http://blog.synchack.com/2012/04/themerecreateclass.html

RecreateActivity.java

// そうそ、AndroidManifest.xmlに追加するのを忘れないでね。忘れがちだよねえｗ
public class RecreateActivity extends Activity {

    private final static String TAG_RECRIATE_NAME = "recreate_callback_class_name";

    public static Intent recreateIntent(Context ctx, String classname, Bundle outState) {
        Intent intent = new Intent(ctx, RecreateActivity.class);

        outState.putString(TAG_RECRIATE_NAME, classname);
        intent.putExtras(outState);
        intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_CLEAR_TOP);

        return intent;
    }

    public static Bundle recreateBundle(Intent intent) {
        Bundle bundle = intent.getExtras();
        if (bundle == null) {
            return null;
        }
        String classname = bundle.getString(TAG_RECRIATE_NAME);
        if (classname == null || classname.length() < 1) {
            return null;
        }
        return bundle;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle outState = getIntent().getExtras();
        if (outState == null) {
            finish();
            return;
        }

        String pname = outState.getString(TAG_RECRIATE_NAME);
        if (pname == null || pname.length() < 1) {
            finish();
            return;
        }

        try {
            Intent redirect = new Intent(getApplicationContext(), Class.forName(pname));
            redirect.putExtras(outState);
            redirect.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(redirect);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        overridePendingTransition(0, 0);
        finish();
        overridePendingTransition(0, 0);
    }
}
// ふと思ったんだがこの仕組み、メモリリークのリセットに活用できまいか。ださいけど。
// ライセンスの付加って必要？gistにある時点でほぼfree確定なんだが気にする人は気にするのかな
// 気になるならAPL 2.0で「Copyright (C) 2012 Makoto NARA (Mc.N)」でひとつ。
// まあ自由にしてよ =)