Develop Reference

Unity3D: APK file missing

Every time I try and build my game, I am unable to find the APK file anywhere, I did however found the APK file in my recent folder, but it doesn't show up in the respective folders I initially selected or allows me to copy and paste the APK file into my Android device.
I don't even get any errors when the game is built (in fact, I get a message in my console stating that my build was successful) so I am confused to why my APK file is not showing up.
It happened after I recently updated my unity 5.6 to unity 2018.3.1 due to Oracle JDK is no longer free for commercial use and unity 2018.3 uses OpenJDK (I am using AdoptOpenJDK/JDK-12.0.1.12-hotspot). Once unity was installed, I didn't receive any errors only a few warnings within a few scripts (which was only a minor problem and I could solve easily).
However, when I go to player settings, I get this one warning: "failed to get available Android API levels. Make sure your Android SDK tools version is 25 or higher and you have an internet connection."
I made sure that my minimum API level is Android 8.0 'Oreo' (API level 26) and the target API level is Android 8.1 'Oreo' (API level 27), I also uninstall Android studio and reinstalled.
I even went as far as deleting all folders inside build tools and platforms from (appdata>local>android>sdk>buildtools) & (appdata>local>android>sdk>platforms) and updating the files for continuing the build.
However, all the methods I've tried have not to work, so I'm asking for help here. Please, does anyone know why is my APK file not appearing at all? Thank you in advance, I really appreciate it! :)

this solution helped me if Are you using the r22 of android SDK, if so, Google decided to move the aapt.exe from tools directory to build-tools//aapt.exe
A quick solution for this is co copy the aapt.exe file from build-tools and paste as shortcut on tools directory. Keep the shortcut name as aapt.exe
another solution is to download jdk(1.8 version is prefered)from oracle site ["http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html"]and set it instead of the build-in jdk form the project preferences then reboot

Gradle Project Sync Failed - Android Studio

I have been working on an android app through android studio for about a month now. I recently got a new computer, and tried to open the app files on that computer. When I open it I get an error banner saying
Gradle Project Sync Failed. Basic functionality (e.g. editing, debugging) will not work properly.
When I click the try again button the error in the console reads the following:
Error:failed to find target android-21 :
C:\Users\compu\AppData\Local\Android\sdk
Install missing platform(s) and sync project
I don't have access to the computer I created this project on. Is there a simple way to fix this?

Try launching SDK Manager from AndroidStudio's menu icon then install Android 21 packages.

You need to download android-21 api
go to android sdk manager and download api 21

This is because you might be building a project say Android 5.1 , but you don't have the required SDK i.e. API 21.
Go to your SDK manager and check if you have the required SDK downloaded. For safety download API 21, and 22 and then create the program again and see if you still get the error
or change the target from settings which is available at yours machine.
Also where exactly have you put the SDK bundle folder the one you downloaded from Android website? On your desktop?

Android Studio no installation wizard

I have downloaded the latest Android Studio and when I run studio64.exe it opens Android Studio as a standalone application, however I would like to install it to my system.
The website says there is an installation wizard however I get taken straight to the Android Studio start screen. Is there still a way to install it on a Windows machine?

Turns out that Android Studio is now portable - like Eclipse. In other words, there is no installing, you just get the zip file, which contains everything you need, such as the executables that run Android Studio. You'll need to store this folder somewhere relevant and create a shortcut to the studio(64).exe file to run it from desktop/start menu.
The SDK is also no longer bundled with Android Studio, so that will need to be downloaded separately.
As of this post the Android Studio installation instructions by Google are out of date.

you can get the sdk manager as stand alone installer.once installed you need to run it as "administrator", than only it will be able to download and install packages and api's. follow the given below link:
http://dl.google.com/android/installer_r23.0.2-windows.exe

Check if its in compatible mode with your OS version of your machine. Right click on the downloaded bundle > Move to properties> Compatibility tab> Select Compatibility tab> Tick the check-box- Run in Compatibility mode> Select your OS version from the drop down.
You will get the set up wizard :)
Worked for me :)

