Develop Reference

Xamarin.Forms System.ArgumentException: Illegal characters in path

I am brand new to Xamarin.Forms projects. I have created a project with VS2019 which has not been modified in any way, added a Pixel 2 Pie 9.0 - Api 28 emulator within the Android Device Manager. When I try to run the project on the android emulator, I am unable to run my app, with the following exception in my error list:
Error XARDF7004: System.ArgumentException: Illegal characters in path.
at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String fullPath)
at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at Xamarin.Android.Tasks.RemoveDirFixed.RunTask()
at Xamarin.Android.Tasks.AndroidTask.Execute()
Since I am simply using a basic project template generated by VS2019, this has to be a bug on Microsofts end. How can I fix their error?

It had to do with the character length of my solutions folder.
C:\Users\david\Dropbox\Projects\Visual Studio\PriceWatch\PriceWatch\PriceWatchXamarinForms\PriceWatchXamarinForms
(This bloated structure was generated by the IDE, everything after the Visual Studio folder)
I changed it to C:\Projects\PriceWatch\PriceWatchXamarinForms and then it worked.

I our case the reason was that some of our third party dependencies (api assemblies) forced us to set Properties > Android Options > Linking to "Sdk and User Assemblies" instead of "None".
Hope this helps someone...
Bad error message.

I recently experienced this with VS 16.9.2 AND 16.9.3. And this is how I fixed it.
Open android SDK manager (make sure you have at least API level 29 or 30 checked).
Click on the Tools tab right next to Platforms Tab(that you will have landed on)
Ensure that the following are installed:
-> ANDROID SDK command-line tools, Platform-tools, build tools, Android emulator and NDK
P.S. It might take a while to download and install.
Don't forget to create your emulator of choice once the above steps have been successfully completed.

Was able to fix this problem by starting an adb shell and go into the app directory:
/storage/emulated/0/Android/data/com.fips.SorterApp/files
then
rm -rf .__override__
and deploy worked again

There are many causes for this error.
Mine was caused by having invalid directories in my system PATH. Removing the invalid entries and restarting my environment (either by killing and restarting all explorer.exe processes or by restarting machine) solved the problem.

A solution to this is the subst command it creates a "new" drive at a folder location. Then you open the sln file from the new drive.
subst e: C:\Users\david\Dropbox\Projects\Visual Studio\PriceWatch\
then open the e: drive in file explorer or the open solution dialog

I spent hours on this error and none of the suggestions regarding changing the path worked for me. What did work is I went into the android simulator and went into app settings and forced stop, as well as clearing storage and cache.

Unable to setup Android Studio 3.0.1

I installed Android Studio 3.0.1 and everything seemed to go as expected. When first starting up, I got to the point of downloading the SDK components, and received the following error.
"Android Support Repository, Android SDK Tools and 7 more SDK components were not installed"
Has anybody every seen this? Any ideas or suggestions are greatly appreciated.
I am using Windows 10 64 bit. I was able to capture some more details of the failure.
"java.nio.file.AccessDeniedException: C:\Users\gcleveland\Documents\Android\SDK2\extras\android\m2‌​repository.backup.i‌​nstaller.installDat‌​a -> C:\Users\gcleveland\Documents\Android\SDK2\extras\android\m2‌​repository.installe‌​r.installData Warning: Failed to move original content of C:\Users\gcleveland\Documents\Android\SDK2\extras\android\m2‌​repository back into place! It should be available at C:\Users\gcleveland\Documents\Android\SDK2\extras\android\m2‌​repository.backup"
There are multiple other instances like this but different directories.
It is almost as if my permissions are not correct. I have full administrative rights and run android studio as an administrator.

I ran into similar issues with the exe file version and resolved them by instead downloading and installing the zip version of Android Studio 3.0.1 for Windows 10 (https://dl.google.com/dl/android/studio/ide-zips/3.0.1.0/android-studio-ide-171.4443003-windows.zip). After unzipping this file, I simply executed its bin/studio64.exe. I also switched my networking connection to NOT need a proxy, which may also have helped to resolve the issue.

What can I do to fix a Android SDK Null Pointer Exception error?

