android.view.ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

Question

I am getting this expcetion: ``` java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams at android.widget.ListView.setupChild(ListView.java:1806) at android.widget.ListView.makeAndAddView(ListView.java:1775) at android.widget.ListView.fillDown(ListView.java:672) at android.widget.ListView.fillFromTop(ListView.java:732) at android.widget.ListView.layoutChildren(ListView.java:1625) at android.widget.AbsListView.onLayout(AbsListView.java:1863) at android.view.View.layout(View.java:11278) at android.view.ViewGroup.layout(ViewGroup.java:4224) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) at android.view.View.layout(View.java:11278) at android.view.ViewGroup.layout(ViewGroup.java:4224) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) at android.widg…

Accepted Answer

```
dialogTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
```

Here you're replacing existing layout params of correct type `AbsListView.LayoutParams` with more generic `ViewGroup.LayoutParams`. Layout params type is that of the parent container of the view.

If you need to modify existing layout params, access them with `getLayoutParams()`, modify it, and call `requestLayout()` to notify that the layout has changed.

Example. Instead of

```
fooView.setLayoutParams(new LayoutParams(123, 456));
```

do

```
LayoutParams lp = fooView.getLayoutParams();
lp.width = 123;
lp.height = 456;
fooView.requestLayout();
```

android.view.ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

Solution

Problem