Android :: Location Object Passed Into OnLocationChanged Is Null?
Aug 8, 2010
I have an activity that implements LocationListener in my application and my onLocationChanged method has been working perfectly up until recently. For some reason the Location object being passed into the method is null. My question is, why is it null? Does it pass in a null object if it cannot acquire a location?
My GPS is on and I have it set to pull a location from the GPS, and I know my GPS can get a fix on me as I used Maps and had it locate me.
Also, I have the permission for my app set as:
CODE:.................
I don't believe permissions is the issue though, as my activity was working beforehand and I have not altered the permissions since then.
Here is the code that determines the provider of the location object:
CODE:.............
Here is the LogCat output of the error:
CODE:..............
I have tested the same code on another device (an HTC MyTouch 3G to be precise) and it works flawlessly with the GPS, however on my Motorola Droid it crashes.
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Dec 14, 2009
This subject originates here: http://groups.google.com/group/android-beginners/browse_thread/thread...
To sum up:
When I click on an item in the ListView, the background color that gets changed is not that of the clicked item but instead of the other item in the opposite side relative to the middle item:
1 <-- I click here 2 3 <-- Acts as a mirror 4 5 <-- This is the one that gets changed
1 2 <-- This is the one that gets changed 3 <-- Acts as a mirror 4 <-- I click here 5
This problem persists even when I use CheckedTextView like what is suggested in the post.
I use the latest stable SDK.
This problem occurs when the target platform is Android 1.6, 2.0 or 2.0.1.
The problem does not occur when the target platform is Android 1.1 or 1.5.
However, the problem will also occur when the program is compiled for 1.5 and run in 2.0.1.
The simple problematic code can be found here: [url]
There I also put the screenshots showing the problem: demo01.png: I click an item. demo02.png: the clicked item doesn't get changed but the reflective item does.
Is this a bug in newer Android platforms?
If it is intended, what is the reason and could you please show me how I should fix my code?
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Sep 1, 2010
While doing normal day-to-day Android development, is it safe to assume that hook methods called by the system will not pass in invalid references (ex.: null), or should I always be double-checking what arguments get passed in?For example, can the method onOptionsItemSelected(MenuItem) ever have a null MenuItem reference passed into it?The reason I ask is because I was working on the Notepad 1 tutorial,I started wondering if I should be testing if item is null before making a getItemId() method call on it, or just trust the system to not ever pass me a null?I don't want to make my code slower by doing null checks when I shouldn't be worried about that happening, etc.
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Oct 29, 2012
I've gone through the Notepad Tutorials and they are all working on my virtual device. I am now stuck in the midst of trying to write my own Android app.
My setup:
Windows 7 SP 1 64-bit
Eclipse Indigo Service Release 2
Android Development Tools 16.0.1.v201112150204-238534
Android Virtual Device Platform 2.3.3, API Level 10, CPU/ABI ARM (armeabi)
The app is about as simple as they come - you enter a number, it divides it by another number and displays the result.Here is the code involved:
AndroidManifest.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.driving"
android:versionCode="1"
android:versionName="1.0" >
[code]...
By the time DrivingTimeEstimator's onCreate() method gets executed, the Bundle object (savedInstanceState) is null (which I'm guessing is what leads to mMiles being null, which throws a NullPointerException and kills everything).
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Jan 9, 2010
I am creating an application which retrieves images from the web. In case the image cannot be retrieved another local image should be used.
While trying to execute the following lines:
CODE:................
The line if(drawable.equals(null)) throws an exception if drawable is null.
Does anyone know how should the value of drawable be checked in order not to throw an exception in case it is null and retrieve the local image (execute drawable = getRandomDrawable())?
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Jun 22, 2009
I have a webview with a FriendConnect button to allow a user to login to FriendConnect.
When clicking on this button, I'm taken through the expected screens for logging in.
However, it seems like the last redirect after logging in fails with a Javascript error in the browser:
CODE:...............................
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Sep 3, 2010
I have a very simple Android activity layout like this:
CODE:..
Now when I (from onOptionsItemSelected) do the following:
CODE:...............
The contents of imgView is allways null!
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Aug 16, 2010
I am following the Parcelable example in the Android developer guide with the intention of having a more complex object that I send to different activities. Right now, my class is a wrapper of a String member. If I put the object in the intent and read it back from the Intent it reads as expected, however, on the receiver side, it is always null-pointer.
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Jan 30, 2009
I am trying to run a simple program which shows lat and long values but Location value is always null.
CODE:...
Emulator shows alert force close - wait
How can i debug line by line, at the moment i am usinng if, else to see veriable value.
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Oct 17, 2009
I can't display my map on android emulator. i have, locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); location = locationManager.getLastKnownLocation("gps"); After those lines,the Log shows null for location instead of the object location
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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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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 23, 2010
I'm trying to get the street name of my current location but I can't seem to get it.
I use this method to retrieve the Address. code...
