How do I get the resource id of an image if I know its name

Question

How do I get the resource id of an image if I know its name  in Android

User · Answer

Example for a public system resource      this will get id for android R drawable ic dialog alert int id   Resources getSystem   getIdentifier  ic dialog alert    drawable    android        Another way is to refer the documentation for android R drawable class

User · Answer

You can also try this   try       Class res   R drawable class      Field field   res getField  drawableName        int drawableId   field getInt null     catch  Exception e        Log e  MyTag    Failure to get drawable id    e       I have copied this source codes from below URL  Based on tests done in this page  it is 5 times faster than getIdentifier    I also found it more handy and easy to use  Hope it helps you as well   Link  Dynamically Retrieving Resources in Android

User · Answer

One other scenario which I encountered   String imageName   Hello  and then when it is passed into  getIdentifier function as first argument  it will pass the name with string null termination and will always return zero  Pass this imageName substring 0  imageName length  -1

User · Answer

With something like this   String mDrawableName    myappicon   int resID   getResources   getIdentifier mDrawableName    drawable   getPackageName

User · Answer

You can use this function to get a Resource ID   public static int getResourseId Context context  String pVariableName  String pResourcename  String pPackageName  throws RuntimeException       try           return context getResources   getIdentifier pVariableName  pResourcename  pPackageName         catch  Exception e            throw new RuntimeException  Error getting Resource ID    e               So if you want to get a Drawable Resource ID  you can call the method like this   getResourseId MyActivity this   myIcon    drawable   getPackageName        or from a fragment    getResourseId getActivity     myIcon    drawable   getActivity   getPackageName         For a String Resource ID you can call it like this   getResourseId getActivity     myAppName    string   getActivity   getPackageName       etc       Careful  It throws a RuntimeException if it fails to find the Resource ID  Be sure to recover properly in production   Read this

[android] How do I get the resource id of an image if I know its name?

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