【Android】12.4 利用Intent读取图库中的图片

<?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">
    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="30dp"
        android:layout_gravity="center"
        android:text="从图库中挑选一幅图片" />
    <TextView
        android:text="你挑选的图片为："
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView1"
        android:layout_gravity="center"
        android:layout_margin="30dp" />
    <ImageView
        android:id="@+id/myImageView"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Widget;

namespace MyDemos.SrcDemos
{
    [Activity(Label = "【例12-3】读取图库图片")]
    public class ch1203ReadGallery : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.ch1203_ReadGallery);
            var btn1 = FindViewById<Button>(Resource.Id.btn1);
            btn1.Click += delegate {
                var imageIntent = new Intent();
                imageIntent.SetType("image/*");
                imageIntent.SetAction(Intent.ActionGetContent);
                StartActivityForResult( Intent.CreateChooser(imageIntent, "选择的图片："), 0);
            };
        }

        protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
        {
            base.OnActivityResult(requestCode, resultCode, data);
            if (resultCode == Result.Ok)
            {
                var imageView = FindViewById<ImageView>(Resource.Id.myImageView);
                imageView.SetImageURI(data.Data);
            }
        }
    }
}