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POAndroid touch input delay problems for a timing critical game. Is there a delay before onTouchEvent is called?
 

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  1. POAndroid touch input delay problems for a timing critical game. Is there a delay before onTouchEvent is called?
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    <p>So we're working on the android version of the iPhone game Snake Race (it's a cool game). However, we seem to be getting a delay on the touch inputs just big enough to make a difference. (The snake might turn a step later than you intended) After getting almost used to the android version, the iPhone version feels like a blessing. </p> <p>The question is whether there is a delay from androids side in calling the onTouchEvent() method? (I'm using Samsung Galaxy S2) If so, is there any neat tricks to circumvent the issue?(Even if it means using the NDK)</p> <p>This is the current implementation touch handling:</p> <pre><code>public boolean onTouchEvent(final MotionEvent event) { int action = event.getAction(); if(action == MotionEvent.ACTION_DOWN || (action &amp; MotionEvent.ACTION_MASK) == MotionEvent.ACTION_POINTER_DOWN){ Run run = GameVars.run; if(run != null){ if(run.paused){ run.paused = false; }else{ if(event.getX(action &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT) &lt; GameVars.width/2){ run.addTap(-1); }else{ run.addTap(1); } } } return true; } return false; } </code></pre> <p>This is the addTap method:</p> <pre><code>public void addTap(int newDir) { if(newDir == -tapDir){ taps++; tapDir *= -1; } } </code></pre> <p>And then every frame, taps is checked, and if it's greater than zero (and we're allowed to turn atm) we turn. </p> <p>It all works fine and is reliable, but there is a consistent delay (maybe 2-3 frames, which is enough to make the iPhone snake seriously more maneuverable).</p> <p>Any feedback is apprieciated!</p>
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    1. USAndreas Løve Selvik
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    1. COI'm not sure but maybe, it waits a few milliseconds to see if it was a drag event or just a click event. Not sure how android system works though. You could try looking into that
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      1. USdchhetri
    2. COAnecdotally, the Galaxy Note seems to have terrible input lag on its home screen. I'm not sure whether the problem is Android or the device. I'm curious as to whether Project Butter made any difference to input lag for apps.
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      1. POAndroid touch input delay problems for a timing critical game. Is there a delay before onTouchEvent is called?
      1. USftvs
    3. COI'm also looking forward to testing Jelly Bean, and see whether they managed to improve it, and by how much. I'll see if I can do a methodical test once I get a jelly bean rom for my S2.
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      1. USAndreas Løve Selvik
 

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