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POAndroid multitouch! hack anyone?
 

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    <p>I have to let this slip for now as a purely academic issue but i would very much like to see a solution in near time.</p> <p>Due to the way that Android handles multitouch you can (as i see it) only trap the event in a single view. I've tried an hack for this envolving a container layout that intercepts the events sees what View it belongs by seeing the coords and changing the action itself so that it seems to the component that it's a single touch event. I compose such events and then route it to the Views.</p> <p>Does anyone have a better idea to do this?</p> <p>If someone wants the code for what i described above just ask and i post it!</p> <p>Have fun and good luck :D JQCorreia</p> <pre><code>public class Container extends LinearLayout { LinkedHashMap&lt;Integer,View&gt; pointers = new LinkedHashMap&lt;Integer,View&gt;(); ArrayList&lt;View&gt; views = new ArrayList&lt;View&gt;(); public Container(Context context) { super(context); initialize(context); } public Container(Context context, AttributeSet attrs) { super(context, attrs); initialize(context); } private void initialize(Context context) { } @Override public void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); views = LayoutUtil.flattenLayout(this,false); for(View foo : views) { Rect rect = new Rect(); foo.getGlobalVisibleRect(rect); } } @Override public boolean onInterceptTouchEvent(MotionEvent event) { return true; } @Override public boolean onTouchEvent(MotionEvent event) { int action = event.getAction() &amp; MotionEvent.ACTION_MASK; if(action==MotionEvent.ACTION_DOWN) { for(View v: views) { Rect r = new Rect(); v.getGlobalVisibleRect(r); if (event.getX() &gt; r.left &amp;&amp; event.getX() &lt; r.right &amp;&amp; event.getY() &gt; r.top &amp;&amp; event.getY() &lt; r.bottom) { pointers.put(event.getPointerId(0),v); pointers.get(event.getPointerId(0)).onTouchEvent(event); break; } } } if(action==MotionEvent.ACTION_POINTER_DOWN) { int pid = event.getAction() &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; int index = event.findPointerIndex(pid); for(View v: views) { Rect r = new Rect(); v.getGlobalVisibleRect(r); if (event.getX(index) &gt; r.left &amp;&amp; event.getX(index) &lt; r.right &amp;&amp; event.getY(index) &gt; r.top &amp;&amp; event.getY(index) &lt; r.bottom) { pointers.put(pid,v); MotionEvent copy = MotionEvent.obtain(event); copy.setAction(MotionEvent.ACTION_DOWN); copy.setLocation(event.getX(index), event.getY(index)); pointers.get(pid).onTouchEvent(copy); } } } if(action==MotionEvent.ACTION_POINTER_UP) { int pid = event.getAction() &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; int index = event.findPointerIndex(pid); if(pointers.get(pid)!=null) // If the touch was outside any view { MotionEvent copy = MotionEvent.obtain(event); copy.setAction(MotionEvent.ACTION_UP); pointers.get(pid).onTouchEvent(copy); pointers.remove(pid); } } if(action==MotionEvent.ACTION_MOVE) { for(int i = 0; i&lt;event.getPointerCount();i++) { int pid = event.getPointerId(i); MotionEvent copy = MotionEvent.obtain(event); copy.setLocation(event.getX(i), event.getY(i)); if(pointers.get(pid)==null) continue; // If the touch was outside any view pointers.get(pid).onTouchEvent(copy); } } if(action==MotionEvent.ACTION_UP) { if(pointers.get(event.getPointerId(0))!=null) { pointers.get(event.getPointerId(0)).onTouchEvent(event); pointers.remove(event.getPointerId(0)); } } return true; } } // This is the LayoutUtil.flattenLayout method public static ArrayList&lt;View&gt; flattenLayout(View view, boolean addViewGroups) { ArrayList&lt;View&gt; viewList = new ArrayList&lt;View&gt;(); if(view instanceof ViewGroup) { if(((ViewGroup)view).getChildCount()==0) viewList.add(view); else { if(addViewGroups) { viewList.add(view); } ViewGroup viewgroup = (ViewGroup) view; for(int i = 0; i &lt; viewgroup.getChildCount();i++) { viewList.addAll(flattenLayout(viewgroup.getChildAt(i),false)); } } } else if(view instanceof View) { viewList.add(view); } return viewList; } </code></pre>
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    1. COThis changed in Android 3.0 (http://developer.android.com/sdk/android-3.0.html), you can use `android:splitMotionEvents` or `android:windowEnableSplitTouch`. For applications for before Honeycomb, I would override the `onInterceptTouchEvent` method of the `ViewGroup`.
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      1. USJoseph Earl
    2. COThanks man i didn't knew that...
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    3. COBut anyway until we have 3.0 in the majority of the devices this thread could be a 'tank' of solutions to this problem. At least it was my idea :D
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