Android的检测继续上下滚动

Question

我开发自定义列表应用程序。我是凌驾触摸事件的名单。 列表滚动很好，如果我滚动一次（触摸和或移动手指上下一次）。当我上下滚动列表而不离开列表时（即触摸向上移动然后离开），在这种情况下列表不能正确滚动。由于action_move只需要第一次滚动，即当我将列表向下移动时，action_move未被检测到。 如果有人试图这样做，请让我知道。 任何代码片段都会有很大的帮助。

谢谢

Answer 1

我做了这样的事情。你也可以试试。它的工作不错

public boolean onTouchEvent(MotionEvent ev) { 
    final int action = ev.getAction(); 
    if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) { 
     Log.d("DB", " scrolling twice "); 
     scrolltwice = true; 
     return true; 
    } 

    final float x = ev.getX(); 
    final float y = ev.getY(); 
    switch(action & MotionEvent.ACTION_MASK){ 

    case MotionEvent.ACTION_MOVE: 

     final int xDiff = (int) Math.abs(x - mLastMotionX); 
     yDiff = (int) (y - mLastMotionY); 
     final int ydif = (int) Math.abs(y - mLastMotionY); 

     final int touchSlop = mTouchSlop; 
     boolean xMoved = xDiff > touchSlop; 
     boolean yMoved = ydif > touchSlop; 
     if (xMoved || yMoved) { 
      if (yMoved) {     
       mTouchState = TOUCH_STATE_SCROLLING; 
      } 
     } 
     break; 

    case MotionEvent.ACTION_DOWN: 

     if (!mScroller.isFinished()) { 
      mScroller.abortAnimation(); 
     } 
     // Remember location of down touch 
     mLastMotionX = x; 
     mLastMotionY = y;   
     break; 
    case MotionEvent.ACTION_CANCEL: 
    case MotionEvent.ACTION_UP: 

     final int myDiff = (int) (y - mLastMotionY); 

     if(mTouchState == TOUCH_STATE_SCROLLING){ 
      scrolltwice = false; 
      if(!scrolltwice){ 
      Log.d("DB", " ACTION_UP fetch new records "); 
       FetchRecords rec = new FetchRecords(); 
       rec.execute(); 
       if(yDiff < 0){ // fetching next slot of records 
        nextRecordId = nextRecordId + previousTotal; 
        if(nextRecordId > totalRowCount){ 
         nextRecordId = nextRecordId - previousTotal; 
        } 
       }else if(yDiff > 0){ // fetching previous slot of records 
        nextRecordId = nextRecordId - previousTotal; 
        if(nextRecordId < 1){ 
         nextRecordId = 0; 
        } 
       } 
      } 
     } 
     scrolltwice = false; 
     mTouchState = TOUCH_STATE_REST; 
     break; 
    } 
    return false; 

} 

     //implement ontouch listener if the view is list pass it onTouchEvent 
public boolean onTouch(View v, MotionEvent event) { 
    if(v.equals(objListView)) 
     onTouchEvent(event); 
    return false; 
}