In my layout I have a button and a listview. How can I change the imageview of item I selected when the button is clicked. So lets say, I select 5 items, and after I click the button, images for those 5 items will be changed.
So I am confused what function I should use. Right now i used button.setOnClickListener but it seems wrong because only the very first item's imageview will be changed when button clicked. Should I use listview.setItemOnClickListener? Or is there any other way I can do this?
Thanks a lot!
Add a boolean to the data object in your adapter. Say you've got ArrayAdapter<MyDataObject>. Add some kind of "selected" field in the MyDataObject, and toggle it when you "select" the row.
Override getView in the adapter (you'll need a custom Adapter, btw. I'd just extend ArrayAdapter). When you render the row, if the "selected" field is true, show the "other" image.
When you click the button, call 'notifyDataSetChanged' on the adapter. The will cause the visible rows to refresh themselves (and call getView for each).
I think that'll work.
Since you only want images to change when you click the button, you'll need to have some kind of global boolean, so the getView won't show the image until the button has been clicked.
The complication here is, you have to deal with rows that may have been scrolled out of view, which don't have active views, but logically exist. It would be really hard to explain the concept here. I'd suggest some tutorials on ListView if you're not familiar with the recycling of row views.
You can used custom baseadapter for listview and setonclicklistener in the getView() method.... see tutorial here this is hope for help
You can use button click listener as well as on itemClickListener too but to make a image view in selected state in a list, you have to call setSelected method of imageview parent layout.
Please put a comment if you don't get me.
Thanks
Related
I'm stuck on a little problem.
When I click on a row in my RecyclerView, I'd like to change its color to some other color (i.e.: red).
Then, if I click this row again, I would like to set its color back to the normal one (i.e.: white).
Then, if I click on a second row or n-th row, I would like to do the same.
I've tried to work on the RecyclerView Adapter class, in my ViewHolder I tried some ideas counting user clicks, setting a boolean to check the colored rows, and getAdapterPosition to know what is the row's position... but actually all my tries failed!
Would you please help me with that problem?
It seems that I'm close to the solution, but need a little help
You're going to need to keep track of which items were selected on the list (otherwise any changes to the view will simply be recycled).
Keep a list of selected items within your adapter. In the adapter's onBindViewHolder you can check against the list and if the list contains the view/item, you can color the view accordingly.
Edit: Refer here for a working example
How to properly highlight selected item on RecyclerView?
This is a request for a best practice for handling the views in the onItemClick events in a ListView.
Each view in my ListView contains an ImageView, some TextViews, and a CheckBox wrapped in a RelativeLayout. On the item view being selected anywhere, I'd like to have the checkbox ticked/unticked as required. I would also like to have the option to change the view style i.e. so the item is highlighted by colouring the stroke.
My current issue is similar to everyone else who does this. Due to ListView recycling, if I grab the View passed into onItemClick and set the backgroundresource or checkbox checked value, it also changes them for Views that aren't currently rendered. I'd like to know the best way to achieve this goal.
I know there is a pattern to handle the CheckBox events in the ArrayAdapter directly by implementing an onClickListener, but I believe this will only respond to direct selection of the CheckBox; it will ignore any clicks on the rest of the view. Plus, if the CheckBox onClick event is fired, it will consume the click event so onItemClick won't fire, which I need to set my data.
Also, using CheckedTextView will not work since it is inside the RelativeLayout, which won't pass the checked event to the ListView. There was a post where it was recommended to create your own CheckedViewLayout that implements Checkable to handle the View checked events. If I go ahead with this, will I be able to reference my new layout class in xml, or would I then have to design each of my views again but in Java code?
If anyone else has a better solution, then please let me know.
Hey I think this link may be useful to you,there is a details for you
Android ListView Checkbox Example - OnItemClickListener() and OnClickListener()
In the end, I created my own CheckableRelativeLayout that implemented Checkable and used it as the main container for each ListView item. I used a Boolean value within CheckableRelativeLayout to track whether the view was clicked or not.
If required, I can post the final class.
I have a list view which has a couple of views within it, I have a textView and an ImageView.
What I need to do is, I want a person to be able to click just on the imageView without causing the onItemClicked function to be invoked, If the person clicks the ImageView, it should do something else, but if the person clicks away(apart from the imageview) from the imageView, then the onItemClicked is fired.
How do I do this?
It is kinda like, the listView on the android phone callLogs whereby, the green phone icon is somehow separated from the list but when clicked, it should know which listItem was selected and act accordingly.
I will appreciate the help. Thanks.
Here are some links for you are looking for. Advanced but if you stick with it and dont give up on this, you will learn a ton!!! Take a look:
Android: ListView elements with multiple clickable buttons
Android custom list item with nested widgets
use holder.imageView.setOnClickListener() in getView() method of adapter class.
When you touch some grid or listview items in an android app, he change the background color telling you that you have pressed it.
I'm having a problem in my app. When I create that a listview for instance, and I press it in my phone, he change color, but if I set the OnClick property, the item dont change it color. Whats wrong? The OnClick works as its suppose.
Thanks
Generally with ListView you want to use an OnItemClickListener.
This gives you a chance to perform an action based on the position in the list that was clicked.
If you need access to the view adapter from within onItemClick then you can use AdapterView#getAdapter() on the AdapterView that is supplied to you.
I have created one list view.. it is having 5 items...
Now I want split the list items...
when user clickon the first listitem or focus on first item then immediately it has to show followed some text views or other things..but it has to show same list..
and agian same when he clickon or focus on the second item that first item has to be close and second item has to act some thing....
I think you need to implement the concept of "Expandable Listview", so that the clicking on one item, it will be expanded with their sub-items.
Refer the android-sdk page of Expandable ListView: http://developer.android.com/reference/android/widget/ExpandableListView.html
For having an example, check this site: http://mylifewithandroid.blogspot.com/2008/05/expandable-lists.html
Pls, check the below image, do you want to perform as same ????
If you want to do the same, it is already given in the "API-Demos" at Views/Expandable Lists/1. Custom Adapter.
Enjoy !!
The problem is that you cannot use the standard ListView in your case, because in the standard ListView, the View of each row has to be one TextView.
In your case, you need it to be at least two TextViews (The standard Text, and the one that's gonna show up onClick/onFocus).
You have to create your custom ListAdapter, and override the getView() function.
Here is a code snippet that shows how to do it properly:
Custom Adapter
In the getView(), you have to inflate the XML file that describes your List Row, and return it.
In your case, I believe your XML file should contain 2 TextViews, one visible and one invisible.
Then, to handle the clicks, you can set a onItemClickListener on your ListView in your Activity class.
The best way may be to have your Activity class implementing onItemClickListener, and to use this onItemClickListener to handle those.
In the onClick() function, you just have to set the Visibility of your hidden TextView to VISIBLE.
You need to build custom rows, and handle showing more text on each row, there is no easy magicall way of doing it, but inflating your own rows, and setting a couple of attributes visibility isnt all that hard either.