Button Click handler is not working in Android Studio

Question

Directory structure of my activity is like below

That's why to get the button id, I wrote below code

View rootView = getLayoutInflater().inflate(R.layout.activity_login, null, false);

btnLogin = (Button)rootView.findViewById(R.id.btnLogin);

But, due to some reasons, when I click button, it does not come inside hander. Am I missing something? My code is below.

btnLogin.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    }
});

Complete code of Activity

package com.example.pankajgarg.android.Activities.UserManagement.Auth.Login;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.example.pankajgarg.android.R;

public class LoginActivity extends AppCompatActivity {

    Button btnLogin;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        View rootView = getLayoutInflater().inflate(R.layout.activity_login, null, false);

        btnLogin = (Button)rootView.findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(),"Button was Clicked", Toast.LENGTH_SHORT).show();
            }
        });

        setContentView(R.layout.activity_login);
    }
}

Answer 1

The best way you can go about it is by using setContentView(R.layout.activity_login) in your onCreate() method and then pull the button with findViewById(R.id.btnLogin).

protected void onCreate(Bundle savedInstanceState){
   super.onCreate(savedInstanceState);
   //insert this line here
   setContentView(R.layout.activity_login);

  //Pull the button with the id
  btnLogin = (Button) findViewById(R.id.btnLogin);

  //set onclicklistener
  btnLogin.setOnClickListener(new View.OnClickListener(){
   public void onClick(View view){
     Toast.makeText(getApplicationContext(),"Button was Clicked", Toast.LENGTH_SHORT).show();
   }
 });
}