Android getting resource ID from string

Question

I need to pass a resource ID to a method in one of my classes  It needs to use both the id that the reference points to and also it needs the string  How should I best achieve this   For example   R drawable icon   I need to get the integer ID of this  but I also need access to the string  icon    It would be preferable if all I had to pass to the method is the  icon  string

User · Answer

Simple method to get resource ID   public int getDrawableName Context ctx String str       return ctx getResources   getIdentifier str  drawable  ctx getPackageName

User · Answer

In your res layout my image layout xml   lt LinearLayout     gt       lt ImageView         android id    id row 0 col 7            gt       lt  ImageView gt   lt  LinearLayout gt    To grab that ImageView by its   id value  inside your java code do this    String row    0   String column   7   String tileID    row      row      col      column   ImageView image    ImageView  activity findViewById activity getResources                    getIdentifier tileID   id   activity getPackageName         Bottom code changes that ImageView to a different image   blank   R mipmap blank  is the name of an image I have in my drawable folder     image setImageResource R mipmap blank

User · Answer

You can use Resources getIdentifier    although you need to use the format for your string as you use it in your XML files  i e  package drawable icon

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If you need to pair a string and an int  then how about a Map   static Map lt String  Integer gt  icons   new HashMap lt String  Integer gt      static       icons add  icon1   R drawable icon       icons add  icon2   R drawable othericon       icons add  someicon   R drawable whatever

User · Answer

For getting Drawable id from String resource name I am using this code   private int getResId String resName        int defId   -1      try           Field f   R drawable class getDeclaredField resName           Field def   R drawable class getDeclaredField  transparent flag            defId   def getInt null           return f getInt null         catch  NoSuchFieldException   IllegalAccessException e            return defId

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You can use this function to get resource ID   public static int getResourceId String pVariableName  String pResourcename  String pPackageName         try           return getResources   getIdentifier pVariableName  pResourcename  pPackageName         catch  Exception e            e printStackTrace            return -1             So if you want to get for drawable call function like this  getResourceId  myIcon    drawable   getPackageName       and for string you can call it like this  getResourceId  myAppName    string   getPackageName       Read this

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EboMike  I didn t know that Resources getIdentifier   existed   In my projects I used the following code to do that   public static int getResId String resName  Class lt   gt  c         try           Field idField   c getDeclaredField resName           return idField getInt idField         catch  Exception e            e printStackTrace            return -1             It would be used like this for getting the value of R drawable icon resource integer value   int resID   getResId  icon   R drawable class      or other resource class   I just found a blog post saying that Resources getIdentifier   is slower than using reflection like I did  Check it out

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This is based on  Macarse answer   Use this to get the resources Id in a more faster and code friendly way   public static int getId String resourceName  Class lt   gt  c        try           Field idField   c getDeclaredField resourceName           return idField getInt idField         catch  Exception e            throw new RuntimeException  No resource ID found for                      resourceName           c  e             Example   getId  icon   R drawable class

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The Kotlin approach  inline fun  lt reified T  Class lt R drawable gt  gt  T getId resourceName  String   Int               return try                   val idField   getDeclaredField  resourceName                  idField getInt idField                catch  e Exception                    e printStackTrace                   -1                           Usage   val resId   R drawable  class java getId  icon

User · Answer

A simple way to getting resource ID from string    Here resourceName is the name of resource ImageView in drawable folder which is included in XML file as well    int resID   getResources   getIdentifier resourceName   id   getPackageName     ImageView im    ImageView  findViewById resID   Context context   im getContext    int id   context getResources   getIdentifier resourceName   drawable   context getPackageName     im setImageResource id

User · Answer

I did like this  it is working for me       imageView setImageResource context getResources             getIdentifier  drawable apple   null  context getPackageName

User · Answer

Since you said you only wanted to pass one parameter and it did not seem to matter which  you could pass the resource identifier in and then find out the string name for it  thus   String name   getResources   getResourceEntryName id     This might be the most efficient way of obtaining both values  You  don t have to mess around finding just the  icon  part from a longer string

User · Answer

How to get an application resource id from the resource name is quite a common and well answered question   How to get a native Android resource id from the resource name is less well answered  Here s my solution to get an Android drawable resource by resource name   public static Drawable getAndroidDrawable String pDrawableName       int resourceId Resources getSystem   getIdentifier pDrawableName   drawable    android        if resourceId  0           return null        else           return Resources getSystem   getDrawable resourceId             The method can be modified to access other types of resources

User · Answer

In MonoDroid   Xamarin Android you can do    var resourceId   Resources GetIdentifier  icon    drawable   PackageName     But since GetIdentifier it s not recommended in Android - you can use Reflection like this    var resourceId    int typeof Resource Drawable  GetField  icon   GetValue null     where I suggest to put a try catch or verify the strings you are passing

[java] Android, getting resource ID from string?

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