android--List view (ListView)

List view is the most commonly used view component in Android, which lists the list items that need to be displayed in a vertical list. There are two ways to add a list view to the screen in Android: one is created directly using the ListView component, and the other is to have the activity inherit the listactivity implementation. These two methods are described below:

First, directly using the ListView component to create

Add a listview to the layout file first

The code is as follows:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"Xmlns:tools="Http://schemas.android.com/tools"Android:id="@+id/linearlayout1"Android:layout_width="match_parent"Android:layout_height="match_parent"android:orientation="Vertical"Tools:context=". Mainactivity"> <ListView Android:id="@+id/listview1"Android:layout_width="match_parent"Android:layout_height="wrap_content"android:entries="@array/cytpe"> </ListView></LinearLayout>

An array resource named CType is used here, so we want to create an XML file Arrays.xml code for a defined array resource in the Res/values directory as follows:

<?xml version= "1.0" encoding= "UTF-8"?>    <resources>        <string-array name= "Cytpe" >        < Item> profile </item>        <item> theme Modes </item>        <item> mobile </item>        <item> Program Management </item>        <item> call settings </item>        <item> connectivity </item>        </string-array >     </resources>

You can see the list view as shown below by running directly:

The following is an adapter to specify list items to create a ListView

Layout code:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:id=" @+id/linearlayout1 "    android:layout_width=" Match_parent    " android:layout_height= "Match_parent"    android:orientation= "vertical"    tools:context= ". Mainactivity ">    <listview        android:id=" @+id/listview1 "        android:layout_width=" Match_parent "        android:layout_height= "wrap_content"        android:divider= "@drawable/ic_launcher"        android: dividerheight= "3px"        android:footerdividersenabled= "false"        android:headerdividersenabled= "false"        >    </ListView></LinearLayout>

Java code:

Package Com.basillee.blogdemo;import Java.lang.annotation.retention;import Java.util.list;import android.os.Bundle ; Import Android.app.activity;import android.view.menu;import android.view.view;import Android.widget.AdapterView; Import Android.widget.adapterview.onitemclicklistener;import Android.widget.arrayadapter;import Android.widget.linearlayout;import Android.widget.listview;import Android.widget.toast;public class MainActivity Extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); ListView listview= (ListView) Findviewbyid (R.id.listview1); Arrayadapter<charsequence>adapter=arrayadapter.createfromresource (this,r.array.cytpe,android. R.layout.simple_list_item_single_choice); Listview.setadapter (adapter); Listview.setonitemclicklistener (new Onitemclicklistener () {@Overridepublic void Onitemclick (adapterview<?> parent, View arg1, int pos,long id) {String Result=parent.getitematpositIon (POS). toString (); Toast.maketext (Getapplicationcontext (), result, Toast.length_long). Show ();}});}}

Second, let the activity inherit listactivity realization:

If the program's window simply needs to display a list, it can be implemented directly with the activity inheriting listactivity. Instead of calling the Setcontentview method to display the page in a class that inherits Listactivity, you can set the adapter directly for it to display a list.

Just look at the code, and everyone knows it:

Package Com.basillee.blogdemo;import Java.lang.annotation.retention;import Java.util.list;import android.os.Bundle ; Import Android.app.activity;import android.app.listactivity;import android.view.menu;import Android.view.View; Import Android.widget.adapterview;import Android.widget.adapterview.onitemclicklistener;import Android.widget.arrayadapter;import Android.widget.linearlayout;import Android.widget.listview;import Android.widget.toast;public class Mainactivity extends listactivity{@Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); String []cytpestrings=new string[]{"situational Mode", "Theme Mode", "Phone", "Program Management"}; Arrayadapter<string>adapter=new arrayadapter<string> (this, Android. r.layout.simple_list_item_single_choice,cytpestrings); Setlistadapter (adapter);} @Overrideprotected void Onlistitemclick (ListView l, View v, int position, long ID) {//TODO auto-generated method Stubsupe R.onlistitemclick (l, V, position, id); String Resultstring=l.getitematposItion (position). ToString (); Toast.maketext (Getapplicationcontext (), resultstring, Toast.length_long). Show ();}}

　　

android--List view (ListView)