调用ListView.addHeaderView()时ClassCastException?

时间:2011-11-26 01:38:49

标签: android android-listview

我有一个相当复杂的布局(包含RelativeLayouts,TextViews和ImageViews),我想放在listview上面。此视图应滚动列表视图。

我尝试使用以下代码将布局作为标题添加到列表视图中:

View v = inflater.inflate(R.layout.list_view, container, false);

View header = inflater.inflate(R.layout.header_layout, container, false);

// populate views in the header

mList = (ListView)v.findViewById(R.id.list);
mList.addHeaderView(header);
mAdapter = new ReviewsAdapter(getActivity());
mList.setAdapter(mAdapter); <-- error occurs here

ReviewsAdapter是我编写的自定义适配器,扩展了BaseAdapter

执行代码后,我收到此错误:

11-25 17:19:14.802: E/AndroidRuntime(1215): java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
11-25 17:19:14.802: E/AndroidRuntime(1215):     at android.widget.ListView.clearRecycledState(ListView.java:513)
11-25 17:19:14.802: E/AndroidRuntime(1215):     at android.widget.ListView.resetList(ListView.java:499)
11-25 17:19:14.802: E/AndroidRuntime(1215):     at android.widget.ListView.setAdapter(ListView.java:442)
11-25 17:19:14.802: E/AndroidRuntime(1215):     at com.coppi.storefront.product.ProductReviewsFragment.onCreateView(ProductReviewsFragment.java:104)

如果我注释掉mList.addHeaderView(header)行,我就不会收到错误消息。我也可以在没有列表视图的情况下显示标题布局而没有任何问题。

我认为这与标题布局的内容有关,但我不确定究竟会导致它的原因。

这是标题xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <RelativeLayout
            android:id="@+id/header_section"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/margin_sides"
            android:background="@color/pdp_availability_section_background" >

            <TextView
                android:id="@+id/header_text"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/margin_sides"
                android:paddingBottom="@dimen/margin_sides"
                android:text="@string/ratings_reviews"
                android:textColor="#000"
                android:textSize="18dp" />
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/body_section"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_below="@id/header_section" >

            <TextView
                android:id="@+id/product_title"
                style="@style/ProductTitleFont"
                android:layout_marginBottom="@dimen/product_title_bottom_margin"
                android:layout_marginLeft="@dimen/margin_sides"
                android:layout_marginRight="@dimen/margin_sides" />

            <RelativeLayout
                android:id="@+id/attributes_section"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/product_title"
                android:layout_centerHorizontal="true"
                android:layout_margin="@dimen/margin_sides" >

                <LinearLayout
                    android:id="@+id/overall_section"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:gravity="bottom" >

                    <TextView
                        android:id="@+id/overall_label"
                        style="@style/ProductTitleFont"
                        android:layout_width="wrap_content"
                        android:text="@string/overall_rating" />

                    <ImageView
                        android:id="@+id/overall_1"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="10dp"
                        android:src="@drawable/icon_rating_empty" />

                    <ImageView
                        android:id="@+id/overall_2"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/icon_rating_empty" />

                    <ImageView
                        android:id="@+id/overall_3"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/icon_rating_empty" />

                    <ImageView
                        android:id="@+id/overall_4"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/icon_rating_empty" />

                    <ImageView
                        android:id="@+id/overall_5"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/icon_rating_empty" />

                    <TextView
                        android:id="@+id/overall_score"
                        style="@style/ProductTitleFont"
                        android:layout_width="wrap_content"
                        android:layout_marginLeft="10dp"
                        android:text="4.6" />
                </LinearLayout>

                <Button
                    android:id="@+id/rate_review_button"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/overall_section"
                    android:layout_marginBottom="@dimen/margin_sides"
                    android:layout_marginTop="@dimen/margin_sides"
                    android:text="@string/rate_review_button_text" />
            </RelativeLayout>

            <View
                android:id="@+id/attributes_divider"
                android:layout_width="fill_parent"
                android:layout_height="1dp"
                android:layout_below="@id/attributes_section"
                android:layout_marginBottom="@dimen/margin_sides"
                android:layout_marginTop="@dimen/margin_sides"
                android:background="@color/pdp_section_divider" />

            <TextView
                android:id="@+id/review_count"
                style="@style/ProductTitleFont"
                android:layout_width="wrap_content"
                android:layout_below="@id/attributes_divider"
                android:layout_marginLeft="@dimen/margin_sides"
                android:text="0 " />

            <TextView
                style="@style/ProductTitleFont"
                android:layout_width="wrap_content"
                android:layout_alignBaseline="@id/review_count"
                android:layout_marginRight="@dimen/margin_sides"
                android:layout_toRightOf="@id/review_count"
                android:text="@string/customer_reviews" />

            <View
                android:id="@+id/review_count_divider"
                android:layout_width="fill_parent"
                android:layout_height="1dp"
                android:layout_below="@id/review_count"
                android:layout_marginBottom="@dimen/margin_sides"
                android:layout_marginTop="@dimen/margin_sides"
                android:background="@color/pdp_section_divider" />
        </RelativeLayout>
    </RelativeLayout>

更新:我尝试将标题.xml文件缩减为单个TextView,问题仍然存在。所以我不相信问题是由xml中的某些东西引起的。

4 个答案:

答案 0 :(得分:75)

FrameLayoutAbsListView将其子级布局参数转换为FrameLayout.LayoutParamsAbsListView.LayoutParams。这是铸造失败的地方。

View header = View.inflate(this, R.layout.header_layout, null);

应该修复它。

编辑: 正如评论中所提到的,更改inflate调用的ViewGroup参数也可以使其工作:

header = inflater.inflate(R.layout.header_layout, null, false);

答案 1 :(得分:16)

虽然Souvlaki的方法将解决问题并允许您继续工作。最好将视图夸大其对容器的引用。这样Android就可以正确地为正确的上下文充气。

你应该做的是找到ListView,然后将其传递给充气。

ListView listView = (ListView) layout.findViewById(R.id.listview);
View header = inflater.inflate(this, R.layout.header_layout, listView, false);

答案 2 :(得分:2)

我看到同样的情况。 在我的情况下,调用ListView.addHeaderView()的时间是一个麻烦。

之前:(错误)
ListView.addHeaderView()在Fragment.onCreateView()方法中调用。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View layout = inflater.inflate(R.layout.fragment_main, container, false);
    mListView = (ListView) layout.findViewById(R.id.listview);
    mListView.addHeaderView(inflater.inflate(R.layout.list_header_book, listview, false));
    return layout;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    mAdapter = new BookAdapter(getActivity(), mBookList);
    mListView.setOnItemClickListener(mBookItemClickListener);
    mListView.setAdapter(mAdapter);
}


后:(OK)
在Fragment.onActivityCreated()方法中调用ListView.addHeaderView()。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_main, container, false);
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    mAdapter = new BookAdapter(getActivity(), mBookList);
    mListView = (ListView) getView().findViewById(R.id.listview);
    mListView.setOnItemClickListener(mBookItemClickListener);
    mListView.addHeaderView(LayoutInflater.from(getActivity()).inflate(R.layout.list_header_book, null));
    mListView.setAdapter(mAdapter);
}

答案 3 :(得分:1)

来自drspaceboo's post above,这对我有用:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    mListLayoutView = inflater.inflate(getLayoutId(), container, false);

    int headerLayoutId = R.layout.list_header_layout;
    mListHeaderView = inflater.inflate(headerLayoutId, mResourcesListView, false);

    // ...

    mResourcesListView.addHeaderView(mListHeaderView, null, false);

其中getLayoutId()返回包含ListView xml

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