Program: 2622
Project: 2622
Buggy source:
private int deliverTrackballEventPostIme(QueuedInputEvent q){
  final MotionEvent event=(MotionEvent)q.mEvent;
  if (mView == null || !mAdded) {
    return EVENT_NOT_HANDLED;
  }
  if (mView.dispatchTrackballEvent(event)) {
    ensureTouchMode(false);
    mLastTrackballTime=Integer.MIN_VALUE;
    return EVENT_HANDLED;
  }
  final TrackballAxis x=mTrackballAxisX;
  final TrackballAxis y=mTrackballAxisY;
  long curTime=SystemClock.uptimeMillis();
  if ((mLastTrackballTime + MAX_TRACKBALL_DELAY) < curTime) {
    x.reset(0);
    y.reset(0);
    mLastTrackballTime=curTime;
  }
  final int action=event.getAction();
  final int metaState=event.getMetaState();
switch (action) {
case MotionEvent.ACTION_DOWN:
    x.reset(2);
  y.reset(2);
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_CENTER,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
break;
case MotionEvent.ACTION_UP:
x.reset(2);
y.reset(2);
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_UP,KeyEvent.KEYCODE_DPAD_CENTER,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
break;
}
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + x.position + "String_Node_Str"+ x.step+ "String_Node_Str"+ x.dir+ "String_Node_Str"+ x.acceleration+ "String_Node_Str"+ event.getX()+ "String_Node_Str"+ y.position+ "String_Node_Str"+ y.step+ "String_Node_Str"+ y.dir+ "String_Node_Str"+ y.acceleration+ "String_Node_Str"+ event.getY());
final float xOff=x.collect(event.getX(),event.getEventTime(),"String_Node_Str");
final float yOff=y.collect(event.getY(),event.getEventTime(),"String_Node_Str");
int keycode=0;
int movement=0;
float accel=1;
if (xOff > yOff) {
movement=x.generate((2 / event.getXPrecision()));
if (movement != 0) {
keycode=movement > 0 ? KeyEvent.KEYCODE_DPAD_RIGHT : KeyEvent.KEYCODE_DPAD_LEFT;
accel=x.acceleration;
y.reset(2);
}
}
 else if (yOff > 0) {
movement=y.generate((2 / event.getYPrecision()));
if (movement != 0) {
keycode=movement > 0 ? KeyEvent.KEYCODE_DPAD_DOWN : KeyEvent.KEYCODE_DPAD_UP;
accel=y.acceleration;
x.reset(2);
}
}
if (keycode != 0) {
if (movement < 0) movement=-movement;
int accelMovement=(int)(movement * accel);
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + movement + "String_Node_Str"+ accelMovement+ "String_Node_Str"+ accel);
if (accelMovement > movement) {
if (DEBUG_TRACKBALL) Log.v("String_Node_Str","String_Node_Str" + keycode);
movement--;
int repeatCount=accelMovement - movement;
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_MULTIPLE,keycode,repeatCount,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
}
while (movement > 0) {
if (DEBUG_TRACKBALL) Log.v("String_Node_Str","String_Node_Str" + keycode);
movement--;
curTime=SystemClock.uptimeMillis();
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_DOWN,keycode,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_UP,keycode,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
}
mLastTrackballTime=curTime;
}
return EVENT_HANDLED;
}

Fixed version (ground truth):
private int deliverTrackballEventPostIme(QueuedInputEvent q){
  final MotionEvent event=(MotionEvent)q.mEvent;
  if (mView == null || !mAdded) {
    return EVENT_NOT_HANDLED;
  }
  if (mView.dispatchTrackballEvent(event)) {
    ensureTouchMode(false);
    mLastTrackballTime=Integer.MIN_VALUE;
    return EVENT_HANDLED;
  }
  final TrackballAxis x=mTrackballAxisX;
  final TrackballAxis y=mTrackballAxisY;
  long curTime=SystemClock.uptimeMillis();
  if ((mLastTrackballTime + MAX_TRACKBALL_DELAY) < curTime) {
    x.reset(0);
    y.reset(0);
    mLastTrackballTime=curTime;
  }
  final int action=event.getAction();
  final int metaState=event.getMetaState();
switch (action) {
case MotionEvent.ACTION_DOWN:
    x.reset(2);
  y.reset(2);
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_CENTER,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
break;
case MotionEvent.ACTION_UP:
x.reset(2);
y.reset(2);
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_UP,KeyEvent.KEYCODE_DPAD_CENTER,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
break;
}
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + x.position + "String_Node_Str"+ x.step+ "String_Node_Str"+ x.dir+ "String_Node_Str"+ x.acceleration+ "String_Node_Str"+ event.getX()+ "String_Node_Str"+ y.position+ "String_Node_Str"+ y.step+ "String_Node_Str"+ y.dir+ "String_Node_Str"+ y.acceleration+ "String_Node_Str"+ event.getY());
final float xOff=x.collect(event.getX(),event.getEventTime(),"String_Node_Str");
final float yOff=y.collect(event.getY(),event.getEventTime(),"String_Node_Str");
int keycode=0;
int movement=0;
float accel=1;
if (xOff > yOff) {
movement=x.generate((2 / event.getXPrecision()));
if (movement != 0) {
keycode=movement > 0 ? KeyEvent.KEYCODE_DPAD_RIGHT : KeyEvent.KEYCODE_DPAD_LEFT;
accel=x.acceleration;
y.reset(2);
}
}
 else if (yOff > 0) {
movement=y.generate((2 / event.getYPrecision()));
if (movement != 0) {
keycode=movement > 0 ? KeyEvent.KEYCODE_DPAD_DOWN : KeyEvent.KEYCODE_DPAD_UP;
accel=y.acceleration;
x.reset(2);
}
}
if (keycode != 0) {
if (movement < 0) movement=-movement;
int accelMovement=(int)(movement * accel);
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + movement + "String_Node_Str"+ accelMovement+ "String_Node_Str"+ accel);
if (accelMovement > movement) {
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + keycode);
movement--;
int repeatCount=accelMovement - movement;
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_MULTIPLE,keycode,repeatCount,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
}
while (movement > 0) {
if (DEBUG_TRACKBALL) Log.v(TAG,"String_Node_Str" + keycode);
movement--;
curTime=SystemClock.uptimeMillis();
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_DOWN,keycode,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
enqueueInputEvent(new KeyEvent(curTime,curTime,KeyEvent.ACTION_UP,keycode,0,metaState,KeyCharacterMap.VIRTUAL_KEYBOARD,0,KeyEvent.FLAG_FALLBACK,InputDevice.SOURCE_KEYBOARD));
}
mLastTrackballTime=curTime;
}
return EVENT_HANDLED;
}