onActivityResult 不在 Fragment 中调用

Question

应用的结构是这样的：

tabHost (in Activity) -> contains -> TabFragment(extend base container fragment)

1. Activity中的代码：

tabHost.addTab(
                tabHost.newTabSpec("home").setIndicator("",
                        getResources().getDrawable(R.drawable.btn_home)),
                HomeFragment.class, null);

2。 HomeFragment 中的代码 （注意 HomeFragment 并不是真正的函数，而是一个像这样的容器，它扩展了 BaseContainerFragment）：

public class HomeFragment extends BaseContainerFragment {

    public Home homeFrag;
    private boolean mIsViewInited;

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

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

    private void initView() {
        homeFrag = new Home();
        replaceFragment(homeFrag, false);
    }

}

3. BaseContainerFragment

public class BaseContainerFragment extends Fragment {

    public void replaceFragment(Fragment fragment, boolean addToBackStack) {
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        if (addToBackStack) {
            transaction.addToBackStack(null);
        }
        transaction.replace(R.id.container_framelayout, fragment);
        transaction.commit();
    }

    public boolean popFragment() {
        boolean isPop = false;
        if (getChildFragmentManager().getBackStackEntryCount() > 0) {
            isPop = true;
            getChildFragmentManager().popBackStack();
        }
        return isPop;
    }

}

4.在首页（片段的实际内容）

UploadType fragment = new UploadType();
                    Bundle bundle = new Bundle();
                    bundle.putString("form_type", "request");
                    fragment.setArguments(bundle);
                    ((BaseContainerFragment)getParentFragment()).replaceFragment(fragment, true);

5.在 UploadType 中，我调用相机活动，但 onActivityResult 仅在主要活动中返回。

startActivityForResult(intent, REQUEST_CAMERA);

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.d("test1", "result2");
        super.onActivityResult(requestCode, resultCode, data);
}

如何在 UploadType 触发 onActivityResult？感谢您的帮助。

Answer 1

这不起作用的原因是因为您从嵌套片段中调用startActivityForResult()。 Android 足够聪明，可以将结果路由回Activity 甚至Fragment，但不会路由到嵌套的Fragment，因此您没有收到回调。 （更多关于为什么这不起作用here 或stackoverflow 的信息）

现在为了使其正常工作，我建议您手动将回调路由到 ParentFragment (=BaseContainerFragment) 中的 ChildFragment (=UploadType)：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Fragment uploadType = getChildFragmentManager().findFragmentById(R.id.container_framelayout);

    if (uploadType != null) {
        uploadType.onActivityResult(requestCode, resultCode, data);
    }
    super.onActivityResult(requestCode, resultCode, data);
}

Answer 2

在我的情况下，我通过在我的MainActivity.java 中添加以下代码来完成

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    for (Fragment fragment : getSupportFragmentManager().getFragments()) {
        fragment.onActivityResult(requestCode, resultCode, data);
    }
}

Answer 3

在你的 Activity Override onActivityForResult() 像这样

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
    }

现在在您的片段中，您可以在其中获取活动结果

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      Log.d("test1", "result2");
    }

确保你在片段中调用 start ActivityForResult 时应该是这样的

startActivityForResult(intent, REQUEST_CAMERA);

Answer 4

导航架构组件的NavHostFragment

如果您使用单个活动并且在NavHostFragment 中有片段，则存在NavHostFragment 的子片段的onActivityResult() 没有被调用的问题。

要解决此问题，您需要从宿主活动的onActivityResult() 内部手动调用子片段的onActivityResult()。主机活动是托管您的NavHostFragment 的活动。

这是您的主机活动onActivityResult() 的 Kotlin 代码：

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    val navHostFragment = supportFragmentManager.findFragmentById(R.id.your_nav_host_fragment)
    val childFragments = navHostFragment?.childFragmentManager?.fragments
    childFragments?.forEach { it.onActivityResult(requestCode, resultCode, data) }
}

Answer 5

TabActivity->ActivityA->FragmentB，不行。

用坏坏坏的方法：

ActivityA.java

public void onSelectSomething(){

    ...

    startActivityForResult(intent, 22222);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (mFragment != null) {
        mFragment.onActivityResult(requestCode, resultCode, data);
    }
}

FragmentB.java

if(getActivity() instanceof ActivityA) {
    ((RepairerListActivity)getActivity()).onSelectSomething();
} 


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 22222) {
        // do things
    }
}   

Answer 6

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Loop through all child fragments of the activity
    for (Fragment fragment : getSupportFragmentManager().getFragments()) {

        // check if the current fragment is YourFragment
        if (fragment instanceof YourFragment ) {
            fragment.onActivityResult(requestCode, resultCode, data);
        }

    }
}