Xamarin.Android 调用本地相册

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 = 1; //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, 1); 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[0]; if ("primary".Equals(type.ToLower())) { return Android.OS.Environment.ExternalStorageDirectory + "/" + split[1]; } // 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[0]; 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[1] }; 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 } }