为什么我在子类化 GridView 时收到 ClassCastException

Question

这很奇怪;出于某种原因，我很难让 GridView 的子类正确转换。我在尝试投射自定义网格视图时遇到Caused by: java.lang.ClassCastException: android.widget.GridView cannot be cast to com.dobydigital.dobixchange.CustomGridView。这是我的代码

自定义网格视图.java

import android.widget.GridView;
public class CustomGridView extends GridView {

文件浏览器片段.java

//# Other stuff omitted for brevity
private CustomGridView gridView;
public class FileBrowserFragment extends Fragment {
//# Stuff
}
//# .........
@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    //# This cast here throws the exception
    gridView = (CustomGridView) getView().findViewById(R.id.grid_view);

file_browser.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_node"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
<com.dobydigital.dobixchange.CustomGridView
    android:id="@+id/grid_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:numColumns="3"
    android:layout_weight="80" >
    <!-- Preview: listitem=@layout/image_tile -->
</com.dobydigital.dobixchange.CustomGridView>

<Button
    android:id="@+id/btn_confirm"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:text="Select this Directory" />
</LinearLayout>

我不知道发生了什么。我以前从未遇到过布局子类化的问题。

Answer 1

来自问题的评论：您不小心膨胀并在onCreateView() :)中返回错误的布局

Answer 2

gridView = (CustomGridView) findViewById(R.id.grid_view);

摆脱getView（）