如果你想写百分比(%)，复制它:

<string name="percent">%1$d%%</string>

label.text = getString(R.string.percent, 75) // Output: 75%.

如果你只写%1$d%，你会得到一个错误:格式字符串'percent'不是一个有效的格式字符串，所以它不应该被传递给string . Format。

或者使用格式化=false"代替。

补充回答

当我第一次在接受的答案中看到%1$s和%2$d时，它毫无意义。这里有更多的解释。

它们被称为格式说明符。在xml字符串中，它们的形式是

%[parameter_index$][format_type] 

%: The percent sign marks the beginning of the format specifier. parameter index: This is a number followed by a dollar sign. If you had three parameters that you wanted to insert into the string, then they would be called 1$, 2$, and 3$. The order you place them in the resource string doesn't matter, only the order that you supply the parameters. format type: There are a lot of ways that you can format things (see the documentation). Here are some common ones: s string d decimal integer f floating point number

例子

我们将创建以下格式化字符串，其中灰色部分以编程方式插入。

我妹妹玛丽12岁了。

string.xml

<string name="my_xml_string">My sister %1$s is %2$d years old.</string>

MyActivity.java

String myString = "Mary";
int myInt = 12;
String formatted = getString(R.string.my_xml_string, myString, myInt);

笔记

I could use getString because I was in an Activity. You can use context.getResources().getString(...) if it is not available. String.format() will also format a String. The 1$ and 2$ terms don't need to be used in that order. That is, 2$ can come before 1$. This is useful when internationalizing an app for languages that use a different word order. You can use a format specifier like %1$s multiple times in the xml if you want to repeat it. Use %% to get the actual % character. For more details read the following helpful tutorial: Android SDK Quick Tip: Formatting Resource Strings

在你的字符串文件中使用这个

<string name="redeem_point"> You currently have %s points(%s points = 1 %s)</string>

并在代码中相应地使用

coinsTextTV.setText(String.format(getContext().getString(R.string.redeem_point), rewardPoints.getReward_points()
                        , rewardPoints.getConversion_rate(), getString(R.string.rs)));

如果你想写百分比(%)，复制它:

<string name="percent">%1$d%%</string>

label.text = getString(R.string.percent, 75) // Output: 75%.

如果你只写%1$d%，你会得到一个错误:格式字符串'percent'不是一个有效的格式字符串，所以它不应该被传递给string . Format。

或者使用格式化=false"代替。

你可以使用MessageFormat:

<string name="customer_address">Wellcome: {0} {1}</string>

在Java代码中:

String text = MessageFormat(R.string.customer_address).format("Name","Family");

火力等级1:

https://developer.android.com/reference/java/text/MessageFormat.html

当你想使用实际strings.xml文件中的参数而不使用任何Java代码时:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE resources [
  <!ENTITY appname "WhereDat">
  <!ENTITY author "Oded">
]>

<resources>
    <string name="app_name">&appname;</string>
    <string name="description">The &appname; app was created by &author;</string>
</resources>

这对跨资源文件不起作用，即变量必须复制到每个需要它们的XML文件中。