Custom component MainActivity

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.ercnksgl.customcomponent.MainActivity">

    <com.ercnksgl.customcomponent.custom.CustomEditText
        android:id="@+id/customEditText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:theme="@style/CustomEditTextTheme"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:startIcon="@mipmap/ic_launcher"
        android:title="@string/title_text" />

</androidx.constraintlayout.widget.ConstraintLayout>