Program: 23162
Project: 23162
Buggy source:
@Override public boolean onTouchEvent(MotionEvent ev){
  if (!isEnabled()) {
    return isClickable() || isLongClickable();
  }
  if (mFastScroller != null) {
    boolean intercepted=mFastScroller.onTouchEvent(ev);
    if (intercepted) {
      return true;
    }
  }
  final int action=ev.getAction();
  final int x=(int)ev.getX();
  final int y=(int)ev.getY();
  View v;
  int deltaY;
  if (mVelocityTracker == null) {
    mVelocityTracker=VelocityTracker.obtain();
  }
  mVelocityTracker.addMovement(ev);
switch (action) {
case MotionEvent.ACTION_DOWN:
{
switch (mTouchMode) {
case TOUCH_MODE_OVERFLING:
{
          mFlingRunnable.endFling();
          mTouchMode=TOUCH_MODE_OVERSCROLL;
          mLastY=y;
          mMotionCorrection=0;
          break;
        }
default :
{
        int motionPosition=pointToPosition(x,y);
        if (!mDataChanged) {
          if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0) && (getAdapter().isEnabled(motionPosition))) {
            mTouchMode=TOUCH_MODE_DOWN;
            if (mPendingCheckForTap == null) {
              mPendingCheckForTap=new CheckForTap();
            }
            postDelayed(mPendingCheckForTap,ViewConfiguration.getTapTimeout());
          }
 else {
            if (ev.getEdgeFlags() != 0 && motionPosition < 0) {
              return false;
            }
            createScrollingCache();
            mTouchMode=TOUCH_MODE_SCROLL;
            mMotionCorrection=0;
            motionPosition=findMotionRow(y);
            reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
          }
        }
        if (motionPosition >= 0) {
          v=getChildAt(motionPosition - mFirstPosition);
          mMotionViewOriginalTop=v.getTop();
          mMotionX=x;
          mMotionY=y;
          mMotionPosition=motionPosition;
        }
        mLastY=Integer.MIN_VALUE;
        break;
      }
  }
  break;
}
case MotionEvent.ACTION_MOVE:
{
deltaY=y - mMotionY;
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
  startScrollIfNeeded(deltaY);
break;
case TOUCH_MODE_SCROLL:
if (PROFILE_SCROLLING) {
if (!mScrollProfilingStarted) {
  Debug.startMethodTracing("String_Node_Str");
  mScrollProfilingStarted=true;
}
}
if (y != mLastY) {
deltaY-=mMotionCorrection;
int incrementalDeltaY=mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
int motionViewPrevTop=0;
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionViewPrevTop=motionView.getTop();
}
if (incrementalDeltaY != 0) {
trackMotionScroll(deltaY,incrementalDeltaY);
}
motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
final int motionViewRealTop=motionView.getTop();
final int motionViewNewTop=mMotionViewNewTop;
if (motionViewRealTop != motionViewNewTop) {
  mScrollY-=incrementalDeltaY - (motionViewRealTop - motionViewPrevTop);
  mTouchMode=TOUCH_MODE_OVERSCROLL;
  invalidate();
}
}
mLastY=y;
}
break;
case TOUCH_MODE_OVERSCROLL:
if (y != mLastY) {
deltaY-=mMotionCorrection;
int incrementalDeltaY=mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
final int oldScroll=mScrollY;
final int newScroll=oldScroll - incrementalDeltaY;
if ((oldScroll >= 0 && newScroll <= 0) || (oldScroll <= 0 && newScroll >= 0)) {
incrementalDeltaY=-newScroll;
mScrollY=0;
if (incrementalDeltaY != 0) {
trackMotionScroll(incrementalDeltaY,incrementalDeltaY);
}
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
int topOffset=motionView.getTop() - mMotionViewNewTop;
mTouchMode=TOUCH_MODE_SCROLL;
final int motionPosition=findMotionRow(y);
mMotionCorrection=0;
motionView=getChildAt(motionPosition - mFirstPosition);
mMotionViewOriginalTop=motionView.getTop();
mMotionY=y;
mMotionPosition=motionPosition;
}
}
 else {
mScrollY-=incrementalDeltaY;
invalidate();
}
mLastY=y;
}
break;
}
break;
}
case MotionEvent.ACTION_UP:
{
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
final int motionPosition=mMotionPosition;
final View child=getChildAt(motionPosition - mFirstPosition);
if (child != null && !child.hasFocusable()) {
if (mTouchMode != TOUCH_MODE_DOWN) {
child.setPressed(false);
}
if (mPerformClick == null) {
mPerformClick=new PerformClick();
}
final AbsListView.PerformClick performClick=mPerformClick;
performClick.mChild=child;
performClick.mClickMotionPosition=motionPosition;
performClick.rememberWindowAttachCount();
mResurrectToPosition=motionPosition;
if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) {
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ? mPendingCheckForTap : mPendingCheckForLongPress);
}
mLayoutMode=LAYOUT_NORMAL;
mTouchMode=TOUCH_MODE_TAP;
if (!mDataChanged) {
setSelectedPositionInt(mMotionPosition);
layoutChildren();
child.setPressed(true);
positionSelector(child);
setPressed(true);
if (mSelector != null) {
Drawable d=mSelector.getCurrent();
