android.view.ViewGroup $ LayoutParams无法转换为android.widget.AbsListView $ LayoutParams [英] android.view.ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
问题描述
我正在获得这个愿望:
java.lang.ClassCastException:android.view.ViewGroup $ LayoutParams无法转换为android.widget.AbsListView $ LayoutParams在android.widget.ListView.setupChild(ListView.java:1806)在android.widget.ListView.makeAndAddView(ListView.java:1775)在android.widget.ListView.fillDown(ListView.java:672)在android.widget.ListView.fillFromTop(ListView.java:732)在android.widget.ListView.layoutChildren(ListView.java:1625)在android.widget.AbsListView.onLayout(AbsListView.java:1863)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)在android.widget.LinearLayout.onLayout(LinearLayout.java:1399)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)在android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1617)在android.widget.LinearLayout.onLayout(LinearLayout.java:1401)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)在android.widget.LinearLayout.onLayout(LinearLayout.java:1399)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.FrameLayout.onLayout(FrameLayout.java:431)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)在android.widget.LinearLayout.onLayout(LinearLayout.java:1399)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.widget.FrameLayout.onLayout(FrameLayout.java:431)在android.view.View.layout(View.java:11278)在android.view.ViewGroup.layout(ViewGroup.java:4224)在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1504)在android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2458)在android.os.Handler.dispatchMessage(Handler.java:99)在android.os.Looper.loop(Looper.java:137)在android.app.ActivityThread.main(ActivityThread.java:4424)在java.lang.reflect.Method.invokeNative(本机方法)在java.lang.reflect.Method.invoke(Method.java:511)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)在dalvik.system.NativeStart.main(本机方法)
但是问题是我找不到问题的根源.到底在哪里,这意味着什么?
那为什么是小部件,我没有任何小部件!
代码:
不确定是否在这里:
公共类MyListPreference扩展了ListPreference {公共MyListPreference(上下文上下文){超级(上下文);}public MyListPreference(Context context,AttributeSet attrs){超级(上下文,attrs);}@Override受保护的视图onCreateDialogView(){TextView dialogTitle =(TextView)super.onCreateDialogView();如果(dialogTitle!= null){//对话框dialogTitle.setBackgroundColor(getContext().getResources().getColor(R.color.category_background));dialogTitle.setPadding(10,4,4,4);//文本dialogTitle.setTextSize(14);dialogTitle.setTypeface(null,Typeface.BOLD);dialogTitle.setTextColor(getContext().getResources().getColor(R.color.actionbar_background));dialogTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));}返回dialogTitle;}}
dialogTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
在这里,您将使用更通用的 ViewGroup.LayoutParams
替换正确类型为 AbsListView.LayoutParams
的现有布局参数.布局参数类型是视图的父容器的类型.
如果需要修改现有的布局参数,请使用 getLayoutParams()
访问它们,进行修改,然后调用 requestLayout()
通知布局已更改./p>
示例.代替
fooView.setLayoutParams(new LayoutParams(123,456));
做
LayoutParams lp = fooView.getLayoutParams();lp.width = 123;lp.height = 456;fooView.requestLayout();
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.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1617)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1401)
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.FrameLayout.onLayout(FrameLayout.java:431)
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.FrameLayout.onLayout(FrameLayout.java:431)
at android.view.View.layout(View.java:11278)
at android.view.ViewGroup.layout(ViewGroup.java:4224)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1504)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2458)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
but the problem is that I can not find the root of the problem. Where exactly and what that means?
And why widget, i don't have any widget!
CODE:
Not sure if here:
public class MyListPreference extends ListPreference {
public MyListPreference(Context context) {
super(context);
}
public MyListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected View onCreateDialogView() {
TextView dialogTitle = (TextView)super.onCreateDialogView();
if (dialogTitle != null) {
// Dialog
dialogTitle.setBackgroundColor(getContext().getResources().getColor(R.color.category_background));
dialogTitle.setPadding(10, 4, 4, 4);
// Text
dialogTitle.setTextSize(14);
dialogTitle.setTypeface(null, Typeface.BOLD);
dialogTitle.setTextColor(getContext().getResources().getColor(R.color.actionbar_background));
dialogTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
return dialogTitle;
}
}
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();
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