Adding Async Task to JSON Crashes Activity

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http://stackoverflow.com – I'd like to know how to add an AsyncTask (successfully) to the following code. I've already implemented the AsyncTask (to the best of my knowledge - using info I've found on the net) however it keeps crashing and I'm not sure exactly why... any help is greatly appreciated! JAVA: import org.json.JSONException; import org.json.JSONObject; import com.nfc.linked.DatabaseHandler; import com.nfc.linked.UserFunctions; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android (HowTos)