smoothScrollToPositionFromTop (int position, int offset) > 안드로이드 플랫폼 지식 공유

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안드로이드 플랫폼 지식 공유

smoothScrollToPositionFromTop (int position, int offset)

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작성자 LUG 작성일14-12-05 15:57 조회7,852회 댓글0건

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public void smoothScrollToPositionFromTop (int position, int offset)

Added in API level 11 

 

Smoothly scroll to the specified adapter position. The view will scroll such that the indicated position is displayed offset pixels below the top edge of the view. If this is impossible, (e.g. the offset would scroll the first or last item beyond the boundaries of the list) it will get as close as possible.

 

Parameters

position Position to scroll to

offset Desired distance in pixels of position from the top of the view when scrolling is finished 

 

public void smoothScrollToPosition (int position)

Added in API level 8

 

Smoothly scroll to the specified adapter position. The view will scroll such that the indicated position is displayed.

 

Parameters

position Scroll to this adapter position. 

 

public void setSelectionFromTop (int position, int y)

Added in API level 1

 

Sets the selected item and positions the selection y pixels from the top edge of the ListView. (If in touch mode, the item will not be selected but it will still be positioned appropriately.)

 

Parameters

position Index (starting at 0) of the data item to be selected.

y The distance from the top edge of the ListView (plus padding) that the item will be positioned. 

 

===

 

try {

if (Build.VERSION.SDK_INT >= 11) {

main_lv_filelist.smoothScrollToPositionFromTop(pos, 0);

} else if (Build.VERSION.SDK_INT >= 8) {

int firstVisible = main_lv_filelist.getFirstVisiblePosition();

   int lastVisible = main_lv_filelist.getLastVisiblePosition();

   if (pos < firstVisible) {

main_lv_filelist.smoothScrollToPosition(pos);

   } else {

main_lv_filelist.smoothScrollToPosition(pos + lastVisible - firstVisible - 2);

   }

} else {

main_lv_filelist.setSelectionFromTop(pos, 0);

}

} catch (Exception e) {} 

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