How can I get a resource content from a static context

Question

I want to read strings from an xml file before I do much of anything else like setText on widgets  so how can I do that without an activity object to call getResources   on

User · Answer

if you have a context  i mean inside    public void onReceive Context context  Intent intent        you can use this code to get resources   context getResources   getString R string app name

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My Kotlin solution is to use a static Application context   class App   Application         companion object           lateinit var instance  App private set            override fun onCreate             super onCreate           instance   this           And the Strings class  that I use everywhere   object Strings       fun get  StringRes stringRes  Int  vararg formatArgs  Any   emptyArray     String           return App instance getString stringRes   formatArgs            So you can have a clean way of getting resource strings  Strings get R string some string  Strings get R string some string with arguments   Some argument     Please don t delete this answer  let me keep one

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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    Now you should be able to use ApplicationContextSingleton getInstance   getApplicationContext   getResources   from anywhere  also the very few places where application subclasses can  t   Please let me know if you see anything wrong here  thank you

User · Answer

In your class  where you implement the static function  you can call a private public method from this class  The private public method can access the getResources   for example   public class Text       public static void setColor EditText et          et resetColor       it works           ERROR       et setTextColor getResources   getColor R color Black       ERROR             set the color to be black when reset    private void resetColor            setTextColor getResources   getColor R color Black             and from other class activity  you can call    Text setColor  some EditText you initialized

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I am using API level 27 and found a best solution after struggling for around two days  If you want to read a xml file from a class which doesn t derive from Activity or Application then do the following      Put the testdata xml file inside the assets directory  Write the following code to get the testdata document parsed       InputStream inputStream   this getClass   getResourceAsStream   assets testdata xml            create a new DocumentBuilderFactory     DocumentBuilderFactory factory   DocumentBuilderFactory newInstance           use the factory to create a documentbuilder     DocumentBuilder builder   factory newDocumentBuilder           create a new document from input stream     Document doc   builder parse inputStream

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There is also another possibilty  I load OpenGl shaders from resources like this   static private String vertexShaderCode  static private String fragmentShaderCode   static       vertexShaderCode   readResourceAsString   res raw vertex shader glsl        fragmentShaderCode   readResourceAsString   res raw fragment shader glsl       private static String readResourceAsString String path        Exception innerException      Class lt   extends FloorPlanRenderer gt  aClass   FloorPlanRenderer class      InputStream inputStream   aClass getResourceAsStream path        byte   bytes      try           bytes   new byte inputStream available             inputStream read bytes           return new String bytes         catch  IOException e            e printStackTrace            innerException   e            throw new RuntimeException  Cannot load shader code from resources    innerException       As you can see  you can access any resource in path  res     Change aClass to your class  This also how I load resources in tests  androidTests

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Create a subclass of Application  for instance public class App extends Application   Set the android name attribute of your  lt application gt  tag in the AndroidManifest xml to point to your new class  e g  android name   App  In the onCreate   method of your app instance  save your context  e g  this  to a static field named mContext and create a static method that returns this field  e g  getContext      This is how it should look   public class App extends Application       private static Context mContext        Override     public void onCreate             super onCreate            mContext   this             public static Context getContext            return mContext            Now you can use  App getContext   whenever you want to get a context  and then getResources    or App getContext   getResources

User · Answer

For system resources only   Use  Resources getSystem   getString android R string cancel    You can use them everywhere in your application  even in static constants declarations

User · Answer

Shortcut I use App getRes   instead of App getContext   getResources    as  Cristian answered  It is very simple to use anywhere in your code  So here is a unique solution by which you can access resources from anywhere like Util class    1  Create or Edit 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   or Skip this if already there   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 code

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public Static Resources mResources     Override      public void onCreate                     mResources   getResources

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I load shader for openGL ES from static function   Remember you must use lower case for your file and directory name  or else the operation will be failed  public class MyGLRenderer implements GLSurfaceView Renderer                 public static int loadShader                   Read file as input stream         InputStream inputStream   MyGLRenderer class getResourceAsStream   res raw vertex shader txt                   Convert input stream to string         Scanner s   new Scanner inputStream  useDelimiter    A            String shaderCode   s hasNext     s next

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I think  more way is possible  But sometimes  I using this solution   full global        import android content Context       import  lt your package gt  R       public class XmlVar            private XmlVar                        private static String  write success           public static String write success                 return  write success                      public static void Init Context c                 write success   c getResources   getString R string write success                     After activity created  cont   this getApplicationContext    XmlVar Init cont     And use everywhere XmlVar write success

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Another solution   If you have a static subclass in a non-static outer class  you can access the resources from within the subclass via static variables in the outer class  which you initialise on creation of the outer class  Like  public class Outerclass        static String resource1      public onCreate             resource1   getString R string text              public static class Innerclass            public StringGetter  int num                return resource1                       I used it for the getPageTitle int position  Function of the static FragmentPagerAdapter within my FragmentActivity which is useful because of I8N

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Getting image resouse as InputStream without context  Class lt   extends MyClass gt  aClass   MyClass class  URL r   aClass getResource  quot  res raw test png quot    URLConnection urlConnection   r openConnection    return new BufferedInputStream urlConnection getInputStream      If you need derectory tree for your files  it will also works  assets supports sub-dirs   URL r   aClass getResource  quot  assets images base 2 png quot

[java] How can I get a resource content from a static context?

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