（轉自stackoverflow）

1.Permission 在自定義的ContentProvider中如何使用

http://stackoverflow.com/questions/14368867/permission-denial-opening-provider

2.如何動態的改變layout的寬和高

http://stackoverflow.com/questions/18655940/linearlayoutlayoutparams-cannot-be-cast-to-android-widget-framelayoutlayoutpar

Solution:

We must to kwow the parent ViewGroup container for the view, because each View is filled with its parent LayoutParams for measure purposes.

If we don't know through a simple glance on the xml which is the parent ViewGroup for the View, we can always get its reference with .getParent() method from the View instance.