I am having a problem creating my first Android App.
I installed JDK 7u21.
I downloaded and extracted Android SDK Build: v22.0.0-675183.
I started Eclipse and created a new Android Application Project.
When I click Finish I get the following error:
Errors occurred during the build.
Errors running builder 'Android Resource Manager' on project 'Steve'.
java.lang.NullPointerException
I have search and couldn't find anyone with the same problem.
Did I install something wrong? Is something missing from the SDK? What can I do to correct this error?

In my case I switch from Android SDK 64 bits, to Android SDK 32 bits. Now it's working perfectly.

Have the same problem after updating SDK to 22. For me, it seems to be a backward compatibility fail by Android vs. Eclipse (on my side additional with Maven).
See also: Eclipse Upgrade Not Working
So not your fault. Try f.e. IntelliJ for the moment. There is also a specialised version, called Android Studio but this is not that stable as the original.
The Android guys also deliver a complete package for Eclipse + ADT-Plugin, but not sure, whether this solves the problem.

I've run into the same problem. Every new project, imported or otherwise throws that exception.
It appears to be a bug with Eclipse, and the simplest fix for me was to re-extract the ADT bundle, and replace only the eclipse directory. It'll take forever to download the SDKs if you replace the SDK directory too.

ADT bundle does not work with the Oracle Java 7 SE JDK, failing with an NPE in the Android Application Project wizard.
Installing the Eclipse Plugin
Here's a workaround that lets you keep Java 7 as the default but run ADT with Java 6 when you have both installed. Bring up $ADT_DIR/eclipse/Eclipse.app/Contents/MacOS/eclipse.ini in an editor. Before the -vmargs line, insert these two lines:
-vm
/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java
or any place your java is installed, for example on my computer:
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java
Android issue tracker - answer

This works for me:
For those who experience the same problem, here is how i fixed it: After a couple of try and errors, I found out the problem was about creating an activity in the create project wizard. If you simply deselect the create activity button at the 2nd step of the wizard, it creates the project succesfully. Then you can add an activity to your project easily.
Source:
https://code.google.com/p/android/issues/detail?id=68755

Titanium Studio cannot find Android SDK (tried multiple solutions)

Okay. I'm kind of at my wits' end here. I've been trying for about 2 days to set up Titanium Studio to recognize and connect to the Android SDK (Windows 7). I have tried multiple solutions (below) with no luck. There's got to be something I'm missing. I've tried Google and the Titanium developer guides. So this is my last straw. Any ideas?
Android SDK home path is C:\Android\android-sdk (to avoid spaces with "Program Files")
installed all SDKs (3,4,7,8,10,11,12,13,14,15), their Samples, and all Google APIs
installed all "Extras" packages
Added both the Android tools and platform-tools directories to Windows' PATH variable
Copied adb.exe from platform-tools to tools as Titanium likes to look there for adb
Installed the current master build of Titanium SDK for Mobile Devices
Created Android Virtual Devices (AVDs) for SDKs 7 and 8 (Titanium's required SDKs)
Restarted adb server and computer itself after each change
On the Titanium 'Dashboard' tab, under 'Configure', I get:
An Android SDK is missing. Titanium requires Android platforms 2.1.* and 2.2.*
When attempting to set the default Android SDK path in 'Preferences', I get:
Could not locate the Android SDK at the given path
Titanium log file output (sorry, kinda long):
!ENTRY com.appcelerator.titanium.mobile 4 0 2012-02-22 14:06:21.992
!MESSAGE (Build 1.0.0.1327639206) [ERROR] [ERROR] The system cannot find the path specified.
[ERROR] The system cannot find the path specified.
Traceback (most recent call last):
File "C:\Users\Stick\AppData\Roaming\Titanium\mobilesdk\win32\2.0.0.v20120221190136\android\avd.py", line 45, in <module>
print get_avds(sdk)
File "C:\Users\Stick\AppData\Roaming\Titanium\mobilesdk\win32\2.0.0.v20120221190136\android\avd.py", line 21, in get_avds
for line in run.run([sdk.get_android(),'list','target'],debug=False).split("\n"):
AttributeError: 'NoneType' object has no attribute 'split'
I have no idea what's missing. Eclipse recognizes everything just fine. ANY suggestions??
P.S.
I've noticed that when I attempt to run 'android' commands, i.e.
android
android list targets
I get what seems to be an error:
The system cannot find the path specified.
However, the commands still continue to run with no issues (I get a list of all the targets and the SDK Manager pops up). I'm not sure whether or not whatever is causing that message is also causing Titanium headaches.

