Any suggestion how to have an EditText that receiving user input around 9 letters (or digits) and after finish (e.g: click some button action or lost keyboard focus), it'll update the letters inside that EditText. Following are the requirements:
Input: 123456789
Output:
123
456
789
Please confirm if this is what you want to achieve?
There's
EditText, you want thatEditTextable to add newline (multiline) for every 3 character (after a simple actions)
If yes, here's an opinionated solutions that might solve the underlying problems:
The above screenshot is written in here
For the EditText part, what we can think of at the moment:
See Core-KTX extensions from here
// YourActivity.kt
import androidx.core.widget.doAfterTextChanged
import kotlin.text.buildString // this import is optional. to identify its origin
override fun onCreate(...) {
// assign your `editText` & `textView` variable with usual `findViewById` or using `ViewBinding` if your project already using it
// Directly listen for user input in EditText
editText?.doAfterTextChanged { userInput ->
if (userInput.length == 3) textView?.text = "$userInput\n"
}
// Or you can use the below approach:
textView.text = buildString {
editText?.toString()?.forEachIndexed { index, letter ->
append(c)
// index start from 0
// index+1 = 0+1, so we can start from 1-index
// check for the reminder of index/3 == 0
// meaning we are appending the `\n` (newline) to the text
if ((index+1) % 3 == 0) append("\n")
}
}
}
// your_activity.xml
<LinearLayout
...
<EditText ... id="@id/editText" />
// create below TextView as a result of user inputs
<TextView ... id="@id/textView" />
/>
A few lines in the above snippet code omitted for readability, and yes there's a few code will compile-error as well, needs to adjust it accordingly
