How to Efficiently Get an Android Resource ID from its String Name?

Getting Resource ID from String in Android

When passing a resource ID to a method, it's often desirable to access both the ID and the corresponding string. For instance, consider the "icon" resource:

R.drawable.icon

To obtain both the ID and the string "icon", several approaches can be explored:

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

int resID = getResources().getIdentifier("icon", "drawable", getPackageName());
String iconString = "icon";

However, recent research has indicated that Resources.getIdentifier() can be less efficient than using reflection.

Alternatively, you can employ the following reflection-based code:

public static int getResId(String resName, Class<?> c) {

    try {
        Field idField = c.getDeclaredField(resName);
        return idField.getInt(idField);
    } catch (Exception e) {
        e.printStackTrace();
        return -1;
    } 
}

To utilize this method for the "icon" resource:

int resID = getResId("icon", R.drawable.class); // or other resource class
String iconString = "icon";

Although this reflection approach may be more efficient, it's important to note potential drawbacks. In a release build with code/resource shrinking enabled, this solution may fail. Additionally, it might not work in cases where the string name differs from the expected resource name format.

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