我正在尝试将 json 数组从 Internet 转换为 listview。服务器中的 php 代码正常工作并返回下面的 json 字符串。logcat 中的结果 json 是：
11-09 20:47:04.170: I/AllNotes >> jSon >>(429): {"notes":{"3":{"note_subject":"dshjdsfjsdfsdhf","note_id":"4","note_date":"0000-00-00"},"2":{"note_subject":"dshjdsfjsdfsdhf","note_id":"3","note_date":"0000-00-00"},"1":{"note_subject":"dshjdsfjsdfsdhf","note_id":"2","note_date":"0000-00-00"},"0":{"note_subject":"dshjdsfjsdfsdhf","note_id":"1","note_date":"0000-00-00"},"7":{"note_subject":"dshjdsfjsdfsdhf","note_id":"8","note_date":"1391\/8\/19"},"6":{"note_subject":"dshjdsfjsdfsdhf","note_id":"7","note_date":""},"5":{"note_subject":"dshjdsfjsdfsdhf","note_id":"6","note_date":""},"4":{"note_subject":"dshjdsfjsdfsdhf","note_id":"5","note_date":""}},
"success":"1"}
我的 JSONParser 类是：
package ir.mohammadi.android.nightly;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = null;
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {
// Make HTTP connection
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
Log.i("Input stream >> ", is.toString());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
Log.i("JSON string builder >> ", json.toString());
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
try {
jObj = new JSONObject(json.substring(1, json.length()));
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jObj;
}
}
错误是：at notes of type org.json.JSONObject cannot be converted to JSONArray
在列表视图中显示 json 的代码是：
package ir.mohammadi.android.nightly;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class AllNotes extends ListActivity {
ProgressDialog pDialog;
ArrayList<HashMap<String, String>> noteList;
JSONArray notes = null;
JSONObject jSon = null;
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR_MSG = "error_message";
private static String KEY_NOTE_ID = "note_id";
private static String KEY_NOTE_SUBJECT = "note_subject";
private static String KEY_NOTE_DATE = "note_date";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.note_list);
noteList = new ArrayList<HashMap<String, String>>();
new LoadAllNotes().execute();
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String note_id = ((TextView) view
.findViewById(R.id.list_lbl_id)).getText().toString();
Intent i = new Intent(getApplicationContext(), NoteDetail.class);
i.putExtra("note_id", note_id);
startActivityForResult(i, 100);
}
});
}
public class LoadAllNotes extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllNotes.this);
pDialog.setMessage("لطفا صبر کنید...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... args) {
UserFunctions userFunctions = new UserFunctions();
jSon = userFunctions.getAllNotes("12");
Log.i("AllNotes >> jSon >>", jSon.toString());
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
try {
if (jSon.has(KEY_SUCCESS)) {
String success = jSon.getString(KEY_SUCCESS);
if (success.equals("1")) {
notes = jSon.getJSONArray("notes");
for (int i = 0; i < notes.length(); i++) {
JSONObject c = notes.getJSONObject(i);
String id = c.getString(KEY_NOTE_ID);
String subject = c.getString(KEY_NOTE_SUBJECT);
String date = c.getString(KEY_NOTE_DATE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_NOTE_ID, id);
map.put(KEY_NOTE_SUBJECT, subject);
map.put(KEY_NOTE_DATE, date);
noteList.add(map);
}
}
} else {
finish();
Toast.makeText(getApplicationContext(),
jSon.getString(KEY_ERROR_MSG), Toast.LENGTH_SHORT)
.show();
Log.i("AllNotes >> No nightly >>", "...");
Intent i = new Intent(getApplicationContext(), login.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(AllNotes.this,
noteList, R.layout.list_item, new String[] {
KEY_NOTE_ID, KEY_NOTE_SUBJECT,
KEY_NOTE_DATE }, new int[] {
R.id.list_lbl_id, R.id.list_lbl_subject,
R.id.list_lbl_date });
setListAdapter(adapter);
}
});
}
}
}
php代码是：
public function getNotesList($user_id)
{
$result = mysql_query("SELECT `id`, `note_subject`, `note_date` FROM `tbl_notes` WHERE `user_id` = '$user_id'");
if (mysql_num_rows($result) > 0) {
$response = array();
$response["success"] = "1";
$response["notes"] = array();
while ($row = mysql_fetch_array($result)) {
$note = array();
$note["note_id"] = $row["id"];
$note["note_subject"] = $row["note_subject"];
$note["note_date"] = $row["note_date"];
array_push($response["notes"], $note);
}
return $response;
}
}
和
if ($tag == 'getNotesList') {
$user_id = $_POST['user_id'];
$result = $db->getNotesList($user_id);
if ($result) {
error_log("Index getNotesList Json >>" . json_encode($result) . "\r\n", 3,
"Log.log");
echo json_encode($result, JSON_FORCE_OBJECT);
} else {
$response["error"] = "1";
$response["error_message"] = "no row";
echo json_encode($response, JSON_FORCE_OBJECT);
}
}
我怎样才能解决这个问题？谢谢。