Populate Listview from List - android

Im trying to populate a listview from a list, this is the method that create my list:
public List<produto> buscarProdutoPorNome(String nome){
List<produto> lista = new ArrayList<produto>();
String[] columns = new String[]{
"upc", "nome", "descricao", "qtd", "nec"};
String[] args = new String[]{nome+"%"};
db = dbHelper.getWritableDatabase();
Cursor c = db.query("produto", columns,
"nome like ?", args, null, null, "nome");
c.moveToFirst();
while(!c.isAfterLast()){
produto p = fillProduto(c);
lista.add(p);
c.moveToNext();
}
c.close();
db.close();
return lista;
}
Im wanna list, but i dont know how, someone can help me?
List<produto>lista = produtosDB.buscarProdutoPorNome("");

Why not convert the List into an array as:
producto[] array = lista.toArray(new producto[lista.size()]);
and then populate to the ListView as
setListAdapter(new ArrayAdapter<producto>(this, R.layout.list_item, array));

List<String> array = new ArrayList<String>();
// Populate the array list from the database
final ListView list = (ListView) findViewById(R.id.listview);
final ArrayAdapter<String> = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, array);
list.setAdapter(adapter);
This is the simplest way to do it, but will work for a string list only. To have an adapter with your custom class list you will need to create a custom adapter class and a custom view layout in res/layout. Find more info on custom adapters here:
http://www.vogella.com/tutorials/AndroidListView/article.html#adapterown

Related

How to get values from a spinner populated from a cursor

I've populated my spinner as this:
DatabaseConnector dbConnector = new DatabaseConnector(this);
dbConnector.open();
Cursor c = dbConnector.raw("SELECT _id, nombrecasa FROM casa");
startManagingCursor(c);
String[] from = new String[]{"nombrecasa"};
int[] to = new int[]{android.R.id.text1};
SimpleCursorAdapter adapter =
new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, c, from, to );
adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
casaSpinner = (Spinner) findViewById( R.id.casaspinner);
casaSpinner.setAdapter(adapter);
dbConnector.close();
}
And when I try to get the value as:
String idcasa = casaSpinner.getSelectedItem().toString();
it only returns this:
android.database.sqlite.SQLiteCursor#40539880
Your spinner has taken a SimpleCursorAdapter as an adapter, of which its dataset is a Cursor. When you select an item on the spinner, you've only moved the cursor to a specific row and when you call getSelectedItem() you're still requesting for the dataset object - which is still a cursor object. to do what you're trying you can simply call:
c.getString(1);
once your selection has been made. For something a little more fundamentary illustrative of what i said.
((Cursor) casaSpinner.getSelectedItem()).getString(1);

listview shows only one value in one block

i have a listview and its data values is separated by blocks( Item1, Item2...) but i want to know how to show (Item 1, Sub Item 1...) ?
well here is the code that shows only the Item, so how do i show the Item and the Sub Item?
code:
//LISTVIEW database CONTATO
ListView user = (ListView) findViewById(R.id.lvShowContatos);
//String = simple value ||| String[] = multiple values/columns
String[] campos = new String[] {"nome", "telefone"};
list = new ArrayList<String>();
Cursor c = db.query( "contatos", campos, null, null, null, null, "nome" + " ASC ");
c.moveToFirst();
String lista = "";
if(c.getCount() > 0) {
while(true) {
list.add(c.getString(c.getColumnIndex("nome")).toString());
if(!c.moveToNext()) break;
}
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
user.setAdapter(adapter);
the code i putted there but still gives me errors and i dont see where it gets the values from yet.
//LISTVIEW database CONTATO
ListView user = (ListView) findViewById(R.id.lvShowContatos);
//String = simple value ||| String[] = multiple values/columns
String[] campos = new String[] {"nome", "telefone"};
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> listItem;
Cursor c = db.query( "contatos", campos, null, null, null, null, "nome" + " ASC ");
c.moveToFirst();
listItem = new HashMap<String, Object>();
listItem.put("nome", "your_item_text");
listItem.put("telefone", "your_subitem_text");
items.add(listItem);
adapter = new SimpleAdapter(this, items, R.layout.custom_list_layout, new String[]{"item", "subitem"}, new int[]{R.id.text_item, R.id.text_subitem});
user.setAdapter(adapter);
Use SimpleAdapter, not the ArrayAdapter to populate the ListView: http://developer.android.com/reference/android/widget/SimpleAdapter.html
There you will have an array of fields to populate for each item, like:
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> listItem;
listItem = new HashMap<String, Object>();
listItem.put("item", "your_item_text");
listItem.put("subitem", "your_subitem_text");
items.add(listItem);
adapter = new SimpleAdapter(this, items, R.layout.custom_list_layout, new String[]{"item", "subitem"}, new int[]{R.id.text_item, R.id.text_subitem});
listview.setAdapter(adapter);
Remember also to create custom_list_layout.xml for your ListView items, and make sure it contains textViews with proper ids:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/text_item"
... />
<TextView
android:id="#+id/text_subitem"
... />
</RelativeLayout>
Look at ExpandableListView, that is exactly for this user case.
You will have to create your own custom adapter extending either the ArrayAdapter or the BaseAdapter and you will also have to create an xml layout for your items in the list.
If you are new to ListView go through this tutorial on ListView.

