如何自动添加千位分隔符的数量是输入的EditText [英] How to Automatically add thousand separators as number is input in EditText

问题描述

林创建转换器应用，我想设置的EditText使得当用户输入要转换的数字，一个千符（，）应automaticaaly实时加到数一旦increaments由3位数字。 ....千，万，十亿等 并且当擦除到4以下附图的数目返回到正常。 任何帮助吗？ 谢谢你。

Im creating a convertor application, I want to set the EditText so that when the user is inputting the number to be converted, a thousand separator (,) should be added automaticaaly in realtime to the number once it increaments by 3 figures.....thousand, million, billion etc and when erased to below 4 figures the number goes back to normal. Any help? Thank You.

推荐答案

您可以使用的String.Format（）的<一个href="http://developer.android.com/reference/android/text/TextWatcher.html#afterTextChanged%28android.text.Editable%29"><$c$c>TextWatcher. 格式说明逗号的伎俩。

这不适用于浮点输入工作。并注意不要设置无限循环的TextWatcher。

This does not work for floating point input. And be careful not to set an infinite loop with the TextWatcher.

public void afterTextChanged(Editable view) {
    String s = null;
    try {
        // The comma in the format specifier does the trick
        s = String.format("%,d", Long.parseLong(view.toString()));
    } catch (NumberFormatException e) {
    }
    // Set s back to the view after temporarily removing the text change listener
}

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