MergeAdapter和ClassCastException（使用LinearLayout $ LayoutParams和AbsListView $ LayoutParams）

时间：2014-07-07 05:29:55

标签： java android android-listview android-adapter classcastexception

我正在尝试制作包含ListView可滚动的整个布局。也就是说，整个布局应该拥有滚动条而不仅仅是ListView。我正在尝试使用commonsguy的MergeAdapter（https://github.com/commonsguy/cwac-merge），但我认为我没有正确实现它，因为我收到以下错误：

07-07 11:05:20.431: E/AndroidRuntime(24474): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.ListView.setupChild(ListView.java:1872)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.ListView.makeAndAddView(ListView.java:1841)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.ListView.fillDown(ListView.java:681)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.ListView.fillFromTop(ListView.java:742)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.ListView.layoutChildren(ListView.java:1659)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.AbsListView.onLayout(AbsListView.java:2431)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1669)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1527)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at     android.widget.LinearLayout.onLayout(LinearLayout.java:1440)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:690)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1669)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1527)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.LinearLayout.onLayout(LinearLayout.java:1440)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.View.layout(View.java:14482)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewGroup.layout(ViewGroup.java:4469)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2151)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1970)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1183)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4863)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.Choreographer.doFrame(Choreographer.java:532)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.os.Handler.handleCallback(Handler.java:725)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.os.Looper.loop(Looper.java:137)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at android.app.ActivityThread.main(ActivityThread.java:5328)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at java.lang.reflect.Method.invokeNative(Native Method)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at java.lang.reflect.Method.invoke(Method.java:511)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-07 11:05:20.431: E/AndroidRuntime(24474):    at dalvik.system.NativeStart.main(Native Method)

这是班级：

public class HomeFragment extends Fragment implements Navigable {

private ListView mHomeList;
private String[] mHomeListStrings = {"lorem","ipsum","loremm","ipsumm"};
private Integer[] mImageIds = {null, null, null, null};
private MergeAdapter mMergeAdapter;

public HomeFragment() { }

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_home, container, false);

    //Set string spannable
    String s= "Name\nBusiness";
    SpannableString ss1=  new SpannableString(s);
    ss1.setSpan(new RelativeSizeSpan(1.5f), 0,4, 0); // set size
    TextView tv= (TextView) rootView.findViewById(R.id.home_header);
    tv.setText(ss1); 

    //Set up list view
    mHomeList = (ListView) rootView.findViewById(R.id.home_list);
    ListAdapter adapter = new ListAdapter(getActivity(), mHomeListStrings, mImageIds);

    //I'm doing something wrong either here, or with my xml layout (I think)
    mMergeAdapter = new MergeAdapter();
    mMergeAdapter.addView(rootView.findViewById(R.id.home_header));
    mMergeAdapter.addAdapter(adapter);
    mMergeAdapter.addView(rootView.findViewById(R.id.apply_button));

    mHomeList.setAdapter(mMergeAdapter);

    return rootView;

}
}

我的片段布局如下（我取出了项目属性以缩短它）：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.xxxx.core.HomeFragment" 
android:background="@drawable/bg">

    <TextView
    android:id="@+id/home_header"
    android:layout_width="match_parent"
    android:layout_height="0dip"
    android:layout_weight="0.5">

    <ListView
    android:id="@+id/home_list"
    android:layout_width="match_parent"
    android:layout_height="0dip"
    android:layout_weight="2">
    </ListView>

    <Button
    android:id="@+id/apply_button"
    android:layout_width="match_parent"
    android:layout_height="0dip"
    android:layout_weight="0.30"/>

</LinearLayout>

1 个答案:

答案 0 :(得分：1)

您应该尝试在页面中添加页眉和页脚，而不是将ListView放在ScrollView中。

http://www.vogella.com/tutorials/AndroidListView/article.html#miscellaneous_headerfooter

将列表顶部和列表底部的简单视图放到不同的xml布局中。

只将列表视图放在上面的布局和JAVA中，给这些布局充气并分别添加为页眉和页脚。

如果MergeAdapter尝试将标题（TextView）和页脚（Button）放在不同的xml中并对其进行充气，而不是使用相同的xml。

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