blocks|key|3798494|text|请确保在交换机中包含MotionEvent.ACTION_MASK。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3798495|switch(event.getAction()+&+MotionEvent.ACTION_MASK){
case+MotionEvent.ACTION_DOWN:
some+code
break;
case+MotionEvent.ACTION_POINTER_DOWN:
ETC|code-block|syntax|javascript|3798496|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

be sure to include MotionEvent.ACTION_MASK in your switch. For example:

<pre><code>switch(event.getAction() &amp; MotionEvent.ACTION_MASK){
case MotionEvent.ACTION_DOWN:
some code
break;
case MotionEvent.ACTION_POINTER_DOWN:
ETC
</code></pre>

blocks|key|3798472|text|面对同样的问题，当我触摸第二个手指时，在我的应用程序中触发了ACTION_POINTER_2_DOWN，在触发ACTION_MOVE之后，getAction()方法给出了需要根据这个列表进行检查的事件编号|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3798473|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

faced the same issue
turned out that ACTION_POINTER_2_DOWN was being fired in my app when i touched the second finger and after that ACTION_MOVE was fired
the getAction() method gives the event number which needs to be checked against this list

blocks|key|3798431|text|我在我的项目中也遇到了同样的问题。如果我触摸屏幕，而我的手指离屏幕太近，系统就不能实现多点触摸事件。我认为这是因为当你的手指离得太近时，系统会将其视为单个手指。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3798432|也许你可以用getSize()方法来检验这个假设，当你用一根手指触摸屏幕时，以及当你用两个手指靠近屏幕触摸屏幕时，估计屏幕被按下的面积。|offset|length|3798433|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/view/MotionEvent.html#getSize%2528int%2529^0|0|6|9|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I had the same issue in my project. If i touch the screen and my fingers are too close togheter the system doesn't realize a multitouch event. I think that is because when your fingers are too close togheter the system sees it as a single finger.

Maybe you can check this assumption using <a href="http://developer.android.com/reference/android/view/MotionEvent.html#getSize%28int%29" rel="nofollow noreferrer">getSize()</a> method to estimate the area of the screen being pressed when you touch the screen with a single finger and when you touch the screen with two finger close togheter.

blocks|key|2390630|text|原来是自定义ROM的问题，我已经闪存到我的Evo。再次感谢hara的建议，因为这是我的另一个bug。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2390631|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Turned out to be a problem with the Custom ROM I had flashed to my Evo. Thanks again to hara for their advice as that turned out to be another bug I had.

blocks|key|713832|text|我已经用这个解决了同样的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|713833|switch(event.getActionMasked())+{
+++case+MotionEvent.ACTION_POINTER_DOWN:
++++++//your+code
+++break;
}|code-block|syntax|javascript|713834|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have solved the same issue with this:

<pre><code>switch(event.getActionMasked()) {
 case MotionEvent.ACTION_POINTER_DOWN:
 //your code
 break;
}
</code></pre>

blocks|key|3798543|text|我注意到，如果事件(OnTouch)方法返回的是真正的，就会触发这个(MotionEvent.ACTION_POINTER_DOWN)案例，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3798544|@Override
public+boolean+onTouchEvent(MotionEvent+event)+{

++++switch(motionEvent.getAction()+&+MotionEvent.ACTION_MASK)+{
+++++++case+MotionEvent.ACTION_POINTER_DOWN:
++++++++//your+code
+++++++break+;
++++}
++++return+true;
}|code-block|syntax|javascript|3798545|注意:只有当onTouch()方法返回布尔值作为super.onTouchEvent(event);时，才会侦听MotionEvent.ACTION_DOWN，因此请确保返回为true以避免这种情况。|3798546|entityMap^0|7|K|0|0|O|Q|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

I've noticed that this(MotionEvent.ACTION_POINTER_DOWN) case being fired if onTouch(event) method has returned as true as given below:

<pre><code>@Override
public boolean onTouchEvent(MotionEvent event) {

 switch(motionEvent.getAction() &amp; MotionEvent.ACTION_MASK) {
 case MotionEvent.ACTION_POINTER_DOWN:
 //your code
 break ;
 }
 return true;
}
</code></pre>

Note:
MotionEvent.ACTION_DOWN only getting listened if onTouch() method has returned a boolean value as return super.onTouchEvent(event); so make sure as true to avoid this situation.

blocks|key|2390751|text|@taylers在Kotlin中回答|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2390752|when+(event.actionMasked+and+event.action)+{
++++MotionEvent.ACTION_DOWN+->+{
++++++++Some+code
++++++++This+is+fired+when+first+finger+touches+screen.
++++}
++++MotionEvent.ACTION_POINTER_DOWN+->+{
++++++++Some+code
++++++++This+is+fired+when+second+finger+touches+the+screen.
++++}
++++MotionEvent.ACTION_UP+->+{
++++++++Some+code
++++++++This+is+fired+when+first+finger+is+lifted.
++++}
++++MotionEvent.ACTION_POINTER_UP+->+{
++++++++Some+code
++++++++This+is+fired+when+second+finger+is+lifted.
++++}
}|code-block|syntax|javascript|2390753|entityMap^0|9|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

@taylers answer in Kotlin
<pre><code>when (event.actionMasked and event.action) {
 MotionEvent.ACTION_DOWN -&gt; {
 Some code
 This is fired when first finger touches screen.
 }
 MotionEvent.ACTION_POINTER_DOWN -&gt; {
 Some code
 This is fired when second finger touches the screen.
 }
 MotionEvent.ACTION_UP -&gt; {
 Some code
 This is fired when first finger is lifted.
 }
 MotionEvent.ACTION_POINTER_UP -&gt; {
 Some code
 This is fired when second finger is lifted.
 }
}
</code></pre>

I'm trying to implement pinch-zoom in an app I'm making and am having issues with the onTouch event. It appears that the pointer up &amp; down actions do not fire immediately, like you won't get a pointer up or down until an action move occurs. So what happens if both fingers hit the screen nearly simultaneously is that the 2nd finger (should be pointer(1)) gets a move action before pointer down is called, making the code think it's a DRAG not a pinch zoom. Anyone else seen this? Anyway around it? Thanks.

onTouch event sometimes not firing ACTION_POINTER_DOWN

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文章&问答评论现已支持表情

我正在尝试在我正在制作的一个应用程序中实现收缩缩放，但在onTouch事件上遇到了问题。看起来指针向上和向下的动作不会立即触发，就像你不会得到一个向上或向下的指针，直到动作移动发生。因此，如果两个手指几乎同时点击屏幕，会发生什么情况是第二个手指(应该是pointer(1))在调用pointer down之前获得一个移动动作，使代码认为这是拖动而不是收缩缩放。还有人看过这个吗？不管怎么说，在它周围？

问onTouch事件有时不会触发ACTION_POINTER_DOWN
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问onTouch事件有时不会触发ACTION_POINTER_DOWN
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