Null Android
Eugene Hill
When I was debugging an Android application which works with Bluetooth, the flow stopped on an catch block of IOException in which I later found out that exception e was null.... It was thrown when I was trying to read from an InputStream.
This is not possible using a conformant Java compiler and conformant Java virtual machine, and by extension a conformant Dalvik virtual machine. The JLS doesn't allow the e variable to be null at that location
One other possibility you should consider is that the line numbers that the JRE is reporting at runtime (and that the debugger is relying on) are not lining up with the line numbers in the source code. This could happen if you've made a mistake in your build and deployment processes. The mistake might be something like forgetting to save a file, forgetting to build, forgetting to deploy the new version of the app or getting your IDE out of sync with the filesystem.
Go into Settings, General, Usage, Manage Storage. Once there, find the "null" app and at the far right, touch the Right Arrow ">" to take you to the specific App detail screen. There I was able to see some of the details of the app to let me know which one it was (see picture below). In my case, the Blue Infinity logo helped me find it in the iTunes store...under Purchased Apps. Delete the App from this detail screen right now. Then go find it in your list of Purchased Apps and re-install it. Once re-installed I was able to do a backup to my computer...then I was able to delete it completely! Good Luck! Hope this works for you too.
Man, this was the fix I could not find anywhere else. I kept getting the useless "Could not backup iPhone due to error" and was going nuts until I found this. Turns out I had TWO "null" state apps, and after deleting them from the Manage Storage screen, I was able to backup successfully without even having to reinstall those apps.
Sometimes you may delete the null app from the Manage Storage screen, but the moment you exit and re-enter that screen, it's back again. In my case, I had to identify the app from its version number, as there was no other clue. I used xcode to read the device logs and found a "Removed" entry with that version number, which told me which app it was. I then tried to install it from a fresh download. This failed; the phone went into some kind of locked state and I performed a hard reset. Maybe the hard reset after deleting the null app would have succeeded on its own! Anyway, the logjam was cleared and I am once again able to back up my iPhone.
im having this same problem. I don't have codex. the version number and size of my null app is not in my list of apps on my device or not on my device and a google search didn't help. is there any help you can give me to find it please ?
Open the AppStore, then follow the link to Purchased apps. scroll down the list observing the icons on the right. Normally the icon will be the box with Open (or Update) or the download from cloud symbol. The "null" apps have the bullseye download symbol for an unstarted download (mine looked washed out). Tap on that. For me, nothing happened for bit then I got a more normal download icon. I tapped on that, download did its thing and voila, all happy.
I Am using a iPod Touch 5, 32 gb, Blue, iOS 9.2. I try deleting them on the scree, but tried deleting them shut my iPod down, then turning it back on and still there. Do i need to do a factory reset, delete every app, take the iOS 9.2.1? I am so confused and annoye. I may have picked up a virus at ny school's wireless internet shared with 3 grades, and parents.
Ok, so I just dealt with this whole same ordeal, I could not find a non-installed app that matched the version number listed. However the method of removal was correct, you simply have to find the app you are missing, even if it's the long hard way.
In my case, the size of the app and the version number were both different as to what was displayed in the Manage Storage area of Settings compared to the App Store right now. I was looking for an app with a version of 3.0.12 and a size of 59mb (google was useless), when I found the app was actually in the App Store as 3.0.1, and a size of 96mb listed. The only way I figured this out was looking thru my list of "Not on this iPhone" apps, and for version numbers that were at least in the ballpark of the one I was missing. The app versions posted are going to be the most updated version, not the one you might have installed and "ghosted".
I also discovered you cannot look at every app's version history as well. Any app that has been removed from your country's iTunes store, you CAN re-download it (for the most part), but you CAN'T see any other information because it's been removed. So I ended up just re-downloading a handful of apps in the 3.0 to 4.0 range, this took awhile yes, but it worked out.
So, I didn't DARE delete it right away, I wanted the iPhone to recognize it first. I rebooted (simple off and on), and the Settings page was corrected, the app was in it's proper place with name and icon. At this point, I deleted all the other apps the normal way (jiggles). However the offending app I deleted by using the Manage Storage section of General Settings. This time I could see the name of the app and the icon as well. It deleted just fine, then I rebooted for good measure, and all seems well in the world.
So hunting for the missing app was irritating, but it did work in the long run. This was the only time I've had an issue with an app I simply deleted, all other "ghosting" issues I have had with iOS 9 have been updates that don't finish properly.
I really feel this should be (and should have been) a high-priority fix from Apple's point of view. I've found people that use Auto-Update and they have no idea when apps just disappear from their phone because they weren't paying close enough attention.
I have a iPhone 6 with ios 8.4.1, since being contaminated with this "null" app, was neither able to back-up nor to upgrade to ios 9. Also the app version is just too simple 7.5, so google won't work in discovering its name.
Thank you so much. This worked perfectly. I would go to usage storage and delete it but it would always come back. My app version was 2.5.1 So I went into App Store/ app purchase/ not on this iPhone/ and basically installed every app that was version 2.5.1 I had about 5 different apps. The weird thing is the one that was messing up my backup was the newest of all the apps and it wouldn't install right away. It took a few times to try and download it. When it finally did download it was greyed out. I just held the app until toggle mode came on and deleted it. And it worked!!! Right away I was able to back up my phone. Thanks !!!
I've been developing an Android Application for Android (SDK min version 14) and I have testing it normally with tablets such as Samsung Galaxy 2 and Nexus 7.However when I tried to run the application (by clicking run in AndroidStudio), AS does not recognise the tablet information, which is shown in the picture below.
The interesting thing is that as shown in the picture above, AS is also detecting the device sdk as API 1 when it's Android version is 4.2.2The tablet is already set to accept "USB debugging" in the developer options, I'have tried rebooting the tablet, and restarting AS, but still I get the same problem(everything is fine with nexus 7 and Samsung Galaxy 2).
For ubuntu machine select the transfer option and device will detected in android studio as well as for debugging. Generally device is at charging state for windows but for ubuntu this is how it works.
check processes running, i had several adb processes running and i think this was screwing things up for me. Kill them all then restart Studio. HTC Sync Manager, GenyMotion etc and possibly when you have multiple Android Studio windows open can result in multiple conflicting adb processes.
On Ubuntu especially or any other platform. Please and Please Check your adb version. I can't stress this enough. ensure it is updated or the lastest version especially if the above answers doesn't work and this link also does not work.
Under what conditions does ContentResolver.query() return null instead of a cursor object? I've gotten empty cursors before but just realized that the method can also return null. I haven't been able to trace the circumstances that this happens in, though.
I just stumbled over the same problem due to a user crash report I received today for an app of mine. If the Android documentation is unclear about something it helps looking at the source code. This is what I found about the causes for ContentResolver.query() returning null:
The content provider cannot be acquired. This can be due to a problem with the specified Uri or because it simply does not exist on the system. If the Uri is the problem the causes are: protocol is not content:// or the Uri does not have an authority string portion (Uri.getAuthority() == null).
Especially because of (2.) it's pretty much arbitrary what might be the cause for null as a result since there are no rules defined. But usually, if SQLite is the back-end of a ContentProvider you can expect at least some empty Cursor object as a result instead of just null.
Android system ContentProviders do some checks though before they return anything. If the input is not as expected there's the unlikely chance that null may be returned. But to be honest, that never happened to me before. I usually get an IllegalArgumentException in case of query parameter problems. Maybe some ContentProvider implementations return null in case of empty result sets.
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