类分层结构
- java.lang.Object
- com.app.user.World.widget.CustomTimer
- com.app.user.World.widget.HandlerTimer
- androidx.recyclerview.widget.RecyclerView.ItemDecoration
- android.view.View (implements android.view.accessibility.AccessibilityEventSource, android.graphics.drawable.Drawable.Callback, android.view.KeyEvent.Callback)
- android.view.ViewGroup (implements android.view.ViewManager, android.view.ViewParent)
- android.widget.FrameLayout
接口分层结构