Develop Reference

How to complete delete old programm pathes. SDK location

I manually install(double click on downloaded pakage -> install button in my linux mint) Android Studio. Setted up the environment. And then i tried to run
npx react-native run-android
i got "No SDK found at the specified location" and "No emulators found". But i could run emulator manually in Android Studio with some example projects.
I suffered couple hours. And from command flutter doctor -v i saw diferent pathes
Android SDK at /usr/lib/android-sdk
Android Studio at /opt/android-studio
These paths are different from those where I installed. My SDK at /home/some_word/android/sdk path for example.
And editing $PATH in the .bashrk and .profile files doesn't change the paths I've seen in flutter doctor.
So how can i change this old program pathes?
Or how do I securely uninstall a program so that its paths are completely cleared?

it's enough to completely unistall
sudo apt-get purge package_name

Android command line tools Panic Android_SDK_root broken

For our QA team we need to provide an Android emulator without Android Studio.To do this I used the line tools command provided by Google.
I made this folder tree
kit-emulator
-android-sdk
-avd
in the android-sdk subfolder I put the line tools command folder and from this folder using the sdkmanager I download the sdk with this command
sdkmanager --sdk_root=C:\Users\EBERTGU\Desktop\kit-emulator\android-sdk platform-tools emulator platforms;android-30 system-images;android-30;google_apis;x86_64
The download goes smoothly.
The avd folder is designed to accommodate the newly created emulator. For that I use the avdmanager of command line tools with the following command
avdmanager create avd -n "a350" -k "system-images;android-30;google_apis;x86_64" -p "C:\Users\EBERTGU\Desktop\kit-emulator\avd\a350" -f -d "pixel_4_xl"
The emulator is created in the a350 folder contained in the avd folder. You may be wondering what's wrong then. It's s the launch of the emulator.
When I start the emulator with the command emulator #350 I have this error
PANIC: Cannot find AVD system path. Please define ANDROID_SDK_ROOT
Error which is explained by itself. So I set my environment variable ANDROID_SDK_ROOT to C:\Users\EBERTGU\Desktop\kit-emulator\android-sdk
I restart the commande line prompt and start again to start the emulator this time I got this error
PANIC: Broken AVD system path. Check your ANDROID_SDK_ROOT value [C:\Users\EBERTGU\Desktop\kit-emulator\android-sdk]!
Now I don't understand why it doesn't work. I searched and opened the emulator ini file inside I found the line
image.sysdir.1=android-sdk\system-images\android-30\google_apis\x86_64\
In despair I changed it to
image.sysdir.1=C:\Users\EBERTGU\Desktop\kit-emulator\android-sdk\system-images\android-30\google_apis\x86_64\
And when I try to start the emulator with the modified image.sysdir.1 line it works !
Anyone have an explanation of why launching doesn't work with base value for image.sysdir.1 and environment variable?
Thank you a lot
Have a nice day
Shindra Guillaume

I found the solution, it was the generation of the emulator from the avdmanager in the bin folder of command tools lines. Just put the files at the root of command tools lines in a subfolder and the system image is properly configured to match that of the root SDK

Android emulator errors with "emulator: ERROR: can't find SDK installation directory"

I am trying to install and run an Android Virtual Device from the command line on Windows (without Android Studio). I have set up an Android SDK in C:\Android, and successfully created an AVD with the command:
avdmanager create avd -n test -k "system-images;android-26;google_apis_playstore;x86" --abi google_apis_playstore/x86
I have environment variable ANDROID_SDK_ROOT set to C:\Android.
When I try to start the emulator from the command line with:
emulator #test
I get errors:
emulator: ERROR: can't find SDK installation directory
emulator: could not find virtual device named 'test'
I have also tried setting environment variables ANDROID_AVD_HOME and ANDROID_EMULATOR_HOME, and also tried running the AVD specifying sysdir and datadir with the command:
emulator #test -sysdir C:\Android\system-images\android-26\google_apis_playstore\x86 -datadir C:\Android\avd
but I get the same errors.
When I run command avdmanager.bat list avd, I get:
Name: test
Path: C:\Android\avd\test.avd
Target: Google Play (Google Inc.)
Based on: Android API 26 Tag/ABI: google_apis_playstore/x86
Why on earth can't I run the AVD?

