Smooth scrolling with inertia and edge resistance/snapback?

Use a OnGestureListener To provide smooth scroll, create a scroller (in your custom view). When the gesture listener detects a fling event, set the scroller up. Then, override your custom view's computeScroll() method Check this example to know how to implement it int lastX; int lastY; Scroller scroller; @Override public void computeScroll() { if (scroller.

ComputeScrollOffset()) { if (!scrolledLastFrame) { lastX = scroller.getStartX(); lastY = scroller.getStartY(); } int dx = scroller.getCurrX() - lastX; int dy = scroller.getCurrY() - lastY; lastX = scroller.getCurrX(); lastY = scroller.getCurrY(); doScroll(dx, dy); scrolledLastFrame = true; } else { scrolledLastFrame = false; } } public void doFling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY) { scroller. Fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY); invalidate(); } public void doScroll(int dx, int dy) { currentX+=dx; currentY+=dy; invalidate(); } private class ProgramGestureListener extends SimpleOnGestureListener { @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { doScroll(distanceX, distanceY); return true; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { int max_left = getMaxHorizontalScroll(); int max_top = getMaxVerticalScroll(); int min_left = getMinHorizontalScroll(); int min_top = getMinVerticalScroll(); int startX = getCurrentHorizontalScroll(); int startY = getCurrentVerticalScroll(); doFling(startX, startY, (int) -velocityX, (int) -velocityY, min_left, max_left, min_top, max_top); return true; } }.

Use a OnGestureListener. To provide smooth scroll, create a scroller (in your custom view). When the gesture listener detects a fling event, set the scroller up.

Then, override your custom view's computeScroll() method. Check this example to know how to implement it. Int lastX; int lastY; Scroller scroller; @Override public void computeScroll() { if (scroller.

ComputeScrollOffset()) { if (!scrolledLastFrame) { lastX = scroller.getStartX(); lastY = scroller.getStartY(); } int dx = scroller.getCurrX() - lastX; int dy = scroller.getCurrY() - lastY; lastX = scroller.getCurrX(); lastY = scroller.getCurrY(); doScroll(dx, dy); scrolledLastFrame = true; } else { scrolledLastFrame = false; } } public void doFling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY) { scroller. Fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY); invalidate(); } public void doScroll(int dx, int dy) { currentX+=dx; currentY+=dy; invalidate(); } private class ProgramGestureListener extends SimpleOnGestureListener { @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { doScroll(distanceX, distanceY); return true; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { int max_left = getMaxHorizontalScroll(); int max_top = getMaxVerticalScroll(); int min_left = getMinHorizontalScroll(); int min_top = getMinVerticalScroll(); int startX = getCurrentHorizontalScroll(); int startY = getCurrentVerticalScroll(); doFling(startX, startY, (int) -velocityX, (int) -velocityY, min_left, max_left, min_top, max_top); return true; } }.

I didn't know about computeScroll(), it's way better than use computeScrollOffset() inside onDraw() like I did. +1 – bigstones Feb 15 at 13:10 Thanks! I've tried to implement a solution based on your answer, but my computeScroll() is not called for some reason.Do I have to connect Scroller and View somehow?

– Fabian Feb 18 at 13:21 to use a GestureListener, you also need to use a GestureDetector. Send touch events to the detector and set the ProgramGestureListener as the detector's listener. Maybe useful: stackoverflow.

Com/questions/937313/… – Pedro Loureiro Feb 18 at 15:30.

Use the Scroller class, I posted an example of use here. If you're on API 9 you could use OverScroller I think.

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