Android :: Hello World - Java.lang.NullPointerException Error
Jun 28, 2010
it has taken more than i expected to get the dev environment up and running - mostly a PATH issue which was solved using: http://groups.google.com/group/android-developers/browse_thread/threa...
My emulator now works (and i can run it and get the default android screen) however when i try to run the hello world sample code i get this error message:
An internal error occurred during: "Launching HelloAndroid". java.lang.NullPointerException
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Jul 18, 2010
Im trying to display this listview, but I keep getting a: 07-17 21:14:22.233: ERROR/AndroidRuntime(349): java.lang.NullPointerException
I think I know what the problem is but I dont know how to fix it.
I have a String array which I will be using to be displayed in my list
CODE:.....
Dont worry the parser works great. the only problem I see with it is that the parser doesnt know how many strings the website will have so I am setting the String array in the parser to be very big: String substr[] = new String[250];
But I know that mostly there are only like 11 to 13 values that I will be storing in that array, the problem I think is when i do this:
CODE:..............
Since the String array is set to have up to 250 values in it and I only actually store say 12 then there are a null entries so when I run the code it shows me my list view, but when I get to the bottom of the view it force closes and the log tells me that there was nullpointer. I can tell how many entries I collected while I am parsing, but how do I tell my listview to only show say 12 items in the list so there wont be any null entries. or is there any other solution for my problem.
I tried doing what you said, but now I am getting a:
CODE:......
This is what I did:
CODE:.................
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Sep 9, 2010
i am getting this error java.lang.NullPointerException at android.content.ContextWrapper.getPackageManager when am trying to get list of all installed applications on the device. Well let me explain what my program is doing. I have a server that starts when my application is started, and the client pings the server and asks to get a list of installed applications. The Server then asks the getPackageManager() and gets all the installed applications. But the getPackageManager returns the nullpointerexception. The Server is written in a java environment and is started from my android application. Could someone please tell me what am missing and why i am getting this error? hanks alot!!!Please find the code...
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Jun 23, 2010
I am trying to save the date of file parsing, so that when next time user, opens the application, the date can be checked against the last parsing date. I am using shared preference to save the data and retrieve it, but getting error. here is the code:
SharedPreferences settings = getPreferences(0);
String today = new Date(System.currentTimeMillis()).toString();
SharedPreferences.Editor edit = settings.edit();
System.out.println("******** Today : " + today);
edit.putString("lastdate", today);
String fetch = settings.getString("lastdate", "0");
System.out.println("******** Fetch : " + fetch);
txtTest.setText(fetch);
but I am getting null pointer error. am I missing something?
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Jun 30, 2010
I have looked and looked, and cant seem to get to the bottom of this.
I am getting the error: "java.lang.NullPointerException"
whenever I try to change anything at all within "strings.xml" when using eclipse, does anyone know of a reason behind this? I havnt changed anything else in the project at all, I'm just going straight into strings to try editting a few things.
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Oct 20, 2010
I'm getting this crazy error on multiple projects, even when I revert back to prior versions that compiled just fine. Unknown Error - java.lang.NullPointerException Android Packaging Problem Path is blank Location is Unknown. 1 - Project -> Clean -> All 2 - Deleting .metadata folder 3 - reimporting projects into the eclipse 4 - reverting my projects back to prior working versions using git. I just can't get anything to compile now, and I've searched for solutions here and on eclipse forums.
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Jul 22, 2009
I have one Activity, that starts one Service and my service will lunch one Activity, i wanna to stop the Activity which one started my my Service after few seconds. Is there any way to achieve. Has anyone experienced this type of scenario.
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Oct 6, 2010
I have a Service Receiver and a phone state listener class to determine the status of the phone. When the state is "CALL_STATE_RINGING", I call upon the method stopAllPlayback() in my main Activity. It is at this point that users report "Forced Close" messages. Can you help me determine where the problem might be? I'm new to Java so I'm not 100% sure how to troubleshoot based on a stack trace.
Here's the stack trace:...............
