How to ignore unnecessary input of Zeros (0) and dot (.) in a calculator app using kotlin/android studio [closed] - string

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1--> Ive been trying to make a calculator app. My problem is that I want my app to ignore unnecessary repeating input by the user to avoid having this kind of repeating zeros(0) and dot(.) : 00000.003, 3..03, 3+00000.003, etc
I'm new here so I don't know what else I could experiment on.
I've tried a combination of while loop with nested ifs with some conditions like text.startsWith, .endsWith("str", ignorecase: false) something like that for my onclick buttons.
Some code suggestions is highly appreciated.
2-->Also i've been thinking if there's a series of command/code where an individual textview will be created every time characters(created by onclick buttons) formed an integer/expression/decimalnumber(etc) as well as operation(+,-,*,/)
in a way that every number and math operations are separated into textviews(for editing purposes)
I hope someone can give me an idea and codes/commands that I might try to experiment with to develop my app

Answer 1

<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />
or
In this sample code, the text in the EditText is first converted to an Int value. If the conversion fails (that is, there is no numeric value in the text box), 0 is set by default. Next, the EditText's text is replaced with the numeric value with the redundant 0's removed.
val editText: EditText = findViewById(R.id.editText)
val number: Int = editText.text.toString().toIntOrNull() ?: 0
editText.setText(number.toString())
allows only text values ​​to be entered
val editText: EditText = findViewById(R.id.editText)
editText.filters = arrayOf(InputFilter { source, _, _, _, _, _ ->
if (source.toString().matches(Regex("[0-9]+"))) {
source
} else {
""
}
})