文本编辑中的行下降 Android Studio

Question

关于如何让 EditText 接收用户输入大约 9 个字母（或数字）并在完成后（例如：单击某些按钮操作或失去键盘焦点）的任何建议，它将更新其中的字母EditText。以下是要求：

输入：123456789

输出：

123 
456 
789

enter image description here

Answer 1

请确认这是否是您想要实现的目标？

There's EditText, you want that EditText able to add newline (multiline) for every 3 character (after a simple actions)

如果是，这里有一个可能解决潜在问题的自以为是的解决方案：

以上截图写在here

对于EditText部分，目前我们能想到的：

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

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