Meaning of values assigned to properties in R.java

Question

What is the meaning of 0x7f05001c in R.java file of an android project

public static final int action_bar = 0x7f05001c;

Answer 1

R.java is a auto generated file in which reference of resources such as strings, drawbles, layouts, and styles are automatically added. In your question 0x7f05001c is just a reference id of action_bar.

For example: in activity we always write

TextView v = (TextView)findViewById(R.id.something);

In this we are getting the reference of Texview which is automatically generated in R.java

Answer 2

To my knowledge, that number is just a unique value assigned to an XML resource so you can create a Java object from it in your code: You can have multiple listviews in seperate XML layout's with the same ID, but they have their own unique int value so it can be distinguished.

Answer 3

It's an example of a magic number and the hexadecimal literal 0x7f05001c is 2131034140 in decimal.