Alert box in Android

As as java script we show a alert dailoge box.

Java Code:

    protected void alertbox(String title, String mymessage) 
        { 
        new AlertDialog.Builder(this) 
           .setMessage(mymessage) 
          .setTitle(title) 
           .setCancelable(true) 
           .setNeutralButton(android.R.string.cancel, 
              new DialogInterface.OnClickListener() { 
              public void onClick(DialogInterface dialog, int whichButton){} 
              }) 
           .show(); 
        }