And then I can do things like. address.getLocality() and address.getPostalCode()
But what I want is the street name. Like in "Potterstreet 12". When I print the AddressLine(0) and AddressLine(1) I only get the postalcode, city and country.
How can I retrieve the street name of the position I'm currently at?
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Mar 2, 2010
Is there a way to find out the final location of my animated "object" after the animation? Let's say I am animating an ImageView with location in parent as (0,0 - 20,20) using TranslateAnimation and ScaleAnimation over 1 second with setFillAfter(true).
How to I find the final location of this "object" (since the View location itself does not move)? I need to continue the animation from this point based on an user input.
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Jun 6, 2010
I'm looking to test some code I've written and to do so I need to construct a variable of type Location and to give it a long / lat value but I'm unsure how I would do so.
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Feb 25, 2009
In my application I want onLocationChanged() to be called frequently. Is it possible? Actually, I should get the accurate accuracy of the location. How to do it?
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Apr 30, 2010
I write a class which implements LocationListener. Its just listening to the location. I tried the code in Tatoo, but its not working. The code is...
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Mar 7, 2009
I have been struggling to get onLocationChanged called, but I'm not sure it does not. Here're my code
criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setPowerRequirement(Criteria.POWER_LOW); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setSpeedRequired(false); criteria.setCostAllowed(true);
String locationContext = Context.LOCATION_SERVICE; locationManager = (LocationManager)context.getSystemService (locationContext);
String provider = locationManager.getBestProvider(criteria, true);.................
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Jul 2, 2010
I've a problem, I call a method that draw a circle over a canvas inside onLocationChanged but it doesn't do anything. Can anyone tell me why ?
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Jul 5, 2009
I'm developing an application wich has a location push service that start at boot. The main responsability of this service is very simple, just inform the location of the phone based on the *requestLocationUpdates* parameters. I don't care if it's using the network or GPS, obviuosly I'd prefer the most accurate one, but if the GPS is turned off, I don't mind to receive the network less accurate location fix. My problem is that the service isn't working as I expect, since I deploy the app on my HTC Magic, and after a lot of miles driving my car, only the first fix is shown, but no one else. Here some snippet of my service (BTW, I've checked with DDMS that the service is launched at boot):
CODE:..................
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Sep 9, 2009
I want to do some automated testcase with Instrumentation . Suggest that my AUT has 2 Activity. After clicking the button in ther first Activity, the second one will be shown with new content base on what we enter in the first Activity.) Instrumentation provides us the function called startActivitySync() and return the Activity object for processing. My question is how we can get the pointer of the second Activity after the it is shown by clicking the button on the first activity.?
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Jun 8, 2009
I would like to convert a Picture object to Bitmap object in memory, without writing data to disk.
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Sep 21, 2009
I have an Activity that running on system. I can get the Intent that is used to start the activity. But i don't know how to get the Activity object from the Intent object or something else. Can anyone tell me how to do this??? Note that, I don't use Instrumentation object.
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May 11, 2010
I'm trying to pass a bundle of two values from a started class to my landnav app, but according to the debug nothing is getting passed, does anyone have any ideas why?
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Aug 18, 2009
I was wondering if there is a way to determine who passed an intent to my application. For example, I have a service, that I want to act differently depending on who passed the intent (for security reasons). I'm trying to sandbox each calling application, so they only have access to their data stored in my application.
For it to be secure, I cannot trust any application to be truthful about the identifying data it is passing into my service. Therefore, I need some system way of identifying who sent the intent in a way that the calling application cannot change that information. I don't know if it is possible, but I can't find anything in the Intent class, and I was wondering if there may be another structure which does what I want it to. If it is not possible, I would like to get some type of mechanism to do this in the roadmap.
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Jun 28, 2010
I want to receive a data which is passed using intent from another page.
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Aug 5, 2010
As asked, is it possible? Here's part of my code. I don't know how to change it.
CODE:............
And yes, the error toast came up!
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Jun 28, 2010
When we want to pass data from an activity to a sub activity we use the is there any event handler that handles this?
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Jul 27, 2010
I am writing a music player for esoteric music formats, and have defined mime types for them in my Manifest.
However, the standard music player is always started even though it can't handle the format. Looking at logcat I see;
: D/MediaScannerService( 688): IMediaScannerService.scanFile: / sdcard/download/Cybernoid.sid mimeType: audio/prs.sid : I/ActivityManager( 578): Stopping service: com.android.providers.media/.MediaScannerService : I/ActivityManager( 578): Starting activity: Intent { action=android.intent.action.VIEW data=file:///sdcard/download/ Cybernoid.sid type=audio/prs.sid flags=0x4000000 comp={com.android.music/com.android.music.MediaPlaybackActivity} }
.. so it seems the component is explicitly set to the music player ? Is there any way around this ?
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Aug 4, 2010
Why below code is throwing nullPointer exception in last line (when accessing javaInterface.mValue) This line through NullPointer, so basically it is not being set. even though the javascript is correct and has been verified using FireBug that it returns expected string.
There are few lines above this code chunk but it is irrelevant this problem
CODE:................
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