有时候需要动态更新字符串，如蓝牙收发文件时候，需要更新收发的数目。

想使用string.xml，但是感觉无法动态更新。

这对这个问题，Android自有解决方案。

参见：http://developer.android.com/guide/topics/resources/string-resource.html

另外见：http://stackoverflow.com/questions/3656371/dynamic-string-using-string-xml/3656409#3656409

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>

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 arguements from your application like this:

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

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>

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.string.welcome_messages,mailCount,mailCount);