第四课 Gallery的使用

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直接上代码

1.Layout——Main.axml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:minWidth="25px"

android:minHeight="25px">

<TextView

android:text="@string/Welcome"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/textView1" />

<Gallery

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/gallery1" />

</LinearLayout>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
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.csharpcode .lnum { color: #606060; }

2.Activity1.cs

using System;

using Android.App;

using Android.Content;

using Android.Runtime;

using Android.Views;

using Android.Widget;

using Android.OS;

using Android.Database;

using Android.Provider;

namespace GalleryViewDemo

{

[Activity(Label = "Gallery View Sample", MainLauncher = true, Icon = "@drawable/icon")]

public class GalleryViewSample : Activity

{

protected override void OnCreate(Bundle bundle)

{

base.OnCreate(bundle);

// Set our view from the "main" layout resource

SetContentView(Resource.Layout.Main);

CreateGallery();

}

private void CreateGallery()

{

Gallery g = this.FindViewById<Gallery>(Resource.Id.gallery1);

g.Adapter = new ImageAdapter(this);

}

3.ImageAdapter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;using Android;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Database;
using Android.Provider;namespace GalleryViewDemo
{
public class ImageAdapter : BaseAdapter
{
Context _Context;
ICursor _ImageCursor;
protected ICursor ImageCursor
{
get
{
if (_ImageCursor == null)
{
_ImageCursor = GetImageCursor();
}
return _ImageCursor;
}
set
{
_ImageCursor = value;
}
}
public ImageAdapter(Context c)
{
_Context = c;
}
private ICursor GetImageCursor()
{
string[] Projection = { MediaStore.Images.Thumbnails.ImageId };
var ImageCursor = ((Activity)_Context).ManagedQuery(MediaStore.Images.Thumbnails.ExternalContentUri,
Projection, null, null, null);
return ImageCursor;
}
public override int Count
{
get { return ImageCursor.Count; }
} public override Java.Lang.Object GetItem(int position)
{
return position;
} public override long GetItemId(int position)
{
ImageCursor.MoveToPosition(position);
var ImageId = ImageCursor.GetString(0);
return position;
} public override View GetView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
ImageView ReturnView = new ImageView(_Context);
ImageCursor.MoveToPosition(position); var ImageId = ImageCursor.GetString(0);
ReturnView.SetImageURI(Android.Net.Uri.WithAppendedPath(MediaStore.Images.Thumbnails.ExternalContentUri, ImageId));
ReturnView.SetScaleType(ImageView.ScaleType.CenterCrop);
return ReturnView;
}
else
{
return(ImageView) convertView;
}
}
}
}