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Commit 1f913ea0 authored by ryanlwlin's avatar ryanlwlin
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Fix Hard to detect multi-finger multi-tap 

The double-tap/touch slope is from system's double-tap detector.
This threshold is too narrow for multi-finger multi-tap. It ends up
canceling the detection when the movement exceed the slope.

We adjust the slopes by multiplying the target finger count.
The maxium slope in 4 fingers is around 4.48 mm is smaller than
the swipe threshold (1 cm)
Bug: 158725482
Test: atest GestureManifoldTest
atest TouchExplorerTest
atest AccessibilityGestureDetectorTest

Change-Id: If0927d15d61a9682da67721d0bf0bbbc1045078b
parent 71444592

services/accessibility/java/com/android/server/accessibility/gestures/MultiFingerMultiTap.java

+2 −2
Original line number Diff line number Diff line
@@ -67,8 +67,8 @@ class MultiFingerMultiTap extends GestureMatcher { 
        Preconditions.checkArgumentPositive(taps, "Tap count must greater than 0.");

        mTargetTapCount = taps;

        mTargetFingerCount = fingers;

        mDoubleTapSlop = ViewConfiguration.get(context).getScaledDoubleTapSlop();

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

        mDoubleTapSlop = ViewConfiguration.get(context).getScaledDoubleTapSlop() * fingers;

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop() * fingers;



        mBases = new PointF[mTargetFingerCount];

        for (int i = 0; i < mBases.length; i++) {