Code example for DigitsKeyListener

0
        super(context, prompt);
 
        mAnswer.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
 
        // only allows numbers and no periods 
        mAnswer.setKeyListener(new DigitsKeyListener(true, true));
 
        // only 15 characters allowed 
        InputFilter[] fa = new InputFilter[1];
        fa[0] = new InputFilter.LengthFilter(15);
        mAnswer.setFilters(fa);
 
        Double d = getDoubleAnswerValue();
 
        // apparently an attempt at rounding to no more than 15 digit precision??? 
        NumberFormat nf = NumberFormat.getNumberInstance();
        nf.setMaximumFractionDigits(15);
        nf.setMaximumIntegerDigits(15);
        nf.setGroupingUsed(false);
        if (d != null) {
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