Android :: Returning Data From AsyncTask Resulting In Null Pointer Error
Jul 20, 2010
I am trying to do what I think is a fairly simple task to authenticate a user on my server. I am using AsyncTask as a private subclass of my Activity, however when I try to populate the user object after authenticating it keeps setting it to null. Is there something strange in how the onPostExecute() method is called that is causing this? I originally had the AsyncTask as its own class but ran into the same problem, so I am try to solve this using a private subclass.
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Oct 5, 2010
The line "return db.insert(DATABASE_TABLE, null, initialValues);" is returning a null pointer and I cant figure out why! I'd be grateful for any help public class Database extends Activity {
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DBAdapter db = new DBAdapter(this);
if(db != null){
long id = db.insertUser("test", "test");
Cursor c = db.getUser(id);
Log.d("DB", c.getString(1));
Log.d("DB", c.getString(2)); db.close();.......
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Mar 16, 2010
How I'm able to do what I've written in the topic. I've looked through many tutorials on AsyncTask but I can't get it to work. I have a little form (EditText) that will take what the user inputs there and make it to a url query for the application to lookup and then display the results.
What I think would seem to work is something like this: In my main activity i have a string called responseBody. Then the user clicks on the search button it will go to my search function and from there call the GrabUrl method with the url which will start the asyncdata and when that process is finished the onPostExecute method will use the function activity.this.setResponseBody(content).
This is what my code looks like simpliefied with the most important parts (I think).
CODE:.......................
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Oct 31, 2009
An error that appeared in my Flurry logs but seemed impossible to reproduce otherwise just occured That's the good news.The bad news is that the LogCat info is not telling me enough.I would appreciate a second set of eyes taking a look and offering wisdom.The lead up is that I was playing with my app, and put it away for a while. I did a lot of other things with my phone since, like making phone calls, etc I hooked up my phone to the computer to make another attempt to find the mystery bug, and decided to see if anything weird appeared in the logs from earlier.I then brought my app to the foreground using the Home/Hold technique and whamo the bug appeared before my eyes in LogCat.
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Oct 26, 2010
I am trying to create a file ,if it doesnot exist and tried to write some data to it. The same program I did in java, it was running fine.But when I try to do the same thing in Android I am getting NullPointerException at the place where I am trying to write data to file. And also, I did not find any new file in the current directory .
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Aug 31, 2010
When I view the following xml file in the layout view (eclispse), I got NullPointerException:null message, but when I run the code, it works.
CODE:..............
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Nov 16, 2010
I think this should be easy to answer. I have an application that does some long calculations, and I would like to show a progress dialog while this is done. So far I have found that I could do this with threads/handlers, but didn't work, and then I found out about the AsyncTask.In my application I use maps with markers on it, and I have implemented the onTap function to call a method that I have defined. The method creates a dialog with Yes/No buttons, and I would like to call an AsyncTask if Yes is clicked. My question is how to pass an ArrayList to the AsyncTask (and work with it there), and how to get back a new ArrayList like a result from the AsyncTask?
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Jun 15, 2010
I'm working on an application where I want to add adWhirl to manage adds. The app is working fine until I tryed to use adWhirl. I have try to get the view created with setContentView(R.layout.main) by calling LinearLayout layout.
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May 31, 2010
I'm writing an android program in which I have an activity that uses tabs.Anybody have any idea how I can get this content into a tab without crashing my application? My actual program is more complex and has more than one tab but I simplified it down to this in an attempt to find out why it's crashing but it still crashes and I don't know why.If I don't use LayoutInflator my program doesn't crash but I don't get any content either, just tabs.
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Apr 1, 2010
I'm installing the Android SDK on Mac OS X. Following the instructions on the Android Development site, I've downloaded the SDK and modified my .bash_profile to include the path. The next step is to use the Android SDK and AVD Manager to actually download the platforms.
However, when I use the Manager to install the platforms, I get the following error in the Terminal. I've looked around for similar problems in the Eclipse and Android forums and haven't found anything yet. Is something else damaged in the environment and needs to be repaired? Any recommendations on where I should look? Code...
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Sep 22, 2010
Looks like reverseGeocode ( getFromLocation()) is not working in android 2.2. It is not able to fetch the address from the coordinates. It returns null and crashing my app.
In general 2.2 is not stable - 2.1 was much better. UI response , UI rotation when rotate the phone etc doesn't work reliably....
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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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Sep 4, 2009
I am receiving Text messages from another application sent through broadcast intent. I am displaying these messages to my application's GUI. In my application I had defined <broadcast receiver> in my manifest.xml
<receiver android:name=".HHBroadcastReceiver">
<intent-filter>
<action android:name="android.demo.test"/>
</intent-filter>
</receiver>
And also define the logic in the Broadcast receiver class
public class HHBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { //TODO: React to the Intent received.
String msg_receive = intent.getStringExtra("message1");
AssetTest.hh_text.append("
"+msg_receive); } }
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Sep 28, 2010
I need to disply current Position latitude and logintude...I tried but it will show Null pointer exception.. here with i attached my code...
I run this application on android emulator
CODE:...............
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Apr 23, 2010
I cant figure out why my program is showing null pointer exception. Plz help me.I have declared the getter and setter methods in a seperate claa named SongsList. Plz help me determine the problem...
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Nov 21, 2010
I have a null pointer on a button that I need to take me to a new layout when pushed. I have the code set as:
((Button) findViewById(R.id.analyzee)).setOnClickListener(btnClick); inside a method that uses conditional statements. It is a basic face detect app. If faces are not found, I do this:
if (facesFound < 1) {
mFlipper.setDisplayedChild(2);
mTheMessage = (TextView) findViewById(R.id.falsemessage);
mThePicture = (ImageView) findViewById(R.id.false_view);
mTheMessage.setText(R.string.noFaceOne);
mThePicture.setImageBitmap(bitmap565);
return;
if faces are found, I draw a box on the face, and do this: Code...
