Media player object is returning null

I am trying to create an audio player object as shown below. Here I get the value for path, but when I inspect for the full, I am getting null, i.e., alertPlayer is returning null for me.

Here is my code,

public class Audio extends Activity  {

   private static MediaPlayer alertPlayer;

   private static void AudioAlert(String alertPath)开发者_开发问答 {

   alertPlayer = MediaPlayer.create(Audio.this, Uri.fromfile(new File(path)));
   alertPlayer.prepare();
   alertPlayer.start();
   alertPlayer.stop();

   }
}

I am getting the value for this, Uri.fromfile(new File(path)) as it is expected, but MediaPlayer.create(Audio.this, Uri.fromfile(new File(path))); return null.

Any answer for this?

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MediaPlayer is null - it's as simple as that. You've described the type, so you have a null, uninstantiated "reference" to an instance of that type, which you then use to invoke the create method. You need to create an instance of MediaPlayer before you can use it.

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I solved the issue, alertPlayer.prepare() was causing the illegal stateexception. However, now also am not clear why is it happening like that.