[Solved] how can I do same activity login for these two tables in android

Make only one table eq. tblUser add extra column say something like userType. If user is Doctor then insert 1 else 0 in that column.

While queering back you will get userType of that user. Now you can decide which activity should be open. I have added small pseudo code please understand it carefully.

pseudo code

//some method like this you need to create.
String userType = getUserType()

if(userType == 0) {
    //Open normal user activity    
} else {
    //open doctor activity
}