ClassCastException: ...RelativeLayout$LayoutParams cannot be cast to ...AbsListView$LayoutParams

java.lang.ClassCastException: android.widget.RelativeLayout LayoutParams cannot be cast to android.widget.AbsListView LayoutParams

原因：FrameLayout的父控件是一个LinearLayout控件，LinearLayout为子控件分配空间的时候，获取FrameLayout的LayoutParams的必须为LinearLayout.LayoutParams，而非FrameLayout.LayoutParams

场景：开发的过程中我们可能需要在java代码中去给某个控件设置宽高，或者设置Margin值，再或者addView等等

举例：最外层是一个ReLativeLayout A，里面有一个LinearLayout B，而B中又有一个FrameLayout C

如果要在代码里设置B的LayoutParams,那么B的LayoutParams应为RelativeLayout.LayoutParams

RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
B.setLayoutParams(params);

而C的LayoutParams应为LinearLayout.LayoutParams

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
C.setLayoutParams(params);