Android Virtual Device Manager - Certain Targets not Available

I am following a basic MyFirstApp tutorial for creating an Android App, but am having trouble getting the emulator to work. I am using Eclipse (on OS X) and was told to go to the Android Virtual Device Manager and select an AVD name, select Nexus 7 (2012) (7.0", 800 x 1280: tvdpi) as the Device name, and select Android 4.2.2 (API 17) as the device target. Problem is, even though 4.2.2 has been installed, it is not showing up on the list.
The only target option I currently have available is Android 4.4W - API Level 20. In addition to that, the CPU/ABI option is greyed out, saying "No system images installed for this project." The OK button is also greyed out. According to the SDK manager, though, everything necessary for 4.2.2 and 4.4W has been successfully installed.
I have Eclipse and Android Studio installed, and have used both (though not successfully when it comes to emulators). Could that have caused an issue?
I am new to this and would appreciate any help in getting the emulator working. I've tried everything I can think of and every search I can think of, so now I need someone to help me out. Thank you!

try either :
restart eclipse
install ARM EABI v7a System Image under the Android 4.2 section from the SKD manager

Unable to create Android Virtual Device

For some reason, the OK button is not clickable when I try to create an AVD. Does anyone know what I'm doing wrong?

Simply because CPU/ABI says "No system images installed for this target". You need to install system images.
In the Android SDK Manager check that you have installed "ARM EABI v7a System Image" (for each Android version from 4.0 and on you have to install a system image to be able to run a virtual device)
In your case only ARM system image exsits (Android 4.2). If you were running an older version, Intel has provided System Images (Intel x86 ATOM). You can check on the internet to see the comparison in performance between both.
In my case (see image below) I haven't installed a System Image for Android 4.2, whereas I have installed ARM and Intel System Images for 4.1.2
As long as I don't install the 4.2 System Image I would have the same problem as you.
UPDATE : This recent article Speeding Up the Android Emaulator on Intel Architectures explains how to use/install correctly the intel system images to speed up the emulator.
EDIT/FOLLOW UP
What I show in the picture is for Android 4.2, as it was the original question, but is true for every versions of Android.
Of course (as #RedPlanet said), if you are developing for MIPS CPU devices you have to install the "MIPS System Image".
Finally, as #SeanJA said, you have to restart eclipse to see the new installed images. But for me, I always restart a software which I updated to be sure it takes into account all the modifications, and I assume it is a good practice to do so.

Had to restart the Eclipse after completing the installation of ARM EABI v7a system image.

This can happen when:
You have multiple copies of the Android SDK installed on your machine.
You may be updating the available images and devices for one
copy of the Android SDK, and trying to debug or run your application in another.
If you're using Eclipse, take a look at your "Preferences | Android
| SDK Location". Make sure it's the path you expect. If not, change
the path to point to where you think the Android SDK is installed.
You don't have an Android device setup in your emulator as detailed in other answers on this page.

For Ubuntu and running android-studio run to install the packages (these are not installed by default):
android update sdk

I had the same problem while creating AVD with 4.2.2 images, I resolved it by doing the following :
Check if there exist a "default" folder in adt-bundle-windows-x86_64-20131030\sdk\system-images\android-17.
If it exists then move the contents(downloaded system images) of the "default" folder to
adt-bundle-windows-x86_64-20131030\sdk\system-images\android-17.
Hope this helps.

I want to update this question with a screenshot of a recent Android Studio. It took a bit of poking around to find where to install new system images.
You get to the SDK Manager through one of two paths.
Option 1. Tools > Android > SDK Manager
Option 2. Android Studio > Preferences > Appearance & Behavior > System Settings > Android SDK (This is for Mac; adapt for others.)
In the pane "SDK Platforms," check the "Show Packages" box to see the system images.
Select the ones you want, click "Apply" and voilà!

I had to move the folders inside a folder named "default" to the android-## folder so Eclipse could see the images.

There is a new possible error for this one related to the latest Android Wear technology. I was trying to get an emulator started for the wear SDK in preparation for next week. The API level only supports it in the latest build of 4.4.2 KitKat.
So if you are using something such as the wearable, it starts the default off still in Eclipse as 2.3.3 Gingerbread. Be sure that your target matches the lowest possible supported target. For the wearables its the latest 19 KitKat.