FQL Facebook API return null value
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I have code to get pid all photo of page albums.

    String query = "SELECT pid FROM photo WHERE aid='100891649965116_15801'";
    Bundle params = new Bundle();
    params.putString("method", "fql.query");
    params.putString("query", query);
    Utility.mAsyncRunner.request(null, params, new FQLRequestListener());

But result always null.. I think that my problem is that i have not access_token in my app.. How to do fix my problem, can you give me some examples code, thank