如何在片段中保存此TextView的实例状态？

private TextView mTextView;

mTextView = findViewById(R.id.textView);

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putCharSequence("text", mTextView.getText());
}

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

    if (savedInstanceState != null) {
        CharSequence text = savedInstanceState.getCharSequence("text");
        mTextView.setText(text);
    }
}