Android 安卓：焦点状态、启用状态、按下状态和选定状态之间有什么区别？

我看了看，想找出其中的差别，但不太明白。我只是部分理解了“选定”状态

有人能用一些具体的例子来解释这些区别吗？我希望我的问题不是很含糊。如果是的话，如果有人能帮我改进它就太好了，因为我不知道如何更清楚地问它

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提前感谢。

已启用->用户交互可能

已禁用->无法进行用户交互

• 如果将鼠标悬停在小部件上，则该小部件已聚焦
• 如果您在该小部件上按下（半点）按钮，它将被按下
• 如果在鼠标处于同一位置时按下向下键和向上键，则会选择

聚焦-（窗口，视图）是键盘事件的目的地（是的，有些机器人有物理键盘），有些机器人有“除臭剂球”生成左上右下箭头的键盘快捷键

已激活-已激活的小部件（视图）。例如，在多选列表中，所选视图被激活。我相信API 11中这个附加阶段的必要性是因为激活了包含复选框的多重选择。因此，所选状态和选中状态需要分开

选定-仅适用于复选框和其他可选视图

视图状态的完整列表为（左侧为状态集id，右侧为标志）：

另见：

/**
 * 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)

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谢谢你的澄清！我仍然不清楚聚焦状态：在触摸屏上聚焦状态是如何工作的？它是这样的：当我在屏幕上移动手指时，我的手指在任何特定的时刻都在哪里，屏幕的那一部分有焦点？但是对于触摸输入，你通常只需要注意选择的状态，对吗@EnginYapici我认为文本字段在等待输入时是聚焦的。使用触摸输入时，您需要注意按下和选择的状态。如果触碰发生在小部件内部，而触碰发生在小部件外部，则不认为选择了触碰。实际上，“聚焦”也适用于触碰界面。如果屏幕上有多个重叠的半透明视图（例如片段），则所有桌面范例都适用。此外，新的安卓设备配备了接近传感器，即使没有鼠标，“悬停”也有意义。按下/选择启用/禁用是过于简单化了。嗯，是的，我们对这里的术语深表歉意。

/**
 * 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)