CODEWITHSUNDEEP
c#javaandroidxamarin.android
anguish
anguish

Reputation: 458

Monodroid BitmapFactory.DecodeFileDescriptor Bitmap always null

I use the following method to prevend a outofmemory exception, but the Bitmap ist always null. Has anybody an idea?

public Bitmap readBitmap(Android.Net.Uri selectedImage) {

        Bitmap bm = null;
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.InSampleSize = 9;
        AssetFileDescriptor fileDescriptor = null;
        try {
            fileDescriptor =  this.ContentResolver.OpenAssetFileDescriptor(selectedImage,"r");
        } catch (FileNotFoundException e) {
            Toast.MakeText(this, e.Message, ToastLength.Long);
        }
        finally{
            try {
                bm =  BitmapFactory.DecodeFileDescriptor(fileDescriptor.FileDescriptor, null, options);
                fileDescriptor.Close();
            } catch (IOException) {
            }
        }
        return bm;
}

Upvotes: 0

Views: 756

Answers (4)

Uriel Frankel
Uriel Frankel

Reputation: 14612

Yes. This is another bug of Google. Solution is to do this:

bm =  BitmapFactory.decodeStream(new FileInputStream(fileDescriptor));

Instead of 

bm =  BitmapFactory.DecodeFileDescriptor(fileDescriptor.FileDescriptor, null, options);

Upvotes: 1

Andy Res
Andy Res

Reputation: 16043

Perhaps the Uri is incorect and FileNotFoundException is thrown. But you can't see this because you are missing the show() method of the Toast in the catch clause.

Should be like this:

 Toast.MakeText(this, e.Message, ToastLength.Long).show();

Upvotes: 0

Androyds
Androyds

Reputation: 491

On your catch, try modifying like this

} catch (IOException e) {
   Log.v ("Message", ""+e.message);
        }

So you could see whats the error that it returns to null

Upvotes: 0

Ameen
Ameen

Reputation: 2586

BitmapFactory.DecodeFileDescriptor must be throwing an exception if bm is null.

Upvotes: 0

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