Android listview is a group view
that displays a list of scrollable items. A simple example is phone Contact
book, where you have a list of your contacts displayed in a listview.
To use a listview in android, drag
and drop the listview control from the pallet to your user interface (UI).
LISTITEM.
List items are individual rows in
a listview where data for each individual item is displayed. For example in the
phone contact book mentioned earlier, each person’s contact details (could be
their photo, number, name & email) are displayed in a single row (list
item).
ADAPTER:-
Acts as the bridge between the
view (e.g. Listview or gridview) and the underlying data for the view.
It just manages the adapter with
the data and adapts the data to the individual rows (list item) of the view.
-
setAdapter() method is used to bind the adapter
with the listview.
Some common adapters
provided by android include:-
a.
Simple cursor adapter.
b.
Array adapter.
c.
Cursor adapter.
But for the most part you would like to make your own
adapter, and to do that you extent BaseAdapter.
Alright, enough basics let’s try a simple listview
application now using Arrayadapter.
-
This kind of adapter is mostly used if you have
a list of single items backed by an array. e.g. List of fruits names, list of
cities, list of planets etc.
Let’s create a string array of
fruits;
String [] fruits= new String[] {“Orange”,”Apple”,”Mangoes”,”pineapple”,”Bananas”};
// this is our source data.
Next is to create the
arrayadapater;
ArrayAdapter<String>
fruitAdapter= new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, fruits);
fruitAdapter is an object of
ArrayAdapter.
The parameters include:-
a.
Context… this
b.
Layout , which the adapter will use to bind the
data from fruit array ; here we use _simple_list_item_1, displays a simple text
view(you can use simple_list_item_multiple_choice to add check box after each textview)
c.
The 3rd is the data ……. fruits.
The last thing is to reference our
listview and bind it to our adapter.
ListView fruitList=
(ListView)findViewById(R.id.lst);
fruitList.setAdapter(fruitAdapter);
Here is the code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SharedPrefActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
package com.example.listviewtutorial;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class ListViewActivity extends Activity {
ListView fruitList;
String[]fruits= new String[]{"orange","apple","Bananas","Mangoes","Carrots","Tomatoes","onions","potatoes",};// make it longer if you wish
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
ArrayAdapter<String> fruitsAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,fruits);
fruitList=(ListView)findViewById(R.id.listView1);
fruitList.setAdapter(fruitsAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.shared_pref, menu);
return true;
}
}
