Develop Reference

Highlighting the list item of a list view in android for a specif time

In my android application i'm having a list view and some items in that,now my requirement is when I select a particular item from that list the list item should be highlighted with a red color, and that selection should not be disappear because in my application i should choose an item from the list view and i should click a button(submit).
So in order to know to the user that he has selected an item from the list view it should be highlighted until he clicks submit button.
I have used choice Mode attribute and set the value to single choice and i have changed the color for highlighting everything works fine but i need it not to be disappeared until user clicks the submit button
The variable val consists of some names which i retrieved from database.
Please help me to solve this Thanks in advance.
ArrayAdapter<String> adptr= new ArrayAdapter<String>(this,R.layout.row,R.id.member_name,array);
lv.setAdapter(adptr);
lv.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View v, int pos,
long id) {
// TODO Auto-generated method stub
val=lv.getItemAtPosition(pos).toString();
//Toast.makeText(getApplicationContext(), val, 5000).show();
}
});

use OnItemClickListener
ListView lview = getListView();
int pos =0;
lview.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> adapter, View v, int position,
long arg3)
{
// set the background of v here
if (position == pos)
// reset the background color
// and pos = position;
else
get the previous listitem view and reset it's background to original
}
});

Actually I had the same problem sometime back. I was working on non touch andorid ui application for google tv.
The solution is like this.
1) create a custom ArrayAdapter (extending ArrayAdapter)
2) onItemClick get the position of the item.
3) send that position to your adapter by some public method say setCurrentPosition(int pos)
4) in getView() of the adapter check for the position and set the background to red for that view.
Hope this will work as it worked for me.

Retrieve data from SQLite in a ListView

Hi guys so I have this doubt. I've created an app that stores data in a SQLite and its displayed on a Listview in the Main Activity. What I'm trying to do is once I click one item from the list it should open an image from sd card. So my question is how can I use onClick here since I don't know the longitude of the list? And may I include the onclick for the list in the switch I've got?
UPDATED:
I forgot to say that that I would like to open an image stored in the sdcard when I click a item of the list.
That's what I've got for now:
Contact_listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Cursor cursor = (Cursor) parent.getItemAtPosition(position);
String lat = cursor.getString(cursor.getColumnIndexOrThrow("lat"));
Toast.makeText(getApplicationContext(), lat, Toast.LENGTH_SHORT).show();
}
});
All comments or suggestions are welcomed. Thanks!

Use setOnItemClickListener() method:
Contact_listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, final int selectedIndex, long arg3) {
}
);

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();
}
});

How to know when a listitem in a listview is focused(highlighted) in Android?

I searched a lot but I couldn't find a straight way for that. All I need is when I clicked on a menu-item I can realize that which on of items in the list is focused?
For example in the blow picture how can I know which item is highlighted(when i clicked on a button for example on the Back Button)?

You must implement an OnItemClickListener
myList.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
YourClass yourObject = (YourClass) arg0.getItemAtPosition(arg2);
}
}

This should do it:
http://developer.android.com/reference/android/widget/AdapterView.html#getSelectedItemPosition()
or keep a reference of the current selection.

How to get a particular row in listview to perform its own operation?

I am new to android programming. I need some help here. I have used this site example on creating a listview. What I want to achieve is when the user clicks a particular row, the row clicked will perform its respective action. (Eg. When clicked row 1 will show a toast. When clicked row 2 will direct the user to another new view, etc.)
I have set a OnItemClickListener to the listview but am lost on how to do it. Any help will be appreciated. Thanks!
Below is my code:
.......
final ListView list = new ListView(this);
list.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(Adapter<?> arg0, View v, int i, long l){
// At implementation
}
});
.......

It looks like you're on the right track, everything should be clearer with onItemClick's parameter names :
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(getApplicationContext(), "Clicked row " + position,
Toast.LENGTH_SHORT).show();
}
So you actually get the position of the item clicked, and can have a different action for each item.

To get the index of the selected item:
int selected_item = myListView.getPositionForView(view);
or to get the string:
String chosen_item = (myListView.getItemAtPosition(selected_item).toString());
If your class is extending ListActivity replace "myListView" with "this".