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http://developer.android.com/training/basics/firstapp/starting-activity.html1, Compared with setClickListener in activity, another way to set onClick to a button in XML file: add theandroid:onClick="
http://developer.android.com/training/basics/firstapp/building-ui.html1, View/View Group2, LinearLayout is a view group (a subclass of ViewGroup) that lays out child views in either a vertical or hori
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