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Bouncable HorizontalScrollView
public class HorizontalOverScrollView extends HorizontalScrollView {
private static final int WIDTH_DEVIDER_OVERSCROLL_DISTANCE = 3;
private TimeInterpolator mInterpolator;
private int mMaxOverscrollDistance;
private int mAnimTime;
private long mStartTime;
/**
* Instantiates {@link HorizontalOverScrollView} object.
*/
public HorizontalOverScrollView(final Context context) {
super(context);
init();
}
/**
* Instantiates {@link HorizontalOverScrollView} object.
*/
public HorizontalOverScrollView(final Context context, final AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* Instantiates {@link HorizontalOverScrollView} object.
*/
public HorizontalOverScrollView(final Context context, final AttributeSet attrs, final int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
final int widthPixels = getContext().getResources().getDisplayMetrics().widthPixels;
mMaxOverscrollDistance = widthPixels / WIDTH_DEVIDER_OVERSCROLL_DISTANCE;
mAnimTime = getContext().getResources().getInteger(android.R.integer.config_mediumAnimTime);
mInterpolator = new DecelerateInterpolator();
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
int overScrollDistance = mMaxOverscrollDistance;
if (isTouchEvent) {
mStartTime = AnimationUtils.currentAnimationTimeMillis();
} else {
final long elapsedTime = AnimationUtils.currentAnimationTimeMillis() - mStartTime;
float interpolation = mInterpolator.getInterpolation((float) elapsedTime / mAnimTime);
interpolation = interpolation > 1 ? 1 : interpolation;
overScrollDistance -= overScrollDistance * interpolation;
overScrollDistance = overScrollDistance < 0 ? 0 : overScrollDistance;
}
return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, overScrollDistance, maxOverScrollY, isTouchEvent);
}
}
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