Xamarin.Android 调用本地相册

　　调用本地相册选中照片在ImageView上显示

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Provider;
using Android.Database;
using System.Threading;
using Java.IO;

namespace CallLocalPhoto
{
    [Activity(Label = "CallLocalPhoto", MainLauncher = true)]
    public class MainActivity : Activity
    {
        Button btn;
        ImageView iv;

        private Java.IO.File originalFile;
        private const int PhotoGallery_RequestCode = ;     //设置返回代码Code，可自行定义
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);
            originalFile = new Java.IO.File(Android.OS.Environment.GetExternalStoragePublicDirectory(
                Android.OS.Environment.DirectoryPictures
                ), "zcb_pic_" + SystemClock.CurrentThreadTimeMillis() + ".png");

            btn = FindViewById<Button>(Resource.Id.button1);
            iv = FindViewById<ImageView>(Resource.Id.imageView1);
            btn.Click += Btn_Click;
        }

        private void Btn_Click(object sender, EventArgs e)
        {
            CutImageByImgStore();
        }

        /// <summary>
        /// 调用相册选择
        /// </summary>
        private void CutImageByImgStore()
        {
            Intent _intentCut = new Intent(Intent.ActionGetContent, null);
            _intentCut.SetType("image/*");// 设置文件类型
            _intentCut.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(originalFile));
            _intentCut.PutExtra(MediaStore.ExtraVideoQuality, );

            StartActivityForResult(_intentCut, PhotoGallery_RequestCode);
        }

        /// <summary>
        /// 选择图片后返回
        /// </summary>
        /// <param name="requestCode"></param>
        /// <param name="ResultStatus"></param>
        /// <param name="data"></param>
        protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result ResultStatus, Intent data)
        {
            if (ResultStatus == Result.Ok)
            {
                /*
                * 若系统版本低于4.4，返回原uri
                * 若高于4.4，解析uri后返回
                * */
                if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)
                {
                    var url = Android.Net.Uri.Parse("file://" + GetPath(BaseContext, data.Data));
                    data.SetData(url);

                    //将本地相册照片显示在控件上
                    iv.SetImageURI(Android.Net.Uri.FromFile(new File(GetPath(BaseContext, data.Data))));
                }
            }
        }

        #region 高于 v4.4 版本 解析真实路径

        public static String GetPath(Context context, Android.Net.Uri uri)
        {

            bool isKitKat = Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat;

            // DocumentProvider
            if (isKitKat && DocumentsContract.IsDocumentUri(context, uri))
            {
                // ExternalStorageProvider
                if (isExternalStorageDocument(uri))
                {
                    String docId = DocumentsContract.GetDocumentId(uri);
                    String[] split = docId.Split(':');
                    String type = split[];

                    if ("primary".Equals(type.ToLower()))
                    {
                        return Android.OS.Environment.ExternalStorageDirectory + "/" + split[];
                    }

                    // TODO handle non-primary volumes
                }
                // DownloadsProvider
                else if (isDownloadsDocument(uri))
                {

                    String id = DocumentsContract.GetDocumentId(uri);
                    Android.Net.Uri contentUri = ContentUris.WithAppendedId(
                            Android.Net.Uri.Parse("content://downloads/public_downloads"), long.Parse(id));

                    return getDataColumn(context, contentUri, null, null);
                }
                // MediaProvider
                else if (isMediaDocument(uri))
                {
                    String docId = DocumentsContract.GetDocumentId(uri);
                    String[] split = docId.Split(':');
                    String type = split[];

                    Android.Net.Uri contentUri = null;
                    if ("image".Equals(type))
                    {
                        contentUri = MediaStore.Images.Media.ExternalContentUri;
                    }
                    else if ("video".Equals(type))
                    {
                        contentUri = MediaStore.Video.Media.ExternalContentUri;
                    }
                    else if ("audio".Equals(type))
                    {
                        contentUri = MediaStore.Audio.Media.ExternalContentUri;
                    }

                    String selection = "_id=?";
                    String[] selectionArgs = new String[] {
                    split[]
            };

                    return getDataColumn(context, contentUri, selection, selectionArgs);
                }
            }
            // MediaStore (and general)
            else if ("content".Equals(uri.Scheme.ToLower()))
            {

                // Return the remote address
                if (isGooglePhotosUri(uri))
                    return uri.LastPathSegment;

                return getDataColumn(context, uri, null, null);
            }
            // File
            else if ("file".Equals(uri.Scheme.ToLower()))
            {
                return uri.Path;
            }

            return null;
        }

        /**
         * Get the value of the data column for this Uri. This is useful for
         * MediaStore Uris, and other file-based ContentProviders.
         *
         * @param context The context.
         * @param uri The Uri to query.
         * @param selection (Optional) Filter used in the query.
         * @param selectionArgs (Optional) Selection arguments used in the query.
         * @return The value of the _data column, which is typically a file path.
         */
        public static String getDataColumn(Context context, Android.Net.Uri uri, String selection,
                String[] selectionArgs)
        {

            ICursor cursor = null;
            String column = "_data";
            String[] projection = {
                column
            };

            try
            {
                cursor = context.ContentResolver.Query(uri, projection, selection, selectionArgs,
                        null);
                if (cursor != null && cursor.MoveToFirst())
                {
                    int index = cursor.GetColumnIndexOrThrow(column);
                    return cursor.GetString(index);
                }
            }
            finally
            {
                if (cursor != null)
                    cursor.Close();
            }
            return null;
        }

        /**
         * @param uri The Uri to check.
         * @return Whether the Uri authority is ExternalStorageProvider.
         */
        public static bool isExternalStorageDocument(Android.Net.Uri uri)
        {
            return "com.android.externalstorage.documents".Equals(uri.Authority);
        }

        /**
         * @param uri The Uri to check.
         * @return Whether the Uri authority is DownloadsProvider.
         */
        public static bool isDownloadsDocument(Android.Net.Uri uri)
        {
            return "com.android.providers.downloads.documents".Equals(uri.Authority);
        }

        /**
         * @param uri The Uri to check.
         * @return Whether the Uri authority is MediaProvider.
         */
        public static bool isMediaDocument(Android.Net.Uri uri)
        {
            return "com.android.providers.media.documents".Equals(uri.Authority);
        }

        /**
         * @param uri The Uri to check.
         * @return Whether the Uri authority is Google Photos.
         */
        public static bool isGooglePhotosUri(Android.Net.Uri uri)
        {
            return "com.google.android.apps.photos.content".Equals(uri.Authority);
        }

        #endregion
    }
}

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