我在从本地服务器解析json时遇到了麻烦。
我的代码看起来像这样。
--MainActivity--
package com.mihajlo.http;
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.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class MainActivity extends ListActivity {
private Context context;
private static String url = "http://10.0.2.2:8080/pnrs1/?CommandMsg=StudentsByGroup&MsgParam=31";
private static final String Name = "name";
private static final String Index = "index";
private static final String Year = "year";
ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new ProgressTask(MainActivity.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog;
private ListActivity activity;
public ProgressTask(ListActivity activity) {
this.activity = activity;
context = activity;
dialog = new ProgressDialog(context);
}
private Context context;
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
ListAdapter adapter = new SimpleAdapter(context, jsonlist,
R.layout.list_item, new String[] { Name, Index, Year },
new int[] { R.id.name_id, R.id.index_id, R.id.year_id });
setListAdapter(adapter);
// single item View
lv = getListView();
}
@Override
protected Boolean doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
// get JSON data from URL
JSONArray json = jParser.getJSONFromUrl(url);
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String name = c.getString(Name);
String index = c.getString(Index);
String year = c.getString(Year);
HashMap<String, String> map = new HashMap<String, String>();
// Add strings to HashMap ("key","value")
map.put(Name, name);
map.put(Index, index);
map.put(Year, year);
jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
}
}
--JSONParser--
package com.mihajlo.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream iStream = null;
static JSONArray jarray = null;
static String json = "";
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("TAG", "Faild to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Parse String to JSON object
try {
jarray = new JSONArray(builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data" + e.toString());
}
// return JSON Object
return jarray;
}
}
我收到像这样的错误=＆gt;
05-11 11:57:00.651: E/WindowManager(2653): Activity com.mihajlo.http.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40cf0b50 V.E..... R.....ID 0,0-456,144} that was originally added here
05-11 11:57:00.651: E/WindowManager(2653): android.view.WindowLeaked: Activity com.mihajlo.http.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40cf0b50 V.E..... R.....ID 0,0-456,144} that was originally added here
05-11 11:57:00.651: E/WindowManager(2653): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
05-11 11:57:00.651: E/WindowManager(2653): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
05-11 11:57:00.651: E/WindowManager(2653): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.Dialog.show(Dialog.java:281)
05-11 11:57:00.651: E/WindowManager(2653): at com.mihajlo.http.MainActivity$ProgressTask.onPreExecute(MainActivity.java:60)
05-11 11:57:00.651: E/WindowManager(2653): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
05-11 11:57:00.651: E/WindowManager(2653): at android.os.AsyncTask.execute(AsyncTask.java:534)
05-11 11:57:00.651: E/WindowManager(2653): at com.mihajlo.http.MainActivity.onCreate(MainActivity.java:42)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.Activity.performCreate(Activity.java:5104)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-11 11:57:00.651: E/WindowManager(2653): at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 11:57:00.651: E/WindowManager(2653): at android.os.Looper.loop(Looper.java:137)
05-11 11:57:00.651: E/WindowManager(2653): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-11 11:57:00.651: E/WindowManager(2653): at java.lang.reflect.Method.invokeNative(Native Method)
05-11 11:57:00.651: E/WindowManager(2653): at java.lang.reflect.Method.invoke(Method.java:511)
05-11 11:57:00.651: E/WindowManager(2653): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-11 11:57:00.651: E/WindowManager(2653): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-11 11:57:00.651: E/WindowManager(2653): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)