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    <p>I researched the code of <code>DrawerLayout</code> and found the next issue: When we touch the edge of screen there appears small (20*density px) part of the <code>drawer</code> (it makes moving drawer easier). It doesn't appears immediatly, but after a certain interval (160 ms) of time. It is realized by <code>postDelayed</code>. </p> <p>The <code>drawer</code> can be in several states: <code>IDLE</code>, <code>DRAGGING</code> and <code>SETTLING</code>. If it was in the <code>DRAGGING</code> state, it cannot return to this state anymore with the same pointer and edge (because there is a condition: <code>mEdgeDragsInProgress[pointerId] &amp; edge) == edge</code> which doesn't allow to drag the edge which have been dragging already). </p> <p>So in some cases the drawer have moved to the state <code>DRAGGING</code> already when delayed <code>Runnable</code> is executing. This delayed action opens <code>drawer</code> for 20*density px and change state of <code>drawer</code>. So <code>drawer</code> cannot be moved anymore (because it cannot return to the state <code>DRAGGING</code>).</p> <p>There is a code for cancelling delayed action (which opens drawer), but this code in the method <code>onInterceptTouchEvent</code>, which is called only once (because it returns <code>false</code>). I think this code should be in the method <code>onTouchEvent</code>.</p> <p>Unfortunatly I didn't find any way to cancel delayed event (because it has <code>private</code> modifier and I can't get it). So only one way I found: copy the source code of <code>DrawerLayout</code> to my project and make this small change: copy </p> <pre><code>case MotionEvent.ACTION_MOVE: { // If we cross the touch slop, don't perform the delayed peek for an edge touch. if (mLeftDragger.checkTouchSlop(ViewDragHelper.DIRECTION_ALL)) { mLeftCallback.removeCallbacks(); mRightCallback.removeCallbacks(); } break; } </code></pre> <p>from the method <code>onInterceptTouchEvent</code> to the method <code>onTouchEvent</code>.</p>
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    1. POWhy does DrawerLayout sometimes glitch upon opening?
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    1. POWhy does DrawerLayout sometimes glitch upon opening?
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    1. COGreat research, props for taking it to the next level. Just a follow up, so the `DelayedRunnable` when executed changes the state to `SETTLING` then `DRAGGING`? Or just to `DRAGGING`, but then it glitches because the state was being changed from `DRAGGING` to `DRAGGING` once again?
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    2. COAs I understand, state `DRAGGING` - `drawer` follows finger, state `SETTLING` - `drawer` moves with the constant speed, e.g. when we release it in the middle, it continues to move to close or open). `DelayedRunnable` changes state to `SETTLING` (because it is just animation, `drawer` don't follows finger).
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