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Every subclass of `Fragment` must be public and have a public, nullary
constructor. The Android framework will reflectively instantiate them after a
configuration change, such as screen rotation, and if the class is not
instantiable by `Class#newInstance()`, an `InstantiationException` will be
thrown.
In addition, it is strongly recommended that subclasses not have other
constructors with parameters, since these constructors will not be called when
the fragment is re-instantiated; instead, arguments should be supplied with
`setArguments(Bundle)` and retrieved with `getArguments()`.
For more information, please see the documentation for
[Fragment](http://developer.android.com/reference/android/app/Fragment.html#Fragment\(\)).
This check is an adaptation of the `ValidFragment` rule of
[Android Lint](http://tools.android.com/tips/lint-checks).
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