如何在android中动态地从Mysql获取数据到spinner

Question

我需要从mysql表中获取数据到我的android应用程序微调器，当我在AVD上运行它运行并开始获取进程然后应用程序突然停止并自动关闭并显示消息＆＃34;不幸的是项目已停止工作＆ ＃34;我已从http://www.androidhive.info/2013/12/android-populating-spinner-data-from-mysql-database/站点下载此代码，并希望删除创建类别代码，并且需要代码才能将数据从数据库提取到微调器。我是Android开发的新手，请提前告诉我，谢谢你

public class MainActivity extends Activity implements OnItemSelectedListener {


    private TextView txtCategory;
    private Spinner spinnerFood;
    // array list for spinner adapter
    private ArrayList<Category> categoriesList;
    ProgressDialog pDialog;

    // API urls

    // Url to get all categories
    private String URL_CATEGORIES = "http://10.0.2.2:8383/mysqlData/get_all_programs.php";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        spinnerFood = (Spinner) findViewById(R.id.spinFood);


        categoriesList = new ArrayList<Category>();

        // spinner item select listener
        spinnerFood.setOnItemSelectedListener(this);



        //new GetCategories().execute();
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                // fetching all categories
                new GetCategories().execute();
            }
        });
    }
private void populateSpinner() {
        List<String> lables = new ArrayList<String>();

        txtCategory.setText("");

        for (int i = 0; i < categoriesList.size(); i++) {
            lables.add(categoriesList.get(i).getName());
        }

        // Creating adapter for spinner
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, lables);

        // Drop down layout style - list view with radio button
        spinnerAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        spinnerFood.setAdapter(spinnerAdapter);
    }
private class GetCategories extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Fetching food categories..");
            pDialog.setCancelable(false);
            pDialog.show();

        }

        @Override

        protected Void doInBackground(Void... arg0) {
            ServiceHandler jsonParser = new ServiceHandler();
            String json = jsonParser.makeServiceCall(URL_CATEGORIES, ServiceHandler.GET);

            Log.e("Response: ", "> " + json);

            if (json != null) {
                try {
                    JSONObject jsonObj = new JSONObject(json);
                    if (jsonObj != null) {
                        JSONArray categories = jsonObj
                                .getJSONArray("categories");                        

                        for (int i = 0; i < categories.length(); i++) {
                            JSONObject catObj = (JSONObject) categories.get(i);
                            Category cat = new Category(catObj.getInt("id"),
                                    catObj.getString("name"));
                            categoriesList.add(cat);
                        }
                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                }

            } else {
                Log.e("JSON Data", "Didn't receive any data from server!");
            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            if (pDialog.isShowing())
                pDialog.dismiss();
            populateSpinner();
        }

    }
public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {
        Toast.makeText(
                getApplicationContext(),
                        parent.getItemAtPosition(position).toString() + " Selected" ,
                Toast.LENGTH_LONG).show();

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {        

    }
}