在EditText中舍入小数

Question

我试图弄清楚如何将总数四舍五入到小数点后两位.总计是EditText.我不能把它缩小到只有两位小数.怎么了？谢谢你的帮助.

public void macro() {
    caloriesTotal = Double.parseDouble(calories.getText().toString());
    total = (caloriesTotal * .20)/9;
    DecimalFormat round = new DecimalFormat ("###.##");
    round.format(total);
    carbsTotal = (caloriesTotal * .40)/4;
    proteinTotal = (caloriesTotal * .40)/4;       
    fat.setText(Double.toString(total));
    carbs.setText(Double.toString(carbsTotal));
    protein.setText(Double.toString(proteinTotal));
}

Answer 1

试试这个.

fat.setText(Double.valueOf(round.format(total)));

当您将任何数字转换为N个十进制数字时,您需要将该值存储在任何变量中或直接显示如上所述.