getting this error in logcat
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): FATAL EXCEPTION: AsyncTask #1
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): java.lang.RuntimeException: An error occured while executing doInBackground()
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.os.AsyncTask$3.done(AsyncTask.java:200)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.lang.Thread.run(Thread.java:1096)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.os.Handler.<init>(Handler.java:121)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.app.Dialog.<init>(Dialog.java:101)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.app.AlertDialog.<init>(AlertDialog.java:63)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.app.AlertDialog.<init>(AlertDialog.java:59)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.app.AlertDialog$Builder.create(AlertDialog.java:786)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at com.UserLogin.UserLogin$CheckUser.doInBackground(UserLogin.java:198)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at com.UserLogin.UserLogin$CheckUser.doInBackground(UserLogin.java:1)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at android.os.AsyncTask$2.call(AsyncTask.java:185)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-15 14:38:09.944: ERROR/AndroidRuntime(1065): ... 4 more
AsyncTask Code
private class CheckUser extends AsyncTask<String, Void, Void> {
private AlertDialog AD1;
@Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
HttpClient httpclient = new DefaultHttpClient();
// Dh.getWritableDatabase();
HttpPost httppost = new HttpPost(url);
List<NameValuePair> params1 = new ArrayList<NameValuePair>(2);
params1.add(new BasicNameValuePair("username", Username));
try {
httppost.setEntity(new UrlEncodedFormEntity(params1));
Log.i("Params",EntityUtils.toString(new UrlEncodedFormEntity(params1)));
HttpResponse responseGet = httpclient.execute(httppost);
HttpEntity entity = responseGet.getEntity();
if (entity != null) {
InputStream inputStreamResponse = entity.getContent();
result = convertStreamToString(inputStreamResponse);
System.out.println(result);
db = InsertData.getWritableDatabase();
ContentValues values = new ContentValues();
MyUserJsonObject = new JSONObject(result);
JSONObject menuObject = MyUserJsonObject.getJSONObject("UserDetails");
attributeId = menuObject.getString("login");
System.out.println(attributeId);
if (attributeId.equals("success")) {
JSONObject FriendObject = menuObject.getJSONObject("friendslist");
JSONArray FriendArray = FriendObject.getJSONArray("friends");
for (int i = 0; i < FriendArray.length(); i++) {
values.put(DatabaseHelper.FriendName, FriendArray.getJSONObject(i).getString("FriendName").toString());
values.put(DatabaseHelper.FriendMobile, FriendArray.getJSONObject(i).getString("Mobile").toString());
db.insert(DatabaseHelper.FRIENDTABLE, null, values);
}
values.clear();
JSONObject PlaceObjet = menuObject.getJSONObject("findplaces");
JSONArray PlacesArray = PlaceObjet.getJSONArray("places");
for (int i = 0; i < PlacesArray.length(); i++) {
values.put(DatabaseHelper.Name, PlacesArray.getJSONObject(i).getString("Name").toString());
values.put(DatabaseHelper.Image,PlacesArray.getJSONObject(i).getString("Image").toString());
db.insert(DatabaseHelper.LOCATIONTABLE, null,values);
}
values.clear();
db.close();
// System.out.println(friendslist);
} else {
dialog1.dismiss();
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
AlertDialog ADl = new AlertDialog.Builder(
getApplicationContext()).create();
ADl.setTitle("Login Failed..");
ADl.setMessage("You have Entered Wrong Username/Password Please try again");
ADl.setIcon(R.drawable.oops);
ADl.setButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel();
}
});
ADl.show();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
dialog1.dismiss();
if(attributeId.equals("success")){
Intent innerintent = new Intent(getApplicationContext(),Innerpage.class);
startActivity(innerintent);
} else {
dialog1.dismiss();
TextView Tv=(TextView)findViewById(R.id.error);
Tv.setText("Please Enter Valid Username/password");
}
if(attributeId.equals("success")){
Intent innerintent = new Intent(getApplicationContext(),Innerpage.class);
startActivity(innerintent);
} else {
AD1= new AlertDialog.Builder(getApplicationContext()).create();
ADl.setTitle("Login Failed.."); ADl.setMessage("You have Entered Wrong Username/Password Please try again");
ADl.setIcon(R.drawable.oops); ADl.setButton("Ok", new
DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which)
{ //TODO Auto-generated method stub
dialog.cancel();
}
});
}
ADl.show();
}
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
dialog1 = ProgressDialog.show(UserLogin.this, "","Please wait for few seconds...", true);
dialog1.show();
}
}
You are trying to build an AlertDialog inside the doInBackground method of your asynctask.
You can’t do that unless you first prepare a looper or something (which is complex).
Instead, create your AlertDialog either in the onProgressUpdate or onPostExecute method, or in a Runnable that runs on the UI thread (via runOnUIThread, for example)