我在触摸列表中使用cwac touchlist样本进行拖放。
我在对话框中有触摸列表。它工作正常。
直到说如果我尝试拖动对话框视图之外的列表项之一可能是上限（mLowerBound）或lowerlimt（mUpperBound），屏幕开始闪烁，所有突然的对话视图都转换为黑白线。出来需要回压。
它不会抛出任何异常，但对话框会消失，我们无法做任何事情。
添加一些我已经采取的调用堆栈
可能是什么问题和解决方案。请指导我。
mDragPos:4
mHeight:689
touchSlop:24
mUpperBound:136mLowerBound:459
speed:0
y NEW:160
mLowerBound NEW:459
speed:0
y NEW:183
mLowerBound NEW:459
speed:0
y NEW:202
mLowerBound NEW:459
speed:0
y NEW:207
mLowerBound NEW:459
speed:0
y NEW:210
mLowerBound NEW:459
speed:0
y NEW:236
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:278
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:296
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:317
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:336
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:352
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:372
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:379
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:409
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:426
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:451
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:456
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:488
mUpperBound NEW:229
mLowerBound:speed:4
ref:7
speed:0
y NEW:510
mUpperBound NEW:229
mLowerBound:speed:4
ref:7
speed:0
y NEW:532
mUpperBound NEW:229
mLowerBound:speed:4
ref:7
speed:0
y NEW:576
mUpperBound NEW:229
mLowerBound:speed:16
ref:7
speed:0
y NEW:640
mUpperBound NEW:229
mLowerBound:speed:16
ref:7
speed:0
y NEW:372
mUpperBound NEW:229
mLowerBound NEW:459
speed:0
y NEW:383
mUpperBound NEW:229
mLowerBound NEW:459
03-10 10:37:52.280: I/InputReader(2698): dispatchTouch::touch event's action is 1
03-10 10:37:52.280: I/InputDispatcher(2698): Delivering touch to current input target: action: 1, channel '40bd5fe0 com.sample.dndlistview/com.sample.dndlistview.DnDListViewActivity (server)'