Common usage of Android ListView (ii)

The ListView is a frequently used control, and each subkey inside the ListView item can make a string, or it can be a combined control. Let's talk about the ListView implementation:

1. Prepare the data for the ListView to be displayed ;

2. Using one-dimensional or multidimensional dynamic array save data;

2. Build adapter , < Span style= "font-size:medium;" To put it simply, adapter is Span style= "color: #008080;" >item array How many items are generated ;

3. Add the Adapter to the ListView and display it.

Next, you start the XML code for the UI:

The Main.xml code is as follows :

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutAndroid:id= "@+id/linearlayout01"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"xmlns:android= "Http://schemas.android.com/apk/res/android">                <ListViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:id= "@+id/mylistview">        </ListView></LinearLayout>

The code for My_listitem.xml is as follows, My_listitem.xml is used to design the ListView item:

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutAndroid:layout_width= "Fill_parent"xmlns:android= "Http://schemas.android.com/apk/res/android"android:orientation= "vertical"Android:layout_height= "Wrap_content"Android:id= "@+id/mylistitem"Android:paddingbottom= "3dip"Android:paddingleft= "10dip">        <TextViewAndroid:layout_height= "Wrap_content"Android:layout_width= "Fill_parent"Android:id= "@+id/itemtitle"android:textsize= "30dip">        </TextView>        <TextViewAndroid:layout_height= "Wrap_content"Android:layout_width= "Fill_parent"Android:id= "@+id/itemtext">        </TextView></LinearLayout>

Explain some of the properties that are used inside:

1.paddingbottom= "3dip", layout set aside 3 pixels of blank space at the bottom

2.paddingleft= "10dip", layout to left a blank area of 10 pixels

3.textsize= "30dip", TextView's font size is 30 pixels.

The last is the Java source code:

     Public voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.main); //The listview in the binding XML, as the container for itemListView list =(ListView) Findviewbyid (R.id.mylistview); //generate dynamic arrays, and reprint dataarraylistNewArraylist();  for(inti=0;i<30;i++) {HashMap<string, string> map =NewHashmap<string, string>(); Map.put ("Itemtitle", "This is the Title ..."); Map.put ("Itemtext", "This is text ...");        Mylist.add (map); }        //build Adapter, array = = = "ListItemSimpleadapter Mschedule =NewSimpleadapter ( This,//nothing to explain .MyList//Data SourcesR.layout.my_listitem,//XML implementation of ListItem //the children of the dynamic array corresponding to the ListItem                                                    NewString[] {"Itemtitle", "Itemtext"},                                                                                                         //two TextView IDs in the ListItem XML file                                                    New int[] {r.id.itemtitle,r.id.itemtext}); //Add and showList.setadapter (Mschedule); }

Common usage of Android ListView (ii)