为什么我要在没有代码的情况下调用 super

Question

当我调查 AppCompatActivity.java 以研究 API 时 我发现 onSupportActionModeStarted() 需要覆盖方法来调用 super.method()。即使没有代码。你有什么线索吗？

/**
 * Notifies the Activity that a support action mode has been started.
 * Activity subclasses overriding this method should call the superclass implementation.
 *
 * @param mode The new action mode.
 */
@Override
@CallSuper
public void onSupportActionModeStarted(@NonNull ActionMode mode) {
}

Answer 1

今天，AppCompatActivityonSupportActionModeStarted()没有。通过添加 @CallSuper，Google 表示 "in the future, we might put code here, so please call through to the superclass implementation, so that your app does not break in the future"。