android中格式为＃。＃的Java小数问题

Question

I have used this following code to get the decimal format and set it to edit text.

DecimalFormat decimalFormat = new DecimalFormat("#.#");
editSoilDepth.setText(decimalFormat.format(5.58f));

If I do so it will give me out put as: 5.9 but i do not want to replace the decimal first value and want to print as 5.5

How can i do so?

Any suggestion will be appreciated.

Answer 1

在使用DecimalFormat之前添加此行：

df.setRoundingMode(RoundingMode.DOWN);

Answer 2

DecimalFormat decimalFormat = new DecimalFormat("#.#");
        decimalFormat.setRoundingMode(RoundingMode.DOWN);

        decimalFormat.format(5.58f);

Answer 3

试试这个吧

double roundOff = Math.round(a * 10.0) / 10.0;