java.lang.ClassCastException: android.widget.LinearLayout 无法转换为 android.widget.ScrollView

Question

我收到这个错误有一段时间了，在这里搜索了解决方案但没有任何效果。我正在尝试以编程方式在我的片段中添加 scrollview，它有一个 linearlayout 作为根元素。

我的片段布局xml

<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:background="#481327"
tools:context="com.gov.dmrd.disastermanagement.TestFragment3">

</LinearLayout>

fragment oncreateview

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    LinearLayout innerLayout = (LinearLayout) inflater.inflate(R.layout.fragment_test_fragment3, container, false);
    innerLayout.setOrientation(LinearLayout.VERTICAL);
    innerLayout.setScrollBarStyle(LinearLayout.SCROLLBARS_INSIDE_OVERLAY);
    ScrollView sv = (ScrollView) inflater.inflate(R.layout.fragment_test_fragment3, container, false);
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT);
    name = getResources().getStringArray(R.array.personnel_name);
    rank = getResources().getStringArray(R.array.personnel_rank);
    for (int i = 0; i < name.length; i++){
        TextView tv1 = new TextView(container.getContext());
        tv1.setText(name[i]);
        innerLayout.addView(tv1, params);
        TextView tv2 = new TextView(container.getContext());
        tv2.setText(rank[i]);
        innerLayout.addView(tv2, params);
    }
    sv.addView(innerLayout);
    return sv;
}

Answer 1

java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.ScrollView

因为试图将 LinearLayout 转换为 ScrollView

I'm trying to add the scrollview in my fragment programmatically which has a linearlayout as root element

动态创建 ScrollView 并将其添加到 innerLayout :

   View view=(View)inflater.inflate(R.layout.fragment_test_fragment3,
                                                                 container, false);
    ScrollView sv =new ScrollView(getActivity()); //<< create ScrollView object
   LinearLayout innerLayout=new LinearLayout(getActivity());//<<create LinearLayout
    //...your code here
    sv.addView(innerLayout);
    view.addView(sv);
    return view;