- Forum posts: 1
Oct 29, 2014, 12:53:04 PM via Website
Oct 29, 2014 12:53:04 PM via Website
Hello,
I'm kinda new to android and have some problems that I don't know how to fix.
So I have MainActivity.java where I've defined button which when is clicked open second Activity. The second activity must retrieve data from mysql but I get that error instead:
Error org.json.JSONEXception: Value of type java.lang.String cannot be converted to JSONObject
here is the code of second activity:
public class Restaurants extends Activity {
private String jsonResult;
private String url = "link to my localhost";
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.restaurants);
listView = (ListView) findViewById(R.id.listView1);
accessWebService();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// Async Task to access the web
private class JsonReadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
@Override
protected void onPostExecute(String result) {
ListDrwaer();
}
}// end async task
public void accessWebService() {
JsonReadTask task = new JsonReadTask();
// passes values for the urls string array
task.execute(new String[] { url });
}
// build hash set for list view
public void ListDrwaer() {
List<Map<String, String>> restaurantList = new ArrayList<Map<String, String>>();
try {
JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = jsonResponse.optJSONArray("restoranti");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String name = jsonChildNode.optString("name");
String menu = jsonChildNode.optString("menu");
String outPut = name + "-" + menu;
restaurantList.add(createRestaurants("restoranti", outPut));
}
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Error " + e.toString(),
Toast.LENGTH_SHORT).show();
}
SimpleAdapter simpleAdapter = new SimpleAdapter(this, restaurantList,
android.R.layout.simple_list_item_1,
new String[] { "restoranti" }, new int[] { android.R.id.text1 });
listView.setAdapter(simpleAdapter);
}
private HashMap<String, String> createRestaurants(String name, String menu) {
HashMap<String, String> restaurantNameNo = new HashMap<String, String>();
restaurantNameNo.put(name, menu);
return restaurantNameNo;
}
}
— modified on Oct 29, 2014, 1:55:49 PM