gsrathoreniks

public class MyApplication extends Application {
 //Optional override      
	@Override
	public void onCreate() {
	    super.onCreate();
      // Write initialization logic here!
	}
}

gsrathoreniks

class MyApplication : Application(){
    //Optional override
    override fun onCreate() {
        super.onCreate()
      // Write initialization logic here!
    }

}

gsrathoreniks

<application 
   android:name=".MyApplication"
   android:icon="@drawable/icon" 
   android:label="@string/app_name" 
   ...>

gsrathoreniks

android {
    ...
    buildFeatures {
        viewBinding true
    }
}

gsrathoreniks

<LinearLayout
        ...
        tools:viewBindingIgnore="true" >
    ...
</LinearLayout>

gsrathoreniks

<LinearLayout ... >
    <ImageView android:cropToPadding="true" />
    <TextView android:id="@+id/tvName" />
    <Button android:id="@+id/nextBtn"
        android:background="@drawable/rounded_button" />
</LinearLayout>

gsrathoreniks

private lateinit var binding: ActivityProfileBinding

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //initializing binding
        binding = ActivityProfileBinding.inflate(layoutInflater)
        val view = binding.root
        setContentView(view)
}

gsrathoreniks

private var _binding: FragmentProfileBinding? = null
// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {

gsrathoreniks

package `in`.gsrathoreniks.validationdemo

import android.annotation.SuppressLint
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.google.android.material.button.MaterialButton
import com.google.android.material.textfield.TextInputEditText

class MainActivity : AppCompatActivity() {

gsrathoreniks

package `in`.gsrathoreniks.validationdemo

import androidx.appcompat.widget.AppCompatEditText
import java.util.regex.Pattern

object ValidationUtil {

    fun isValidUsername(view: AppCompatEditText, username: String?, regex: String = "^[a-zA-Z0-9._-]{3,20}$"): Boolean {
        view.requestFocus()
        when {