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We can define ids like this:
<TextView android:id="@+id/btn1" />
But there are many activities and many components, the ids may be duplicated with others easily.
Is it able to define nested ides, like:
<TextView android:id="@+id/index/btn1" />
No you cannot. However, you can either 1) create the semblance of a namespace using _ for example:
or 2) you can reuse the same Id but in a different xml file. As long as there aren’t duplicate ids inside of a view, findViewById() will work fine.
See the section on IDs in the docs for more info: http://developer.android.com/reference/android/view/View.html