So, my issue lies in this: In one of my layouts in the flipper, the button that rests on the layout will need to give the user the option to snap a new picture if there are no faces found. The other layout will need the button (upon click) to have the faces cropped and the results to be sent to another layout.
The issue I am facing is where the code: ((Button) findViewById(R.id.crop_face)).setOnClickListener(btnClick);
needs to be placed in order for the program to release the button has been clicked, it calls the case in my switch statement, and runs the crop face_method.
I try putting it in the if statement where I set the image View and text View, but I get a null pointer on that line I am declaring my button on.
The buttons I have on my main menu work fine, as they are in my onCreate method, but I don't know where to play this button command, and also where I need to place my reopen Camera command.
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Sep 8, 2009
I'm trying to get a location from lat /lon values with the getFromLocation function:
adresses = geocoder.getFromLocation(lat, lon, 1); // Search addresses
The function should return a empty List, if it don't find an address, but it throws the NullPointerException. What can/must I do to fix it?
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Nov 16, 2009
I've had fine luck using SQLite with straight, direct SQL in Android, but this is the first time I'm wrapping a DB in a ContentProvider. I keep getting a null pointer exception when calling getWritableDatabase() or getReadableDatabase().
Is this just a stupid mistake I've made with initializations in my code or is there a bigger issue?
CODE:.........
But here's LogCat showing the exception:
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Sep 23, 2010
When my app loads, I fill my android.app.Application with some data. The app runs fine as I use it and all the data is available. However, when I leave the app over night and look at it again the next day, I receive NullPointerExceptions when attempting to use that same data. I do not believe Application objects get garbage collected, so I have no idea what is going on? I also lose static objects in classes used by my Activity classes. I am on Froyo 2.2 on a Google Nexus One. Looks like someone else had a similiar issue: http://groups.google.com/group/android-developers/browse_thread/threa...
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Feb 11, 2010
While building the android app using ant am getting the following exception. Couldn't figure out why these exception are thrown! Code...
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Feb 9, 2010
I have been following the Android getting started docs and when I try to run the project I get: !MESSAGE An internal error occurred during: "Launching HelloAndroid". Code...
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Nov 12, 2010
I have the following very simple class which looks for the last known user coordinates and then prints one of them. But I am getting loc as null variable. That is the application is not reading the data into the loc variable. Still it doesn't fire any toast command in the function. Code...
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Jun 2, 2010
My web service should be returning an integer, but every time i run the code i get the NullPointerException error. i think my url string may be the problem, but i've tried using my ip with no luck. Code...
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Jul 26, 2010
I am using the previewCallback from the camera to try and grab images. Here is the code I am using
private Camera.PreviewCallback mPrevCallback = new Camera.PreviewCallback()
{
public void onPreviewFrame( byte[] data, Camera Cam ) {
Log.d("CombineTestActivity", "Preview started");
Log.d("CombineTestActivity", "Data length = "
+ data.length );
currentprev = BitmapFactory.decodeByteArray( data, 0,
data.length );....................................
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Sep 16, 2009
I have created a simple driver to implement mmap and an application program to uses the sys call mmap and tries writ/read data. The mmaped area is the RAM.(I am working on beagle board) This works fine when I execute my application program through the shell/console but fails (with the following error) to work when executed through an apk. Unable to handle kernel NULL pointer dereference at virtual Code...
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Jul 31, 2010
I am trying to create a simple 3-D app for android that will have an additional view layered on top of the OpenGL view (much like the SurfaceViewOverlay example in the API demos). I'm running into an issue trying to implement that method with an extended GLSurfaceView class. I've set up an example where I'm trying to do a combination of this demo with the API Oerlay demo. If I try to cast to a Martin's VortexView object like this (replace lines 44-46 in the API demo) I get a ClassCastException error (which is understandable, as I assume casting is fairly specific) so I guess I'm looking for a method to transfer the view from a GLSurfaceView instance to a new subclass or a way to set the rendering surface to an XML defined view for a subclass after it has been created. it will do the casting correctly with the above code but generates Null Pointer Exceptions when it hits the surfaceCreated and surfaceChanged routines (I think it's the called methods in the GLThread class based on the line number) inside the GLSurfaceView class. So maybe I should change the question- How can I implement an extension for GLSurfaceView without generating NullPointerExceptions on surfaceCreated and surfaceChanged, or how can I debug them without having the source for GLSurfaceView.java? Code...
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Oct 27, 2010
I looked at the 2 examples on Stack, but can't get them to work. I'm simply trying to grab an image from a folder in assets and set it as in ImageView, but get a null pointer returned.
Main Activity:
CODE:...........
And my two xml files:
CODE:...........
Also tried this, but still get a file not found exception.
CODE:.......................
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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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Jul 27, 2010
I have built an activity to handle gestures in my Android game and want it to respond to a gesture anywhere on the screen but I am getting this error on the Log:
CODE:...............
I understand I need to allocate a view to the activity and as you will see in my XML, a view called gestures will serve this purpose but I keep getting Inflation errors when trying to inflate the view. Before when this happened to me it was a misspelling of the view name in the XML but that's not it this time I don't think.
How would I properly assign the 'gesture' view to this activity to prevent the errors?
I have defined my activity in my code like this:
CODE:...............
I have created the activity in the main thread in it's doStart() method by saying:
CODE:............
And my XML layout looks like this:
CODE:...................
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Aug 27, 2010
I'm having trouble with a spiner throwing a nullPointerExpression I'm sure I'm missing something stupid? Code...
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