Question

我有一个片段，里面有我的

<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片段中尝试做的是加载第一张卡片包含并选择其文本视图文本这是我尝试但它返回null

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

那么我如何实现目标或解决这个问题呢？感谢您的时间和帮助，感谢您 ****更新：继承人整个片段

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

在片段的内容视图上使用package Pali; import java.util.Scanner; /** * Created by alexa on 11/4/2016. */ public class Palindromes { public static void main(String[] args) { String msg; Scanner scan = new Scanner(System.in); System.out.print("Enter a string: "); msg = scan.nextLine(); System.out.print("\nThe string backwards: "); printBackwards(msg); System.out.println(); } public static String printBackwards(String s) { if (s.length() == 0) return s; return printBackwards(s.substring(1)) + s.charAt(0); } }而不是.findViewById(R.id.card1);

getActivity()

}

查找包含视图并更新TextView

1 个答案: