I've recently observed similar issues.
First of all there seems to be reports that different devices may be to
blame. Samsungs are notorious for such bug
http://stackoverflow.com/questions/7031374/photo-capture-intent-causes-nullpointerexception-on-samsung-phones-only/7031422#7031422
Secondly, and that I have observed on Samsung Galaxy2, when taking picture
and rotating the device *before *accepting the image, it *may* lose the
image and result in *_file == null*.
There are plenty of discussions on stackoverflow about this as well.
I have mitigated this issue with the following code:
if (this.file == null)
{
// find the last image taken
string[] p1 = new string[] {
MediaStore.Images.ImageColumns.Id,
MediaStore.Images.ImageColumns.DateTaken,
MediaStore.Images.ImageColumns.Data,
};
using (var cursor =
this.ContentResolver.Query(MediaStore.Images.Media.ExternalContentUri,
p1, null, null, p1[1] + " DESC"))
{
if (cursor.MoveToFirst())
{
var c = cursor.GetString(2);
this.file = new File(c);
}
}
}
Hope this helps.
Igor
On 7 May 2013 04:47, <[email protected]> wrote:
> ---------- Forwarded message ----------
> From: Massimiliano Fabbri <[email protected]>
> To: Discussions related to Mono for Android <[email protected]>
> Cc:
> Date: Mon, 06 May 2013 19:09:36 +0200
> Subject: [mono-android] Camera get photo sample
> I'm following the camera photo sample from here:
>
> http://docs.xamarin.com/recipes/android/other_ux/camera_intent/take_a_picture_and_save_using_camera_app
>
> The issue I got is the _file variable is always null!!
> the _dir variable is ok.
>
> Where I'm wrong ?
>
> Java.IO.File _file;
> Java.IO.File _dir;
>
> private void TakeAPicture(object sender, EventArgs eventArgs)
> {
> Intent intent = new Intent(MediaStore.ActionImageCapture);
>
> _file = new Java.IO.File(_dir, String.Format("myPhoto_{0}.jpg"
> , Guid.NewGuid()));
>
> intent.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.
> FromFile(_file));
>
> StartActivityForResult(intent, 100);
> }
>
>
> ...........
> ...........
> protected override void OnActivityResult(int requestCode, Result
> resultCode, Intent data)
> {
> base.OnActivityResult(requestCode, resultCode, data);
>
> if (requestCode == 100 && resultCode == Result.Ok)
> {
> if (_file != null) <----------- Is always False!!!
>
>
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