서버에서 내 응용 프로그램으로 Json 데이터를 구문 분석 할 응용 프로그램을 만들었습니다. 하지만 지금은 프로젝트를 실행할 때 JSONArray를 JSONObject 예외로 변환 할 수 없습니다. LogCat 뷰에서는 모든 서버 데이터를 가져 오지만 응용 프로그램에서는 그렇지 않습니다. 나는 다른 방법으로 시도했지만 운이 없었습니다. 감사합니다.오류 JSONArray를 JSONObject로 변환 할 수 없습니다.
이것은
public class jsonExample2 extends Activity{
// This is the url that i try to get data
private static String url = "http://api.worldbank.org/countries/ir?format=json";
private static final String PAGE = "page";
private static final String VALUE = "value";
private static final String NAME = "name";
private static final String GEO = "region";
JSONArray page = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activitybw);
new GetJSONTask().execute(url);
}
class GetJSONTask extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... urls) {
try {
JSONParser jParser = new JSONParser();
return jParser.getJSONFromUrl(urls[0]);
} catch (Exception e) {
return null;
}
}
protected void onPostExecute(JSONObject json) {
// do all the parsing here:
try {
page = json.getJSONArray(PAGE);
JSONObject c = page.getJSONObject(0);
String value = c.getString(VALUE);
String name = c.getString(NAME);
String geo = c.getString(GEO);
final TextView id1 = (TextView) findViewById(R.id.id);
final TextView name1 = (TextView) findViewById(R.id.name);
final TextView geo1 = (TextView) findViewById(R.id.geo);
id1.setText(value);
name1.setText(name);
geo1.setText(geo);
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}
}
// JSONParser 클래스
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jObj;
}
}
내 주요 코드 // //이 내 로그 캣보기
03-19 09:11:52.776: D/dalvikvm(1376): GC_CONCURRENT freed 129K, 10% free 2629K/2904K, paused 75ms+101ms, total 286ms
03-19 09:11:52.846: E/JSON Parser(1376): Error parsing data org.json.JSONException: Value [{"total":1,"page":1,"per_page":"50","pages":1},[{"region":{"value":"Middle East & North Africa (all income levels)","id":"MEA"},"id":"IRN","incomeLevel":{"value":"Upper middle income","id":"UMC"},"name":"Iran, Islamic Rep.","iso2Code":"IR","lendingType":{"value":"IBRD","id":"IBD"},"longitude":"51.4447","latitude":"35.6878","capitalCity":"Tehran","adminregion":{"value":"Middle East & North Africa (developing only)","id":"MNA"}}]] of type org.json.JSONArray cannot be converted to JSONObject
03-19 09:11:52.846: D/AndroidRuntime(1376): Shutting down VM
03-19 09:11:52.855: W/dalvikvm(1376): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
03-19 09:11:52.876: E/AndroidRuntime(1376): FATAL EXCEPTION: main
03-19 09:11:52.876: E/AndroidRuntime(1376): java.lang.NullPointerException
03-19 09:11:52.876: E/AndroidRuntime(1376): at com.example.mediaplayerapp.jsonExample2$GetJSONTask.onPostExecute(jsonExample2.java:79)
줄 79'jsonExample2.java' 무엇입니까? – Raghunandan