Android Development with remote database

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http://stackoverflow.com – I need help with my Android project. When I'm trying to run this, the app stops. Here is the code: Login.java public class Login extends Activity implements OnClickListener { private EditText user, pass; private Button mSubmit, mRegister; // Progress Dialog private ProgressDialog pDialog; // JSON parser class JSONParser jsonParser = new JSONParser(); //php login script location: private static final String LOGIN_URL = ""; //JSON element ids from repsonse of php script: private static final String TAG_SUCCESS = "success"; p (HowTos)