Question

我有两个片段片段A和片段B.我在主要活动中使用添加片段方法

 String backStateName = fragment.getClass().getName();
    FragmentManager fragmentManager = getSupportFragmentManager();
    boolean fragmentPopped = fragmentManager.popBackStackImmediate(backStateName, 0);

    if (!fragmentPopped) {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        ft.add(R.id.frame_container_admin, fragment, backStateName);
        ft.addToBackStack(backStateName);
        ft.commit();
    }

在此之后，每当我从片段B回来时，我想从服务器重新加载数据。我怎么处理这个？

Answer 1

在您的活动中

为backstackchange创建一个监听器

getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
            @Override
            public void onBackStackChanged() {
              try {

                  //Get current visible fragment
                  FragmentManager fragmentManager = ((AppCompatActivity) activity).getSupportFragmentManager();
                  Fragment currentVisibleFragment = fragmentManager.findFragmentById(R.id.container_fragment);


                 if(currentVisibleFragment instanceof FragmentB){
                    //Cast currentVisibleFragment to Fragment B and call method to request data again.
                    ((FragmentB)currentVisibleFragment).requestData();
                 }
              } catch (Exception e) {
                   e.printStackTrace();
              }
            }
}

使用您的请求代码在片段B中创建请求数据方法。

使用片段返回堆栈处理加载数据

1 个答案: