Android advanced 2 gallery Infinite Loop

Before that, I have published a regular Gallery. If you have not learned this before, you can view the blog: The Gallery of the android learning notes.

This article details what gallery is and how to use it. This document does not need to be discussed here. It mainly describes the loop usage of gallery.

The reuse of gallery is actually very simple. I can search a lot on the Internet, but I still want to write it. One is to record your learning achievements, and the other is to share with you.

The implementation of the gallery loop mainly involves inheriting the imageadapter of the baseadapter.

// Obtain the number of images public int getcount () {return integer. max_value ;}

Public View getview (INT position, view convertview, viewgroup parent) {imageview = new imageview (context); // set the imageview resource for imageview. setimageresource (image [position % image. length]); // sets the display ratio type imageview. setscaletype (imageview. scaletype. fit_xy); // set the layout image to 120 * 80imageview. setlayoutparams (new gallery. layoutparams (60, 60); Return imageview ;}

Compared with previous articles, you will find that there are two changes: one is that the getcount () method returns the maximum integer value instead of the number of images;

The other part is imageview. setimageresource (image [position % image. Length]);

The gallery component is displayed to the last image, and the position parameter value is exactly getcount ()-1.

To achieve a loop, a large number must be returned, that is, the click can always go down, and the remainder of the position can achieve the loop 0, 1 of the image, 2 ............ image. length ()-, 1, 2 .............

Specific implementation:

Package xiaosi. loopgallery; import android. app. activity; import android. content. context; import android. OS. bundle; import android. view. view; import android. view. viewgroup; import android. widget. adapterview; import android. widget. adapterview. onitemselectedlistener; import android. widget. baseadapter; import android. widget. gallery; import android. widget. imageview; public class loopgalleryactivity extends activit Y {private gallery Gallery; private int [] image = new int [] {R. drawable. a, R. drawable. b, R. drawable. c, R. drawable. d, R. drawable. e, R. drawable. f, R. drawable. g, R. drawable. h, R. drawable. i, R. drawable. j ,}; public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); gallery = (Gallery) findviewbyid (R. id. gallery); Gallery. setadapter (New imageadapter (thi S); gallery. setspacing (1); gallery. setselection (4); gallery. setonitemselectedlistener (New onitemselectedlistener () {public void onitemselected (adapterview <?> Arg0, view arg1, int arg2, long arg3) {} public void onnothingselected (adapterview <?> Arg0) {}});} class imageadapter extends baseadapter {private context; Public imageadapter (context c) {context = C ;}// obtain the number of images public int getcount () {return integer. max_value;} // obtain the position of the image in the library public object getitem (INT position) {return position;} // obtain the image idpublic long getitemid (INT position) {return position ;} public View getview (INT position, view convertview, viewgroup parent) {imageview = new imageview (context); // set the imageview resource for imageview. setimageresource (image [position % image. length]); // sets the display ratio type imageview. setscaletype (imageview. scaletype. fit_xy); // set the layout image to 120 * 80imageview. setlayoutparams (new gallery. layoutparams (60, 60); Return imageview ;}}}

Main. xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Gallery        android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginTop="30dp"         android:background="?android:galleryItemBackground"/></LinearLayout>

Let's witness the departure of cainiao ......