Develop Reference

Why Android studio won't run app on Android Pie (9.0)?

I've upgraded my Google Pixel to Android 9.0/Pie.
When I try to run an application from Android studio I don't see the Google Pixel in the list, there's only a null device named FA69R0306649. When I run my application, Android studio tries to install the app but then fails.
It looks like Android Studio is not recognizing the phone anymore. It Worked perfectly fine a couple of hours ago under Oreo (8.x).
Also, if I deploy the app on google play as alpha and then download it runs perfectly under 9.0/Pie.
Any suggestions to get the run/debug working with android 9.0 phone under Android Studio (3.1.4)?

The Pixel running 9.0 requires USB 2.0 high speed.
Apparently the Pixel running Android Pie cannot talk to the PC using neither USB 3.0 nor USB 1.1 full speed nor USB 2.0 running at full speed.

I had a similar problem with my Xiaomi Mi A1. When I upgraded from Android 8.1 to 9 Android Studio would hang on "Installing application" forever.
After trying revoking USB debugging authorization and completely reenabling developer options with no success it turned out a simple restart did it.
Looks like there are multiple issues that lead to the same problem.

I had the same issue with a Xiaomi Mi A2 after upgrading to Android 9. If you are using Linux, try adding the udev permissions manually, following the steps described here. In my case, that was the only solution that worked.

Please re-enable developer options again after the OS version upgrade, the device name will appear and it will be working fine again

Install Sdk Platforms of Android 9. In Android studio Top Right besides Search Icon.Press That Icon of SDK manager and look either sdk platform is updated and installed.

A simple solution just go to your Developer option on your phone , right below the USB Debugging option it says to "install via USB" just enable it and you are all set to install an app through android studio into your 9.0 device.

How to develop android apps with xamarin without hyper v and emulator

I am using windows 10 home and visual studio 2017. I want to develop android apps with xamarin. Hyper-V feature is not available on windows 10 home and I can not afford pro version, So emulator is not installing without hyper-v.
What should I do to develop android app?
Have anybody idea to deploy android app without using emulator and hyper-v?
Thank you in advance!

It's possible to develop Xamarin app without using the emulators. But in that case you'll need to have an Android device to deploy your app on.
Setup Android SDK Manager on your system. Although Xamarin includes a
SDK Manager, you can download it from the following link. Android SDK Manager download
Setup the ADB (Android Debug Bridge) on your system (install Google USB Drivers)
Connect your Android device to the system after you enable USB Debugging(Developer options) on it. Once the device is connected it will give you a prompt to enable debugging. Tap yes and you'll see the option to build to your device as shown in image.

You can try to use any avaliable on windows android emulator. I like to use Bluestack (https://www.bluestacks.com), the steps for use it below:
Install Bluestacks emulator
Launch emulator and wait for load finished
It's your wellcome screen, your application and apps from store will be here
Go to settings > Preferences and check "Enable android debug bridge (ADB)" + "Enable Android input debugging"
One time Setup finished
"Open android adb command promt" and type
adb connect 127.0.0.1:5555
If you have done everything good you will be connected to emulator and ready to debug your application
Good luck!

UPDATE:
As of visual studio 2019, non-hyper v emulation has been stopped.
Old Answer
I am very positive that at the time of VS installation the Visual studio emulators for Android are readily available for download and use, there you can find a good amount of android emulators also it provides you with Android SDK which again can be used to create Android emulators without using Hyper-V
The below link contains all you need to know about Visual studio emulators including on how to install :
https://msdn.microsoft.com/en-us/library/mt228279.aspx
Hope this Answers your question.
Goodluck!

Android device not recognized by android studio

I have 2 android devices. One is samsung tablet and the other one is general mobile discovery phone. Android studio recognizes samsung tablet when i choose debug mode and I successfully run my simple applications on the tablet. However the studio doesnt recognize my phone. Im using Win7 and my pc recognizes the phone to copy files from/to. Can you suggest any solution?

Sure that you have installed in your TOOLS:

This is similar to an answer I submitted before.
Android error No, minSdk(API 19) > deviceSdk(API 1)
There are a few things to check.
if you go to the terminal window in Android Studio and cd to the path where your sdk platform tools are installed (something like C:\Android\SDK\platform-tools ) and run the following command
adb devices
Do you have a device listed? If not then you don't have the device setup properly, or the correct drivers.
On the phone make sure that you have developer options enabled (go to settings->about phone and click on the Build Number 7 times or so)
Once you have enabled that go into the develop options under settings and make sure USB debugging is enabled.

If you are using Mac or Windows then try PdaNet, this tool works with most devices and really useful if you are using devices by regional or country based manufacturers.

Maybe your PC not install the driver for the mobile device. Try download UniversalAdbDriverSetup6.msi from http://hexamob.com/news/download-android-usb-drivers-for-onda/

Deploy Qt 5 QML application to a real Android device

There are many tutorials how to build an application with Qt for Android.
So I do it in these steps:
Installed Android SDK, NDK, JDK and Apache Ant
Installed Qt 5.2 for Android
Created simple QML application.
Configured virtual device from AVD Manager
I tried to run it and it bringed up Emulator window with my app. OK, it is going as expected.
Now I want to run it on real device. I have Samsung Galaxy Tab 2 10.1 P5100 so I enabled USB debug and connected it to PC.
But when I run the application, in "Select Android device" window I see only emulator, not real device.
So how can I run the application on real device?

The easiest way is to follow the documentation
http://doc-snapshot.qt-project.org/qtcreator-2.8/creator-deploying-android.html
Using Ministro to manage having apk to deploy on real device is especialy a good point.
Hope it helps.

qt for android doesn't find my physical device

I'm trying to write android applications with Qt5.1. I installed everything according to these instructions and I wrote my application and built it successfully. My problem is that when I click run on android version, instead of running the application on the device that I have connected or even asking whether I want to use the virtual device or physical device ( like eclipse does ) it just opens ADV.
I know I have connected my device properly because I can run applications I write with eclipse on my device. But not with Qt.
Can anybody help me?
Just in case you need to know I'm using the latest version of ndk and for sdk I'm using the one that comes with adt's latest version. If any other information I should provide please let me know.
thank you

I have had this problem as well, your device is not corresponding with the QT run settings. When you press run (probably in QT Creator?) it will search for devices which allow the application to run on.
There are a few possibilities when it comes to this:
Your device is not set up correctly:
run "adb start-server" and then "adb devices" in your command prompt. Does it say it found 1 device with status: "device"? If not your device probably doesn't have USB debugging enabled (you can enable this in the dev settings on your device).
You are building in the wrong mode:
Make sure you are creating a program for ARM (ARM GCC 4.7 QT 5.1 for example).
Deploying for the wrong API level:
Are you running the program on a device that supports API level 17 ? If not you can change these settings (API Level) in your QT project settings.
You don't have the recent API level installed:
Start the android sdk manager and download + install the new API's.
It worked for me after performing these steps, should you have any other difficulties feel free to ask!
Edit
If these steps did not work check if your android sdk is located in a location with write permission.