How to EditText limit number range Android kotlin
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// apply edit text input filter number range
editText.inputFilterNumberRange(6..90)
// show the rule
textView.text = "Input number range 6 to 90"
textView.append("\n\nIf user put less than minimum then it set to minimum.")
}
}
// extension function to filter edit text number range
fun EditText.inputFilterNumberRange(range: IntRange){
filterMin(range.first)
filters = arrayOf<InputFilter>(InputFilterMax(range.last))
}
// class to input filter maximum number
class InputFilterMax(private var max: Int) : InputFilter {
override fun filter(
p0: CharSequence,p1: Int,p2: Int,p3: Spanned?,p4: Int,p5: Int
): CharSequence? {
try {
val replacement = p0.subSequence(p1, p2).toString()
val newVal = p3.toString().substring(0, p4) + replacement + p3.toString()
.substring(p5, p3.toString().length)
val input = newVal.toInt()
if (input <= max) return null
} catch (e: NumberFormatException) { }
return ""
}
}
// extension function to filter edit text minimum number
fun EditText.filterMin(min: Int){
onFocusChangeListener = View.OnFocusChangeListener { view, b ->
if (!b) {
// set minimum number if inputted number less than minimum
setTextMin(min)
// hide soft keyboard on edit text lost focus
context.hideSoftKeyboard(this)
}
}
setOnEditorActionListener { v, actionId, event ->
if (actionId == EditorInfo.IME_ACTION_DONE) {
// set minimum number if inputted number less than minimum
setTextMin(min)
// hide soft keyboard on press action done
context.hideSoftKeyboard(this)
}
false
}
}
// extension function to set edit text minimum number
fun EditText.setTextMin(min: Int){
try {
val value = text.toString().toInt()
setUnderlineColor(Color.GREEN)
if (value < min){
setText("$min")
setUnderlineColor(Color.RED)
}
}catch (e: Exception){
setUnderlineColor(Color.RED)
setText("$min")
}
}
// extension function to hide soft keyboard programmatically
fun Context.hideSoftKeyboard(editText: EditText){
(getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager).apply {
hideSoftInputFromWindow(editText.windowToken, 0)
}
}
// extension function to set/change edit text underline color
fun EditText.setUnderlineColor(color: Int){
background.mutate().apply {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
colorFilter = BlendModeColorFilter(color, BlendMode.SRC_IN)
}else{
setColorFilter(color, PorterDuff.Mode.SRC_IN)
}
}
}
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"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
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:inputType="number"
android:padding="12dp"
android:textSize="30sp"
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" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:fontFamily="sans-serif-condensed-medium"
android:gravity="center"
android:padding="8dp"
android:textColor="#4F42B5"
android:textSize="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:text="TextView" />
</androidx.constraintlayout.widget.ConstraintLayout>
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