Android 限制EditText输入小数点后面位数

遇到一需求，要限制EditText小数点输入位数，最后经过查阅资料，实现方法如下：

①xml中限制输入的类型：

android:inputType="numberDecimal"

②重写InputFilter

public class DecimalDigitsInputFilter implements InputFilter {    private final int decimalDigits;    /**     * Constructor.     *     * @param decimalDigits maximum decimal digits     */    public DecimalDigitsInputFilter(int decimalDigits) {        this.decimalDigits = decimalDigits;    }    @Override    public CharSequence filter(CharSequence source,                               int start,                               int end,                               Spanned dest,                               int dstart,                               int dend) {        int dotPos = -1;        int len = dest.length();        for (int i = 0; i < len; i++) {            char c = dest.charAt(i);            if (c == '.' || c == ',') {                dotPos = i;                break;            }        }        if (dotPos >= 0) {            // protects against many dots            if (source.equals(".") || source.equals(","))            {                return "";            }            // if the text is entered before the dot            if (dend <= dotPos) {                return null;            }            if (len - dotPos > decimalDigits) {                return "";            }        }        return null;    }}

③设置小数点位数，这里传进去的是2位

etInvoiceAmount.setFilters(new InputFilter[] {new DecimalDigitsInputFilter(2)});

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