FileInputStream fis.read() gives exception
<p>I want to gain access to SD-CARD for this i am write some code :</p>

<pre><code>File f=Environment.getExternalStorageDirectory().getAbsolutePath();

//   f=/mnt/sdcard 

byte[] bytearray=new byte[4];

FileInputStream fis=new FileInputStream(f);

fis.read(bytearray,1,1);   //This line gives exception
</code></pre>

<p>I  can't figure out why this an exception</p>
