我查看了http://developer.android.com/reference/android/view/View.html,但是无法理解其中的许多内容,只能部分地理解“selected”状态。
有人能用一些具体的例子来解释它们之间的区别吗?如果我的问题不太明确,那么如果有人可以帮助我改进它,那就太好了,因为我不知道如何更清楚地提问。
先行致谢。
我查看了http://developer.android.com/reference/android/view/View.html,但是无法理解其中的许多内容,只能部分地理解“selected”状态。
有人能用一些具体的例子来解释它们之间的区别吗?如果我的问题不太明确,那么如果有人可以帮助我改进它,那就太好了,因为我不知道如何更清楚地提问。
先行致谢。
启用 -> 用户可以进行交互。
禁用 -> 用户无法进行交互。
聚焦 - (窗口,视图) 是键盘事件的目的地(是的,一些安卓设备有物理键盘),还有生成左上右下箭头键盘快捷键的"除臭球"。
已激活 - 已激活的小部件(视图)。例如,在多选列表中,选定的视图被激活。我认为在API 11中增加这个附加阶段的必要性是由于激活包含复选框的多选功能。因此,需要将选定状态和已选状态分开。
已选 - 仅适用于复选框和其他可选择的视图。
View状态的完整列表是(左侧为StateSet id,右侧为标志):
R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED,
R.attr.state_selected, VIEW_STATE_SELECTED,
R.attr.state_focused, VIEW_STATE_FOCUSED,
R.attr.state_enabled, VIEW_STATE_ENABLED,
R.attr.state_pressed, VIEW_STATE_PRESSED,
R.attr.state_activated, VIEW_STATE_ACTIVATED,
R.attr.state_accelerated, VIEW_STATE_ACCELERATED,
R.attr.state_hovered, VIEW_STATE_HOVERED,
R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT,
R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED
同时参见:
/**
* Changes the activated state of this view. A view can be activated or not.
* Note that activation is not the same as selection. Selection is
* a transient property, representing the view (hierarchy) the user is
* currently interacting with. Activation is a longer-term state that the
* user can move views in and out of. For example, in a list view with
* single or multiple selection enabled, the views in the current selection
* set are activated. (Um, yeah, we are deeply sorry about the terminology
* here.) The activated state is propagated down to children of the view it
* is set on.
*
* @param activated true if the view must be activated, false otherwise
*/
public void setActivated(boolean activated)
/**
* Dispatch a key event to the next view on the focus path. This path runs
* from the top of the view tree down to the currently focused view. If this
* view has focus, it will dispatch to itself. Otherwise it will dispatch
* the next node down the focus path. This method also fires any key
* listeners.
*
* @param event The key event to be dispatched.
* @return True if the event was handled, false otherwise.
*/
public boolean dispatchKeyEvent(KeyEvent event)