Fix Kotlin Login Button Not Working in Android App

If your Kotlin Android login button is not responding when clicked, the problem could be due to common mistakes in your code or layout. This article provides a complete guide to help you debug and fix the issue efficiently. From checking the XML onClick binding to verifying activity lifecycle or view binding usage, we’ll cover all necessary steps.

Before jumping into the fix, make sure your Kotlin Android project is correctly set up with View Binding or findViewById(). Additionally, always check your setOnClickListener implementation inside the onCreate() function. A broken reference or a misplaced listener can cause the login button to appear unresponsive.

Common Causes of Login Button Not Responding:

• setOnClickListener not properly attached
• UI thread is blocked
• View Binding is not initialized
• Button is disabled or hidden
• Click event not reaching the button due to layout overlays

How to Fix the Issue (with Complete Kotlin Code)

1. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="24dp">

    <EditText
        android:id="@+id/etUsername"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Username"/>

    <EditText
        android:id="@+id/etPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:inputType="textPassword"/>

    <Button
        android:id="@+id/btnLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>
</LinearLayout>

2. MainActivity.kt

package com.example.loginapp

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.example.loginapp.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Initialize view binding
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        // Set the click listener
        binding.btnLogin.setOnClickListener {
            val username = binding.etUsername.text.toString()
            val password = binding.etPassword.text.toString()

            if (username == "admin" && password == "1234") {
                Toast.makeText(this, "Login Successful", Toast.LENGTH_SHORT).show()
            } else {
                Toast.makeText(this, "Invalid Credentials", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

Bonus Tip:

If you’re not using View Binding, use findViewById like this:

val btnLogin = findViewById<Button>(R.id.btnLogin)
btnLogin.setOnClickListener { /* your code */ }

By following the correct implementation using ViewBinding and checking for UI issues like overlay or disabled states, your Kotlin login button should work as expected. For further enhancement, consider exploring Android official ViewBinding documentation for a deeper understanding.