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EditText input filter decimal | Android kotlin

EditText input filter decimal

MainActivity.kt

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

// apply edit text decimal input filter
editText.inputFilterDecimal(
// this values must be positive (0+) unless it throw exception
maxDigitsIncludingPoint = 5,
maxDecimalPlaces = 2
)

textView.text = "Max digits including point : 5"
textView.append("\nMax decimal places : 2")
}
}

// extension function to input filter edit text decimal digits
fun EditText.inputFilterDecimal(
// maximum digits including point and without decimal places
maxDigitsIncludingPoint: Int,
maxDecimalPlaces: Int // maximum decimal places
){
try {
filters = arrayOf<InputFilter>(
DecimalDigitsInputFilter(maxDigitsIncludingPoint, maxDecimalPlaces)
)
}catch (e: PatternSyntaxException){
isEnabled = false
hint = e.message
}
}

// class to decimal digits input filter
class DecimalDigitsInputFilter(
maxDigitsIncludingPoint: Int, maxDecimalPlaces: Int
) : InputFilter {
private val pattern: Pattern = Pattern.compile(
"[0-9]{0," + (maxDigitsIncludingPoint - 1) + "}+((\\.[0-9]{0,"
+ (maxDecimalPlaces - 1) + "})?)||(\\.)?"
)

override fun filter(
p0: CharSequence?,p1: Int,p2: Int,p3: Spanned?,p4: Int,p5: Int
): CharSequence? {
p3?.apply {
val matcher: Matcher = pattern.matcher(p3)
return if (!matcher.matches()) "" else null
}
return null
}
}

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:inputType="numberDecimal"
android:padding="12dp"
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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EditText input filter decimal | Android kotlin

EditText input filter decimal | Android kotlin