Android Road Gallery Gallery

Gallery is an internal element that scrolls horizontally, and is able to position the currently selected child element in its center layout component.

Let's take a look at the execution effect of the sample directly.

1. Xinjiang project hellogallery

2. Put the pictures that need to be displayed in res/drawable folder. Woman01.jpg. Woman02.jpg,woman03.jpg

3.res/layout/activity_main.xml file such as the following:

<framelayout  xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    android:id= "@+id/framelayout01"   ><imageview android:layout_width= "Match_parent"    android: layout_height= "Match_parent"    android:id= "@+id/imageview01"    android:src= "@drawable/woman01"/>< Gallery android:layout_width= "match_parent"    android:layout_height= "wrap_content" android:id= "@+id/    Gallery01 "    android:spacing=" 5DP "/></framelayout >

We use framelayout to achieve overlay effects and use ImageView to display large images. Gallery to show the gallery, the android:spacing= "5DP" property is used to set the interval between elements.

4. Create a new attrs.xml content in the res/values/folder such as the following:

<?xml version= "1.0" encoding= "Utf-8"?><resources> <declare-styleable   name= "Hellogallery" >         <attr name= "Android:galleryitembackground" >        </attr>   </declare-styleable></ Resources>

5. The code for the main activity,mainactivity is as follows:

<pre name= "code" class= "java" >package com.howlaa.hellogallery;import Android.os.bundle;import Android.app.activity;import Android.view.menu;import Android.view.view;import Android.view.ViewGroup;import Android.widget.adapterview;import Android.widget.adapterview.onitemclicklistener;import Android.widget.baseadapter;import Android.widget.gallery;import Android.widget.imageview;import Android.widget.toast;public class Mainactivity extends Activity {@Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); final ImageView IV = (ImageView) Findviewbyid (R.ID.IMAGEVIEW01);        Gallery g = (Gallery) Findviewbyid (R.ID.GALLERY01);//Set Picture match G.setadapter (new Imageadapter (this)); Set Adapterview click Listener, Gallery is the subclass of Adapterview G.setonitemclicklistener (new Onitemclicklistener () {@Overri De public void Onitemclick (adapterview<?> parent, view view, int pOsition, long ID) {//Display Click is the number of pictures Toast.maketext (Mainactivity.this, "" + position,                    Toast.length_long). Show ();            Setting the ImageView of the background section displays the picture of the current item Iv.setimageresource ((ImageView) view). GetId ()); }    });} }

The code for 6.ImageAdapter is as follows:

Package Com.howlaa.hellogallery;import Android.content.context;import Android.content.res.typedarray;import Android.view.view;import Android.view.viewgroup;import Android.widget.baseadapter;import android.widget.Gallery; Import Android.widget.imageview;import Android.widget.spinneradapter;public class Imageadapter extends BaseAdapter {/    /item-Modified background int mgalleryitembackground;    Context object private context Mcontext;  Image array Private integer[] Mimageids ={r.drawable.woman01,r.drawable.woman02,r.drawable.woman03};    Construction method Public Imageadapter (Context c) {mcontext = C;    Read Styleable resource TypedArray a = Mcontext.obtainstyledattributes (r.styleable.hellogallery);    Mgalleryitembackground = A.getresourceid (r.styleable.hellogallery_android_galleryitembackground, 0);    A.recycle (); } @Overridepublic int GetCount () {return mimageids.length;} @Overridepublic Object getItem (int position) {return position;} @Overridepublic long Getitemid (int position) {REturn position;} @Overridepublic view GetView (int position, view Convertview, ViewGroup parent) {ImageView IV = new ImageView (mcontext); Iv.  Setimageresource (Mimageids[position]);        Set the ID for the generated ImageView, not set the ID is -1 iv.setid (mimageids[position]);        Iv.setlayoutparams (New Gallery.layoutparams (120, 160));        Iv.setscaletype (ImageView.ScaleType.FIT_XY); Iv.setbackgroundresource (Mgalleryitembackground); return IV;}}

Android Road Gallery Gallery