Resources.getSystem() vs getResources()

Question

I am new to Android and I am learning the SDK myself from resource available over the net.

I came across a situation now. I am trying the below code:

Type 1:

Answer 1

All 3 return the same value, but Resources.getSystem() references to the system resources and might cause a crash if used incorrectly.

The advised usage is "getString(android.R.string.cancel);"

It is also used as such in the WalkieTalkieActivity.java code on the Android developer website.