startActivityForResult() from a Fragment and finishing child Activity, doesn't call onActivityResult() in Fragment

问题

FirstActivity.Java has a FragmentA.Java which calls startActivityForResult(). SecondActivity.Java call finish() but onActivityResult never get called which is written in FragmentA.Java.

FragmentA.Java code:

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    // some code
    Intent i = new Intent(getActivity(), SecondActivity.class);
    i.putExtra(\"helloString\", helloString);
    getActivity().startActivityForResult(i, 1);
  }

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    getActivity();
    if(requestCode == 1 && resultCode == Activity.RESULT_OK) {
       //some code
    }
  }

SecondActivity.Java code:

  @Override
  protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       //some code
       Intent returnIntent = new Intent();
       returnIntent.putExtra(\"result\", result);                          

       setResult(Activity.RESULT_OK,returnIntent);     
       finish();
  }

I have tried debugging the code, but onAcitvityResult() never get called.

回答1:

You must write onActivityResult() in your FirstActivity.Java as follows

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

So this will call your fragment's onActivityResult()

Edit: the solution is to replace getActivity().startActivityForResult(i, 1); with startActivityForResult(i, 1);

回答2:

Kevin's answer works but It makes it hard to play with the data using that solution.

Best solution is don't start startActivityForResult() on activity level.

in your case don't call getActivity().startActivityForResult(i, 1);

Instead, just use startActivityForResult() and it will work perfectly fine! :)

回答3:

You must write onActivityResult() in your FirstActivity.Java as follows

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    for (Fragment fragment : getSupportFragmentManager().getFragments()) {
        fragment.onActivityResult(requestCode, resultCode, data);
    }
}

This will trigger onActivityResult method of fragments on FirstActivity.java

回答4:

The fragment already has startActivityForResult, which would call onActivityResult in the fragment if you use it, instead of getActivity()...

回答5:

The most important thing, that all are missing here is... The launchMode of FirstActivity must be singleTop. If it is singleInstance, the onActivityResult in FragmentA will be called just after calling the startActivityForResult method. So, It will not wait for calling of the finish() method in SecondActivity.

So go through the following steps, It will definitely work as it worked for me too after a long research.

In AndroidManifest.xml file, make launchMode of FirstActivity.Java as singleTop.

<activity
        android:name=".FirstActivity"
        android:label="@string/title_activity_main"
        android:launchMode="singleTop"
        android:theme="@style/AppTheme.NoActionBar" />

In FirstActivity.java, override onActivityResult method. As this will call the onActivityResult of FragmentA.

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

In FragmentA.Java, override onActivityResult method

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d("FragmentA.java","onActivityResult called");
}

Call startActivityForResult(intent, HOMEWORK_POST_ACTIVITY); from FragmentA.Java

Call finish(); method in SecondActivity.java

Hope this will work.

回答6:

We could call startActivityForResult() directly from Fragment So You should call this.startActivityForResult(i, 1); instead of getActivity().startActivityForResult(i, 1);

Intent i = new Intent(getActivity(), SecondActivity.class);
i.putExtra("helloString", helloString);
this.startActivityForResult(i, 1);

Activity will send the Activity Result to your Fragment.

回答7:

onActivityResult() of MAinActivity will call , onActivityResult() of Fragement wont call because fragment is placed in Activity so obviously it come back to MainActivity

回答8:

May it's late for the answer. But will be helpful for anyone.

In My case want to call activity from Fragment and setResult back from the fragment.

I have used getContext of Fragment Like.

startActivityForResult(new Intent(getContext(), NextActivity.class), 111);

And Set Result from Fragment

getActivity().setResult(Activity.RESULT_OK);
                    getActivity().finish();

Now Getting Result to Fragment with

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK && requestCode == 111) {

    }
}

回答9:

Don't call finish() in onCreate() method then it works fine.

回答10:

call your onActivityresult() in ParentActivity .

来源：https://stackoverflow.com/questions/17085729/startactivityforresult-from-a-fragment-and-finishing-child-activity-doesnt-c