如何从ListView获取数据。 （我的列表视图有3个项目）

Question

I want retrieve the data from the Listview, where my list is having 4 items like, name, date, sem, category.

i want to read the text present in the list view and pass it to another activity.

Answer 1

If you are retrieving your data from server then you need to get item on item click of ListView. Like

  listview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

              String name =urarraylist.get(position).get("name");// here you have to pas keyname which is put inyour Hashmap arraylist
              String category =urarraylist.get(position).get("category");
              String date=urarraylist.get(position).get("date");
              String sem=urarraylist.get(position).get("sem");
              Intent i = new Intent(getBaseContext(),anotheractivity.class);
              i.putExtra("name", name);
              i.putExtra("category ", category );
              i.putExtra("date", date);
              i.putExtra("sem", sem);
              startActivity(i); 
            }
        });

Now retrieve this data in your next Activity on onCreate() method. Like

       Intent n = getIntent();
       String name = n.getStringExtra("name");
       String category = n.getStringExtra("category ");
       String date= n.getStringExtra("date");
       String sem= n.getStringExtra("sem");

Answer 2

As it's name suggest, a ListView doesn't contains data, it only contains Views . These views are often created from an array or a List via an Adapter . So you have to ask your adapter to retrieve the data.

Unfortunately there is no default method for that, so you'll have to create your own getter, or you can also loop on the getItem() method associated with the getCount() one on your ListView's adapter.

Answer 3

listview.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                 String name=(String)parent.getItemAtPosition(position);
                  Intent i = new Intent(getBaseContext(),anotheractivity.class);
                  i.putExtra("USERNAME", name);
                  startActivity(i); 
                }
            });

if you click the listview row the value from corresponding position will be fetched and passed to intent and further to next activity.

The magic lies here:

 String name=(String)parent.getItemAtPosition(position);