Java.Lang.NoClassDefFoundError on extending DataMediaSource

Question

I am trying to implement own MediaDataSource to decrypt videos on runtime. But I have a problem on very early stage: I just created class inherit it from MediaDataSource . Here is the code:

    class SimpleSource : Android.Media.MediaDataSource
    {
            private string v;

            public SimpleSource(string v)
            {
                 this.v = v;
            }

            public override long Size
            {
                 get
                 {
                      throw new NotImplementedException();
                 }
            }

            public override int ReadAt(long position, byte[] buffer, int offset, int size)
            {
                  throw new NotImplementedException();
            }

            public override void Close()
            {
                  throw new NotImplementedException();
            }
     }

And when I am calling var source = new SimpleSource("fname.ax"); it throws Java.Lang.NoClassDefFoundError in constructor.

I tried it to run on android 4.1, 4.4 and 5.1.1 but got the same result.

Exception screenshot on android 4.1

Exception screenshot on android 5.1.1

Answer 1

Now with the release of API 23, Android allows you to create a class that derives from MediaDataSource

Your devices are lower API level than required.