The ListView for Android Control development
This article mainly describes the use of the ListView control in Android development.
Java code:
Package Com.example.listview;
Import java.util.ArrayList;
Import Java.util.HashMap;
Import android.app.ListActivity;
Import Android.os.Bundle;
Import Android.view.Menu;
Import Android.view.View;
Import Android.widget.ListView;
Import Android.widget.SimpleAdapter;
public class Mainactivity extends Listactivity {
@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
Declares a list, and the cells in the list are map
arraylist
Declares a map, and the element in the map is a string key-value pair
hashmap<string, string> map1 = new hashmap<string, string> ();
hashmap<string, string> map2 = new hashmap<string, string> ();
hashmap<string, string> map3 = new hashmap<string, string> ();
Put key value pair data to map
Map1.put ("name", "Zhangsan");
Map1.put ("IP", "192.168.1.1");
Map2.put ("name", "Lisi");
Map2.put ("IP", "192.168.1.2");
Map3.put ("name", "Wangwu");
Map3.put ("IP", "192.168.1.3");
To add a map to the list
List.add (MAP1);
List.add (MAP2);
List.add (MAP3);
Build Adapter Adapter
Simpleadapter listadapter = new Simpleadapter (this, list,
R.layout.user, new string[]{"name", "IP"},
New Int[]{r.id.name,r.id.ip});
Setlistadapter (ListAdapter);
}
Binds a listener to the list, and when a cell in the list is pressed, the function
@Override
protected void Onlistitemclick (ListView l, View v, int position, long ID) {
TODO auto-generated Method Stub
Super.onlistitemclick (l, V, position, id);
SYSTEM.OUT.PRINTLN ("id =" + ID);
System.out.println ("position =" + position);
}
@Override
public boolean Oncreateoptionsmenu (Menu menu) {
Inflate the menu; This adds items to the action bar if it is present.
Getmenuinflater (). Inflate (R.menu.main, menu);
return true;
}
}
main layout file Mail.xml 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"
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= ". Mainactivity ">
<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:text= "@string/hello_world"/>
<linearlayout
Android:id= "@+id/listlinearlayout"
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
android:orientation= "Vertical"
>
<listview
Android:id= "@id/android:list"
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
Android:drawselectorontop= "false"
android:scrollbars= "Vertical" ></ListView>
</LinearLayout>
</LinearLayout>
User.xml Code implementation:
<?xml version= "1.0" encoding= "Utf-8"?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Xmlns:tools= "Http://schemas.android.com/tools"
Android:id= "@+id/maplinear"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
android:orientation= "Horizontal"
Tools:ignore= "Uselessparent" >
<textview
Android:id= "@+id/name"
Android:layout_width= "180dip"
android:layout_height= "30dip"
Android:textsize= "20dip"
android:gravity= "Center_vertical"/>
<textview
Android:id= "@+id/ip"
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
Android:textsize= "20dip"/>
</LinearLayout>
The
implementation results are as follows:
Clicking on the list of related lists will output the relevant list information in Logcat as follows:
The ListView for Android Control development
