How to add image in a TextView text?

I've searched around on Google and came across this site where I found a question similar to mine in which how to include a image in a TextView text, for example "hello my name is [image]", and the answer was this:

ImageSpan is = new ImageSpan(context, resId);
text.setSpan(is, index, index + strLength, 0);

I would like to know in this code,

1. What am I supposed to type or do in the context?
2. Am I supposed to do something to the text.setSpan() like import or reference or leave it text?

If someone can break this down for me that would be much appreciated.