Android :: ProgressDialog In AsyncTask Throws An Exception
Jun 25, 2010
I'm trying to make a simple ProgressDialog appear while my AsyncTask is fetching data. In my onPreExecute() method I have this: pd = ProgressDialog.show(c, "Loading...", "Please wait");
c is the context passed into the constructor of my AsyncTask from this.getApplicationContext(). Unfortunately, I keep getting an exception with this message: Unable to add window -- Token null is not for an application
What am I doing wrong?
Using this instead of this.getApplicationContext() has revealed another problem. When I call ProgressDialog.show(..., a ProgressDialog is displayed, but not until after the AsyncTask has completed. In other words, the data loads and then the dialog is displayed. If I include pd.dismiss() in my onPostExecute() then I never even see the dialog (presumable because it is closed before it ever gets opened).
It turns out that fetch.get() was hogging the UI thread and not letting the ProgressDialog display.
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Jul 27, 2010
What I want is just to have the AsyncTaskTask showing a progressbar an external class. To do this I am passing the context as you can see in the main class. But whatever I try I get NullPointerException.
Working code examples.
Using Android 2.2 by the way.
main:
CODE:............
Update:
I have a follow up question: Using the above code, is it possible to return a value from the onPostExecute method back to the main class, somehow? (Sorry about beeing noobish)
I have tried something like this:
String result = new AsyncClass(this).execute();
and then a method that return back a string. But I can't do that because i got:
Type mismatch: cannot convert from AsyncTask<String,Void,Void> to String
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Oct 8, 2010
I am developing my first Android App and I need a ProgressDialog to be showed while a background task, in this case just a http call on the server, happens.
I did a bit of studying on this and also have already checked other threads related to this subject.
http://developer.android.com/reference/android/os/AsyncTask.html
[url]
[url]
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Among others.
Than I got to write a bit of code:
1) In My Activity I declare a variable to be of type ProgressDialog
code:............
2) I have also written an inner class to extend AsyncTask as required, here in the doInBackGround is where I call a static method which actually do the POST http request to the server, in the server side I have blocked the server response 20s to validate the progress dialog.
code:............
3) When the button is pressed I than build the ProgressDialog anc call the AsyncTask I have created:
code:...................
Well, this is it, I believe this was suppose to show a progress dialog while the AsyncTask would query the server in background, but what I get is NO progress bar until server response arrives and than for a fraction of time(less than 1 second) the progress shows and the next Activity is called.
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Oct 17, 2010
CODE:......................
I get the following exception when trying to use the isUserAMonkey API on a keydown. mAM = (android.app.ActivityManager)getSystemService(Context.ACTIVITY_SERVICE); if (mAM.isUserAMonkey()) {return true;} Any reason why this may be happening?
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Oct 7, 2010
I have a ListView that I'm binding to an adapter. The adapter is a protected member of my main class. I have a listener thread that receives data and updates the source list for my adapter. When I call the adapter's notifyDataSetChanged() method, an exception is thrown:
Runtime Exception: PhoneLayoutInflater(LayoutInflater).inflate(int, ViewGroup, boolean) line: 322
I've read that the notifyDataSetChanged() method has to be called on the UI thread, and I'm doing that. In fact, just to be sure, I even update the ListView's data source on the UI thread. All I do in my listener thread is update a protected member that houses the data. Here's an example of what I'm doing (note that I don't have the part of the code that calls the AsyncTask, but it's fired from a listener):
CODE:............
Does anyone have any pointers or ideas as to why I'm getting this exception? Any help is much appreciated.
Here are the layout files, as requested:
main.xml:
CODE:....................
row.xml:
CODE:...............................
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Sep 17, 2010
I've got a probleme with an exception, but I don't know why I get this exception.
The project is about implementing an AbstractAccountAuthenticator with an AbstractThreadedSyncAdapter to sync certain data on a server with a content provider.
I made everything and both adding accounts and syncing is running without any problems.
Now I've tried to add a Preference-Screen just like suggested in the android reference (search for AbstractAccountAuthenticator, it is explained there) via xml like this:
autenticator.xml:
CODE:..........
The Preference-Screen-xml looks like this:
CODE:.....................
The screen is promted how it should be, but and that is the problem: When I click on the PreferenceScreen with the intent it leads to a crash of the system (both in the emulator and my HTC-Desire).
Logcat says:
CODE:..............
Here the part of the manifest, where the activity is defined:
CODE:.......
