Is it possible to have placeholders in strings xml for runtime values

Question

Is it possible to have placeholders in string values in string xml that can be assigned values at run time   Example      some string PLACEHOLDER1 some more string

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If you want to write percent      duplicate it    lt string name  percent  gt  1 d   lt  string gt   label text   getString R string percent  75     Output  75     If you write simply  1 d   you will get the error  Format string  percent  is not a valid format string so it should not be passed to String format

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You can use MessageFormat    lt string name  customer address  gt Wellcome   0   1  lt  string gt    In Java code    String text   MessageFormat R string customer address  format  Name   Family      API level 1    https   developer android com reference java text MessageFormat html

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In Kotlin you just need to set your string value like this   lt string name  quot song number and title quot  gt  quot  1 d    2 s quot  lt  string gt   Create a text view on your layout   lt TextView android text  quot  string song number and title quot   gt   Then do this in your code if you using Anko  val song   database use      get your song from the database   song number and title setText resources getString R string song number and title  song number  song title      You might need to get your resources from the application context

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Formatting and Styling  Yes  see the following from String Resources  Formatting and Styling     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    lt string name  welcome messages  gt Hello   1 s  You have  2 d new messages  lt  string gt        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      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     Plurals  If you need to handle plurals  use this    lt plurals name  welcome messages  gt       lt item quantity  one  gt Hello   1 s  You have a new message  lt  item gt       lt item quantity  other  gt Hello   1 s  You have  2 d new messages  lt  item gt   lt  plurals gt    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     See String Resources  Plurals for more details

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Was looking for the same and finally found the following very simple solution  Best  it works out of the box  1  alter your string ressource    lt string name  welcome messages  gt Hello   lt xliff g name  name  gt  s lt  xliff g gt   You have   lt xliff g name  count  gt  d lt  xliff g gt  new messages  lt  string gt    2  use string substitution   c getString R string welcome messages name count    where c is the Context  name is a string variable and count your int variable  You ll need to include   lt resources xmlns xliff  http   schemas android com apk res-auto  gt    in your res strings xml  Works for me

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In your string file use this       lt string name  redeem point  gt  You currently have  s points  s points   1  s  lt  string gt    And in your code use as accordingly  coinsTextTV setText String format getContext   getString R string redeem point   rewardPoints getReward points                             rewardPoints getConversion rate    getString R string rs

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Yes  you can do so without writing any Java Kotlin code  only XML by using this small library I created  which does so at buildtime  so your app won t be affected by it  https   github com LikeTheSalad android-string-reference  Usage  Your strings    lt resources gt       lt string name  app name  gt My App Name lt  string gt       lt string name  template welcome message  gt Welcome to   app name  lt  string gt   lt  resources gt    The generated string after building    lt  --resolved xml-- gt   lt resources gt       lt string name  welcome message  gt Welcome to My App Name lt  string gt   lt  resources gt

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When you want to use a parameter from the actual strings xml file without using any Java code    lt  xml version  1 0  encoding  utf-8   gt   lt  DOCTYPE resources      lt  ENTITY appname  WhereDat  gt     lt  ENTITY author  Oded  gt    gt    lt resources gt       lt string name  app name  gt  amp appname  lt  string gt       lt string name  description  gt The  amp appname  app was created by  amp author  lt  string gt   lt  resources gt    This does not work across resource files  i e  variables must be copied into each XML file that needs them

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A Direct Kotlin Solution to the problem   strings xml   lt string name  customer message  gt Hello   1 s  nYou have  2 d Products in your cart  lt  string gt     kotlinActivityORFragmentFile kt   val username    Andrew  val products   1000 val text  String   String format        resources getString R string customer message   username  products

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Supplemental Answer  When I first saw  1 s and  2 d in the accepted answer  it made no sense  Here is a little more explanation   They are called format specifiers  In the xml string they are in the form of    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    Example  We will create the following formatted string where the gray parts are inserted programmatically      My sister Mary is 12 years old    string xml   lt string name  my xml string  gt My sister  1 s is  2 d years old  lt  string gt    MyActivity java  String myString    Mary   int myInt   12  String formatted   getString R string my xml string  myString  myInt     Notes   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

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in res values string xml   lt resources gt       lt string name  app name  gt Hello World lt  string gt       lt string name  my application  gt Application name   s  package name   s lt  string gt   lt  resources gt    in java code  String   args   new String 2   args 0    context getString R string app name   args 1    context getPackageName    String textMessage   context getString R string my application  Object    args

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However  you should also read Elias M  rtenson s answer on Android plurals treatment of    zero     There is a problem with the interpretation of certain values such as  zero

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Kotlin version of the accepted answer     val res   resources val text   String format res getString R string welcome messages   username  mailCount

[android] Is it possible to have placeholders in strings.xml for runtime values?

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