android - 无法访问android中的父类(super class)成员

Question

<分区>

Answer 1

在onCreate...之前定义字符串...

public class XyzActivity extends ListActivity {

// JSON Node names
            private static final String TAG_CONTACTS = "results";
            private static final String TAG_ID = "id";
            private static final String TAG_NAME = "name";
            private static final String TAG_GENDER = "rating";
            private static final String TAG_ADDRESS = "formatted_address";
            private static final String TAG_REFERENCE = "reference";


            private static final String TAG_LOCATION = "location";
            private static final String TAG_TYPE="type";


// contacts JSONArray
JSONArray results = null;

private String url = "";


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Bundle extras = getIntent().getExtras();
    if (extras != null) {
       String location = extras.getString("TAG_LOCATION");

    // url to make request
    url = "https://maps.googleapis.com/maps/api/place/textsearch/json?query=restaurents+in+"+location+"&sensor=true&key=AIzaSyD38pak_katUfSR92WE2_O2b9y0JSp5htA";
    }

    LoadData ld = new LoadData();

new LoadData().execute();

}

class LoadData extends AsyncTask<String, String, String>
{ 
ProgressDialog pDialog;

protected void onPreExecute() {

pDialog = new ProgressDialog(Xyz.this); 
pDialog.setMessage("Populating list please wait...");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(false);
    pDialog.show();
}

// Hashmap for ListView
    ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
protected String doInBackground(String... args) {


    // Creating JSON Parser instance
    JSONParser jParser = new JSONParser();
    // getting JSON string from URL
    JSONObject json = jParser.getJSONFromUrl(url);

    try {
        // Getting Array of Results
        results = json.getJSONArray(TAG_CONTACTS);

        // looping through All Contacts
        for(int i = 0; i < results.length(); i++){
            JSONObject c = results.getJSONObject(i);

            // Storing each json item in variable
            String id = c.getString(TAG_ID);
            String name = c.getString(TAG_NAME);
            String formatted_address = c.getString(TAG_ADDRESS);
            String rating = c.getString(TAG_GENDER);

            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();

            // adding each child node to HashMap key => value
            map.put(TAG_ID, id);
            map.put(TAG_NAME, name);
            map.put(TAG_ADDRESS, formatted_address);
            map.put(TAG_GENDER, rating);

            // adding HashList to ArrayList
            contactList.add(map);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return null;
        }    
    protected void onPostExecute(String file_url) {

    this.pDialog.cancel();
            // dismiss the dialog after getting all products
                /**
     * Updating parsed JSON data into ListView
     * */
    ListAdapter adapter = new SimpleAdapter(Xyz.this, contactList,
            R.layout.listview_item_row,
            new String[] { TAG_NAME, TAG_ADDRESS, TAG_GENDER,}, new int[] {
                    R.id.txtTitle, R.id.txtTitle1, R.id.txtTitle3 });

    setListAdapter(adapter);

    // selecting single ListView item
    ListView lv = getListView();

    // Launching new screen on Selecting Single ListItem
    lv.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            // Starting new intent
            Intent in = new Intent(getApplicationContext(), ProfileViewActivity.class);

        }
    });

    }

}
}