这行android代码有什么问题? [英] What is wrong with this line of android code?

问题描述

answer.setText(Double.toString(calculate(firstUnit.getSelectedItem().toString(), secondUnit.getSelectedItem().toString(), Double.parseDouble(unitSize.getText().toString()))));

这是

Here is

public double calculate(String unit1, String unit2, double d){
    return 1.23;
}

它给出了数字格式异常，而1.23只是我出于测试目的给出的数字.假定答案是textview，并且firstUnit和secondUnit是Spinners，unitSize是edittext小部件.

It gives a number format exception and 1.23 is just a number i gave for testing purposes. Assume that answer is a textview, and firstUnit and secondUnit are spinners and unitSize is an edittext widget.

推荐答案

如果给定参数失败，我敢打赌它是一个.请尝试格式化您的代码，如下所示:

I bet it''s one if the given arguments that fail. Please try to format your code like this:

double dUnitSize = Double.parseDouble(unitSize.getText().toString());
double dValue = calculate(
      firstUnit.getSelectedItem().toString(),
      secondUnit.getSelectedItem().toString(),
      dUnitSize
);
answer.setText(dValue);

您很快就会发现问题所在.

you''ll soon find out which line the problem is.

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