I have a problem with checkboxes in listview.
Every raw have it's own checkbox and textview.
If i check 1st checkbox -> checked become every 5th checkbox (2-nd -> 6th)
Where is the problem?
Without some posted code it's impossible to say for sure but it sounds like an issue with View recycling in your List Adapter. If you are maintaining references to specific Views in your Activity you will have problems when the view is recycled because your reference will now point to a different view.
Related
i have list view with checkbox and if I select some item than every 9 item is selected too.
I am using onClickListener on checkbox.
Do you know how solve the situation? One item checked, but more selected.
If you wanna see my source code, just let me know and I will put there.
Thanks for help
Lukas P.
Your problem comes from views being recycled by Android. You need to store the check box state of each row in some container (eg. a list) and then explicitly set the checked state to the correct state in getView.
See this similar question:
custom ListView with checkboxes checking unchecked items
I have a scrollable listview that has 2 textViews, 3 imageButtons and 1 checkBox in each row.
In the Header of the listView, I have a delete button just above the column containing all the checkboxes of the listView.
I have to perform the delete operation of objects in the listView when 2 or more checkBoxes are checked randomly by scrolling the listView and thereafter the delete button at the top is clicked.
But the problem is that i am not getting the correct poition of the checkbox that was selected. Moreover, sometimes i get the correct position but still the object to be deleted passed is wrong. Hence the entire functionality is affected maybe due to the scrolling nature of the list.
Should i take the position in the holder of the adapter class and also bind the state of the checked or unchecked checkbox with my object.
And should I use checkBox.setOnCheckedChangeListener() or deleteButton.setOnClickListener().
If i use the latter one, then how to get all the corresponding objects of the list whose checkboxes were checked before pressing the delete button?
And where should all the related code be placed..in the listAdapter class or in the activity?
Please help me find a solution to this problem..
first of all in your getView() method you should set a specific Tag to each checkBox. For example: check1.setTag(position) then you should implement both OnCheckBoxChangeListener for your checkBoxes and OnClickListener for your delete button. As you know setting of onCheckBoxChangeListner have to be in getView() method. Then you add positions of list that their checkBox is checked to the a ArrayList with the help of getTag() method of chechBoxes in onCheckedChanged() method.
Try getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {}
I have a problem with my customized Listview with 2 TextViews and a CheckBox in each item, the problme is when scrolling the Listview, the checked items get unchecked randomly and vice versa, can anyone help to define a customized Adapter to solve this problem, i'll be so thankful
I had the same problem and I solved as follows:
I have a boolean variable isCheckedByUser. In the adapter, everytime I do something with the checkbox, i set this variable to false first, do all the things I have to with the checkbox, and set the variable to true again. Then, in the method onCheckedChanged I check if this variable is true, if so, means that the user wanted to modify the state, so I do whatever its needed with the checkbox.
In fact, this problem is not so "random". The listview reuses the cells, so that's why for you seems like the checkboxes are unchecked randomly.
Check that you correctly recycle the convertView param in getView.
If the view was already in use, ensure the checked state fits with the new item represented.
My problem is list of checkboxes are there which are checked in gridview , while scrolling the list, those checked one is turned to unchecked one.
Shiva,
If you are using custom Adapter for your list,then you can implement an ArrayList to keep track of the CheckBox State. And in your getView() function of Adapter, set your CheckBox true/false according to the ArrayList. This is a starting point for your problem. I hope you can figure out the rest. If you still have any problem, you can ask.
I've got a ListView with a custom BaseAdapter. The list items contain CheckBoxes that need to represent a property from a database.
I use CheckBox.setOnCheckedChangeListener with a new OnCheckedChangeListener to detect changes, so I can change the database based on the current state of the CheckBox. Pretty straightforward stuff so far.
However, when scrolling further down the list, previously checked CheckBoxes get unchecked. I suspect this happens as soon as the views are recycled (I'm using the convertView/ViewHolder technique).
How can I stop this? What's going wrong?
Thanks in advance.
Edit: To make things a bit clearer, the problem is that recycling views somehow calls OnCheckedChangeListener#onCheckedChanged(buttonView, isChecked) with isChecked == false.
Apparently the problem was that, by getting the checkbox using convertView.findViewById(), the onCheckedChangeListeners were still intact if the view was recycled. Calling checkbox.setOnCheckedChangeListener(null) did the trick.
Use a boolean array to store the checked state of each list item, record the changes inside setOnCheckedChangeListener(), then call setChecked() after setOnCheckedChangeListener().