I am trying to set item selected in OnItemClick event in ListView and it just wouldn't leave item selected. What am I doing wrong?
lView.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(#SuppressWarnings("rawtypes") AdapterView parent, View clickedview, int position, long id)
{
clickedview.setSelected(true);
mItemsAdapter.select(position);
}
});
few things:
1. I am trying to implement Multiple Select on the list View.
2. I cannot extend from ListActivity because Activity extends from BaseActivity custom class already.
3. mItemsAdapter is a custom ItemsAdapter adapter that extends BaseAdapter.
4. I don't need a checkbox in there, just to be able to see the row selected is fine.
5. ItemsAdapter overrides getView() and sets the layout of the row by inflating xml
I could manage to get an item of a ListView to be set as selected when long-clicked:
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
parent.requestFocusFromTouch(); // IMPORTANT!
parent.setSelection(position);
return true;
}
It only worked after I called requestFocusFromTouch().
I currently don't have much time. So I'll take a look again later this day.
Anyway take a look at my previous questions, I was struggling with the same:
Change ListView background - strange behaviour
Clickable ListView
In case the solution for you is not in there (I think it's in the first one) we will need more code, in order to help you.
Hope this helps a bit.
I have not had much luck using the built in functionality for selection.
I see you have your own custom adapter, which I am guessing means your inflating custom views as rows. If your row has anything more then a checkedtextview I don't think you will be able to correctly use setSelections.
I solved this problem by using my own models and functions. Each item in the list had data with it to determine it if was selected or not. I could then iterate though that array, toggle selections with and and even update the UI by changing values and calling notifydatasetchanged on the adapter (which used getView and checked against my selection model to draw checks).
Related
Good day. I have an android application which displays a ListView. Upon clicking the any of the rows, I want all other rows to be grayed out. I am using a custom ListView with my own BaseAdapter and I know I can create an onclick function on the getView function there. However, doing so invalidates the onItemClick function I have in my base activity that's why I want to do this in my base activity as much as possible.
Here is how I made my onItemClick function:
resultListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view,
int position, long id) {
// TODO Auto-generated method stub
resultListView.smoothScrollToPositionFromTop(position, 0);
resultListView.setClickable(false);
resultListView.setScrollContainer(false);
resultListView.setEnabled(false);
};
});
}
Is there a way to gray out all the other items except for the chosen item? Even changing the alpha/lowering it would help. I want to give the user an impression that the other list items are not clickable. I'm currently having a tough time figuring it out. Any help is very much appreciated, thank you.
EDIT
I am able to adjust the alpha by doing:
resultListView.setAlpha((float) 0.5);
However, it affects the whole row and I am unable to adjust the alpha for the selected row.
Create class to hold variables. Pass this class to the adapter instead of string for example. Create a boolean variable isSelected in your class. Set isSelected in onItemClick(), and enable/disable the views from getView() depending on your isSelected variable.
i am trying to change the background color of the selected row in a listview and i am able to do it.
But when i am clicking on another row then the background color of the previously selectedrow remains unchanged. I have the position of the previously selected row, Can anybody help me that how can change the background color of previously selected row as it was before??
If you keep track and update the listItems clicked state in your model you can just put the code for displaying has been clicked-color in the adapter and then call
adapter.notifyDatasetChanged();
I think this might be easier if you look at it another way.
Currently, your logic is "if I click on this row, change its color to a special color and change the old row's color back to the original color". However, this doesn't seem to be the logic you actually want. Rather, you want the last clicked (aka selected) row to be a different color.
You haven't posted any code, so I don't know if you are implementing your own ListAdapter in this project. That is the approach I would take. Create a class which extends ListAdapter, and create an additional private variable that stores the position of the last selected row. Then in the overriden getView() method, do a quick check
if(rowPosition == lastSelectedRowPosition)
viewToReturn.setBackgroundColor();
If you aren't sure how to make your own list adapter, check out the tutorial at http://jnastase.alner.net/archive/2010/12/19/custom-android-listadapter.aspx.
In your activity use setOnItemClickListener of Your_List Object.
See Demo Code:
list1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter, View v, int position, long id) {
v.setBackgroundColor(Color.BLUE); // <--- Use color you like here
// ^ this v gives current row.
}
});
This will make background color changed for that row forever.
I want to have one ListView that when I click on the item the view slide out to the left.
So I have:
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
arg1.startAnimation(openAnimation);
}
});
However, animation applied to the different item in the list instead of the one being clicked on. The behavior seems to be random as sometime it happened to more than one item at the same time.
As I suspected this is because of the way Adapter reuse it's view to create item. I went to modify the getView method in my Adapter to inflate new view every time it's being called. Then the animation doesn't happen any more.
Is there a way to resolve this? I tried to move the animation to inside my Adapter but then I can not associate it with other action on the Listview.
Ultimately, I want the item to be clickable but when swipe left/right reveal delete button (iOS delete behavior). Am I on the wrong track here? This should be possible though as Android can implement swipe to remove in the Notification bar.
I recommend that you check this thread also.
I don't think, that this is possible without having to modify your adapter to suit this type of behavior. For what I understand, you don't have any problems with implementing the code recognizing the swipe gestures on different ListView-rows, only with the animation the should follow this gesture on according row(s).
I'd rewrite the adapter to suit at least 2 row types: normal rows, and rows to be deleted. In the "getView()" method of your adapter, you should only reuse the convertView of normal Views. Rows that are to be deleted should not reuse them, so that animating one would not modify the others.
Upon clicking a normal row, you should first tell the adapter that the row on the clicked position is now of type to-be-deleted, call .notifyDatasetChanged(), and then start the animation on that row.
I am modifying an adapter view. How do I implement the setSelection() of an AdapterView? What are the steps one must take when setSelection() method of an adapterview is called?
I tried browsing through ListView's source code, but it wasn't of much help.
Save the selected position and pass it to the BaseAdapter class. (You have to implement a custom Base Adapter class).
Then in getView() method, change as per your requirement by checking position==selectedPosition. (Note: you should call notifyDatasetChange() method to invoke getView() method again).
try List view onItemClick()
listView.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,long id) {
}
});
According to this and this you have to save selected item somewhere, show user that this item is selected(if you are not in touch mode), and you need to scroll view to this item.
Android-HorizontalListView is having HorizontalListView, which is an Android ListView widget which scrolls in a horizontal manner. In this class it's describes how to implement the setSelection() of an AdapterView.
I am using a ListView with a SimpleAdapter. Once data is populated into it I would like to set the first item in the list. This can be done by clicking on the list item on the screen. I want to just call the method directly after I populate the list so that when you see the UI its already done. My only problem is getting the View from the ListView. I noticed its children are all null but the SimpleAdapter has items in it. When I try to get those items they are not Views and I am not able to match the method call of
protected void onListItemClick(ListView l, View v, int position, long id)
because I cant get the right View. Any help would be appreciated.
After lots of searching the solution is not to make a manual call but to override the adapter getView method. That way I can change the background color and not have to manually call onListItemClick()