java无法将字符串转换为Int进行求和

Question

我在Android Studio中有以下代码

public void addTotal() {
    String sub1 = subtotal1.getText().toString();
    String newSub1 = sub1.replace("$", "");
    String sub2 = subtotal2.getText().toString();
    String newSub2 = sub2.replace("$", "");
    String sub3 = subtotal3.getText().toString();
    String newSub3 = sub3.replace("$", "");

    totalAmt.setText(newSub1 + newSub2 + newSub3);
}

我无法将它们作为整数相加。我错过什么了吗

subtotal1、subtotal2、subtotal3在应用程序中TextView

Answer 1

假设您的文本美元金额可能有一个小数部分，您可以在此处使用Double#parseDouble：

public void addTotal() {
    String sub1 = subtotal1.getText().replace("$", "");
    String sub2 = subtotal2.getText().replace("$", "");
    String sub3 = subtotal3.getText().replace("$", "");

    Double total = Double.parseDouble(sub1) + Double.parseDouble(sub2) +
                   Double.parseDouble(sub3);
    totalAmt.setText("$" + String.valueOf(total));
}