this example: http://saigeethamn.blogspot.com/2010/04/custom-listview-android-developer.html .There are 3 textview ids at custom_row_view.xml. There are 3 row data inside one position listitem when using onListItemClick. how to extract these data? how to use the id? Anyway to get row view data in the list view when the list item is clicked
[protected void onListItemClick(ListView l, View v, int position, long id]?
The parameter View v itself is the row view. You can get the attached data by calling v.getTag(). Should set it earlier in getView of adapter using v.setTag(Object)
Depends on the kind of data. For example id does contain the _id from a database table row that was set with one of the CursorAdapters. Usually this is the PK of that database table row.
listView.getAdapter().getItemAt(position)
gets you the object bound to the view V
I would like to recommend you not to get data from the view, instead use the ArrayList you have used to set data to the Adapter of the ListView.
In the example which you have pointed out, you are using an ArrayList of HashMap. So for an example..
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// arrayList is the variable which you have used as a list in your SimpleAdapter
hashMap = arrayList.get((int)id); // you need to typecast 'id' from long to int
value = hashMap.get(KEY);
}
});
Related
I have a problem with receiving _ID value when an item is clicked on listView.
I have this code:
List<SavedSearch> values = mydb.getAllSavedSearches();
ArrayAdapter<SavedSearch> adapter = new ArrayAdapter<SavedSearch>(this,
android.R.layout.simple_list_item_1, values);
//adding it to the list view.
obj = (ListView)findViewById(R.id.listView1);
obj.setAdapter(adapter);
obj.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
And my problem is that i want in onItemClick to somehow get the _ID value from database of clicked item in listView. int position and long id both are returning just position on the list.
Thanks for help, and I can say that any of previous topics helped me.
If you're using a database I would suggest you do not use an ArrayAdapter and instead use a CursorAdapter. Then simply call the method getItemId() from your CursorAdapter to retrieve the id of an item at a given position. So, do this:
CursorAdapter adapter = new CursorAdapter(Context yourAppContext, Cursor yourDBCursor, false);
obj = (ListView)findViewById(R.id.listView1);
obj.setAdapter(adapter);
obj.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
adapter.getItemId(position); // This is the _ID value
}
This is just the suggestion. I am not sure this will solve the issue.
Method 1:
Whenever you load the listView just set the id for the row and you can get the id from onItemClikListener method
Method 2:
Add an texView (set visibility gone) and set text as your id and get id using getText() method
Note
Don't use position this is always changing when the listview is reCycling.
I have a listview itemClickListener that should get the model instance associated with the row clicked.
I read about tags in http://developer.android.com/reference/android/view/View.html#setTag(int, java.lang.Object)
I know that listview recycles rows, so it would not be a good idea to use v.setTag(currentItem), because that would result in an earlier row being associated with a later item.
So to solve my original problem, it looks like I need to use setTag(int, object) where the body of my click handler needs to know the unique key. The documentation states to use a resource id value, but that is not unique amongst multiple rows. How do I get the model instance for the row I clicked on?
You should just be able to grab the item out of your adapter like this:
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
ListAdapter a = (ListAdapter)parent.getAdapter();
Object itemAtPosition = a.getItem(position);
}
I'm new to android and my scenario is as follows:
I have a list view that is bound to an array list of type Department (a simple object with id and name properties). My goal is to have the list view display the department names (done by overriding the toString() method of the Department class) and when I click on a list view item, I want to pass the ID property of the selected item to another Activity. So, how do I get the ID property on item select?
You should use this:
yourListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
}
});
Here in onItemClick you will get the position of the selected item and you can get your id like this:
yourArrayList.get(position).getDepartmentId();
You can use Get Tag / Set Tag in android for this purpose.
Following example will help :
setTag() and getTag() on ListView
You can override onItemClick method and get the position of your view
public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this AdapterView has been clicked.
Implementers can call getItemAtPosition(position) if they need to access the data associated with the selected item.
Parameters
parent The AdapterView where the click happened.
view The view within the AdapterView that was clicked (this will be a
view provided by the adapter)
position The position of the view in the adapter.
id The row id of the item that was clicked.
I have a list view that uses different layout sheets for different rows. Each sheet has different variables on them. So, when I want to implement the click listener for my list I need to know which type of row I am clicking on so that I can try to access to the correct values. For example:
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//do this for layout A
//......
// do that for layout B
//......
}
});
How can I access to the layout information and the corresponding values ?
Make sure that you have a variable in your activity where you've kept the data with which you've populated the adapter.
Then, based on the position variable, you'll be able to get the exact row which was clicked. Then based on the row, you'll be able to figure out what type of row it is, right? :)
you can use the method:
public abstract int getItemViewType (int position) of your custom adapter.
I'm developing an Android application.
I have several objects loaded on a ListActivity. I want to know the item clicked on event onListItemClick.
I see method onListItemClick has a parameter called id. How can I setup this id?
My objects are identified by an ID, how can I add this ID to listItem?
Thanks.
if SectionObj is your object that you want to access later, set that in the adapter when you set the source.
ArrayList<SectionObj> li
ArrayAdapter<SectionObj> adapter=new ArrayAdapter<SectionObj>(getApplicationContext(),android.R.layout.simple_list_item_1, li);
setListAdapter(adapter);
then in ur listener method..
protected void onListItemClick(ListView l, View v, int position, long id) {
SectionObj o=(SectionObj)getListView().getItemAtPosition(position);
}
What is the source of your list data? If you are using a cursor - then the id passed in onListItemClick(ListView l, View v, int position, long id) will automatically be the id of the cursor row.
Use the following;
listView.getItemAtPosition(position);
Where listView is the name of your list view.
You can set the id in your ArrayAdapter view.
Checkout the following pages then you should find the solution.
http://developer.android.com/reference/android/app/ListActivity.html#onListItemClick(android.widget.ListView,%20android.view.View,%20int,%20long)
http://sudarmuthu.com/blog/using-arrayadapter-and-listview-in-android-applications