if (d != null && d instanceof TransitionDrawable) {
((TransitionDrawable)d).resetTransition();
}
}
postDelayed(new Runnable(){
public void run(){
child.setPressed(false);
setPressed(false);
if (!mDataChanged) {
post(performClick);
}
mTouchMode=TOUCH_MODE_REST;
}
}
,ViewConfiguration.getPressedStateDuration());
}
return true;
}
 else {
if (!mDataChanged) {
post(performClick);
}
}
}
mTouchMode=TOUCH_MODE_REST;
break;
case TOUCH_MODE_SCROLL:
final int childCount=getChildCount();
if (childCount > 0) {
if (mFirstPosition == 0 && getChildAt(0).getTop() >= mListPadding.top && mFirstPosition + childCount < mItemCount && getChildAt(childCount - 1).getBottom() <= getHeight() - mListPadding.bottom) {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
 else {
final VelocityTracker velocityTracker=mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000,mMaximumVelocity);
final int initialVelocity=(int)velocityTracker.getYVelocity();
if (Math.abs(initialVelocity) > mMinimumVelocity) {
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
mFlingRunnable.start(-initialVelocity);
}
 else {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
}
}
 else {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
break;
case TOUCH_MODE_OVERSCROLL:
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
final VelocityTracker velocityTracker=mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000,mMaximumVelocity);
final int initialVelocity=(int)velocityTracker.getYVelocity();
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
if (Math.abs(initialVelocity) > mMinimumVelocity) {
mFlingRunnable.startOverfling(-initialVelocity);
}
 else {
mFlingRunnable.startSpringback();
}
break;
}
setPressed(false);
invalidate();
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker=null;
}
if (PROFILE_SCROLLING) {
if (mScrollProfilingStarted) {
Debug.stopMethodTracing();
mScrollProfilingStarted=false;
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
{
switch (mTouchMode) {
case TOUCH_MODE_OVERSCROLL:
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
mFlingRunnable.startSpringback();
break;
case TOUCH_MODE_OVERFLING:
break;
default :
mTouchMode=TOUCH_MODE_REST;
setPressed(false);
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionView.setPressed(false);
}
clearScrollingCache();
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker=null;
}
}
}
}
return true;
}

Fixed version (ground truth):
@Override public boolean onTouchEvent(MotionEvent ev){
  if (!isEnabled()) {
    return isClickable() || isLongClickable();
  }
  if (mFastScroller != null) {
    boolean intercepted=mFastScroller.onTouchEvent(ev);
    if (intercepted) {
      return true;
    }
  }
  final int action=ev.getAction();
  final int x=(int)ev.getX();
  final int y=(int)ev.getY();
  View v;
  int deltaY;
  if (mVelocityTracker == null) {
    mVelocityTracker=VelocityTracker.obtain();
  }
  mVelocityTracker.addMovement(ev);
switch (action) {
case MotionEvent.ACTION_DOWN:
{
switch (mTouchMode) {
case TOUCH_MODE_OVERFLING:
{
          mFlingRunnable.endFling();
          mTouchMode=TOUCH_MODE_OVERSCROLL;
          mLastY=y;
          mMotionCorrection=0;
          break;
        }
default :
{
        int motionPosition=pointToPosition(x,y);
        if (!mDataChanged) {
          if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0) && (getAdapter().isEnabled(motionPosition))) {
            mTouchMode=TOUCH_MODE_DOWN;
            if (mPendingCheckForTap == null) {
              mPendingCheckForTap=new CheckForTap();
            }
            postDelayed(mPendingCheckForTap,ViewConfiguration.getTapTimeout());
          }
 else {
            if (ev.getEdgeFlags() != 0 && motionPosition < 0) {
              return false;
            }
            createScrollingCache();
            mTouchMode=TOUCH_MODE_SCROLL;
            mMotionCorrection=0;
            motionPosition=findMotionRow(y);
            reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
          }
        }
        if (motionPosition >= 0) {
          v=getChildAt(motionPosition - mFirstPosition);
          mMotionViewOriginalTop=v.getTop();
          mMotionX=x;
          mMotionY=y;
          mMotionPosition=motionPosition;
        }
        mLastY=Integer.MIN_VALUE;
        break;
      }
  }
  break;
}
case MotionEvent.ACTION_MOVE:
{
deltaY=y - mMotionY;
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
  startScrollIfNeeded(deltaY);
break;
case TOUCH_MODE_SCROLL:
if (PROFILE_SCROLLING) {
if (!mScrollProfilingStarted) {
  Debug.startMethodTracing("String_Node_Str");
  mScrollProfilingStarted=true;
}
}
if (y != mLastY) {
deltaY-=mMotionCorrection;
int incrementalDeltaY=mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
int motionViewPrevTop=0;
