MainActivity.kt
package com.example.jetpack
import android.os.Bundle
import android.text.InputFilter
import android.widget.EditText
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// prevent user to enter first space on edit text
// user can input space after entering any other character
editText.ignoreFirstWhiteSpace()
}
}
// ignore entering first space on edit text
// extension function to prevent input first space on edit text
fun EditText.ignoreFirstWhiteSpace() {
val filter = InputFilter { source, start, end, dest, dstart, dend ->
for (i in start until end) {
if (Character.isWhitespace(source[i])) {
if (dstart == 0) return@InputFilter ""
}
}
null
}
filters = arrayOf(filter)
}
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:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FEFEFA"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginEnd="12dp"
android:padding="12dp"
android:textSize="30sp"
android:inputType="text|textVisiblePassword"
android:fontFamily="sans-serif-condensed-medium"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.12" />
</androidx.constraintlayout.widget.ConstraintLayout>

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