如何在Android中打印带有两位小数的双精度数? [英] How to print a double with two decimals in Android?

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问题描述

也许这是一个愚蠢的问题,但如果不是创建方法,我无法猜测如何解决它.也许有一种自然的方式"可以做到这一点,例如在 C 中.问题来了:

Maybe this is a silly question, but I cannot guess how to solve it if it's not creating a method. Maybe there's a "natural way" to do it, like in C for example. Here's the problem:

我有一个变量:

double a;

我只想用 2 或 3 位小数显示它.当我尝试展示它时:

And I want to show it only with 2 or 3 decimals. When I try to show it:

Text.setText("Value of a: " + String.valueOf(a));

它给出了类似的东西:

a 的值:5.234966145

Value of a: 5.234966145

我只想

a 的值:5.23

在不改变 a 的实际值的情况下,它显示的是近似数,但适用于实数.

Without changing the real value of a so it shows the approximate number but works with the real number.

推荐答案

yourTextView.setText(String.format("Value of a: %.2f", a));
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