Android片段管理器片段更改侦听器

使用

FragmentManager

替换片段时，是否可以在事件完成时添加侦听器

所以

---

我是否可以向

myFragmentManager

添加一个侦听器，以便知道片段何时被替换？

当新的

片段处于活动状态时，将启动新的
片段
的
恢复
功能。当前面的
片段被替换时，你可以做你想做的事情。
FragmentManager（android.support.v4.app.FragmentManager）
有一个很好的方法叫做
registerFragmentLifecycleCallbacks
，它可以帮助注册
FragmentManager.FragmentLifecycleCallbacks
。这允许我们在碎片的生命周期中采取行动。您可以在
onFragmentCreated（）
中根据需要执行某些操作

FragmentManager fragmentManager =  getSupportFragmentManager();
        fragmentManager.registerFragmentLifecycleCallbacks(new FragmentManager.FragmentLifecycleCallbacks() {
            @Override
            public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) {
                super.onFragmentPreAttached(fm, f, context);
                Log.v("FragXX1", f.getTag());
            }

            @Override
            public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) {
                super.onFragmentAttached(fm, f, context);
                Log.v("FragXX2", f.getTag());
            }

            @Override
            public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {
                super.onFragmentCreated(fm, f, savedInstanceState);
                Log.v("FragXX3", f.getTag());
            }

            @Override
            public void onFragmentActivityCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {
                super.onFragmentActivityCreated(fm, f, savedInstanceState);
                Log.v("FragXX4", f.getTag());
            }

            @Override
            public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, Bundle savedInstanceState) {
                super.onFragmentViewCreated(fm, f, v, savedInstanceState);
                Log.v("FragXX5", f.getTag());
            }

            @Override
            public void onFragmentStarted(FragmentManager fm, Fragment f) {
                super.onFragmentStarted(fm, f);
                Log.v("FragXX6", f.getTag());
            }

            @Override
            public void onFragmentResumed(FragmentManager fm, Fragment f) {
                super.onFragmentResumed(fm, f);
                Log.v("FragXX7", f.getTag());
            }

            @Override
            public void onFragmentPaused(FragmentManager fm, Fragment f) {
                super.onFragmentPaused(fm, f);
                Log.v("FragXX8", f.getTag());
            }

            @Override
            public void onFragmentStopped(FragmentManager fm, Fragment f) {
                super.onFragmentStopped(fm, f);
                Log.v("FragXX9", f.getTag());
            }

            @Override
            public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) {
                super.onFragmentSaveInstanceState(fm, f, outState);
                Log.v("FragXX10", f.getTag());
            }

            @Override
            public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {
                super.onFragmentViewDestroyed(fm, f);
                Log.v("FragXX11", f.getTag());
            }

            @Override
            public void onFragmentDestroyed(FragmentManager fm, Fragment f) {
                super.onFragmentDestroyed(fm, f);
                Log.v("FragXX12", f.getTag());
            }

            @Override
            public void onFragmentDetached(FragmentManager fm, Fragment f) {
                super.onFragmentDetached(fm, f);
                Log.v("FragXX13", f.getTag());
            }
        }, true);

        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.replace(R.id.container, new TradeFragment(), "trien");
        ft.commit();

您可以在活动类中实现以下侦听器，以监视对片段后台堆栈的更改

public static interface FragmentManager.OnBackStackChangedListener  

稍后，您需要在的帮助下将此侦听器注册到片段管理器

 addOnBackStackChangedListener (FragmentManager.OnBackStackChangedListener listener)

供您参考的链接


除非将片段添加到backbackback中，否则不会调用此函数，因此无法使用OP的示例
 addOnBackStackChangedListener (FragmentManager.OnBackStackChangedListener listener)