title: what's the readStream() method? i just can not find it anywhere,
body: <p>i searched how to use resources under the directory "assets", then i find a snippet:</p>
  
  <pre><code>AssetManager assets = getAssets();
  ((TextView)findViewById(R.id.txAssets)).setText(**readStream**(assets.open("data.txt")));
  </code></pre>
  
  <p>i just cannot find what's the readStream method, it is not in the google apis
   i tried to download the newest Java api document, but still can not find it, anybody knows that?</p>