Android Binding SQLite to GridView in Eclipse

I have made the following code to retrive data from SQLite database.
public Cursor fetchAllScores() {
return database.query(DATABASE_TABLE, new String[] { KEY_ROWID,
KEY_PLAYDATE, KEY_NUMVALA, KEY_NUMVALB }, null, null, null,
null, null);
}
Then I call this function in my main.java file using the following
cursor = dbHelper.fetchAllScores();
startManagingCursor(cursor);
After having cursor I manage to populate myGridView with some data using following code
GridView myGV = (GridView)findViewById(R.id.gridView1);
String[] cols = new String[] { scoreDbAdapter.KEY_PLAYDATE, scoreDbAdapter.KEY_NUMVALA, scoreDbAdapter.KEY_NUMVALB};
int[] views = new int[] { android.R.id.text1, android.R.id.text2, android.R.id.text2 };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, cursor, cols, views);
Log.w("NumRows",adapter.getCount() + "");
myGV.setAdapter(adapter);
Now the problem is only first row is populated and first two columns, I want data like in forst row (2011-10-27 , 5 , 6 ) and second row like (2011-10-26 , 3 , 2 ) but i m getting is only forst row like (2011-10-27, 2011-10-26 ).
Can this be fixed in GridView?
For your question, take a look here, Binding to Data with AdapterView.
Note: Below decription is just example for how to bind cursor to an adapter.
Filling the Layout with Data
Inserting data into the layout is typically done by binding the AdapterView class to an Adapter, which retrieves data from an external source (perhaps a list that the code supplies or query results from the device's database).
The following code sample does the following:
1.Creates a Spinner with an existing View and binds it to a new ArrayAdapter that reads an array of colors from the local resources.
2.Creates another Spinner object from a View and binds it to a new SimpleCursorAdapter that will read people's names from the device contacts (see Contacts.People).
// Get a Spinner and bind it to an ArrayAdapter that
// references a String array.
Spinner s1 = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.colors,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s1.setAdapter(adapter);
// Load a Spinner and bind it to a data query.
private static String[] PROJECTION = new String[] { People._ID, People.NAME};
Spinner s2 = (Spinner) findViewById(R.id.spinner2);
Cursor cur = managedQuery(People.CONTENT_URI, PROJECTION, null, null);
SimpleCursorAdapter adapter2 = new SimpleCursorAdapter(this,android.R.layout.simple_spinner_item,cur,new String[] {People.NAME}, new int[] {android.R.id.text1});
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s2.setAdapter(adapter2);
Note that it is necessary to have the People._ID column in projection used with CursorAdapter or else you will get an exception.
If, during the course of your application's life, you change the underlying data that is read by your Adapter, you should call notifyDataSetChanged(). This will notify the attached View that the data has been changed and it should refresh itself.
For more info look at this,
Custom CursorAdapters.
Thanks.
Make a new layout which contains textViews. Find the layout as shown in first line of the code below and attach your data to the listView. ListView loads the layout containing textView.
private void populateGrid()
{
ListView lv = (ListView)findViewById(R.id.listView1);
Cursor c = dbHelper.fetchAllScores();
startManagingCursor(cursor);
String[] cols = new String[] { TodoDbAdapter.KEY_PLAYDATE, TodoDbAdapter.KEY_NUMVALA, TodoDbAdapter.KEY_NUMVALB};
int[] views = new int[] { R.id.txt_date, R.id.txt_no, R.id.txt_yes};
// Now create an array adapter and set it to display using our row
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.listviewtemp, c, cols, views);
Log.w("NumRows",adapter.getCount() + "");
lv.setAdapter(adapter);
}
R.layout.listviewtemp is the listView template layout (separate xml), lv is the listview found in the mainlayout.xml.
public Cursor fetchAllScores() {
return database.query(DATABASE_TABLE, new String[] { KEY_ROWID,
KEY_PLAYDATE, KEY_NUMVALA, KEY_NUMVALB }, null, null, null,
null, null);
}

Custom IDs in ListView

I'm trying to populate a listview with products. I can do it, but I need them to have custom id's (the ones from the SQLite database). How can I do this? This is my code without the id implementation so far:
ArrayList<String> productNameList = new ArrayList<String>();
ArrayList<String> productIdList = new ArrayList<String>();
Cursor results = myDbHelper.getProducts();
ListView lv = (ListView) findViewById(R.id.productlist);
while (results.moveToNext()){
productNameList.add(results.getString(results.getColumnIndex("name")));
productIdList.add(results.getString(results.getColumnIndex("id")));
}
lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , productNameList));
You should use a SimpleCursorAdapter:
String[] columns = new String[] { "_id", "name" };
int[] to = new int[] { android.R.id.text1, android.R.id.text2 };
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, cursor, columns, to);
lv.setAdapter(mAdapter));
"to" and "columns" define a mapping:
"colums" is a list of the database column names you want the SimpleCursorAdapter to read. And "to" is a list of android ids specifying on which widget the values from the cursor are set.
In the latter code this means that the value of "_id" will be displayed in the textfield with the android id "android.R.id.text1" and the value of the column "name" will go into textfield "android.R.id.text2".

ArrayAdapter/ListView is not working

I'm new programming with android, and doing my first aplication i got something wrong with the lists.
Here the code:
Cursor c = db.rawQuery("SELECT nombre FROM contactos", null);
ArrayList<String> listaArray = new ArrayList<String>();
ListView listadoContactos = (ListView)findViewById(R.id.listViewListaContactos);
if (c.moveToFirst())
{
do {
listaArray.add(c.getString(0));
} while(c.moveToNext());
}
//Creamos un adaptador y lo asignamos al ListView.
ArrayAdapter<String> adaptadorLista = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listaArray);
listadoContactos.setAdapter(adaptadorLista);
When i see the result, my list its showing only the first item in the db that i'm querying. Can you help me, please?
Thanks in advice! George.
PS: "nombre" is the column 0. That is why i'm writting "getString(0)", because i just want to show 1 column of each row.
Try to use SimpleCursorAdapter
// NOTE your query result should have id-field, named "_id"
Cursor c = db.rawQuery("SELECT nombre, nombre_id as _id FROM contactos", null);
SimpleCursorAdapter adaptorLista = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, c, new String[]{"nombre"}, new int[]{android.R.id.text1} );
listadoContactos.setAdapter(adaptadorLista);
Here android.R.layout.simple_list_item_1 is a layout of each row in ListView,
new String[]{"nombre"} names of fields in cursor which values are set to TextViews in ListView row. TextView ids specified in the last argument new int[]{android.R.id.text1}
Use a CursorAdapter instead of an ArrayListAdapter. You are making extra work for yourself by copying the cursor into an Array just to feed it to the ListView.
Here is a tutorial on CursorAdapters
You could use a SimpleCursorAdapter and pass it the cursor directly:
Adapter adapter = new SimpleCursorAdapter(
this,
c,
android.R.layout.simple_list_item_1,
new String[] { "nombre" },
new int[] { android.R.id.text1 },
0);
listadoContactos.setAdapter(adapter);
and then you don't have to step through and build the list yourself.

Categories

Resources