Question

好的，我有我的主要课程

public class ViewSpotActivity extends Activity {...}

在onCreate（）中新的GetSpotDetails（）。execute（）;被称为。

获取Spot详细信息如下所示：

class GetSpotDetails extends AsyncTask<String, String, JSONObject> {
        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ViewSpotActivity.this);
            pDialog.setMessage("Loading Spot details. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }
        /**
         * Getting details in background thread
         * */
        protected JSONObject doInBackground(String... String) {
            JSONObject spot = null;
            // Check for success tag
            int success;
            try {
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("pid", pid));
                // getting details by making HTTP request
                // Note that details url will use GET request
                JSONObject json = jsonParser.makeHttpRequest(
                        url_detials, "GET", params);
                // check your log for json response
                Log.d("Single Spot Details", json.toString());
                // json success tag
                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    // successfully received product details
                    JSONArray spotObj = json
                            .getJSONArray(TAG_SPOT); // JSON Array
                    // get first product object from JSON Array
                    int value = Integer.parseInt(pid);
                     int n=0;
                  while(Integer.parseInt(spotObj.getJSONObject((n)).getString(TAG_PID))!=value){
                     n++;
                    }
                    spot = spotObj.getJSONObject((n));
                }else{
                    // product with pid not found
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
            return spot;
        }
        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(JSONObject spot) {
            if (spot != null) {
                setContentView(R.layout.view_spot);
                // pid found
                // Edit Text
                txtName = (TextView) findViewById(R.id.outputName);
                txtLong = (TextView) findViewById(R.id.outputLong);
                txtLat = (TextView) findViewById(R.id.outputLat);
                txtPavement = (TextView) findViewById(R.id.outputPavement);
                txtTraffic = (TextView) findViewById(R.id.outputTraffic);
                txtEnvironment = (TextView) findViewById(R.id.outputEnvironment);
                //need to add rest...
                // display data in Text
                try {
                    //need to add rest...
                    txtName.setText("Spot Name: " + spot.getString(TAG_NAME));
                    txtLong.setText("Longitude: " + spot.getString(TAG_LONG));
                    txtLat.setText("Latitude: " + spot.getString(TAG_LAT));
                    txtPavement.setText("Pavement: " + spot.getString(TAG_PAVEMENT));
                    txtTraffic.setText("Traffic: " + spot.getString(TAG_TRAFFIC));
                    txtEnvironment.setText("Environment: " + spot.getString(TAG_ENVIRONMENT));
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            // dismiss the dialog once got all details
            pDialog.dismiss();
        }
    }
}

我希望能够在spot.getString（TAG_LONG）和spot.getString（TAG_LAT）中获取信息，并在onCreate下的onClick中使用它们。有没有办法在不调用新的GetSpotDetails（）。execute（）;的情况下执行此操作。很抱歉，如果这是一个简单的答案，我对Android上的编程相当新。

谢谢你，泰勒

Answer 1

您应该做的是为您想要的信息创建getter方法。首先，您应该在类中私有地存储您需要访问的变量，然后将值分配给它们，然后您应该有返回该数据的辅助方法。

所以你可以这样做：

    private String userName;

然后将其分配到正确的位置，并访问它：

    public String getName()
    {
         return userName;
    }

在类之间共享可变信息

1 个答案: