下面列出了android.widget.AdapterView#INVALID_POSITION 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private void performAdapterViewItemClick(MotionEvent e){
ViewParent t = getParent();
while(t != null) {
if(t instanceof AdapterView){
AdapterView view = (AdapterView)t;
int p = view.getPositionForView(SwipeLayout.this);
if( p != AdapterView.INVALID_POSITION &&
view.performItemClick(view.getChildAt(p), p, view.getAdapter().getItemId(p)))
return;
}else{
if(t instanceof View && ((View) t).performClick())
return;
}
t = t.getParent();
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
boolean bool = true;
if (dragImageView != null && dragPosition != AdapterView.INVALID_POSITION) {
// 移动时候的对应x,y位置
bool = super.onTouchEvent(ev);
int x = (int) ev.getX();
int y = (int) ev.getY();
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = (int) ev.getX();
windowX = (int) ev.getX();
downY = (int) ev.getY();
windowY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
onDrag(x, y, (int) ev.getRawX(), (int) ev.getRawY());
if (!isMoving) {
OnMove(x, y);
}
if (pointToPosition(x, y) != AdapterView.INVALID_POSITION) {
break;
}
break;
case MotionEvent.ACTION_UP:
stopDrag();
onDrop(x, y);
requestDisallowInterceptTouchEvent(false);
break;
default:
break;
}
}
return super.onTouchEvent(ev);
}
/**
* 交换item,并且控制item之间的显示与隐藏效果
* @param moveX
* @param moveY
*/
private void onSwapItem(int moveX, int moveY){
//获取我们手指移动到的那个item的position
final int tempPosition = pointToPosition(moveX, moveY);
//假如tempPosition 改变了并且tempPosition不等于-1,则进行交换
if(tempPosition != mDragPosition && tempPosition != AdapterView.INVALID_POSITION && mAnimationEnd ){
mDragAdapter.setHideItem(tempPosition);
mDragAdapter.reorderItems(mDragPosition, tempPosition);
final ViewTreeObserver observer = getViewTreeObserver();
observer.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
observer.removeOnPreDrawListener(this);
animateReorder(mDragPosition, tempPosition);
mDragPosition = tempPosition; //交换结束更新mDragPosition
return true;
}
} );
}
}
private void performAdapterViewItemClick() {
if (getOpenStatus() != Status.Close) return;
ViewParent t = getParent();
if (t instanceof AdapterView) {
AdapterView view = (AdapterView) t;
int p = view.getPositionForView(SwipeLayout.this);
if (p != AdapterView.INVALID_POSITION) {
view.performItemClick(view.getChildAt(p - view.getFirstVisiblePosition()), p, view
.getAdapter().getItemId(p));
}
}
}
/**
* 获取末个HeaderItem位置
* 无HeaderItem则返回 AdapterView.INVALID_POSITION
*
* @return 末个HeaderItem位置
*/
@SuppressWarnings("unused")
public int getLastHeaderItemPosition() {
// Header
if (mHeaderItemInfo.size() > 0) {
return getHeaderViewsCount() + getHeaderItemsCount() - 1;
} else {
return AdapterView.INVALID_POSITION;
}
}
public void initCreatDragImage(int position) {
//根据按下的X,Y坐标获取所点击item的position
mDragPosition = position;
Log.d("mDagPosition is", "" + mDragPosition);
if(mDragPosition == AdapterView.INVALID_POSITION){
return ;
}
//根据position获取该item所对应的View
mStartDragItemView = getChildAt(mDragPosition - getFirstVisiblePosition());
//获取DragGridView自动向上滚动的偏移量，小于这个值，DragGridView向下滚动
mDownScrollBorder = getHeight() / 5;
//获取DragGridView自动向下滚动的偏移量，大于这个值，DragGridView向上滚动
mUpScrollBorder = getHeight() * 4/5;
//开启mDragItemView绘图缓存
mStartDragItemView.setDrawingCacheEnabled(true);
//获取mDragItemView在缓存中的Bitmap对象
mDragBitmap = Bitmap.createBitmap(mStartDragItemView.getDrawingCache());
//这一步很关键，释放绘图缓存，避免出现重复的镜像
mStartDragItemView.destroyDrawingCache();
}
/**
* 获取HeaderView的集合位置（HeaderView占用的空白位置也算作HeaderView）
* 返回 AdapterView.INVALID_POSITION 表明其对应的不是HeaderView
*
* @param position 位置
* @return HeaderView的集合位置
*/
public int positionToHeaderViewIndex(int position) {
if (getHeaderViewsCount() > 0 && position < getHeaderViewsCount()) {
return position / mNumColumns;
} else {
return AdapterView.INVALID_POSITION;
}
}
/**
* 获取FooterView的集合位置（FooterView占用的空白位置也算作FooterView）
* 返回 AdapterView.INVALID_POSITION 表明其对应的不是FooterView
*
* @param position 位置
* @return FooterView的集合位置
*/
public int positionToFooterViewIndex(int position) {
int startPosition = getHeaderViewsCount() + getHeaderItemsCount()
+ getItemCount() + getFooterItemsCount() + unusedPositionCount;
if (getFooterViewsCount() > 0 && position >= startPosition) {
return (position - startPosition) / mNumColumns;
} else {
return AdapterView.INVALID_POSITION;
}
}
public int viewIdHitPosition(MotionEvent ev, int id) {
final int x = (int) ev.getX();
final int y = (int) ev.getY();
int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
final int numHeaders = mDslv.getHeaderViewsCount();
final int numFooters = mDslv.getFooterViewsCount();
final int count = mDslv.getCount();
// Log.d("mobeta", "touch down on position " + itemnum);
// We're only interested if the touch was on an
// item that's not a header or footer.
if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
&& touchPos < (count - numFooters)) {
final View item = mDslv.getChildAt(touchPos
- mDslv.getFirstVisiblePosition());
final int rawX = (int) ev.getRawX();
final int rawY = (int) ev.getRawY();
View dragBox = id == 0 ? item : (View) item.findViewById(id);
if (dragBox != null) {
dragBox.getLocationOnScreen(mTempLoc);
if (rawX > mTempLoc[0] && rawY > mTempLoc[1]
&& rawX < mTempLoc[0] + dragBox.getWidth()
&& rawY < mTempLoc[1] + dragBox.getHeight()) {
mItemX = item.getLeft();
mItemY = item.getTop();
return touchPos;
}
}
}
return MISS;
}
@Override
public int getPosition(Object item) {
for (int i = 0; i < ThemeCards.values().length; i++) {
if (getItem(i).equals(item)) {
return i;
}
}
return AdapterView.INVALID_POSITION;
}
/**
* 获取子项的第一项position（包含HeaderItem与FooterItem，不包含HeaderView及其占用的空白View）
* 原Adapter无Item并且也无HeaderItem与FooterItem时，返回 AdapterView.INVALID_POSITION
*
* @return 子项的第一项position
*/
public int getFirstItemPosition() {
// adapter有值或者有HeaderItem
if ((mAdapter != null && mAdapter.getCount() > 0)
|| getHeaderItemsCount() > 0 || getFooterItemsCount() > 0)
return getHeaderViewsCount();
else
return AdapterView.INVALID_POSITION;
}
public int viewIdHitPosition(MotionEvent ev, int id) {
final int x = (int) ev.getX();
final int y = (int) ev.getY();
int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
final int numHeaders = mDslv.getHeaderViewsCount();
final int numFooters = mDslv.getFooterViewsCount();
final int count = mDslv.getCount();
// Log.d("mobeta", "touch down on position " + itemnum);
// We're only interested if the touch was on an
// item that's not a header or footer.
if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
&& touchPos < (count - numFooters)) {
final View item = mDslv.getChildAt(touchPos - mDslv.getFirstVisiblePosition());
final int rawX = (int) ev.getRawX();
final int rawY = (int) ev.getRawY();
View dragBox = id == 0 ? item : (View) item.findViewById(id);
if (dragBox != null) {
dragBox.getLocationOnScreen(mTempLoc);
if (rawX > mTempLoc[0] && rawY > mTempLoc[1] &&
rawX < mTempLoc[0] + dragBox.getWidth() &&
rawY < mTempLoc[1] + dragBox.getHeight()) {
mItemX = item.getLeft();
mItemY = item.getTop();
return touchPos;
}
}
}
return MISS;
}
private void clickAdapterView(AdapterView parent) {
final int position = parent.getPositionForView(MaterialRippleLayout.this);
final long itemId = parent.getAdapter() != null
? parent.getAdapter().getItemId(position)
: 0;
if (position != AdapterView.INVALID_POSITION) {
parent.performItemClick(MaterialRippleLayout.this, position, itemId);
}
}
public int viewIdHitPosition(MotionEvent ev, int id) {
final int x = (int) ev.getX();
final int y = (int) ev.getY();
int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
final int numHeaders = mDslv.getHeaderViewsCount();
final int numFooters = mDslv.getFooterViewsCount();
final int count = mDslv.getCount();
// Log.d("mobeta", "touch down on position " + itemnum);
// We're only interested if the touch was on an
// item that's not a header or footer.
if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
&& touchPos < (count - numFooters)) {
final View item = mDslv.getChildAt(touchPos - mDslv.getFirstVisiblePosition());
final int rawX = (int) ev.getRawX();
final int rawY = (int) ev.getRawY();
View dragBox = id == 0 ? item : (View) item.findViewById(id);
if (dragBox != null) {
dragBox.getLocationOnScreen(mTempLoc);
if (rawX > mTempLoc[0] && rawY > mTempLoc[1] &&
rawX < mTempLoc[0] + dragBox.getWidth() &&
rawY < mTempLoc[1] + dragBox.getHeight()) {
mItemX = item.getLeft();
mItemY = item.getTop();
return touchPos;
}
}
}
return MISS;
}
private boolean performAdapterViewItemLongClick() {
if (getOpenStatus() != Status.Close) return false;
ViewParent t = getParent();
if (t instanceof AdapterView) {
AdapterView view = (AdapterView) t;
int p = view.getPositionForView(SwipeLayout.this);
if (p == AdapterView.INVALID_POSITION) return false;
long vId = view.getItemIdAtPosition(p);
boolean handled = false;
try {
Method m = AbsListView.class.getDeclaredMethod("performLongPress", View.class, int.class, long.class);
m.setAccessible(true);
handled = (boolean) m.invoke(view, SwipeLayout.this, p, vId);
} catch (Exception e) {
e.printStackTrace();
if (view.getOnItemLongClickListener() != null) {
handled = view.getOnItemLongClickListener().onItemLongClick(view, SwipeLayout.this, p, vId);
}
if (handled) {
view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
}
}
return handled;
}
return false;
}
private int viewIdHitPosition(MotionEvent ev, int id)
{
final int x = (int) ev.getX();
final int y = (int) ev.getY();
int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
final int numHeaders = mDslv.getHeaderViewsCount();
final int numFooters = mDslv.getFooterViewsCount();
final int count = mDslv.getCount();
// Log.d("mobeta", "touch down on position " + itemnum);
// We're only interested if the touch was on an
// item that's not a header or footer.
if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
&& touchPos < (count - numFooters))
{
final View item = mDslv.getChildAt(touchPos - mDslv.getFirstVisiblePosition());
final int rawX = (int) ev.getRawX();
final int rawY = (int) ev.getRawY();
View dragBox = id == 0 ? item : item.findViewById(id);
if (dragBox != null)
{
dragBox.getLocationOnScreen(mTempLoc);
if (rawX > mTempLoc[0] && rawY > mTempLoc[1] &&
rawX < mTempLoc[0] + dragBox.getWidth() &&
rawY < mTempLoc[1] + dragBox.getHeight())
{
mItemX = item.getLeft();
mItemY = item.getTop();
return touchPos;
}
}
}
return MISS;
}
private boolean launchDragAndDrop(final MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
mCurrentPosition = mDragPosition = mDropPosition = pointToPosition(mDragPosition, x, y);
if (mDragPosition != AdapterView.INVALID_POSITION && mDragAndDropListener.isDragAndDropEnabled(mDragPosition)) {
mDragOffsetX = (int) (event.getRawX() - x);
mDragOffsetY = (int) (event.getRawY() - y);
startDrag(x, y);
return true;
}
return false;
}
private void onDrop() {
destroyDragImageView();
removeCallbacks(mDelayedOnDragRunnable);
View v = getChildAt(mDropPosition);
v.setVisibility(View.VISIBLE);
v.clearAnimation();
if (mDragAndDropListener != null && mDropPosition != AdapterView.INVALID_POSITION) {
mDragAndDropListener.onDropItem(mDragPosition, mDropPosition);
}
mDragPosition = mDropPosition = mCurrentPosition = AdapterView.INVALID_POSITION;
mDragAndDropStarted = false;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch(ev.getAction()){
case MotionEvent.ACTION_DOWN:
mDownX = (int) ev.getX();
mDownY = (int) ev.getY();
//根据按下的X,Y坐标获取所点击item的position
mDragPosition = pointToPosition(mDownX, mDownY);
// Log.d("mDagPosition is", "" + mDragPosition);
if(mDragPosition == AdapterView.INVALID_POSITION){
return super.dispatchTouchEvent(ev);
}
//使用Handler延迟dragResponseMS执行mLongClickRunnable,
// 大于20dp才执行mLongClickRunnable避免与Drawlayout发生冲突
int panding = (int) CommonUtil.convertDpToPixel(mcontext,20);
if(mDownX > panding) {
mHandler.postDelayed(mLongClickRunnable, dragResponseMS);
}
//根据position获取该item所对应的View
mStartDragItemView = getChildAt(mDragPosition - getFirstVisiblePosition());
//
mPoint2ItemTop = mDownY - mStartDragItemView.getTop();
mPoint2ItemLeft = mDownX - mStartDragItemView.getLeft();
mOffset2Top = (int) (ev.getRawY() - mDownY);
mOffset2Left = (int) (ev.getRawX() - mDownX);
//获取DragGridView自动向上滚动的偏移量，小于这个值，DragGridView向下滚动
mDownScrollBorder = getHeight() / 5;
//获取DragGridView自动向下滚动的偏移量，大于这个值，DragGridView向上滚动
mUpScrollBorder = getHeight() * 4/5;
//开启mDragItemView绘图缓存
mStartDragItemView.setDrawingCacheEnabled(true);
//获取mDragItemView在缓存中的Bitmap对象
mDragBitmap = Bitmap.createBitmap(mStartDragItemView.getDrawingCache());
//这一步很关键，释放绘图缓存，避免出现重复的镜像
mStartDragItemView.destroyDrawingCache();
break;
case MotionEvent.ACTION_MOVE:
int moveX = (int)ev.getX();
int moveY = (int) ev.getY();
//如果我们在按下的item上面移动，只要不超过item的边界我们就不移除mRunnable
if(!isTouchInItem(mStartDragItemView, moveX, moveY)){
mHandler.removeCallbacks(mLongClickRunnable);
}
break;
case MotionEvent.ACTION_UP:
mHandler.removeCallbacks(mLongClickRunnable);
mHandler.removeCallbacks(mScrollRunnable);
break;
}
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if ((mDragListener != null || mDropListener != null) && mDragView != null) {
int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
Rect r = mTempRect;
mDragView.getDrawingRect(r);
stopDragging();
if (mDropListener != null && mDragPos >= 0 && mDragPos < getCount()) {
mDropListener.drop(mFirstDragPos, mDragPos);
}
unExpandViews(false);
break;
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
int x = (int) ev.getX();
int y = (int) ev.getY();
dragView(x, y);
int itemnum = getItemForPosition(y);
if (itemnum >= 0) {
if (action == MotionEvent.ACTION_DOWN || itemnum != mDragPos) {
if (mDragListener != null) {
mDragListener.drag(mDragPos, itemnum);
}
mDragPos = itemnum;
doExpansion();
}
int speed = 0;
adjustScrollBounds(y);
if (y > mLowerBound) {
// scroll the list up a bit
speed = y > (mHeight + mLowerBound) / 2 ? 16 : 4;
} else if (y < mUpperBound) {
// scroll the list down a bit
speed = y < mUpperBound / 2 ? -16 : -4;
}
if (speed != 0) {
int ref = pointToPosition(0, mHeight / 2);
if (ref == AdapterView.INVALID_POSITION) {
// we hit a divider or an invisible view, check
// somewhere else
ref = pointToPosition(0, mHeight / 2 + getDividerHeight() + 64);
}
View v = getChildAt(ref - getFirstVisiblePosition());
if (v != null) {
int pos = v.getTop();
setSelectionFromTop(ref, pos - speed);
}
}
}
break;
}
return true;
}
return super.onTouchEvent(ev);
}