LinearLayout.setLayoutParams(...,...)和FrameLayout.setLayoutParams(...,...)的正常和错误

Question

FrameLayout layout_frame=(LinearLayout)findViewById(R.id.layout_frame);FrameLayout 和 LinearLayout ，你编译都通不过

Answer 1

编译能通过
<LinearLayout android:id="@+id/layout_linear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:background="@color/cl_beige" >
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitCenter"
            android:id="@+id/imageview_background" />
</LinearLayout><FrameLayout android:id="@+id/layout_frame"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:background="@color/cl_beige" >
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitCenter"
            android:id="@+id/imageview_background" />
</FrameLayout>
(1)
LinearLayout layout_linear=(LinearLayout)findViewById(R.id.layout_linear);
layout_linear.setLayoutParams(new LinearLayout.LayoutParams(200,200);(2)
FrameLayout layout_frame=(FrameLayout )findViewById(R.id.layout_frame);
layout_frame.setLayoutParams(new LinearLayout.LayoutParams(200,200);为什么运行(2)程序会错误自动退出,而运行(1)程序却正常使用？

Answer 2

(2)
FrameLayout layout_frame=(FrameLayout )findViewById(R.id.layout_frame);
layout_frame.setLayoutParams(new FrameLayout .LayoutParams(200,200);