Android Access child views from a ListView

Question

I need to find out the pixel position of one element in a list that s been displayed using a ListView  It seems like I should get one of the TextView s and then use getTop    but I can t figure out how to get a child view of a ListView   Update  The children of the ViewGroup do not correspond 1-to-1 with the items in the list  for a ListView  Instead  the ViewGroup s children correspond to only those views that are visible right now  So getChildAt   operates on an index that s internal to the ViewGroup and doesn t necessarily have anything to do with the position in the list that the ListView uses

User · Answer

This assumes you know the position of the element in the ListView :

  View element = listView.getListAdapter().getView(position, null, null);

Then you should be able to call getLeft() and getTop() to determine the elements on screen position.

User · Answer

This assumes you know the position of the element in the ListView :

  View element = listView.getListAdapter().getView(position, null, null);

Then you should be able to call getLeft() and getTop() to determine the elements on screen position.

User · Answer

See  Android ListView  get data index of visible item and combine with part of Feet s answer above  can give you something like   int wantedPosition   10     Whatever position you re looking for int firstPosition   listView getFirstVisiblePosition   - listView getHeaderViewsCount       This is the same as child  0 int wantedChild   wantedPosition - firstPosition     Say  first visible position is 8  you want position 10  wantedChild will now be 2    So that means your view is child  2 in the ViewGroup  if  wantedChild  lt  0    wantedChild  gt   listView getChildCount        Log w TAG   Unable to get view for desired position  because it s not being displayed on screen       return       Could also check if wantedPosition is between listView getFirstVisiblePosition   and listView getLastVisiblePosition   instead  View wantedView   listView getChildAt wantedChild     The benefit is that you aren t iterating over the ListView s children  which could take a performance hit

User · Answer

listview setOnItemClickListener new AdapterView OnItemClickListener          Override     public void onItemClick AdapterView lt   gt  parent  final View view  int position  long id            View v          int count   parent getChildCount            v   parent getChildAt position           parent requestChildFocus v  view           v setBackground res getDrawable R drawable transparent button            for  int i   0  i  lt  count  i                  if  i    position                    v   parent getChildAt i                   v setBackground res getDrawable R drawable not clicked                                        Basically  create two Drawables - one that is transparent  and another that is the desired color  Request focus at the clicked position  int position as defined  and change the color of the said row  Then walk through the parent ListView  and change all other rows accordingly  This accounts for when a user clicks on the listview multiple times  This is done with a custom layout for each row in the ListView   Very simple  just create a new layout file with a TextView - do not set focusable or clickable     No custom adapter required - use ArrayAdapter

User · Answer

See  Android ListView  get data index of visible item and combine with part of Feet s answer above  can give you something like   int wantedPosition   10     Whatever position you re looking for int firstPosition   listView getFirstVisiblePosition   - listView getHeaderViewsCount       This is the same as child  0 int wantedChild   wantedPosition - firstPosition     Say  first visible position is 8  you want position 10  wantedChild will now be 2    So that means your view is child  2 in the ViewGroup  if  wantedChild  lt  0    wantedChild  gt   listView getChildCount        Log w TAG   Unable to get view for desired position  because it s not being displayed on screen       return       Could also check if wantedPosition is between listView getFirstVisiblePosition   and listView getLastVisiblePosition   instead  View wantedView   listView getChildAt wantedChild     The benefit is that you aren t iterating over the ListView s children  which could take a performance hit

User · Answer

int position   0  listview setItemChecked position  true   View wantedView   adapter getView position  null  listview

User · Answer

This assumes you know the position of the element in the ListView :

  View element = listView.getListAdapter().getView(position, null, null);

Then you should be able to call getLeft() and getTop() to determine the elements on screen position.

User · Answer

This code is easier to use    View rowView   listView getChildAt viewIndex    The item number in the List View     if rowView    null                          Your code here

User · Answer

A quick search of the docs for the ListView class has turned up getChildCount   and getChildAt   methods inherited from ViewGroup  Can you iterate through them using these  I m not sure but it s worth a try   Found it here

User · Answer

This assumes you know the position of the element in the ListView :

  View element = listView.getListAdapter().getView(position, null, null);

Then you should be able to call getLeft() and getTop() to determine the elements on screen position.

User · Answer

A quick search of the docs for the ListView class has turned up getChildCount   and getChildAt   methods inherited from ViewGroup  Can you iterate through them using these  I m not sure but it s worth a try   Found it here

User · Answer

This code is easier to use    View rowView   listView getChildAt viewIndex    The item number in the List View     if rowView    null                          Your code here

User · Answer

A quick search of the docs for the ListView class has turned up getChildCount   and getChildAt   methods inherited from ViewGroup  Can you iterate through them using these  I m not sure but it s worth a try   Found it here

User · Answer

int position   0  listview setItemChecked position  true   View wantedView   adapter getView position  null  listview

User · Answer

listview setOnItemClickListener new AdapterView OnItemClickListener          Override     public void onItemClick AdapterView lt   gt  parent  final View view  int position  long id            View v          int count   parent getChildCount            v   parent getChildAt position           parent requestChildFocus v  view           v setBackground res getDrawable R drawable transparent button            for  int i   0  i  lt  count  i                  if  i    position                    v   parent getChildAt i                   v setBackground res getDrawable R drawable not clicked                                        Basically  create two Drawables - one that is transparent  and another that is the desired color  Request focus at the clicked position  int position as defined  and change the color of the said row  Then walk through the parent ListView  and change all other rows accordingly  This accounts for when a user clicks on the listview multiple times  This is done with a custom layout for each row in the ListView   Very simple  just create a new layout file with a TextView - do not set focusable or clickable     No custom adapter required - use ArrayAdapter

User · Answer

A quick search of the docs for the ListView class has turned up getChildCount   and getChildAt   methods inherited from ViewGroup  Can you iterate through them using these  I m not sure but it s worth a try   Found it here

[android] Android: Access child views from a ListView

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