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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