java.lang.ClassCastException: android.widget.FrameLayout$Lay

   

java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams

FrameLayout的父控制項是一個LinearLayout控制項，問題出在，LinearLayout為子控制項分配空間的時候，擷取FrameLayout的LayoutParams的必須為LinearLayout.LayoutParams，而非FrameLayout.LayoutParams。

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

         而D要設定的話，需要：

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

這樣問題即可解決。還是自己有些基礎知識不牢固，寫到此。