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PreferenceScreen not being restored on orientation change
public class HelloAndroid extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Button view = new Button(this);
        view.setText("Start Preference");
        final Context ctx = this;
        view.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(ctx, HelloPreferenceActivity.class));
            }
        });
        this.setContentView(view);
    }

public class HelloPreferenceActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <CheckBoxPreference android:key="examplePref"
        android:title="ExamplePref">
    </CheckBoxPreference>
    <PreferenceScreen android:title="SubScreen..."
        android:key="dummy"> <!-- works with, does not work without this key -->
        <CheckBoxPreference android:key="exPrefSubScreen"
            android:title="ExPrefSubScreen">
        </CheckBoxPreference>
    </PreferenceScreen>
</PreferenceScreen>

void dispatchSaveInstanceState(Bundle container) {
    if (hasKey()) {
        mBaseMethodCalled = false;
        Parcelable state = onSaveInstanceState();
        if (!mBaseMethodCalled) {
            throw new IllegalStateException(
                    "Derived class did not call super.onSaveInstanceState()");
        }
        if (state != null) {
            container.putParcelable(mKey, state);
        }
    }
}

void dispatchRestoreInstanceState(Bundle container) {
    if (hasKey()) {
        Parcelable state = container.getParcelable(mKey);
        if (state != null) {
            mBaseMethodCalled = false;
            onRestoreInstanceState(state);
            if (!mBaseMethodCalled) {
                throw new IllegalStateException(
                        "Derived class did not call super.onRestoreInstanceState()");
            }
        }
    }
}