What is better android.R or custom R?

Question

When I started developping android applications, I had a tendency to define custom R values wherever I need, in particular in layout files. For instance:

findViewById(R.id.customerName).setText(customer.getName())

with layout:

<TextView android:text="TextView" android:id="@id/customerName"
    android:layout_height="wrap_content" android:layout_width="fill_parent" />

Now I realize, it might be better to use android.R instead.

findViewById(android.R.id.text1).setText(customer.getName())

with layout:

<TextView android:text="TextView" android:id="@android:id/text1"
    android:layout_height="wrap_content" android:layout_width="fill_parent" />

What practice do you follow? What are the advantages and disadvantages of each?

Answer 1

android.R is meant for utilizing resources built in to the operating system.

There are many images/layouts/etc... that come with the operating system that you can just reference using android.R

if you are referencing your own resources that you have created, most always use R. and in most situations I recommend trying to stay away from the built in resources as they change version to version.