Android-逗号作为数字键盘上的小数点分隔符 [英] Android - Comma as decimal separator on Numeric Keyboard

问题描述

我们需要一个用于EditText的数字键盘.键盘应根据设备的所选区域设置使用小数点分隔符.我们通过将自定义DigitsKeyListener设置为EditText

We need to have a numeric keyboard for an EditText. The Keyboard should have decimal separator based on the device's selected locale. We implemented this by setting the custom DigitsKeyListener to the EditText

public class NumericDigitsKeyListener extends DigitsKeyListener {


    @Override
    protected char[] getAcceptedChars() {

        char[] acceptedCharacters = null;

            acceptedCharacters =  new char[] {
                    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                    new DecimalFormatSymbols(Locale.getDefaultLocale()).getDecimalSeparator()

        return acceptedCharacters;
    }

    /**
     * @see android.text.method.DigitsKeyListener#getInputType()
     */
    public int getInputType() {
        return InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL;
    }

以上内容对于大多数设备似乎都可以正常工作，但对于Samsung Galaxy S-II，软键盘的键盘上没有逗号.该设备的swype键盘显示逗号，但默认键盘上没有逗号.

The above seems to work fine for most of the devices however for Samsung Galaxy S-II, the softkeyboard does not have comma in the keyboard.Th swype keyboard of the device displays the comma, but the default one does not.

我已经尝试过此处

有没有一种方法可以强制所有设备在数字键盘上都带有逗号(适用时，甚至总是)?

Is there a way I can enforce all the devices to have comma (when applicable or even always) to be there on numeric keyboard?

推荐答案

我认为您的代码与使用以下代码存在相同的问题:

I think that your code has the same problem as using:

android:inputType ="numberDecimal" android:digits ="0123456789，"

android:inputType="numberDecimal" android:digits="0123456789,"

(除了您的代码更通用)

(except that your code is more generic)

问题-据我了解，当 inputType 为 numberDecimal 时，某些键盘只是不尊重 digits 属性.这是一个已记录的错误，也是我发现避免该错误的唯一方法此行为是使用 inputType ="text" 并设置输入过滤器以限制字符.当然，键盘不适用于数字，但找不到更好的解决方案.过滤器将是这样的:

The problem - as I understand, is that some keyboards just don't respect digits property when inputType is numberDecimal. This is a documented bug and the only way I found to avoid this behaviour is to use inputType="text" and set a input filter to restrict characters. Of course, the keyboard isn't proper for numbers but couldn't find a better solution. The filter would be something like this:

mEditText.setFilters(new InputFilter[] { new DecimalInputFilter() });


public class DecimalInputFilter implements InputFilter {

    private static final String ALLOWED_CHARS = "0123456789,";

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        if (source instanceof SpannableStringBuilder) {
            final SpannableStringBuilder sourceAsSpannableBuilder = (SpannableStringBuilder)source;
            for (int i = end - 1; i >= start; i--) { 
                final char currentChar = source.charAt(i);
                 if (!StringUtils.contains(ALLOWED_CHARS, currentChar)) {    
                     sourceAsSpannableBuilder.delete(i, i+1);
                 }     
            }
            return source;
        } else {
            final StringBuilder filteredStringBuilder = new StringBuilder();
            for (int i = 0; i < end; i++) { 
                final char currentChar = source.charAt(i);
                if (StringUtils.contains(ALLOWED_CHARS, currentChar)) {    
                    filteredStringBuilder.append(currentChar);
                }     
            }
            return filteredStringBuilder.toString();
        }
    }
}

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