java AsyncTask#1执行DoinBackground时出错
每当我将我的URL更改为我的在线主机时，我都会遇到这个错误，但是如果我更改为10.0.2.2，一切都会正常运行
LogCat
02-01 23:02:18.302 17643-18052/com.example.jithea.testlogin E/JSON Parser﹕ Error parsing data org.json.JSONException: Value <br><table of type java.lang.String cannot be converted to JSONObject
02-01 23:02:18.303 17643-18052/com.example.jithea.testlogin W/dalvikvm﹕ threadid=12: thread exiting with uncaught exception (group=0x40d8d9a8)
02-01 23:02:18.303 17643-18052/com.example.jithea.testlogin W/dalvikvm﹕ threadid=12: uncaught exception occurred
02-01 23:02:18.304 17643-18052/com.example.jithea.testlogin W/System.err﹕ java.lang.RuntimeException: An error occured while executing doInBackground()
02-01 23:02:18.304 17643-18052/com.example.jithea.testlogin W/System.err﹕ at 安卓.os.AsyncTask$3.done(AsyncTask.java:299)
02-01 23:02:18.304 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
02-01 23:02:18.305 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
02-01 23:02:18.305 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:239)
02-01 23:02:18.305 17643-18052/com.example.jithea.testlogin W/System.err﹕ at 安卓.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
02-01 23:02:18.305 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
02-01 23:02:18.306 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
02-01 23:02:18.306 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.lang.Thread.run(Thread.java:838)
02-01 23:02:18.306 17643-18052/com.example.jithea.testlogin W/System.err﹕ Caused by: java.lang.NullPointerException
02-01 23:02:18.306 17643-18052/com.example.jithea.testlogin W/System.err﹕ at com.example.jithea.testlogin.NewsActivity$LoadAllProducts.doInBackground(NewsActivity.java:132)
02-01 23:02:18.306 17643-18052/com.example.jithea.testlogin W/System.err﹕ at com.example.jithea.testlogin.NewsActivity$LoadAllProducts.doInBackground(NewsActivity.java:107)
02-01 23:02:18.307 17643-18052/com.example.jithea.testlogin W/System.err﹕ at 安卓.os.AsyncTask$2.call(AsyncTask.java:287)
02-01 23:02:18.307 17643-18052/com.example.jithea.testlogin W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:234)
02-01 23:02:18.307 17643-18052/com.example.jithea.testlogin W/System.err﹕ ... 4 more
02-01 23:02:18.307 17643-18052/com.example.jithea.testlogin W/dalvikvm﹕ threadid=12: calling UncaughtExceptionHandler
02-01 23:02:18.315 17643-18052/com.example.jithea.testlogin E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at 安卓.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at 安卓.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:838)
Caused by: java.lang.NullPointerException
at com.example.jithea.testlogin.NewsActivity$LoadAllProducts.doInBackground(NewsActivity.java:132)
at com.example.jithea.testlogin.NewsActivity$LoadAllProducts.doInBackground(NewsActivity.java:107)
at 安卓.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at 安卓.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:838)
02-01 23:02:18.371 17643-17659/com.example.jithea.testlogin I/SurfaceTextureClient﹕ [STC::queueBuffer] (this:0x528dc150) fps:43.08, dur:1044.57, max:73.51, min:6.02
这是我的NewsActivity.java
public class NewsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParserNews jParser = new JSONParserNews();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://agustiniancampusevents.site40.net/newsDB/get_all_news.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_NEWS = "news";
private static final String TAG_PID = "pid";
private static final String TAG_NEWSTITLE = "newstitle";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
ViewNewsActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
*/
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(NewsActivity.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
*/
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_NEWS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String newstitle = c.getString(TAG_NEWSTITLE);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NEWSTITLE, newstitle);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
ViewNewsActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* *
*/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
NewsActivity.this, productsList,
R.layout.news_list_item, new String[]{TAG_PID,
TAG_NEWSTITLE},
new int[]{R.id.pid, R.id.newstitle});
// updating listview
setListAdapter(adapter);
}
});
}
}
}
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