java - MainActivity 到 Fragment，然后从该 Fragment 返回到 MainActivity

Question

Solve by using getActivity()
我有这个 MainActivity.java 和 RepeatEntry.java

在我的 MainActivity 中，我有这个代码来实现 RepeatEntry ui

//i did hide two linear layout here with buttons and edittext inside it ,using the following method 
 hideTwoLinearLayout();
 showCategoryContainerLayout();
Fragment fragment = new RepeatEntry();
 FragmentManager fm = getFragmentManager();
 FragmentTransaction ft = fm.beginTransaction();
  //category_cont is a linear layout container for my fragment
 ft.replace(R.id.category_cont, fragment);
 ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
 ft.commit();

在我的 RepeatEntry.java 示例代码中

Button k = (Button) v.findViewById(R.id.button);
        k.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               // Intent intent = new Intent(getActivity(),MainActivity.class);
               // startActivity(intent);

               // if i use popBackStack and also remove the code for intent , i cannot show what i hide  
//note i have a method inside mainactivity to showTwoLinearLayout()
               getFragmentManager().popBackStack();
            }
        });

现在我的问题是，除了使用 Intent 返回 MainActivity View 之外，我还有其他选择吗

注意:已编辑

Answer 1

您可以将交易添加到后台堆栈，然后通过弹出后台堆栈进行反向操作，代码在这里

 Fragment fragment = new RepeatEntry();
 FragmentManager fm = getFragmentManager();
 FragmentTransaction ft = fm.beginTransaction();
  //category_cont is a linear layout container for my fragment
 ft.replace(R.id.category_cont, fragment).addToBackStack("tag");
 ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
 ft.commit();

要返回到 Activity View ，请调用此函数来弹出后退堆栈

FragmentManager fm = getFragmentManager();
fm.popBackStack();

您还可以使用标签来弹出特定交易

fm.popBackStack("tag");