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

时间:2023-01-20 23:26:55

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

FrameLayout的父控件是一个LinearLayout控件,问题出在,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。

          简单的举个栗子说明一下:最外层有ReLativeLayout A,里面有两个LinearLayout B、C,而B中又有一个一个FrameLayout D。如果要在代码里设置B的LayoutParams,B的LayoutParams要为RelativeLayout.LayoutParams。

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


         而D要设置的话,需要:

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 0);   params.weight = 8;   D.setLayoutParams(params);



还有ListView.LayoutParams