使用整理碎片时调用OnResume时后退按钮pressed [英] Call OnResume when Back Button Pressed when using Fragments

问题描述

我想补充一个片段是这样

  FragmentManager FM = SliderActivity.this
                    .getSupportFragmentManager（）;
            FragmentTransaction英尺= fm.beginTransaction（）;
            片段片段= NULL;
            片段=新HomeFragment（）;
            ft.add（R.id.content_fragment，片段，家）;
                ft.addToBackStack（家）;
                ft.commit（）;
 

和第二个片段为

  FragmentManager FM = SliderActivity.this
                    .getSupportFragmentManager（）;
            FragmentTransaction英尺= fm.beginTransaction（）;
            片段片段= NULL;
            片段=新HomeFragment（）;
            ft.add（R.id.content_fragment，片段，关于）;
            ft.addToBackStack（关于）;
            ft.commit（）;
 

我的问题是，如果我美元，AboutFragment（二）p $ PSS后退按钮然后如何调用HomeFragment的方法（一）

  onResume（）被不激发其创造的问题
 

解决方案

如果您要添加的片段
            ft.add（R.id.content_fragment，片段，关于）;
然后你回到pressed，那么就不会先打电话的任何方法调用fragment.To第一片段的方法替换片段：

ft.replace（R.id.content_fragment，片段，关于）;

，但它会调用onCreateView（）第一然后其他methods.It是不可能在上pssed调用onResume（背面$ P $片段），如在活动发生

I add first fragment like this

            FragmentManager fm = SliderActivity.this
                    .getSupportFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            Fragment fragment = null;
            fragment = new HomeFragment();
            ft.add(R.id.content_fragment, fragment, "Home");
                ft.addToBackStack("Home");
                ft.commit();

and second fragment as

            FragmentManager fm = SliderActivity.this
                    .getSupportFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            Fragment fragment = null;
            fragment = new HomeFragment();
            ft.add(R.id.content_fragment, fragment, "About");
            ft.addToBackStack("About");
            ft.commit();

My question is if I press back button from AboutFragment (Second) then how to call a method of HomeFragment (First)

            onResume() is not fired which is creating problem

解决方案

If you are adding fragment ft.add(R.id.content_fragment, fragment, "About"); then you back pressed, then it will not call any method of first fragment.To call the method of the first fragment replace the fragment :

ft.replace(R.id.content_fragment, fragment, "About");

but it will call onCreateView() first then other methods.It is not possible in fragment on backpressed to call onResume() , as in activity happens

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