Separator in android Edittext

Question

What's the best way to insert a - (dash/minus character) after every 9 characters in a android Edittext, starting from the left?

Examples:

=100001111111111111111111111 -> 100001111-111111111-111111111 My attempt, to show that I have tried doing it myself (a comment below asks: "is this homework?":

final int length = string.length();

StringBuilder stringBuilder = new StringBuilder(newStringCapacity);

Answer 1

您可以执行以下操作：

str = str.replaceAll("(.{9})(?!$)", "$1-");

Answer 2

IF you have a definitive number of characters in your EditText , I suggest you use MaskedEditText . Sample usage from it's docs:

Usage

Add xmlns:mask="http://schemas.android.com/apk/res/com.your.app.package" to your layout xml root. You're now ready to use MaskedEditText ! Just add to your layout xml:

<br.com.sapereaude.maskedEditText.MaskedEditText 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    mask:mask="###.###.###-##"
/>

mask element refers to the format you want. For your case, you could use #########-#########-######### .