How to go back from one Activity to one Fragment?

Question

I have a Main Activity that extends to AppCompatActivity, which contains a FrameLayout and I used to replace it with the desire Fragment.

However, at one time, I called another activity only to show up some specific information, and need to pass back that information to the Main Activity with the last Fragment showed. Thus, I tried to use FragmentManager, and the Fragment shows transparent; also, if I used that, I lost the Main Activity's FrameLayout id.

To try to clarify, I will put a scheme:

Is possible to use onBackPressed to solve it?

UPDATE

Below is my onActivityResult that calls startActivityForResult, which is used in a Fragment.

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

    if (requestCode == 2) {
        if (resultCode == Activity.RESULT_OK) {

            execusaoVistoria.fotos = allFotos;

            Intent startPreview = new Intent(getContext(), PreviewActivity.class);
            startPreview.putExtra("path", fileName.toString());
            startPreview.putExtra("ExecusaoVistoria", execusaoVistoria);
            startActivityForResult(startPreview, 10);

        }
    } else if (requestCode == 10) {

        if (resultCode == Activity.RESULT_OK) {

            allFotos.add((Fotos) data.getBundleExtra("Bundle").getParcelable("foto"));

        }
    }

}

And here, is the code from the Activity that calls the setResult:

Intent i = new Intent();
i.putExtra("Bundle", bundle);
setResult(Activity.RESULT_OK, i);
finish();

score 4 · Accepted Answer · edited May 23 '17 at 12:24

4

You should use startActivityForResult instead of startActivity.

In your MainActivity you will receive a callback

onActivityResult()

here you can fetch the info you need.

How to manage `startActivityForResult` on Android?

edited May 23 '17 at 12:24

Community

1
1

answered Jun 14 '16 at 13:25

Arpit Ratan

2,976
1
12
20

It worked by using your tip. However, as I finish the other activity, I need to find a way to get the result on OnCreate. – Tarcisiofl Jun 14 '16 at 13:54
OnCreate doesn't gets called when you go back to the activity. You put the logic is onResume() may be – Arpit Ratan Jun 14 '16 at 14:50

score 0 · Answer 2 · answered Jun 14 '16 at 14:11

There are 2 solutions to what you can do based on what you want to achieve with it. You can open the second Activity with startActivityForResult from inside your fragment and handle the result in your fragment's onActivityResult method.

The second is to handle the result from inside your activity using the same methods of the activity.

In both cases what you are called to do is to call startActivityForResult(yourIntent, yourRequestCode) to open the requested activity. In the activity that was opened, when you are finished and have gotten the result you have to call

Intent resultIntent = new Intent();
//in case you do not need to pass data back you can skip this
resultIntent.setExtra("extra_result", extraData);
setResult(resultCode,yourResultIntent);
finish();

When this returns you to the previous activity the onActivityResult(resultCode,requestCode) method will be called with the request code you specified when starting the activity and the result code you set when calling setResult.

In order to handle the result inside the fragment you need to override the onActivityResult method in your Activity and call through to the super.onActivityResult and also override the method inside the fragment. In this case you will handle the result there.

The thing that you need to watch out for is to call the startActivityForResult of the actual handler of the result.

If you want to see a full sample of the basic interaction you can check it at https://developer.android.com/training/basics/intents/result.html

Thank you Krzysztof! In the onActivityResult, I have 2 requestCode, each one doing your own operation. However, it appears that it is not going to the specific requestCode each time. Sometimes, nothing happens! — Tarcisiofl, Jun 14 '16 at 14:29
can you post the code where you call the `startActivityForResult` and the code calling the setResult? — Krzysztof Dubrowski, Jun 14 '16 at 14:31
I think that sometimes, it appears to mess with the resultCode. — Tarcisiofl, Jun 14 '16 at 14:49
I added getActivity(). startActivityForResult, and it works! — Tarcisiofl, Jun 14 '16 at 14:53

score 0 · Answer 3 · answered Jun 14 '16 at 14:48

0

try out using intent in fragment as Intent i=new Intent(getActivity(), anotherActivity.class); startActivityForResult(i);

and for back process, declare parent activity as your main activity in manifest.

answered Jun 14 '16 at 14:48

prashantB

25
6

How to go back from one Activity to one Fragment?

3 Answers3