Develop Reference

Problem with launching my app on Android Emulator (both Visual Studio and Android Studio)

I first tried to run the Xamarin.Forms project in Visual Studio (but the same problem is in Android Studio).
I create "Hello World" on Xamarin.Forms and when I run it, it starts the emulator and then there is only Android System on the emulator, but no my program.
Then I tried to start emulator first, it doesn't work at all.
Then I tried in Android Studio. I created a project and I want to run it in Android Studio and the same happen...
I tried on diffrent computer but it didn't work in the same way...
I have recorded all my steps. You can watch it here:
https://youtu.be/izjNIP56wvI

OK. Solved.
I just installed new emulator. Google Pixel 5.
Then from Visual Studio Device Manager I have installed x86_x64.
And when I started emulator from Device Manager it began to work.
I have tried 5 hours to start this emulator and now it is ok.

how to enable emulator in android studio?

I've been learning Android studio and android app development for a while now and I've been installing emulator .I recently installed the Nexus 5S API 24 but that showed some emulator errors
enter image description here
And then I thought the problem is with the API and so downloaded an emulator with lower API i.e; NEXUS 4 API 18 and that is also not running showing the same error. I thought the problem is with android Studio and hence I uninstalled the whole Android
Studio and then downloaded it again.But again the same errors show up.
I tried connecting my phone as an emulator instead of downloading an emulator.
But then, something showed up like in the picture below
enter image description here
Mine is a Gionee P7 phone .
Any help on this issue would be helpful .

Open the SDK Tools (Tools> SDK Manager> SDK Tools) to check if you have installed the Intel X86 Accelerator, if not, check the box and apply, then restart your AS, it should work.
Still recommend you to use real device to run your application, since the emulator really cost a lot of memory resources.

Emulator on Android SDK failed to start on Windows 10 Pro

I am working with Ionic Cordova project and trying to run emulator. I am using trial version of windows 10 pro, till now didn't put license, it is trial only. though Android studio, Java sdk, and Android-SDK installed correctly but when trying to start emulator (for a correctly created virtual image) it is failing to start. It is visible for 1 seconds after that it is never visible. In-fact event viewer also not showing any error log. is it due to trial version of win 10 pro? I have no clue why it is happening?
I have tried by both installing hyper-v and once unstalling hyper-v, but none worked. I am not sure if hyper-v feature should be on or off. What is correct way?

How did you install the emulators and SDK exactly? What Android SDK version is the emulator based on? Are you really using Visual Studio and the Tools for Apache Cordova? What VS version, cordova and cordova-android versions?

If you see emulator icon, but don't see window, just recreate emulator. This is because of bugs with emulator position (when emulator window is off-screen).
Anyway, try recreating virtual device

Where are my Visual Studio Android emulators?

I'm just starting Jesse Liberty's new Pluralsight course, "Building Your First Mobile Application with Xamarin.Forms and Visual Studio 2017" and I'm running into a problem right out of the gate.
In the video, Jesse creates a new Xamarin.Forms project, modifies the XAML a bit, and runs it. Here is a screenshot of his list of emulators:
I've disabled Hyper-V, and installed the latest Intel HAXM.
I've followed along step-by-step, using the latest version of VS2017 (installed yesterday, no updates available), and I've used the Android SDK Manager to install the SDK Platforms APIs 23 - 27. More specifically, I've installed every available option for Android 6 (API 23), which is what shows in Jesse's list.
I have set the following Android project Properties:
Application :: Target Framework = Use Latest Platform (Android 8.0 Oreo)
Android Manifest :: Minimum Version = Android 6.0 (API 23 - Marshmallow)
Android Manifest :: Target Version = Android 8.0 (API 26 - Oreo)
When I open the dropdown, I don't even see the VisualStudio_android emulators at all, and I'd assume they come preinstalled with VS2017 when I install Xamarin, but no:
I have no idea where to get the Visual Studio emulators; but, as I understand it, they run much faster than others so figuring this out will probably be worth my time.
The Android Virtual Device (AVD) Manager doesn't list the VS emulators, so I can't add them from there. I know there is an Android emulator from Microsoft but it says it's Hyper-V compatible, and I've just disabled Hyper-V to use the other emulators. Is this a good choice? Are these the emulators I'm missing?
I'm out of ideas - what's my next step?

