How to change home as up resource programmatically?

Question

I know how to change the homeAsUpIndicator in the styles xml file. The question is how to change it programmatically.

The reason I want to do it bec

Answer 1

int upId = Resources.getSystem().getIdentifier("up", "id", "android");
if (upId > 0) {
    ImageView up = (ImageView) findViewById(upId);
    up.setImageResource(R.drawable.ic_drawer_indicator);
}