如果你想从资产的文件夹中使用文件的访问以下code：

If you want access file from assets folder use following code:

        InputStream is = getAssets().open("contacts.csv");
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(is);
        HttpContext localContext = new BasicHttpContext();
        HttpResponse response =httpClient.execute(httpGet, localContext);
        BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));