package com.arslan6015.firebaseauthusingphoneno; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import com.google.firebase.auth.FirebaseAuth; public class ProfileActivity extends AppCompatActivity { FirebaseAuth firebaseAuth; Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_profile); firebaseAuth = FirebaseAuth.getInstance(); button = findViewById(R.id.SignOut); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { firebaseAuth.signOut(); Intent intent = new Intent(ProfileActivity.this,MainActivity.class); startActivity(intent); } }); } }