getString Outside of a Context or Activity

Question

I ve found the R string pretty awesome for keeping hardcoded strings out of my code  and I d like to keep using it in a utility class that works with models in my application to generate output  For instance  in this case I am generating an email from a model outside of the activity    Is it possible to use getString outside a Context or Activity  I suppose I could pass in the current activity  but it seems unnecessary  Please correct me if I m wrong   Edit  Can we access the resources without using Context

User · Answer

Unique Approach   App getRes   getString R string some id   This will work everywhere in app   Util class  Dialog  Fragment or any class in your app    1  Create or Edit  if already exist  your Application class  import android app Application  import android content res Resources   public class App extends Application       private static App mInstance      private static Resources res         Override     public void onCreate             super onCreate            mInstance   this          res   getResources               public static App getInstance             return mInstance             public static Resources getRes             return res             2  Add name field to your manifest xml  lt application tag   lt application         android name  quot  App quot                       gt                   lt  application gt   Now you are good to go  Use App getRes   getString R string some id  anywhere in app

User · Answer

Somehow didn t like the hacky solutions of storing static values so came up with a bit longer but a clean version which can be tested as well   Found 2 possible ways to do it-   Pass context resources as a parameter to your class where you want the string resource  Fairly simple  If passing as param is not possible  use the setter    e g   data class MyModel val resources  Resources        fun getNameString    String           resources getString R string someString             Use the data-binding  requires fragment activity though    Before you read  This version uses Data binding  XML-   lt  xml version  1 0  encoding  utf-8   gt    lt layout xmlns android  http   schemas android com apk res android  xmlns app  http   schemas android com apk res-auto  xmlns tools  http   schemas android com tools  gt    lt data gt       lt variable         name  someStringFetchedFromRes          type  String    gt   lt  data gt    lt TextView         android layout width  match parent          android layout height  wrap content          android text    someStringFetchedFromRes     gt   lt  layout gt    Activity Fragment-  val binding   NameOfYourBinding inflate inflater  binding someStringFetchedFromRes   resources getString R string someStringFetchedFromRes    Sometimes  you need to change the text based on a field in a model  So you would data-bind that model as well and since your activity fragment knows about the model  you can very well fetch the value and then data-bind the string based on that

User · Answer

I used  getContext   getApplicationContext   getString R string nameOfString   It works for me

User · Answer

It s better to use something like this without context and activity    Resources getSystem   getString R string my text

User · Answer

In MyApplication  which extends Application   public static Resources resources    In MyApplication s onCreate   resources   getResources      Now you can use this field from anywhere in your application

User · Answer

Unfortunately  the only way you can access any of the string resources is with a Context  i e  an Activity or Service    What I ve usually done in this case  is to simply require the caller to pass in the context

User · Answer

If you have a class that you use in an activity and you want to have access the ressource in that class  I recommend you to define a context as a private variable in class and initial it in constructor   public class MyClass         private Context context       public MyClass Context context          this context context             public testResource           String s context getString R string testString  toString              Making an instant of class in your activity   MyClass m new MyClass this

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This should get you access to applicationContext from anywhere allowing you to get applicationContext anywhere that can use it  Toast  getString    sharedPreferences  etc   The Singleton   package com domain packagename   import android content Context          Created by Versa on 10 09 15      public class ApplicationContextSingleton       private static PrefsContextSingleton mInstance      private Context context       public static ApplicationContextSingleton getInstance             if  mInstance    null  mInstance   getSync            return mInstance             private static synchronized ApplicationContextSingleton getSync             if  mInstance    null  mInstance   new PrefsContextSingleton            return mInstance             public void initialize Context context            this context   context             public Context getApplicationContext             return context             Initialize the Singleton in your Application subclass   package com domain packagename   import android app Application          Created by Versa on 25 08 15      public class mApplication extends Application         Override     public void onCreate             super onCreate            ApplicationContextSingleton getInstance   initialize this             If I  m not wrong  this gives you a hook to applicationContext everywhere  call it with ApplicationContextSingleton getInstance getApplicationContext    You shouldn  t need to clear this at any point  as when application closes  this goes with it anyway   Remember to update AndroidManifest xml to use this Application subclass    lt  xml version  1 0  encoding  utf-8   gt    lt manifest     xmlns android  http   schemas android com apk res android      package  com domain packagename       gt    lt application     android allowBackup  true      android name   mApplication   lt  -- This is the important line -- gt      android label   string app name      android theme   style AppTheme      android icon   drawable app icon       gt    Please let me know if you see anything wrong here  thank you

User · Answer

The best approach from the response of Khemraj   App class  class App   Application          companion object           lateinit var instance  Application         lateinit var resourses  Resources                MARK  - Lifecycle      override fun onCreate             super onCreate           instance   this         resourses   resources            Declaration in the manifest   lt application         android name   App              gt   lt  application gt         Constants class  class Localizations        companion object           val info   App resourses getString R string info             Using  textView text   Localizations info

User · Answer

Yes  we can access resources without using  Context   You can use   Resources getSystem   getString android R string somecommonstuff        everywhere in your application  even in static constants declarations  Unfortunately  it supports the system resources only   For local resources use this solution  It is not trivial  but it works

User · Answer

BTW  one of the reason of symbol not found error may be that your IDE imported android R  class instead of yours one  Just change import android R  to import your namespace R   So 2 basic things to get string visible in the different class     make sure you are importing the right R class import your namespace R     don t forget about the context public void some method Context context       context getString R string YOUR STRING

User · Answer

You can do this in Kotlin by creating a class that extends Application and then use its context to call the resources anywhere in your code  Your App class will look like this   class App   Application         override fun onCreate             super onCreate           context   this            companion object           var context  Context    null             private set           Declare your Application class in AndroidManifest xml  very important    lt application         android allowBackup  true          android name   App     lt --Your declaration Here             gt           lt activity             android name   SplashActivity   android theme   style SplashTheme  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                    lt category android name  android intent category LAUNCHER    gt               lt  intent-filter gt           lt  activity gt            lt activity android name   MainActivity   gt       lt  application gt    To access e g  a string file use the following code  App context  resources  getText R string mystring

[java] getString Outside of a Context or Activity

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