Question

首先，我使用三星Galaxy Tab 2进行调试。我知道三星cam-intent的问题。这似乎是OnActivityResult中数据意图的常见问题。但我的似乎是另一个。

我得到NullReferenceException我无法本地化。但是让我们来看看代码（它是它的一部分）：

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        System.Console.WriteLine("---------------Reached OnActivityResult");
        base.OnActivityResult(requestCode, resultCode, data);
        var pic = new Picture();
        if (requestCode == 0 && resultCode == Result.Ok)
        {
            if (requestCode == 0)
            {
                if (data != null)
                {
                    Uri imageUri = null;
                    // Check if the result includes a thumbnail Bitmap
                    var mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
                    var contentUri = Android.Net.Uri.FromFile(_file);
                    mediaScanIntent.SetData(contentUri);
                    this.SendBroadcast(mediaScanIntent);
                    var bitmap = MediaStore.Images.Media.GetBitmap(ContentResolver, contentUri);
                    var info = data.GetStringArrayExtra("PictureInfo");

                    pic = new Picture(info[0], int.Parse(info[2]), info[1],
                                        Core.Helpers.ConversionHelper.GetStringFromImage(bitmap));
                }
                else
                {
                    ContentResolver cr = ContentResolver;
                    String[] p1 = new String[] {
                        MediaStore.Images.ImageColumns.Id,
                        MediaStore.Images.ImageColumns.DateTaken
                        };
                    ICursor c1 = cr.Query(MediaStore.Images.Media.ExternalContentUri, p1, null, null, p1[1] + " DESC");
                    if (c1.MoveToFirst())
                    {
                        String uristringpic = "content://media/external/images/media/" + c1.GetInt(0);
                        Android.Net.Uri newuri = Android.Net.Uri.Parse(uristringpic);
                        Log.Info("TAG", "newuri   " + newuri);
                        var bitmap = MediaStore.Images.Media.GetBitmap(ContentResolver, newuri);
                        pic = new Picture(_picture.DocumentNo, _picture.LineNo, _picture.ItemNo, Core.Helpers.ConversionHelper.GetStringFromImage(bitmap));
                    }
                    c1.Close();
                }
            }
        }

运行此代码我得到System.Console输出和Log.Info输出。所以我知道它直到这一行Log.Info("TAG", "newuri " + newuri);

想法？我会很感激。： - /

LogCat消息：

 09-06 13:30:11.910: E/mono(17434):   at Android.App.Activity.n_OnActivityResult_IILandroid_content_Intent_ (IntPtr jnienv, IntPtr native__this, Int32 requestCode, Int32 native_resultCode, IntPtr native_data) [0x00013] in /Users/builder/data/lanes/monodroid-mac-monodroid-4.2.4-branch/9f7cbd60/source/monodroid/src/Mono.Android/platforms/android-12/src/generated/Android.App.Activity.cs:1557

在Camera之后获取NullReferenceException OnActivityResult

0 个答案: