安卓：多点触摸和TYPE_SYSTEM_OVERLAY [英] Android : Multi touch and TYPE_SYSTEM_OVERLAY

问题描述

我试图让一个系统的覆盖视图多点触摸事件，但我只接受 MotionEvent.ACTION_OUTSIDE 事件。

I am trying to get multiple touch events on a system overlay view, but am only receiving the MotionEvent.ACTION_OUTSIDE event.

有没有一个系统的覆盖越来越多点触摸事件的任何可能的方式？

Is there any possible way of getting multiple touch events on a system overlay?

任何实例或链接将是非常有益的。

Any examples or links would be very helpful.

推荐答案

要创建一个覆盖视图​​，设置当的LayoutParams 您需要设置类型为 TYPE_SYSTEM_OVERLAY 和使用标志 FLAG_WATCH_OUTSIDE_TOUCH 。这presents一个问题，因为随着Android的文件规定：

To create an overlay view, when setting up the LayoutParams you need to set the type to TYPE_SYSTEM_OVERLAY and use the flag FLAG_WATCH_OUTSIDE_TOUCH. This presents a problem because as the Android documentation states:

您将不会收到完整的向下/移动/向上的姿态，先放下，作为唯一的位置的 ACTION_OUTSIDE 。

you will not receive the full down/move/up gesture, only the location of the first down as an ACTION_OUTSIDE.

为了获得你需要使用 TYPE_SYSTEM_ALERT 式触摸事件的全阵列，而这将导致覆盖接管屏幕，并停止与其他元素的相互作用。解决的办法是同时使用 TYPE_SYSTEM_OVERLAY 和 TYPE_SYSTEM_ALERT 键，通过改变的LayoutParams 需要。

In order to receive the full array of touch events you need to use the TYPE_SYSTEM_ALERT type, but this causes the overlay to take over the screen and stop interaction with other elements. The solution is to use both TYPE_SYSTEM_OVERLAY and TYPE_SYSTEM_ALERT and switch between them by changing the type of the LayoutParams as needed.

这是通过完成：

1. 观看了 ACTION_OUTSIDE 的议案事件。
2. 在遇到这样的情况，检验它是否覆盖范围内发生。
3. 如果它没有，切换的LayoutParams 键入 TYPE_SYSTEM_ALERT
4. 一旦与覆盖层的交互完成，切换回 TYPE_SYSTEM_OVERLAY
5. 重复

1. Watch for the ACTION_OUTSIDE motion event.
2. When it occurs, test if it occured within the overlay.
3. If it did, switch the LayoutParams type to TYPE_SYSTEM_ALERT
4. Once the interaction with the overlay is complete, switch back to TYPE_SYSTEM_OVERLAY
5. Repeat

有一件事要记住的是， ACTION_OUTSIDE 的议案事件总是传递到屏幕上的其他元素。因此，例如，如果叠加是在按钮的顶部，该按钮也将获得的运动事件，也没有办法阻止它

The one thing to keep in mind is that the ACTION_OUTSIDE motion event is always passed on to the rest of the elements on the screen. So, for example, if the overlay is on top of a button, that button will also receive the motion event and there is no way to stop it.

另外，还要确保你的 SYSTEM_ALERT_WINDOW 许可添加到的mainifest文件。

Also make sure you add the SYSTEM_ALERT_WINDOW permission to the mainifest file.

我已经发布了完整的解决方案在这里：
http://www.jawsware.mobi/$c$c_OverlayView/ （修订版） 的

I've posted the complete solution here:
http://www.jawsware.mobi/code_OverlayView/ (UPDATED)

这包括所有的源$ C ​​$ c和一个链接，下载整个示例项目。

It includes all the source code and a link to download the entire example project.

更新的Andr​​oid 4.0 - 2013年1月3日

要创建一个覆盖视图​​，设置时的LayoutParams的不要类型设置为 TYPE_SYSTEM_OVERLAY 。

To create an overlay view, when setting up the LayoutParams DON'T set the type to TYPE_SYSTEM_OVERLAY.

相反，它设置为 TYPE_PHONE 。

使用以下标志：

FLAG_NOT_TOUCH_MODAL

FLAG_WATCH_OUTSIDE_TOUCH

FLAG_NOT_TOUCH_MODAL ＆LT;＆LT;我发现这个是非常重要的。没有它，焦点是考虑到叠加和软键（家庭，菜单等）presses不传递到下面的活性。

FLAG_NOT_TOUCH_MODAL << I found this one to be quite important. Without it, focus is given to the overlay and soft-key (home, menu, etc.) presses are not passed to the activity below.

此外，previous链接（上图）已被更新，以反映此更新。的

Also, the previous link (above) has been updated to reflect this update.

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