Improve quickzooming on Android

[brewin]

Fixes #3131 and #3132

[tobrun]

@brewin just tried this out and this fixes #3131, awesome stuff!
As for #3132, I'm not seeing how this is being resolved.
Is this resolved without introducing that construction you mentioned in the issue itself?

[brewin]

I found that the fix I described was basically already implemented in ScaleGestureListener. The problem was that with mQuickZoom set to true in double-tap ACTION_MOVE, double-tap zooming would never occur even when "sloppy" taps were detected in ScaleGestureListener. Setting mQuickZoom to true in ScaleGestureListener fixes that. So now double-taps with very slight movement of the finger before ACTION_UP actually zoom in on the map instead of just being ignored. This behavior seems to be similar to how Google Maps works.

Code in ScaleGestureListener:

            // If scale is large enough ignore a tap
            mScaleFactor *= detector.getScaleFactor();
            if ((mScaleFactor > 1.05f) || (mScaleFactor < 0.95f)) {
                mZoomStarted = true;
            }

            // Ignore short touches in case it is a tap
            // Also ignore small scales
            long time = detector.getEventTime();
            long interval = time - mBeginTime;
            if (!mZoomStarted && (interval <= ViewConfiguration.getTapTimeout())) {
                return false;
            }

            if (!mZoomStarted) {
                return false;
            }

            // Cancel any animation
            mNativeMapView.cancelTransitions();

            // Gesture is a quickzoom if there aren't two fingers
            mQuickZoom = !mTwoTap;

[tobrun]

Merged with 60b0e78

@brewin Awesome work! thank you for contributing