The key must be an application-specific resource id
The reason you're not able to use setTag(int, Object) is because android require a pre-compiled unique id in the 'int' argument.
Try creating two unique entry in String.xml xml say, "firstname" & "secondname" & use them as below
imageView.setTag(R.string.firstname, "Abhishek");
imageView.setTag(R.string.lastname, "Gondalia");
THIS WILL DO THE JOB...
If you just have 1 setTag in your class, you could use any int, maybe static final declared in the top.
The problem comes when you had 2 or more setTag's with different keys. I mean:
public static final int KEY_1 = 1;
public static final int KEY_2 = 2;
...
setTag(KEY_1, VALUE_1)
setTag(KEY_2, VALUE_2)
...
That scenario is wrong. You then need to add a value file called maybe ids.xml with the following:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item type="id" name="resourceDrawable" />
<item type="id" name="imageURI" />
</resources>
Then, in your class, call:
...
setTag(R.id.resourceDrawable, VALUE_1)
setTag(R.id.imageURI, VALUE_2)
...
I'm a little late to the party but I stumbled on this problem myself today and thought I'd give an answer as well. This answer will be a bit of a compilation of the other answers, but with a twist. First of all, the id, as has been pointed out by others, can NOT be a constant defined in your code (such as private static final int MYID = 123) or any other int that you define as a field somewhere.
The id has to be a precompiled unique id, just like the ones you get for strings that you put in values/strings.xml (ie R.string.mystring). Refer to http://developer.android.com/guide/topics/resources/available-resources.html and http://developer.android.com/guide/topics/resources/more-resources.html for more information.
My suggestion is that you create a new file called values/tags.xml and write:
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<item name="TAG_ONLINE_ID" type="id"/>
</resources>
I think it's better to create a separate file instead of putting it in strings.xml as EtienneSky suggested.