java - 查找 Include View 并更新 TextView

Question

我有一个 fragment ，里面有

<include layout="@layout/card" android:id="@+id/card" />
<include layout="@layout/card" android:id="@+id/card1" />
<include layout="@layout/card" android:id="@+id/card2" />

我的卡片 xml 只是一张简单的卡片，如下所示

<LinearLayout
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:orientation="horizontal"
            android:gravity="left|center_vertical">

            <TextView
                android:id="@+id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:maxLines="3"
                android:padding="8dp"
                android:text="Item Color"
                android:textColor="#222"
                android:textStyle="bold"
                android:textSize="18dp"
                android:gravity="center_vertical"/>

        </LinearLayout>

我在我的java fragment 中尝试做的是加载第一张卡包含并更改其 TextView 文本这是我尝试过的，但它返回 null

View card1 =  getActivity().findViewById(R.id.card1);
              TextView ct1 = (TextView) card1.findViewById(R.id.title);

那么我怎样才能实现我的目标或解决这个问题呢？感谢您的时间和帮助，非常感谢**** 更新 :这是整个 fragment

public class Home_Fragment extends Fragment {
   @Override
   public View onCreateView(LayoutInflater inflater,
      ViewGroup container, Bundle savedInstanceState) {

       //Inflate the layout for this fragment
         ViewGroup card1 = (ViewGroup)  getActivity().findViewById(R.id.card1);
              TextView ct1 = (TextView) card1.findViewById(R.id.title);
              ct1.setText("hey :P");

      return inflater.inflate(
              R.layout.home_fragment, container, false);

   }
}

Answer 1

在 Fragment 的内容 View 上使用 .findViewById(R.id.card1); 而不是 getActivity()

public View onCreateView(LayoutInflater inflater,
  ViewGroup container, Bundle savedInstanceState) {
   View contentView = inflater.inflate(
          R.layout.home_fragment, container, false);
   //Inflate the layout for this fragment
     ViewGroup card1 = (ViewGroup)  contentView.findViewById(R.id.card1);
          TextView ct1 = (TextView) card1.findViewById(R.id.title);
          ct1.setText("hey :P");

  return contentView;

}