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionViewPrevTop=motionView.getTop();
}
if (incrementalDeltaY != 0) {
trackMotionScroll(deltaY,incrementalDeltaY);
}
motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
final int motionViewRealTop=motionView.getTop();
final int motionViewNewTop=mMotionViewNewTop;
if (motionViewRealTop != motionViewNewTop) {
  mScrollY-=incrementalDeltaY - (motionViewRealTop - motionViewPrevTop);
  mTouchMode=TOUCH_MODE_OVERSCROLL;
  invalidate();
}
}
mLastY=y;
}
break;
case TOUCH_MODE_OVERSCROLL:
if (y != mLastY) {
deltaY-=mMotionCorrection;
int incrementalDeltaY=mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
final int oldScroll=mScrollY;
final int newScroll=oldScroll - incrementalDeltaY;
if ((oldScroll >= 0 && newScroll <= 0) || (oldScroll <= 0 && newScroll >= 0)) {
incrementalDeltaY=-newScroll;
mScrollY=0;
if (incrementalDeltaY != 0) {
trackMotionScroll(incrementalDeltaY,incrementalDeltaY);
}
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
mTouchMode=TOUCH_MODE_SCROLL;
final int motionPosition=findMotionRow(y);
mMotionCorrection=0;
motionView=getChildAt(motionPosition - mFirstPosition);
mMotionViewOriginalTop=motionView.getTop();
mMotionY=y;
mMotionPosition=motionPosition;
}
}
 else {
mScrollY-=incrementalDeltaY;
invalidate();
}
mLastY=y;
}
break;
}
break;
}
case MotionEvent.ACTION_UP:
{
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
final int motionPosition=mMotionPosition;
final View child=getChildAt(motionPosition - mFirstPosition);
if (child != null && !child.hasFocusable()) {
if (mTouchMode != TOUCH_MODE_DOWN) {
child.setPressed(false);
}
if (mPerformClick == null) {
mPerformClick=new PerformClick();
}
final AbsListView.PerformClick performClick=mPerformClick;
performClick.mChild=child;
performClick.mClickMotionPosition=motionPosition;
performClick.rememberWindowAttachCount();
mResurrectToPosition=motionPosition;
if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) {
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ? mPendingCheckForTap : mPendingCheckForLongPress);
}
mLayoutMode=LAYOUT_NORMAL;
mTouchMode=TOUCH_MODE_TAP;
if (!mDataChanged) {
setSelectedPositionInt(mMotionPosition);
layoutChildren();
child.setPressed(true);
positionSelector(child);
setPressed(true);
if (mSelector != null) {
Drawable d=mSelector.getCurrent();
if (d != null && d instanceof TransitionDrawable) {
((TransitionDrawable)d).resetTransition();
}
}
postDelayed(new Runnable(){
public void run(){
child.setPressed(false);
setPressed(false);
if (!mDataChanged) {
post(performClick);
}
mTouchMode=TOUCH_MODE_REST;
}
}
,ViewConfiguration.getPressedStateDuration());
}
return true;
}
 else {
if (!mDataChanged) {
post(performClick);
}
}
}
mTouchMode=TOUCH_MODE_REST;
break;
case TOUCH_MODE_SCROLL:
final int childCount=getChildCount();
if (childCount > 0) {
if (mFirstPosition == 0 && getChildAt(0).getTop() >= mListPadding.top && mFirstPosition + childCount < mItemCount && getChildAt(childCount - 1).getBottom() <= getHeight() - mListPadding.bottom) {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
 else {
final VelocityTracker velocityTracker=mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000,mMaximumVelocity);
final int initialVelocity=(int)velocityTracker.getYVelocity();
if (Math.abs(initialVelocity) > mMinimumVelocity) {
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
mFlingRunnable.start(-initialVelocity);
}
 else {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
}
}
 else {
mTouchMode=TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
break;
case TOUCH_MODE_OVERSCROLL:
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
final VelocityTracker velocityTracker=mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000,mMaximumVelocity);
final int initialVelocity=(int)velocityTracker.getYVelocity();
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
if (Math.abs(initialVelocity) > mMinimumVelocity) {
mFlingRunnable.startOverfling(-initialVelocity);
}
 else {
mFlingRunnable.startSpringback();
}
break;
}
setPressed(false);
invalidate();
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker=null;
}
if (PROFILE_SCROLLING) {
if (mScrollProfilingStarted) {
Debug.stopMethodTracing();
mScrollProfilingStarted=false;
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
{
switch (mTouchMode) {
case TOUCH_MODE_OVERSCROLL:
if (mFlingRunnable == null) {
mFlingRunnable=new FlingRunnable();
}
mFlingRunnable.startSpringback();
break;
case TOUCH_MODE_OVERFLING:
break;
default :
mTouchMode=TOUCH_MODE_REST;
setPressed(false);
View motionView=this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionView.setPressed(false);
}
clearScrollingCache();
final Handler handler=getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker=null;
}
}
}
}
return true;
}