The whole test-code (it is my project on the essentials to find the problem) is to find at googlecode (http://code.google.com/p/ cleanproject/source/browse/) (Eclipse-Project)
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Jul 11, 2010
I have developed simple application of progress bar in that when I hit the button then it will do some work in background and one progress bar is visible on foreground. afte completing back ground work it display the same screen. It works fine if I don't rotate mobile but when I rotate mobile then it throws java.lang.IllegalArgumentException: View not attached to window manager
I know when we rotate the device or open keypad it starts activity restarted. But How to avoid this error. My code is.
CODE:..........................
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Jul 31, 2010
I have two projects in Eclipse: service and UI client.
In onCreate in UI client I have:startService(new Intent(this, ExampleService.class));
But this fragment: ExampleService.class throws NoClassDefFoundError exception at runtime. I have installed ExampleService.apk, and ExampleUiClient.apk. Project compiles, and everything looks fine. What I am doing wrong?
Is it possible to start service from other apk?
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Mar 30, 2010
I am having this problem with the android database. I adopted the DBAdapter file the NotepadAdv3 example from the google android page.
CODE:...........
The error that i am receiving is from Log.e(TAG, e.toString()) in the methods retrieveKey() and storeKey() "no such table: myuserkey: , while compiling: SELECT userkey FROM myuserkey"
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Sep 4, 2010
I have class A in which I have a method openfileConnec().
It was written like the below:
CODE:...............
Now I come to class B where I will call this method like the below:
CODE:.............
I was asked a question in an interview as follows:
Why does the method have a throws Exception in its declaration? Is it that on of the methods called in the implementation throws the base class exception? Also If we get a exception during calling the method (fileConnect( )) control goes to catch block. After executing catch where should the control go, what should be sent to base case?
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Sep 20, 2010
I have a Thread that downloads data from internet
CODE:..........................
There is an activity that needs to be updated according to downloaded data.
CODE:............................
Whenever I run above code I get NullPointer Exception .Please help me to update the view.
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Nov 24, 2009
I'm testing how my app behaves when killed by the OS due to low memory conditions. I always have three activities on the stack, like: A B C (then C launches maps or some other heavy process)
when my app is killed, and I return to it, C starts itself up again ok. When I hit the back button to go to B, I [sometimes] get an exception thrown which I can't trace. Output is below. I don't know where to go from here. I've only seen one other post mentioning this exception, but it was related to a reproducable error when rotating the device. This only happens sometimes.
CODE:....................
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Aug 18, 2010
I am facing an issue with AsynsTask in my Application. I really do not understand the reason of it happening.
The issue is "The application works perfectly usually, now when any of the activity is displayed on the screen and I keep my device idle for a longer period of time. Then when I make the keyguard on the view of the last active activity is displayed to me. But as soon as I click on any component below mentioned exception is thrown. If the device is not kept for a longer period of time then there is no problem as such. The application makes http connection in onResume of most of the activities. I did this since every time the user comes to particular view then he should get the updates lists of posts from the webservice"
CODE:................
Let me know the reason behind this error and any solution to this?
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Aug 18, 2009
AsyncTask blocks exceptions? Please see the below code. My "getOffersStatus" function catches certain exceptions and show them in a AlertDialog. But instead of getting my custom exceptions message I get default error dialog "The application ... has stopped unexpectdly. Please try again".
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Aug 13, 2010
I am using AsyncTask in my application.
The problem is that when server is down the AsyncTask throws an Interrupted exception. How to track that whether server is down or not.
CODE:.........
This same problem also occurs when the handset is kept idle for some time then keyguard gets lock and I suppose that WI-FI also gets disabled. So, when I enable the keyguard and if my application is in foreground then it gives the same exception. What should I do in order to remove this exception?
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Jul 28, 2010
I'm trying to figure out the correct way to create an AsyncTask to retrieve some data from the internet and then to take that data and bundle it up in an Intent and pass it to a new activity(A list display). So in the first activity I just have an EditText and Button. In the event of an OnClick the task should be called and when it is finished the data should be bundled inside an Intent and passed to the next Activity. The problem is when I take the results from onPostExecute and set them to an instance variable of the main activity, that instance variable is still null when the task is complete. Here is the barebones version of the code:
CODE:...........
When I debug the application I see onPostExecute does contain a valid PlacesList full of results, so why is the instance variable places set to null after the task is executed? I am going about "returning data" from an AsyncTask incorrectly?
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Jul 14, 2010
I created a sql lite database with the following columns:
static final String dbName="demoDB";
static final String tableName="Employees";
static final String colID="EmployeeID";
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+tableName+" ("+colID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer);");
I want to select all the records in the database like this and display them in a gridview:SQLiteDatabase db=this.getWritableDatabase();Cursor cur= db.rawQuery("Select "+colName+", "+colAge+" from "+tableName, new String [] {});String [] from=new String []{DatabaseHelper.colName,DatabaseHelper.colAge};
int [] to=new int [] {R.id.colName,R.id.colAge};
SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
GridView grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(sca);but i receive the following exception:java.lang.IllegalArgumentException: column '_id' does not exist.the db table does not have a column with name '_id'so what is wrong with this code
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Nov 18, 2009
In the following code, these lines:
CODE:.........
