the latest version (4.9 on android), the issue is now solved and everything works as expected.