如何保存单选按钮的状态

Question

我制作了 4 个单选按钮，并希望在单击其中任何一个按钮时保存状态，然后希望在应用程序中使用该保存状态。我该怎么做？

                    myOption1.setChecked(true);
        myOption2.setChecked(true);
        myOption3.setChecked(true);
        myOption4.setChecked(true);

Answer 1

在您的活动中覆盖onSaveInstanceState()和onRestoreInstanceState()。

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  savedInstanceState.putBoolean("myOption1", myOption1.isChecked());
  savedInstanceState.putBoolean("myOption2", myOption2.isChecked());
  savedInstanceState.putBoolean("myOption3", myOption3.isChecked());
  savedInstanceState.putBoolean("myOption4", myOption4.isChecked());
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  myOption1.setChecked(savedInstanceState.getBoolean("myOption1"));
  myOption2.setChecked(savedInstanceState.getBoolean("myOption2"));
  myOption3.setChecked(savedInstanceState.getBoolean("myOption3"));
  myOption4.setChecked(savedInstanceState.getBoolean("myOption4"));
}