java - 如何修复android中编辑文本的 double 值的最小值和最大值？

Question

我已经提到了这个link

设置允许输入的编辑文本的最小值和最大值。但我想将最小值和最大值固定为双值。最小值应允许从 0.25 开始输入，最大值应允许输入 1000.0。如何解决？

Answer 1

您可以使用输入过滤器。这是我的解决方案

public class MinMaxInputFilter implements InputFilter {
    private double mMinValue;
    private double mMaxValue;

    private static final double MIN_VALUE_DEFAULT = Double.MIN_VALUE;
    private static final double MAX_VALUE_DEFAULT = Double.MAX_VALUE;

    public MinMaxInputFilter(Double min, Double max) {
    this.mMinValue = (min != null ? min : MIN_VALUE_DEFAULT);
    this.mMaxValue = (max != null ? max : MAX_VALUE_DEFAULT);
    }

    public MinMaxInputFilter(Integer min, Integer max) {
    this.mMinValue = (min != null ? min : MIN_VALUE_DEFAULT);
    this.mMaxValue = (max != null ? max : MAX_VALUE_DEFAULT);
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
    try {
        String replacement = source.subSequence(start, end).toString();
        String newVal = dest.subSequence(0, dstart).toString() + replacement
            + dest.subSequence(dend, dest.length()).toString();

        // check if there are leading zeros
        if (newVal.matches("0\\d+.*"))
        if (TextUtils.isEmpty(source))
            return dest.subSequence(dstart, dend);
        else
            return "";

        // check range
        double input = Double.parseDouble(newVal);
        if (!isInRange(mMinValue, mMaxValue, input))
        if (TextUtils.isEmpty(source))
            return dest.subSequence(dstart, dend);
        else
            return "";

        return null;
    } catch (NumberFormatException nfe) {
        LOGE("inputfilter", "parse");
    }
    return "";
    }

    private boolean isInRange(double a, double b, double c) {
    return b > a ? c >= a && c <= b : c >= b && c <= a;
    }
}

如何使用:

   editText.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);

   InputFilter limitFilter = new MinMaxInputFilter(mMinValue, mMaxValue);
   editText.setFilters(new InputFilter[] { limitFilter });