java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widg
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有时候需要在在代码中设置LayoutParams,自己为一个FrameLayout设置LayoutParams的时候,遇上如题问题,
java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams
FrameLayout的父控件是一个LinearLayout控件,问题出在,LinearLayout为子控件分配空间的时候,获取FrameLayout的LayoutParams的必须为LinearLayout.LayoutParams,而非FrameLayout.LayoutParams。
简单的举个栗子说明一下:最外层有ReLativeLayout A,里面有两个LinearLayout B、C,而B中又有一个一个FrameLayout D。如果要在代码里设置B的LayoutParams,B的LayoutParams要为RelativeLayout.LayoutParams。
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);B.setLayoutParams(params);
而D要设置的话,需要:
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 0);params.weight = 8;D.setLayoutParams(params);
这样问题即可解决。还是自己有些基础知识不牢固,写到此。
- java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widg
- java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widg
- java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widg
- java.lang.ClassCastException:android.widget.LinearLayout$LayoutParams cannot be cast to android.widg
- java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.....
- java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.wid
- java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutPara
- java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.L
- java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.w
- java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.wid
- java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.
- java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.R
- java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.wid
- java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.w
- java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.w
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