CODEWITHSUNDEEP
androidsavestateandroid-fragments
Shaun
Shaun

Reputation: 5531

android fragment onRestoreInstanceState

Am I missing something or do Fragments not have a onRestoreInstanceState() method? If not, how do I go about attaining something similar?

Upvotes: 133

Views: 82164

Answers (5)

nhkhanh
nhkhanh

Reputation: 1569

onViewStateRestored of Fragment is the equivalent of onRestoreInstanceState of Activity. But it is called after onActivityCreated(Bundle) and before onStart().

Upvotes: 20

j2emanue
j2emanue

Reputation: 62559

onActivityCreated is deprecated. and i found it just confusing in terms of the fragment lifecycle. just do this:

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("curChoice", mCurCheckPosition);
}

// and then:

  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
            super.onViewCreated(view, savedInstanceState)
    savedIInistanceState?.let{ 
//restore the data here
    }
    }

Upvotes: 3

Andrei Zhukouski
Andrei Zhukouski

Reputation: 3506

I know, that you have accepted answer, but you should read the official documentation about fragments, and it says (paragraph "Handling the Fragment Lifecycle"):

You can retain the state of a fragment using a Bundle, in case the activity's process is killed and you need to restore the fragment state when the activity is recreated. You can save the state during the fragment's onSaveInstanceState() callback and restore it during either onCreate(), onCreateView(), or onActivityCreated()

So, you can use that suits you best: onCreate(), onCreateView(), or onActivityCreated()

Upvotes: 50

Gaurav Darji
Gaurav Darji

Reputation: 488

In Fragments guide's ListFragment example you can find:

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("curChoice", mCurCheckPosition);
}

Which you can use like this:

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    if (savedInstanceState != null) {
        // Restore last state for checked position.
        mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
    }
}

onActivityCreated() is invoked after the fragment returns back from the stack.

Upvotes: 30

mgv
mgv

Reputation: 8484

Fragments do not have an onRestoreInstanceState method.

You can achieve the same result in onActivityCreated, which receives a bundle with the saved instance state (or null).

Check the source code here.

Upvotes: 215

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