Android – Why not to use static for View fields in your Activity or Fragments by Lars Vogel:
Your should not use static for defining fields for Views in your Android application.
Then creating a View, the LayoutInflater (used in setContentView(R.layout.ID)) uses the current Context (of the Activity) and pass it to the inflated Views. A reference to the given Context is always kept by the View class and can be retrieved via the getContext() method.
As a consequence, keeping a static reference on a View means that your Activity keeps a reference on your View which keeps a reference on the activity instance. This is what leads to the leak.
Thanks to Cyril Mottier for explaining that in G+.
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