Android getting started tutorial (18)-listview (2 ))

This article from http://blog.csdn.net/hellogv/

 

Listview is a commonly used control. Each item in the listview can be a string or a combination control. First, let's talk about the implementation of listview:

1. PrepareData ;

2. with one-dimensional or multi-dimensional dynamic array save data.

2. build adapter , in simple terms, the adapter is item array , dynamic array each element generates multiple items.

3. Adapter Add to listview and display it.

Next, let's take a look at this articleCodeImplemented listview:

 

Next, we will start the XML code of the UI:

The main. XML Code is as follows:

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2. <?XML Version="1.0" Encoding="UTF-8"?>
4. <Linearlayout
6. Android: ID="@ + ID/linearlayout01"
8. Android: layout_width="Fill_parent"
10. Android: layout_height="Fill_parent"
12. Xmlns: Android=Http://schemas.android.com/apk/res/android">
16. <Listview Android: layout_width="Wrap_content"
18. Android: layout_height="Wrap_content"
20. Android: ID="@ + ID/mylistview">
22. </Listview>
24. </Linearlayout>

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout <br/> Android: Id = "@ + ID/linearlayout01" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> xmlns: Android = "http://schemas.android.com/apk/res/android"> </P> <p> <listview Android: layout_width = "wrap_content" <br/> Android: layout_height = "wrap_content" <br/> Android: id = "@ + ID/mylistview"> <br/> </listview> <br/> </linearlayout> <br/>

 

 

The code for my_listitem.xml is as follows. my_listitem.xml is used to design the items of listview:

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2. <?XML Version="1.0" Encoding="UTF-8"?>
4. <Linearlayout
6. Android: layout_width="Fill_parent"
8. Xmlns: Android=Http://schemas.android.com/apk/res/android"
10. Android: Orientation="Vertical"
12. Android: layout_height="Wrap_content"
14. Android: ID="@ + ID/mylistitem"
16. Android: paddingbottom="3dip"
18. Android: paddingleft="10dip">
20. <Textview
22. Android: layout_height="Wrap_content"
24. Android: layout_width="Fill_parent"
26. Android: ID="@ + ID/itemtitle"
28. Android: textsize="30dip">
30. </Textview>
32. <Textview
34. Android: layout_height="Wrap_content"
36. Android: layout_width="Fill_parent"
38. Android: ID="@ + ID/itemtext">
40. </Textview>
42. </Linearlayout>

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout <br/> Android: layout_width = "fill_parent" <br/> xmns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: orientation = "vertical" <br/> Android: layout_height = "wrap_content" <br/> Android: Id = "@ + ID/mylistitem" <br/> Android: paddingbottom = "3dip" <br/> Android: paddingleft = "10dip"> <br/> <textview <br/> Android: layout_height = "wrap_content" <br/> Android: layout_width = "fill_parent" <br/> Android: Id = "@ + ID/itemtitle" <br/> Android: textsize = "30dip"> <br/> </textview> <br/> <textview <br/> Android: layout_height = "wrap_content" <br/> Android: layout_width = "fill_parent" <br/> Android: id = "@ + ID/itemtext"> <br/> </textview> <br/> </linearlayout> <br/>

 

Here are some of the attributes used:

1. paddingbottom = "3dip", layout leaves 3 pixels of blank area at the bottom

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

3. textsize = "30dip", textview font is as large as 30 pixels.

 

Finally, JavaSource code:

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2. Public VoidOncreate (bundle savedinstancestate ){
4. Super. Oncreate (savedinstancestate );
6. Setcontentview (R. layout. Main );
8. // Bind the listview in XML as the item container
10. Listview list = (listview) findviewbyid (R. Id. mylistview );
14. // Generate a dynamic array and reload the data
16. Arraylist NewArraylist
18. For(IntI =0; I <30; I ++)
20. {
22. Hashmap <string, string> map =NewHashmap <string, string> ();
24. Map. Put ("Itemtitle","This is title .....");
26. Map. Put ("Itemtext","This is text .....");
28. Mylist. Add (MAP );
30. }
32. // Generate the adapter, array ===" listitem
34. Simpleadapter mschedule =NewSimpleadapter (This,// No explanation
36. Mylist,// Data Source
38. R. layout. my_listitem,// XML Implementation of listitem
42. // Subitem of the dynamic array and listitem
44. NewString [] {"Itemtitle","Itemtext"},
48. // Two textview IDs in the XML file of listitem
50. New Int[] {R. Id. itemtitle, R. Id. itemtext });
52. // Add and display
54. List. setadapter (mschedule );
56. }