How Can I Efficiently Retrieve Android Resource IDs and Their Corresponding Strings?

How to Obtain Resource ID and String from Android Resource File?

In Android development, it becomes necessary to pass a resource ID to methods within classes. Typically, developers require both the ID and the corresponding string associated with that resource. A common example of this situation arises when working with image drawables.

Consider the resource ID R.drawable.icon, which represents the icon image. To utilize both the ID and the string "icon," various approaches can be explored:

One solution involves employing the Resources.getIdentifier() method:

int resId = getResources().getIdentifier("icon", "drawable", packageName);

Here, getResources() refers to the context object, packageName is the application's package name, and "icon" represents the string identifier. However, this method can be relatively slow, particularly in release builds with code/resource shrinking enabled.

An alternative approach is to use reflection to access the desired resource field:

Class resClass = R.drawable.class;
Field field = resClass.getDeclaredField("icon");
int id = field.getInt(null);

This method directly accesses the resource field, offering faster performance than the previous approach. However, it may encounter issues in the event of resource shrinking or when resource names differ from string identifiers.

Additional Considerations:

When utilizing reflection, it's crucial to note that code/resource shrinking may render the approach ineffective in release builds. Additionally, some resources, such as strings defined using , may not have field names that correspond to the actual string identifier.

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