I was facing the exact same issue, but now I have figured this out and it was working fine.
Basically, when I install Titanium Studio and I configure Android SDK it worked fine, but when I try to execute Project there was "javac not found" error. While resolving this issue I came across a Post where it was mentioned to include '%JAVA_HOME;%' in your Path. And when I did this the Android SDK was not longer detected by Titanium.
I removed the '%JAVA_HOME%' from Path Variable and then I include Java bin Folder Path to Path Variable and created a new variable 'JAVA_HOME' which points to root directory of Java installation. Everything works fine after doing this step.
I hope you will now get your Titanium Environment running. :-)
Thanks.

Newer version of Titanium have the Update Android SDK option in the Dashboard. Just make sure, the path is correct. Some cases like mine, there might be two Android SDK paths; one was obsolete and the other was active. So, please make sure of that path. When Titatnium is about to update the SDK software, looking in for newer versions, please select Cancel, as that wouldn't be required!

open titanium ide.
click on file-> titanium mobile project.
a window will show up with a link Set-up/Configure SDKs in the
bottom. click on this link.
now give android sdk home: c:\Androi\android-sdk (or browse to
android-sdk folder in your system)
select the default Android Sdk
click Apply
Click Ok.
You should be good to go.
Let me know if you face any problems.

Eclipse crashes when I invoke Android Layout Editor

I'm new to Android & Eclipse. I've downloaded Eclipse and the Android ADT and created an ultra-simple Hello World app (has only auto-generated .java and .xml files).
Eclipse CRASHES (closes after a very brief pause) when I do the following:
In Package Explorer, select AppName/res/layout/main.xml
Press , or double-click, or 'Open With' then 'Android Layout Editor'
(The app runs OK in the Android emulator)
My configuration is:
Android Development Tools 0.9.5.v200911191123-20404 com.android.ide.eclipse.adt.feature.group
Eclipse IDE for Java Developers 1.2.2.20100216-1730 epp.package.java
Windows XP
Can someone tell me what I'm doing wrong or what's wrong with my configuration?
Any suggestions on what to check? For any non-trivial app development I need to
be able to use the Layout Editor.
More ... I can select main.xml and Right-Click and 'Open With' any of: XML Editor,
XML Schema Editor, Text Editor -- with no problem. The problem is limited to Android Layout Editor.
THANKS!

I found the problem.
I discovered the .log files (under \Android SDK\eclipse-java-galileo ...\eclipse )
These files are apparently created by Eclipse when a fatal exception occurs. Upon examining the latest file I saw
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d2521e1, pid=9156, tid=13952
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_02-b09 mixed mode)
# Problematic frame:
# C [fontmanager.dll+0x121e1]
and when I looked further, found the folder where fontmanager.dll resides.
Deducing that 'fontmanager.dll' was part of the Java runtime, I saw that I'd been using jre1.5.0_02, and, upon checking the Sun site, discovered that it's an outdated file. So I downloaded (from Sun site) and installed the latest version of the Java runtime.
That fixed it! The Android Layout Editor runs without problems.
THANKS to Nathan for his efforts. As it turned out, his suggestion didn't solve this particular problem, but the info he provided will no doubt be useful.

You have to upgrade your jdk version to the latest version. I found most of the cases online is that the jdk5 made the eclipse crashed and they worked out by upgrade to jdk6. I used jdk6 but the problem existed! At last I download the latest version(jdk7) and the eclipse not crashes any more!

DONT do anything in eclipse while it says "building project" at the bottom right it does this when you load eclipse, and when you run, or add new files.
If you still have the problem, then I cant help you

In case the above answers don't help, this was my resolve:
I had a similar problem where every time I would view the layout editor (even though I was able to see the XML file) Eclipse would crash. I reinstalled Java, updated Java, and I even reinstalled Eclipse with no avail. It turns out that it was a corrupt video driver, nvd3dum.dll. The filename is in the error list.