在strings.xml中是否可以有占位符以获取运行时值? [英] Is it possible to have placeholders in strings.xml for runtime values?

问题描述

是否有可能在运行时为值分配 string.xml 中的字符串值中的占位符?

Is it possible to have placeholders in string values in string.xml that can be assigned values at run time?

示例:

一些字符串 PLACEHOLDER1 一些其他字符串

推荐答案

格式和样式

是的，请参见字符串资源:格式和样式设置

如果需要使用 String.format(String，Object ...)格式化字符串，则可以通过将format参数放入字符串资源中来进行格式化.例如，使用以下资源:

If you need to format your strings using String.format(String, Object...), then you can do so by putting your format arguments in the string resource. For example, with the following resource:

<string name="welcome_messages">Hello, %1$s! You have %2$d new messages.</string>

在此示例中，格式字符串具有两个参数:％1 $ s 是字符串，而％2 $ d 是十进制数.您可以使用来自应用程序的参数来格式化字符串，如下所示:

In this example, the format string has two arguments: %1$s is a string and %2$d is a decimal number. You can format the string with arguments from your application like this:

Resources res = getResources();
String text = String.format(res.getString(R.string.welcome_messages), username, mailCount);

基本用法

请注意， getString 具有将字符串用作格式字符串的重载:

Basic Usage

Note that getString has an overload that uses the string as a format string:

String text = res.getString(R.string.welcome_messages, username, mailCount);

复数

如果需要处理复数，请使用以下方法:

Plurals

If you need to handle plurals, use this:

<plurals name="welcome_messages">
    <item quantity="one">Hello, %1$s! You have a new message.</item>
    <item quantity="other">Hello, %1$s! You have %2$d new messages.</item>
</plurals>

第一个 mailCount 参数用于确定要使用的格式(单数或复数)，其他参数则是您的替代:

The first mailCount param is used to decide which format to use (single or plural), the other params are your substitutions:

Resources res = getResources();
String text = res.getQuantityString(R.plurals.welcome_messages, mailCount, username, mailCount);

有关更多详细信息，请参见字符串资源:复数

See String Resources: Plurals for more details.

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