Also show the error Toast in the preview activity when playback fails.

Change-Id: Ic35b116b63554f89a44efcfa8321f2cc4558c87c
diff --git a/src/com/android/music/AudioPreview.java b/src/com/android/music/AudioPreview.java
index 22c9c7d..b7d1533 100644
--- a/src/com/android/music/AudioPreview.java
+++ b/src/com/android/music/AudioPreview.java
@@ -46,6 +46,7 @@
 import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.SeekBar.OnSeekBarChangeListener;
+import android.widget.Toast;
 
 import java.io.IOException;
 
@@ -315,6 +316,7 @@
     };
 
     public boolean onError(MediaPlayer mp, int what, int extra) {
+        Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
         finish();
         return true;
     }