java - 当数字和百分比窗口为空时，百分比计算器崩溃

Question

当我按“计算”按钮应用程序时崩溃

            @Override
            public void onClick(View view) {

                if (percentageTxt.getText()!=null && numberTxt.getText()!=null){
                float percentege = Float.parseFloat(percentageTxt.getText().toString());
                float dec = percentege / 100;
                float total = dec * Float.parseFloat(numberTxt.getText().toString());
                totalTextWiew.setText(Float.toString(total));
                }else{
                totalTextWiew.setText("Error");
                }

Answer 1

以下解决方案在输入不包含有效浮点的情况下处理空字符串和无效输入。

@Override
    public void onClick(View view) {
        try {
            float percentege = Float.parseFloat(percentageTxt.getText().toString());
            float dec = percentege / 100;
            float total = dec * Float.parseFloat(numberTxt.getText().toString());

            totalTextWiew.setText(Float.toString(total));
        } catch (NumberFormatException nfe) {
            totalTextWiew.setText("Error");
        }
    }