如何以编程方式从片段中添加和删除视图

Question

我想有两个.xml 有条件的片段布局文件我想启动一个并在某些事件上更改为另一个，尝试搜索 Javadoc 以找到相关方法，任何指针都会有帮助

Answer 1

您需要创建extends Fragment 类和override onCreateView() 方法的两个类，并扩展您的布局。例如：

类 FragmentOne.java

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

       //Inflate the layout for this fragment

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


      }
    }

类 FragmentTwo.java

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

  // Inflate the layout for this fragment

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


 }
}

在你的 MainActivity.java

    Fragment fr;

         if(view == findViewById(R.id.button2)) {
             fr = new FragmentTwo();

         }else {
             fr = new FragmentOne();
         }

         FragmentManager fm = getFragmentManager();
         FragmentTransaction fragmentTransaction = fm.beginTransaction();
         fragmentTransaction.replace(R.id.fragment_place, fr);
         fragmentTransaction.commit();

Answer 2

试试这个..

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

   //Inflate the layout for this fragment
   if(condition1){
    return inflater.inflate(
          R.layout.fragment_one, container, false);
   }else{
    return inflater.inflate(
          R.layout.fragment_two, container, false);
   }


  }
}