Develop Reference

ListView example program which switches to new activity

Could anyone possibly give me an entire example for demonstrating a ListView.
Each item in listview needs to fire a new activity.
For ex, if I use 'Subjects' as content of ListView then after pressing particular a subject from listview , a new screen with its title and some content of that subject gets displayed.
I know this is too much to ask, but i have been looking for ListView Ex. since quite long and nothing has helped me so far. PLease Help
Thank you

yourlistview.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
then use bundle to send some content to your next activity.
then getActionBar.setTitle(sometext); this text is come from your bundle.
This contains:
http://www.androidbegin.com/tutorial/android-search-listview-using-filter/

you can refer following link for listview demo code.
http://www.androidhive.info/2011/10/android-listview-tutorial/
and for opening new activity on selecting any item, you can use,
listCoupon.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
// here you can compare selected item by its position and then start a new activity
// arg2 is selected item position in your arraylist
}
});

Android:position of an element in a scrollable window

I have 20 buttons in vertical layout in a scrollable window. While click on a button I want to know the position of that button on screen.Some times I click the button after a scrolling.I want the exact position at that time too.What is the code for that.please help me.

Never use 20 buttons inside layout. Use listview with button and use onitem click of listview and get button position:
list view onitem click:
listId.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View v, int pos, long id) {
-------Here position displays **pos**----
}
});
Refer this example for a nice listview sample

lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
System.out.println("this is position"+lv.getItemAtPosition(arg2)
}
});

Show/Hide button in listview android,

Can anyone knows how can i make something like this in ListView ?
When a item in ListView is Clicked the imageButton get Visible.
http://img850.imageshack.us/img850/2377/is4t.png
Then you click another item and the previus item that you clicked get invisible , and the actual item get the image button visible.
http://img14.imageshack.us/img14/1920/lnpy.png
I have searched about this , but i haven't found something to work exactly i want. And i have tried to make the button visible onItemClick for that view , but , when i click another button , the previus item still visible. I have tried to do notifyDataBaseChanged but still there. Thanks for help , and sorry for my bad english.
¿How can i get access on the previous Item View to set button to View.GONE ?
Code :
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long arg3) {
// TODO Auto-generated method stub
MPlayer.playSong(position);
Button bPlaying = (Buttton)view.findViewById(R.id.button1);
bPlaying.setVisibility(View.VISIBLE);
ca.notifyDataSetChanged();
}
});

Not the best solution but hope this might help you solving you the problem
private Button previousButton = null;
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {
MPlayer.playSong(position);
if(previousButton != null){
previousButton.setVisibility(View.GONE);
}
Button bPlaying = (Buttton)view.findViewById(R.id.button1);
bPlaying.setVisibility(View.VISIBLE);
previousButton = bPlaying;
ca.notifyDataSetChanged();
}
});

List.Remove always removes last item for ListView

When i try to remove a specific item from a list View:
buyButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
tempToken -= selPerk.cost;
plrPerks.add(selPerk);
String tokStr = String.valueOf(tempToken);
tkn.setText(tokStr);
shopItems.remove(selPerk);
selPerk = new Perk();
perkDialog.dismiss();
}
});
It always seems to remove the last item. This is where i open the dialog:
perks.setClickable(true);
perks.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
Perk perk = (Perk) perks.getItemAtPosition(position);
showItem(perk);
}
});
}
This is the show Item function:
public void showItem(Perk perk) {
if (tempToken >= perk.cost) {
selPerk = perk;
How do i remove a specific item from a list and list view respectively?
Thanks for your time :)

In "setOnItemClickListener" listener, you are getting the perk object. So you can remove that object from your list like this-
shopItems.remove(perk);
and then you can call-
your_adapter.notifyDataSetChanged();
to refresh your listview.

To remove a specific item from a list view, your can call removeView(View toBeRemoved) if you have a reference to the view you wish to remove. If you have the index, you can call removeView(int index).
http://developer.android.com/reference/android/widget/ListView.html
You can remove a specific item from a list in the same way, using remove(Object item) or remove(int index).
http://docs.oracle.com/javase/7/docs/api/java/util/List.html
Hope this helps!

I fixed it. Whenever i removed an item i had to do it like so:
shopItems.remove(selPerk);
perk_adapter.notifyDataSetChanged();
So i had to notify my listeview adapter that i removed an item.

android get position of clicked item in gridview

as we know using android grid view, we can do the following and get notified when item is clicked:
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(PopularCapitActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
we also know that, if the cell in the grid contains a clickable item, say a button, the above won't get fired.
so currently i have a grid view, each cell has its own button, so now when user clicks on the button, it will have its own action based on the cell the button resides in, my question is, how can i access the cell position in the button handler?
thanks

Assuming you are using a custom adapter for the GridVIew, in the getView method you can simply add a tag to the Button object that contains the position passed into getView:
button.setTag(new Integer(position));
Then, in the onClickListener method, with the view that is passed in (the button) you can do:
Integer position = (Integer)view.getTag();
And then handle the position value from there.
EDIT:
It appears the best practice would be to do:
button.setTag(Integer.valueOf(position));
rather than using the Integer constructor.

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
String a = String.valueOf(position);
Toast.makeText(getApplicationContext(), a, Toast.LENGTH_SHORT).show();
}
});