Test.java

public class Test extends AppCompatActivity {
    private FirebaseFirestore yourDB;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        yourDB = FirebaseFirestore.getInstance();
    }
    
    @Override
    public void onStart(){
        super.onStart();
    
        yourDB.collection("Doctors").document("abc@xyz.com").get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
        
        @Override
        public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        
            if(task.isSuccessful()){
                DocumentSnapshot doc = task.getResult();
           
                //set name next to Name TextView
                (editText1.setText(doc.getString("Name"));
            
                //set email next to Email TextView
                (editText2.setText(doc.getString("Email"));
                //convert contact field from number to String               
                //set contact next to Contact TextView
                (editText3.setText(doc.getLong("Contact").toString());
            
                //similarly get all the other fields}
            }
        })
        .addOnFailureListener(new OnFailureListener() {
        
            @Override
            public void onFailure(@NonNull Exception e) {
                //print e.message();
            }
        });
    }
}