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May 4, 2010
When you get an error like the one below (Android 1.5), is it because there are too many nested ViewGroups, or because the total number of Views is too great? Are there any tricks to get around it while still keeping the same look to your app?
CODE:....................
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Jun 24, 2010
I have a service running that updates a notification in the notification bar when it recieves a message saying it has to be changed.
However I get the following error sometimes when the notification is to be updated
java.lang.IllegalArgumentException: contentIntent required
Here is my code:
Variable setup
code:............
NotificationManager Creation
code:..............
Notification Creation
code:.............
Update of Notification
code:...............
So something is happening my contentIntent somewhere along the line, would that be correct?
It is declared at the top of my Service class as a member variable and is not used anywhere else in the code apart from shown above, so where could it be getting reset to null?
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Aug 19, 2010
In my application am displaying a list of names and respective pictures ? I am picking picture from gallery through Durable.getFromPath(). ? am displaying list , some i encountered with out of memory error ? please help me to sort out this error?
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Oct 27, 2009
I am using the Eclipse plugin and I have the above error. I know why it is occurring, it is because I want to override a class file in one of my imported jar files. I am including a new Util class before the jar file in question. I have tried it both as a simple .class file in my package hierarchy and I have tried putting it into another jar file and including it before the one to be overridden.
I would like it to behave like the Java classpath and use the first one it comes to when running through all the classes. I don't mind if dex wants to give me a warning that it is not using the second Util.class file but it should let me build my application. To build my app, I have to create a special jar file without the old Util.class in it. This is annoying as I would like to use the bog standard version so that others can use it with ease too.
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Aug 8, 2009
Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?
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Feb 11, 2009
I'm having some problems porting a Java application to work in Android platform. I detected an incompatibility problem between java sun and Adroid sdk in java.lang.Class. I oberved that: public Field[] getFields() Returns an array containing Field objects describing all fields which are defined. That's array is sorted as attributes are declared in the main Class in sun jdk. For example, next Class is defined as: public class Example { public boolean stop; public int atr1; public String name; ....
}
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Oct 19, 2010
I have an app that runs perfect on 2.2 and 2.2 but always getting VerifyError on 1.6 while startup, I don't think that my app cannot run under 1.6 because I don't call any APIs that don't support 1.6. I'm really confused, does anybody has the same issue?
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Jun 16, 2010
I have the following code which gets call in my main activity's onCreate method
public static ErrorReporter getInstance(){
if (instance == null){
instance = new ErrorReporter();
}
return instance;
}
Only on android 1.5 calling the above method causes java.lang.VerifyError. I am not able to figure out why this is happening.
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Nov 15, 2010
I'm trying to add ScoreNinja, the global high score system, to my Android game, and it works fine when I load it on my phone, but when I release it into the wild, I got crash reports saying: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
Here is part of the call stack:
android.os.Handler.<init>(Handler.java:121)
android.app.Dialog.<init>(Dialog.java:99)
android.app.AlertDialog.<init>(AlertDialog.java:65)
android.app.AlertDialog.<init>(AlertDialog.java:61)....
I thought the main thread had prepare() called automatically, and if not, why would it work fine for me but not anyone else?
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Apr 21, 2009
I've got a strange problem here doing object de/serialization. In Java (JDK 1.6) I serialize some objects. In Android (SDK 1.1) I deserialize them. This work quite nice in general. In order to work with a server object (that uses Castor un/ marshalling) I do it like I always do. Same routines. Well, this time the file is only 172kb (my routines works pretty well with 2,4mb files) but the interlacing is quite deep. So it all starts with a class containing 2 ArrayLists. I tried de/serializing just ArrayList<String> and this works very well. But the XML file (which is unmarshalled with Castor and serialized in JDK) has 7000 lines. So I get this StackOverflowError....................
