Question

static class SavedState extends BaseSavedState {
  boolean checked;
  SavedState(Parcelable superState) {
    super(superState);
  }

  private SavedState(Parcel in) {
    super(in);
    checked = (Boolean)in.readValue(null);
  }

  @Override
  public void writeToParcel(Parcel out, int flags) {
    super.writeToParcel(out, flags);
    out.writeValue(checked);
  }

  public static final Parcelable.Creator<SavedState> CREATOR
      = new Parcelable.Creator<SavedState>() {
    public SavedState createFromParcel(Parcel in) {
      return new SavedState(in);
    }

    public SavedState[] newArray(int size) {
      return new SavedState[size];
    }
  };
}

@Override
public Parcelable onSaveInstanceState() {
  Parcelable superState = super.onSaveInstanceState();
  SavedState ss = new SavedState(superState);
  ss.checked = isChecked();
  return ss;
}

@Override
public void onRestoreInstanceState(Parcelable state) {
  SavedState ss = (SavedState) state;

  super.onRestoreInstanceState(ss.getSuperState());
  setChecked(ss.checked);
  requestLayout();
}

保存状态是自定义一个 SavedState，继承自 BaseSavedState，然后 Parcelable 将 Boobean 类型 checked 属性序列化，判断是否选中，在 onSaveInstanceState() 中，保存，然后在 onRestoreInstanceState() 获取序列化的属性，重新调用 setChecked() 设置属性。