They have been renamed to streamline development. We only install a minimal amount of emulators. They used to be named visualstudio_ and now just android_ but you can create as many as you want.
I use intel haxm x86 emulators from google.

It turns out, the emulators weren't installed for some reason when I installed VS2017 and the Mobile Development Workflow.
I went into the "Individual Components" tab in the Visual Studio Installer, checked the emulator boxes, and all the emulators show up fine now.

Try uninstalling visual studio and then installing it again (save your projects first) and make sure that you install the Microsoft Visual Studio Emulator for Android. Check everywhere in the installation guide (Specifically under Cross platform mobile development). You might have missed it during your installation process.

Xamarin.Forms Visual Studio 2017 project does not deploy

I am new to Xamarin. I used Xamarin. Forms template to create a sample mobile solution in Visual Studio 2017. The process created four projects Xamarin PCL, Xamarin Android, Xamarin.iOS and Xamarin.UWP. Without making any modification to the generated solution, I am trying to run it.
The first issue is, when I set the UWP as the starting project, the Windows emulator shows up and runs the app perfectly. But when I try to do the same with Android, I get different errors at different times based on the environment changes I make. Finally, using the visual studio android emulator, the Phone UI shows up but not my app. In the background, I can see that Visual Studio completed the build process successfully without any errors but the deploy process simply hangs. I left the deploy running overnight but still running in the morning. Here is my environment.
Intel Core i7 processor
Virtualization enabled in BIOS
Windows 10 Education
32GB RAM
Hyper-V disabled in Windows
Executed bcdedit /set hypervisorlaunchtype off in the command window and rebooted.
I tried setting the above environment in different combinations but none of them seem to make the app work. When I use an android emulator from android SDK, the build process throws errors. The only emulator that even builds is the visual studio emulator. But the deploy hangs.
A second issue I have is, I have installed android SDK for version 24 and 25. But in the emulator dropdown, I can only see the emulators for 23. I checked the installation path both in visual studio and android SDK manager and they both point to the same installation folder. What do I need to make the emulators for version 24 and 25 usable?
I repeat, I did not make any change to the generated solution in visual studio before running it. I have been at it for the past three days and couldn't make it work. Please help.

I just installed Visual Studio 2017 (on Win10 15063.138) and found, like you, Xamarin projects won't deploy to Android. Here's how I got running:
Updated everything in the Android SDK Manager.
Installed the new, improved Android Emulator from MS:
https://www.visualstudio.com/vs/msft-android-emulator/
Used that to download/install an API level 23 (6.0 Marshmallow)
emulator
Started that emulator using the same tool (you'll see it running in Hyper-V Manager)
Selected same emulator in VS for deploy/debug (the emulators that ship with VS are painfully slow)
In VS, selected Android project for start-up and verified build and deploy to Android in build config mgr.
Note: MS doesn't appear to have any emulators above API level 23, so Compilation and Target settings for your Android project can be the latest, but the minimum target will have to be 6.0 (API 23).

After pulling my hair for the past few days, I finally got my Xamarin.Forms Android App to show my page on the emulator. Thanks to all the members for their suggestions. Ryan's suggestion helped a lot ( I +1ed him, thanks Ryan) but did not solve my problem. I googled further and found a suggestion that asked to change the following setting which did it for me finally. So, if anyone else get stuck like I did, please do the following (in addition to cleaning up and updating all packages):
Open up the setting for your Hyper-V vm for your emulator (while the VM is off).
Expand the Processor node on the left and click on "Compatibility".
Now put a check mark on "Migrate to a physical computer with a different processor version" on the right.
Start your emulator in the Visual Studio Emulator tool.
Now, start debug your android project in VS using the same emulator that is already running.
After a delay (there is always a delay), your app will show up on the emulator. Yey!!