Android 在FragmentTagManger中获取后退按钮事件的当前片段

我使用FragmentTagManager，现在我想访问当前活动的片段，并在按下后退按钮时调用一个方法

我想得到的片段是一个容器。因为我在选项卡中动态地更改片段，所以我需要访问容器并从其超类调用方法，而不能直接从FragmentStack中弹出（）

如何访问选项卡中显示的当前片段

现在我有这个

主类 Basecontainer.xml

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我希望你能同时找到一个解决方案，因为你的问题在3个月前发布了。尽管如此，我还是面临着同样的问题，并提出了这个解决方案

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如果要覆盖，则可以使用OnBackbackChangedListener了解片段堆栈何时发生更改，而不考虑设置/取消设置片段堆栈的方法，如图所示：

getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
            //TODO: Handle your stacks changes here
            Log.d(Constants.TAG,"Stack Entry Count: "+getSupportFragmentManager().getBackStackEntryCount());
        }
    });

问候-

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</FrameLayout>

public class MusicListContainerFragment extends BaseContainerFragment {
    private boolean mIsViewInited;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.base_container, null);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (!mIsViewInited) {
            mIsViewInited = true;
            initView();
        }
    }

    private void initView() {
        replaceFragment(new MusicListFragment(), false);
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // this takes the user 'back', as if they pressed the left-facing triangle icon on the main android toolbar.
            // if this doesn't work as desired, another possibility is to call `finish()` here.
            if (getFragmentManager().findFragmentById(R.id.activity_profile) instanceof FragmentOfYourChoice) {
                onBackPressed();
                return true;
            }
            else
                super.onOptionsItemSelected(item);

        default:
            return super.onOptionsItemSelected(item);
    }
}

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() > 1)
        getFragmentManager().popBackStack();
    else
        super.onBackPressed();
}

getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
            //TODO: Handle your stacks changes here
            Log.d(Constants.TAG,"Stack Entry Count: "+getSupportFragmentManager().getBackStackEntryCount());
        }
    });