Fragment's onDestroyView called but view is not being destroyed

Question

The Android fragment lifecycle shows that when a fragment is added to the backstack and then removed/replaced, onDestroyView() is called, and later on, when the fragment returns to the layout from the backstack, onCreateView() is called.

From my understanding it means that the fragment's view is being destroyed and recreated. If the user has input text in an EditText in fragment A and goes to fragment B and then back to A, when the fragment comes back the EditText's contents will have been erased.

However, this is not happening in the following code; can anybody explain why? I have already verified that FragmentA's onDestroyView() is being called.

MainActivity.java

public class MainActivity extends FragmentActivity {

    private Fragment currentFragment = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            addFragment(new FragmentA());
        }
    }

    public void setCurrentFragment(Fragment fragment) {
        this.currentFragment = fragment;
    }

    @Override
    public void onBackPressed() {
        if (currentFragment instanceof FragmentB) {
            getSupportFragmentManager().popBackStackImmediate();
        } else {
            super.onBackPressed();
        }
    }

    public void addFragment(Fragment fragment) {
        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment).addToBackStack(null).commit();
        setCurrentFragment(fragment);
    }
}

FragmentA.java

public class FragmentA extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_a, container, false);

        final EditText editText = (EditText)view.findViewById(R.id.editText);

        Button button = (Button)view.findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentB fragmentB = new FragmentB();
                Bundle arguments = new Bundle();
                arguments.putString("text", editText.getText().toString());
                fragmentB.setArguments(arguments);
                ((MainActivity)getActivity()).addFragment(fragmentB);
            }
        });
        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        Log.d("Tag", "FragmentA.onDestroyView() has been called.");
    }
}

FragmentB.java

public class FragmentB extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_b, container, false);
        TextView textView = (TextView)view.findViewById(R.id.textView);
        textView.setText(getArguments().getString("text"));
        return view;
    }
}

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.fragmenttest.MainActivity"
    tools:ignore="MergeRootFrame" />

fragment_a.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

fragment_b.xml

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

Answer 1

Fragments in back stack retain their state in a Bundle. This includes the view hierarchy state with the current contents of EditTexts and such.