java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
These supply parameters to the?parent?of this view specifying how it should be arranged. There are many subclasses of ViewGroup.LayoutParams, and these correspond to the different subclasses of ViewGroup that are responsible for arranging their children.
So basically, if you are adding a view to another, you MUST set the LayoutParams of the view to the LayoutParams type that the parent uses, or you will get a runtime error.
?我是這樣理解的,如果你要將一個view添加到另一個布局中,你必須設定該View的布局參數(shù)為其父類所使用的布局參數(shù)類型。即要在代碼中動態(tài)改變某組件的高度,其布局參數(shù)類型應該是其父類所使用的布局參數(shù)類型。?比如:
<LinearLayout
? xmlns:android="http://schemas.android.com/apk/res/android" ?
? android:layout_width="wrap_content"
? android:layout_height="wrap_content"> ?
??
<FrameLayout?
android:id="@+id/FrameLayout01"?
android:layout_width="wrap_content"?
android:layout_height="wrap_content" />
</LinearLayout>
若想在代碼中動態(tài)改變FrameLayout的大小,應該這樣寫:
FrameLayout frameLayout=(FrameLayout) convertView.findViewById(R.id.FrameLayout01);?
?LinearLayout.LayoutParams ff=new?LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, height);
frameLayout.setLayoutParams(ff);注:其布局參數(shù)類型應該線性布局LinearLayout.LayoutParams的類型,而不是幀布局FrameLayout?.LayoutParams
總結
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