The app keep throws the Rescources.NotFoundException. I checked the xml file, all the ids are defined and they are all in the R.java. So I really don't know why the app throw this exception.
CODE:.......................
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Apr 30, 2009
I would like to do some tests on SlidingDrawer however i always found RuntimeException when SlidingDrawer.onMeasure is called i check the code and think the exception is caused by unspecified MeasureSpec
so i would like to ask how to setup the MeasureSpec in SlidingDrawer?
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Aug 26, 2010
I have recently noticed that when Running the function geoCoder.getFromLocationName() on android 2.2 (Froyo) then i Receive a IOExeption (Which does not occur on other SDK versions).
After some reserch i have found suggentions to add the following Permisions:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
However this does not solve the problem, and this appears to be a Android SDK Bug.
Is there a knows solution to this problem?
Here is the stack trace though it is not particularly helpful the inner stack trace is null so not great.
CODE:.......................
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Jul 1, 2010
My XML layout in res/layout/edit.xml: Code...
When I try to switch from "edit.xml" to "Layout", I see this error: java.lang.UnsupportedOperationException: addView(View, LayoutParams) is notsupported in AdapterView I checked the documentation for AdapterView, and this is expected behavior. Why, then, does ADT expect it to work?
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Dec 10, 2009
Is there someone troubled the same issue.
The code in run.
CODE:.............
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Jan 25, 2010
I have an android application that I am supporting and after calling one of the activities numerous time, it throws a stackoverflowerror when trying to get the extras from the intent. Here is the the stack trace from when it crashes. Any ideas as to why after calling the activity at least 4 times the next time throws StackOverflowError when getting the extras from the intent?
The code used to build the intent is and contains String, String, boolean, Object:
CODE:....................
And the code that is throwing the StackOverflowError is:
CODE:.........................
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Jul 22, 2010
I have a listview. Whenever I strike an item of listview the debugger gets opened instead of starting a new activity (i.e. what I want). Code...
P.S. all the xml files are correct.
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Aug 31, 2009
I am using HttpURLConnection to send a GET request to a server. Upon reading the response code, the Android implementation of HttpURLConnection.doRequestInternal() throws an exception:
"java.io.IOException: Received authentication challenge is null"
I don't even get what the error is trying to tell me. I write an OAuth param string to the Authorization header, but this works fine on other occasions. There is nothing peculiar about my request apart from that.
Any idea what this means, what is causing this and how to get around it? This works fine with Sun's Java implementation, so I guess it's a problem with Apache Harmony?
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Jun 17, 2010
I try to show a ProgressDialog at the beginning of my application from an Activity. I debug the application and in theory the dialog is created because it prints a line from onCreateDialog... method.
For more test, I try to show a toast with:
Toast.makeText(MyActivity.this, "test", Toast.LENGTH_LONG);
And nothing is showed.
If is useful, the application is a widget.
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Oct 12, 2009
I'm starting a ProgressDialog using:
ProgressDialog.show(Example.this, " " , " Loading. Please wait ... ", true,true);
Then running a block of code to download and parse XML.
The problem I'm having is that this is all running under a onClick button method, and that the xml is downloaded and parsed before the dialog is shown.
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May 9, 2010
I'm trying to create a ProgressDialog for an Android-App (just a simple one showing the user that stuff is happening, no buttons or anything) but I can't get it right. I've been through forums and tutorials as well as the Sample-Code that comes with the SDK, but to no avail.
This is what I got:
CODE:..........
I've also tried adding pd.show(); and messed around with the parameter in new ProgressDialog resulting in nothing at all (except errors that the chosen parameter won't work), meaning: the ProgressDialog won't ever show up. The app just keeps running as if I never added the dialog.
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Oct 16, 2010
I just tried to implement a progressdialog and I have some issues to change the text during my long and complex calculations.
CODE:..........
I can clearly see the incrementProgressBy working and my dialog updating, but the message does not change.
Any idea on how to make that work?
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Mar 7, 2010
I have a context menu option that, when clicked, will load some information from the web and insert it into a database.So this is a lengthy process and I would like to display a progressdialog over the top of the context menu when this option is selected.I've got the progressdialog running now, but it won't show up.It's almost like the context menu is covering it.So is there a way that I could get the progressdialog to show up on top of the context menu and be visible to the user.
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