我使用了拖动和放大器从本教程中删除列表视图：http://www.youtube.com/watch?v=_BZIvjMgH-Q。 有了这个，我们可以在长时间点击后拖动列表中的项目，但它太长了。
代码：
/**
* Listens for long clicks on any items in the listview. When a cell has
* been selected, the hover cell is created and set up.
*/
private AdapterView.OnItemLongClickListener mOnItemLongClickListener = new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int pos, long id) {
//code
}
};
我尝试设置“onItemClickListener”，但在我需要单击一次以聚焦项目并单击两次以拖动它之后。
如何更换此代码以缩短长按效果？ 谢谢你的帮助
答案 0 :(得分：1)
好的，所以我对DynamicListView.java进行了三次重大更改
1）我将setter更改为
下面的setOnItemClickListener public void init(Context context) {
setOnItemClickListener(mOnItemClickListener);
//setOnScrollListener(mScrollListener);
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
mSmoothScrollAmountAtEdge = (int) (SMOOTH_SCROLL_AMOUNT_AT_EDGE / metrics.density);
}
2）我使用了onItemClickListener而不是使用catch块异常的onItemLongClickListener
public AdapterView.OnItemClickListener mOnItemClickListener = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int pos,
long id){
try {
mTotalOffset = 0;
//Toast.makeText(getContext(), "OnItemClickListener", 100).show();
int position = pointToPosition(mDownX, mDownY);
int itemNum = position - getFirstVisiblePosition();
View selectedView = getChildAt(itemNum);
mMobileItemId = getAdapter().getItemId(position);
mHoverCell = getAndAddHoverView(selectedView);
selectedView.setVisibility(INVISIBLE);
mCellIsMobile = true;
updateNeighborViewsForID(mMobileItemId);
} catch (Exception e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
}
};
3）我更改了下面的代码，这样当你按下它时，它会在同一时刻调用key up事件，从而调用onItemClickListener
唯一让我烦恼的是，如果你快速触摸它，那么hoverview会一直停留在那里，但当你再次按下它时就会消失。
@覆盖
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
//Toast.makeText(getContext(),"previously touched = true",Toast.LENGTH_SHORT).show();
if (passThroughActionUp){touchEventsEnded();passThroughActionUp = false; }
passThroughActionDown = true;
mDownX = (int) event.getX();
mDownY = (int) event.getY();
mActivePointerId = event.getPointerId(0);
event.setAction(MotionEvent.ACTION_UP);
break;
case MotionEvent.ACTION_MOVE:
if (mActivePointerId == INVALID_POINTER_ID) {
break;
}
//Toast.makeText(getContext()," passthroughActionMove = true",Toast.LENGTH_SHORT).show();
int pointerIndex = event.findPointerIndex(mActivePointerId);
mLastEventY = (int) event.getY(pointerIndex);
int deltaY = mLastEventY - mDownY;
//mCellIsMobile being true means that you are in a dragging event.
if (mCellIsMobile) {
mHoverCellCurrentBounds.offsetTo(mHoverCellOriginalBounds.left,
mHoverCellOriginalBounds.top + deltaY + mTotalOffset);
mHoverCell.setBounds(mHoverCellCurrentBounds);
invalidate();
handleCellSwitch();
mIsMobileScrolling = false;
handleMobileCellScroll();
return false;
}
break;
case MotionEvent.ACTION_UP:
//if (passThroughActionDown){touchEventsEnded();passThroughActionDown = false; break;}
passThroughActionUp = true;
touchEventsEnded();
break;
case MotionEvent.ACTION_CANCEL:
touchEventsCancelled();
break;
case MotionEvent.ACTION_POINTER_UP:
/*
* If a multitouch event took place and the original touch dictating
* the movement of the hover cell has ended, then the dragging event
* ends and the hover cell is animated to its corresponding position
* in the listview.
*/
pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = event.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
touchEventsEnded();
}
break;
default:
break;
}
return super.onTouchEvent(event);
}
答案 1 :(得分：-1)
我找到了解决方案。我在列表中使用了一个自定义适配器来监听每个项目，并且我已经使用模式观察器在LongCustomItemClick上创建了一个监听器。
适配器的getView代码：
@Override
public View getView(int pPosition, View pConvertView, ViewGroup pParent) {
ViewHolder holder = null;
final int posCopy = pPosition;
if (pConvertView == null) {
LayoutInflater inflater = listViewDraggingAnimation.getLayoutInflater();
pConvertView = inflater.inflate(R.layout.text_view, null);
holder = new ViewHolder();
holder.tvTitle = (TextView) pConvertView.findViewById(R.id.title);
pConvertView.setOnTouchListener(new OnTouchListener() {
boolean mHasPerformedLongPress;
Runnable mPendingCheckForLongPress;
@Override
public boolean onTouch(final View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
if (!mHasPerformedLongPress) {
// This is a tap, so remove the longpress check
if (mPendingCheckForLongPress != null) {
v.removeCallbacks(mPendingCheckForLongPress);
}
// v.performClick();
}
break;
case MotionEvent.ACTION_DOWN:
if (mPendingCheckForLongPress == null) {
mPendingCheckForLongPress = new Runnable() {
public void run() {
updateOnItemCustomLongClickListener();
}
};
}
mHasPerformedLongPress = false;
v.postDelayed(mPendingCheckForLongPress, timeForLongClick);
break;
case MotionEvent.ACTION_MOVE:
final int x = (int) event.getX();
final int y = (int) event.getY();
// Be lenient about moving outside of buttons
int slop = ViewConfiguration.get(v.getContext()).getScaledTouchSlop();
if ((x < 0 - slop) || (x >= v.getWidth() + slop) || (y < 0 - slop)
|| (y >= v.getHeight() + slop)) {
if (mPendingCheckForLongPress != null) {
v.removeCallbacks(mPendingCheckForLongPress);
}
}
break;
default:
return false;
}
return false;
}
});
pConvertView.setTag(holder);
pConvertView.setTag(R.id.title, holder.tvTitle);
} else {
holder = (ViewHolder) pConvertView.getTag();
}
holder.tvTitle.setText(optionList.get(pPosition).getTitle());
return pConvertView;
这里updateOnItemCustomLongClickListener（）;对应于执行覆盖方法onCustomLongClick（由我的模式观察者的接口生成）的观察者的更新，该替换方法替换了主题顶部的AdapterView.OnItemLongClickListener。 timeForLongClick是长按时间。