Android getting started tutorial (23) -- Gallery)

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The gallery control of Android is a Good Graph Display Control, which greatly reduces developers' development of the Image view function and provides a more elegant effect. This article introduces the usage of gallery and uses the reflection mechanism to dynamically read images from resources.

In this article:

 

Main. xml source code:

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2. <?XML Version="1.0" Encoding="UTF-8"?>
4. <Linearlayout Xmlns: Android=Http://schemas.android.com/apk/res/android"
6. Android: Orientation="Vertical"
8. Android: layout_width="Fill_parent"
10. Android: layout_height="Fill_parent"
12. >
14. <Gallery Android: ID="@ + ID/Gallery" Android: layout_height="Fill_parent" Android: layout_width="Fill_parent"></Gallery>
16. </Linearlayout>

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: Orientation = "vertical" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> <gallery Android: Id = "@ + ID/Gallery" Android: layout_height = "fill_parent" Android: layout_width = "fill_parent"> </gallery> <br/> </linearlayout> <br/>

 

 

ProgramSource code:

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2. PackageCom. testimageview;
6. ImportJava. Lang. Reflect. field;
8. ImportJava. util. arraylist;
12. ImportAndroid. App. activity;
14. ImportAndroid. content. context;
16. ImportAndroid. Graphics. Bitmap;
18. ImportAndroid. Graphics. bitmapfactory;
20. ImportAndroid. OS. Bundle;
22. ImportAndroid. View. view;
24. ImportAndroid. View. viewgroup;
26. ImportAndroid. widget. adapterview;
28. ImportAndroid. widget. baseadapter;
30. ImportAndroid. widget. Gallery;
32. ImportAndroid. widget. imageview;
34. ImportAndroid. widget. adapterview. onitemclicklistener;
38. Public ClassTestimageviewExtendsActivity {
40. PrivateGallery mgallery;
42. @ Override
44. Public VoidOncreate (bundle savedinstancestate ){
46. Super. Oncreate (savedinstancestate );
48. Setcontentview (R. layout. Main );
52. Mgallery = (Gallery) findviewbyid (R. Id. Gallery );
54. Try{
56. Mgallery. setadapter (NewImageadapter (This));
58. }Catch(Illegalargumentexception e ){
60. // Todo auto-generated Catch Block
62. E. printstacktrace ();
64. }Catch(Illegalaccessexception e ){
66. // Todo auto-generated Catch Block
68. E. printstacktrace ();
70. }
72. Mgallery. setonitemclicklistener (NewOnitemclicklistener (){
74. Public VoidOnitemclick (adapterview parent, view V,IntPosition,LongID ){
76. Testimageview.This. Settitle (string. valueof (position ));
78. }
80. });
82. }
86. /* 
88. * Class imageadapter is used to control gallery source and operation. 
90. */
92. Private ClassImageadapterExtendsBaseadapter {
94. PrivateContext mcontext;
96. PrivateArraylist <integer> imglist =NewArraylist <integer> ();
98. PrivateArraylist <Object> imgsizes =NewArraylist <Object> ();
100. PublicImageadapter (context c)ThrowsIllegalargumentexception, illegalaccessexception {
102. Mcontext = C;
106. // Use the reflection mechanism to obtain the image ID and size in the Resource
108. Field [] fields = R. drawable.Class. Getdeclaredfields ();
110. For(Field: fields)
112. {
114. If(!"Icon". Equals (field. getname ()))// Images except icons
116. {
118. IntIndex = field. getint (R. drawable.Class);
120. // Save the image ID
122. Imglist. Add (INDEX );
124. // Save the image size
126. IntSize [] =New Int[2];
128. Bitmap bmimg = bitmapfactory. decoderesource (getresources (), index );
130. Size [0] = Bmimg. getwidth (); Size [1] = Bmimg. getheight ();
132. Imgsizes. Add (size );
134. }
136. }
138. }
140. @ Override
142. Public IntGetcount (){
144. // Todo auto-generated method stub
148. ReturnImglist. Size ();
150. }
154. @ Override
156. PublicObject getitem (IntPosition ){
158. // Todo auto-generated method stub
162. ReturnPosition;
164. }
168. @ Override
170. Public LongGetitemid (IntPosition ){
172. // Todo auto-generated method stub
176. ReturnPosition;
178. }
182. @ Override
184. PublicView getview (IntPosition, view convertview, viewgroup parent ){
186. // Todo auto-generated method stub
190. Imageview I =NewImageview (mcontext );
192. // Obtain the image ID from imglist
194. I. setimageresource (imglist. Get (position). intvalue ());
196. I. setscaletype (imageview. scaletype. fit_xy );
198. // Obtain the image size from imgsizes
200. IntSize [] =New Int[2];
202. Size = (Int[]) Imgsizes. Get (position );
204. I. setlayoutparams (NewGallery. layoutparams (size [0], Size [1]);
206. ReturnI;
208. }
212. };
214. }