Question

我正在尝试动态地向Fragment添加多个视图：

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


     ViewGroup vg = (ViewGroup) inflater.inflate(R.layout.fragment1, container, false);
     ViewGroup parent = (ViewGroup) getActivity().findViewById(R.id.linearLayoutOfFirstFragment);
     if (parent==null) 
     Toast.makeText(getActivity(), 
            "Null object " , 
            Toast.LENGTH_SHORT).show(); //findViewById(R.id.linearLayoutOfFirstFragment);
     myFirstView= (TextView)inflater.inflate(R.layout.mytextview, container, false);
     vg.addView(myFirstView);
     /*mySecondView= (TextView)inflater.inflate(R.layout.mytextview, container, false);
     parent.addView(mySecondView);

...

片段1的XML - fragment1.xml：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
>
<LinearLayout 
  android:id="@+id/linearLayoutOfFirstFragment"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:background="#00FF00"/>
</ScrollView>

当顶部布局为线性布局时，我可以将其添加到片段中。但是，当在膨胀后尝试将其添加到内部滚动视图内的线性布局时，将线性布局对象设为NULL。我是否应该对线性布局进行充气，以便能够添加？怎么做？先感谢您。

Answer 1

更改

ViewGroup vg = (ViewGroup) inflater.inflate(R.layout.fragment1, container, false);
ViewGroup parent = (ViewGroup) getActivity().findViewById(R.id.linearLayoutOfFirstFragment);

带

ViewGroup vg = (ViewGroup) inflater.inflate(R.layout.fragment1, container, false);
 ViewGroup parent = (ViewGroup) vg.findViewById(R.id.linearLayoutOfFirstFragment);

由于linearLayoutOfFirstFragment位于fragment1内，您必须通过vg检索它

为什么Fragment ScrollView中的LinearLayout是NULL对象？

1 个答案: