儿童视图焦点改变机器人

Question

I have a ViewGroup that can have many LinearLayout s. And each LinearLayout can have many nested child views. What I want is that, if any view(even deep nested) inside a LinearLayout gets focus, it should call a custom method of its main parent LinearLayout .

The last thing I want to do is, set OnFocusChangeListener on every single deep nested child views of LinearLayout and that listener will call its parent's custom method. But that is really bad way to go for.

Is there any method I can override of parent LinearLayout that gets called every time its any nested child view's focus changes ?

Answer 1

您可以使用contentView.getViewTreeObserver().addOnGlobalFocusChangeListener()或覆盖根ViewGroup的ViewGroup.requestChildFocus() （ requestChildFocus()沿视图父链传递）。