5th Chapter (8) Photo Gallery (Galery)

Category: C #, Android, VS2015;

Date Created: 2016-02-07 I. INTRODUCTION

Gallery (also called gallery) is a layout widget that displays each picture in a horizontally scrollable list, and the currently selected picture is placed in the center of the view.

Note: Android has deprecated this widget, and the reason for deprecation is that it is less efficient with galery, and the official recommendation is instead to replace the widget with Horizontalscrollview. However, many of the picture-browsing features on your phone are now implemented with galery, and if you still like the widget, you can continue to use it in a high-build project. Second, example 8--demo08gallery

1. Operation

Use the mouse to drag and drop pictures in the simulator to observe the effect.

2. Add Demo08gallery.axml File

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"android:orientation= "vertical"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:gravity= "Center_vertical">    <GalleryAndroid:id= "@+id/gallery"Android:layout_width= "Fill_parent"Android:layout_height= "Wrap_content" /></LinearLayout>

Save the file, and then click the Refresh button above Solution Explorer.

3. Add Demo08Gallery.cs File

usingSystem;usingAndroid.app;usingandroid.content;usingAndroid.os;usingandroid.views;usingAndroid.widget;usingJava.lang;namespaceCh05demos. srcactivity{[Activity (Label="Demo08actionbar")]     Public classdemo08gallery:activity {protected Override voidOnCreate (Bundle savedinstancestate) {Base.            OnCreate (savedinstancestate);            Setcontentview (Resource.Layout.demo08_Gallery); varg = findviewbyid<gallery>(Resource.Id.gallery); G.adapter=NewImageadapter ( This) {Currentwidth=550, Currentheight=550            }; G.itemclick+=Gallery_itemclick; }        Private voidGallery_itemclick (Objectsender, Adapterview.itemclickeventargs e) {Toast.maketext ( This, E.position.tostring (), Toastlength.short).        Show (); }    }     Public classImageadapter:baseadapter {Privatecontext Context; Private int[] Thumbids ={Resource.Drawable.sample_1, Resource.Drawable.sample_2, Resource.Drawable.sample_3            , Resource.Drawable.sample_4, Resource.Drawable.sample_5, Resource.Drawable.sample_6,        Resource.Drawable.sample_7}; //The default value is 500 (this is a new feature of C # 6.0, only VS2015 can use this)         Public intCurrentwidth {Get;Set; } = -;  Public intCurrentheight {Get;Set; } = -;  PublicImageadapter (context C) {context=C; }         Public Override intCount {Get{returnThumbids.length;} }         Public OverrideView GetView (intposition, View Convertview, ViewGroup parent) {ImageView I=NewImageView (context);            I.setimageresource (Thumbids[position]); I.layoutparameters=NewGallery.layoutparams ( -, -);            I.setscaletype (ImageView.ScaleType.FitXy); returni; }         Public Override LongGetitemid (intposition) {            return 0; }         Public OverrideJava.Lang.Object GetItem (intposition) {            return NULL; }    }}

Run.

5th Chapter (8) Photo Gallery (Galery)