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Jan 6, 2010
I'm getting this error: "Uncaught handler: thread main exiting due to uncaught exception java.lang.VerifyError" It's only happening on 1.6. Android 2.0 and up doesn't have any problems, but that's the main point of all. Can't catch the Error/Exception (VerifyError), and I know it's being caused by calling isInitialStickyBroadcast() which is not available in SDK 4, that's why it's wrapped in the SDK check. I just need this BroadcastReceiver to work on 2.0+ and not break in 1.6, it's an app in the market, the UNDOCK feature is needed for users on 2.0+ but obviously not in 1.6 but there is a fairly amount of users still on 1.6.
private BroadcastReceiver mUndockedReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
//FROM ECLAIR FORWARD, BEFORE DONUT THIS INTENT WAS NOT IMPLEMENTED
if (Build.VERSION.SDK_INT >= 5)
{
if (!isInitialStickyBroadcast()) {
int dockState = intent.getExtras().getInt("android.intent.extra.DOCK_STATE", 1);
if (dockState == 0)
{
finish();
}
}
}
}
};
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Jul 3, 2010
I'm facing a recurrent problem that I don't know why it is happening. It happens all of a sudden. I didn't do anything different from what I was doing before. I'm using these tabs: http://developer.android.com/resources/tutorials/views/hello-tabwidget.html. When I open one of the three tabs (Class name = Tab1), this problem comes out. Before, this error came out after clicking all of the tabs.
A part of the stack trace: Could not find class 'org.android.catsMobile.packageName.Tab1$OrderAdapter', refereced from method org.android.catsMobile.packageName.Tab1.onCreate [...] threadid=3: thread exiting with uncaught exception (group=0x4000fe70) java.lang.VerifyError: org.android.catsMobile.packageName.Tab1.
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Sep 7, 2010
I have one android project. I have one class file of about 6000 lines when i tried to add more code it shows the java.lang.verifyerror.
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Sep 23, 2010
I have created and published my first android app. It's very simple. It works fine on simulator and some phones, but I am getting this error:
CODE:.......................
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Jun 16, 2009
I am getting java.lang.ExceptionInInitializerError while reading yml file.The code that i am using for reading yml file is InputStream inputdatfile=Myclass.this.getResources().openRawResource (R.raw.datafile); Map<String, List<Map>> data = (Map<String, List<Map>>)Yaml.load (inputdatfile); I am getting the error in the second line.My yml file is in res aw folder. the external jar file i am using here to read yml file is jyaml1.3.jar. i tried to add <uses-library android:name="org.ho.yml" / > in manifest file that time i am not able to install the app in
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Jan 28, 2010
i have several gpx files on my sd card and i show them (the filename) on a listview. if i choose a gpx file, the track is load in another activity with a listview,too (adress-strings are shown). if i use the back button, the listview with the filenames is shown again and i can choose another file. but if i repeat this the third time, i get this error:.................
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Mar 4, 2010
i have two diff applications in two diff packages. i am trying to use the functions of one package from another which crashes my application. this shows me with java.lang.VerifyError in the adb logcat. there is no problem while compiling my app. but its not able to run.
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Jun 8, 2010
I used this sort of code to make sure my bitmaps load:................
In 2.2, it's now failing sometimes and my catch block no longer catches anything. Why would that be? Is there a better way to avoid a java.lang.OutOfMemoryError?
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Sep 17, 2009
I am using custom listadapter for ListActivity, but half adapter is getting built and then throws "java.lang.StackOverflowError". When I ran the same code on sdk1_1r1 it works perfect. When do i try to run on sdk1_5r3, gives this error. Generally java.lang.StackOverflowError when happens if the some function caught in infinite recursion, but if this is case then why does it working on sdk1.1r1 perfectly. I tested the appl on sdk1_5r3 both emulators default AVD(96 RAM) and custom AVD(523 RAM). For all try it gives the same error.
Log Cat:..........................
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Feb 15, 2010
I get about 50 of these coming from my users each day.I realise that this is a Motorola Droid bug - http://code. google.com /p/android/issues/detail?id=5164 Is there anyway I can catch this error in my code?
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Jul 3, 2009
Why do I get java.lang.ClassCastException when I tried to cast back an array of custom object that implements Parcelable?
Here is the custom class:
CODE:..........................
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Jul 23, 2010
I'm making a http get request like this:
CODE:.........................
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