I found the problem. Because I was trying to do a minimal Android SDK install via the command line, I did not yet have a platform-tools folder. Not being able to find the platform-tools folder was causing the emulator to display the unhelpful error "can't find SDK installation directory", which really meant "can't find the platform-tools directory".
Once I installed the platform-tools folder with sdkmanager --no_https "platform-tools", the emulator worked. I need --no_https because I'm in a crippled corporate environment.
For future reference, I installed the emulator dependencies (after unzipping sdk-tools-windows-3859397.zip from here) with:
sdkmanager --no_https "system-images;android-26;google_apis_playstore;x86" "platforms;android-26" "platform-tools" "emulator"

With the package "platform-tools", it may also required to install "platforms;android-26" for your Android 26.
Using sdkmanager.bat platforms;android-30 --sdk_root=C:\your_avd_sdk_root to install it.
If still not working, try to run command below:
set PATH=%PATH%;%ANDROID_SDK_ROOT%\emulator
set PATH=%PATH%;%ANDROID_SDK_ROOT%\emulator\bin64
set PATH=%PATH%;%ANDROID_SDK_ROOT%\platform-tools
set PATH=%PATH%;%ANDROID_SDK_ROOT%\cmdline-tools\latest\bin

Device list doesn't shows in Android Studio using Flutter

I tried to develop app using Flutter(using Android studio IDE).Add flutter plugin & flutter SDK in studio and Everything is configured but emulator / real time device are not listed. Its shows error like "Unable to list devices: Unable to discover Android devices. Please run "flutter doctor" to diagnose potential issues"
Ref link : https://flutter.io/setup-windows/#android-setup
https://flutter.io/get-started/test-drive/#androidsstudio

configure flutter in terminal to detect Android SDK and Android Studio:
$ flutter config --android-sdk /path/to/android/sdk
$ flutter config --android-studio-dir /path/to/android/studio
then restart Android Studio/Intellij.
source: https://github.com/flutter/flutter-intellij/issues/2113#issuecomment-383412308

If you configure flutter and android sdk both perfectly and you do not show the avd device list in android studio.
It's very simple way to show android emulator device list.
First create a new Android Emulator if already create you run the AVD manager then you can show the instead of emulator name
Before:
https://i.stack.imgur.com/6np0m.png
After:
https://i.stack.imgur.com/fiCYe.png

May be there is no AVD's to list down. And if emulator runnig, intelliJ will grab it.
In Android Studio, you can create a AVD using AVD Manager or using Terminal. Here is how you can do that using Terminal,
First, go to the android sdk installed directory -> tools
and copy the path and in the terminal type cd and paste the path and press enter. Now yo are in the tools directory.
Next, using terminal type:
emulator -list-avds - to list created AVD's(You should be in tools directory to run this command).
If there is a device type emulator -avd <name>. else you can create a one:
type cd bin then,
Use:
avdmanager create avd -n name -k "sdk_id" [-c {path|size}] [-f] [-p path]
As a example:
avdmanager create avd -n Nexus -d 23 -k system-images;android-23;google_apis;x86
Then again go back to tools directory by typing cd .. and type emulator -list-avds. This command will list your created AVD.
To run a AVD type:
emulator -avd <name>
About AVD.

Had the same problem after moving avd's to another disk.
I managed to solve by making ANDROID_HOME system variable to point to the android sdk path.

For mac users,
It was working fine yesterday. In my case I had this in .bash_profile
ANDROID_HOME = Library/Android/sdk
I changed it to,
ANDROID_HOME = /Users/rana.singh/Library/Android/sdk
.bash_profile has
export ANDROID_HOME=/Users/rana.singh/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
It worked.

android Failed to start emulator:Cannot run program

I have installed android SDK and android eclipse plugin successfully on Ubuntu.
Every thing was working fine until I removed Ubuntu and installed Linux Mint.
I installed the SDK again and used the same eclipse copy I was using on Ubuntu but now all the android applications contain errors and I can not start the emulator.
When starting the emulator this message appears
Starting emulator for AVD 'test' Failed to start emulator: Cannot run program "/home/anas/android//tools/emulator": error=2, No such file or directory
While the android SDK is installed in the specified path and the file (emulator) is exists in the same path.
Also all my applications contains the same error R can not be resolved to a variable
What is the problem here?

Installed on Ubuntu successfully.
but not running avd
If you're running a 64-bit system, you need to install ia32-libs
sudo apt-get install ia32-libs
R can not be resolved to a variable
This can be due to following Reason
class is not the part of that package add proper package
not properly defined in manifest file class path define it properly
clear and run the avd it will work

If cmd from fist comment doesn't work like in my case (64bit Crunchbang) then you may also try with :
sudo aptitude install ia32-libs lib32ncurses5 lib32stdc++6

I solved it doing a backup of the "emulator" and creating a symbolic link to the correct emulator:
mv emulator emulator_bup
ln -s emulator64-arm emulator

I used the command-line tool android (android avd), and used Tools->Manage SDK to install 64 bit emulators. I then mv'ed emulator to emulator.old, and emulator64-arm to emulator. Now the AVD starts up.

You do not need install packages any more!
In directory tools, there are many types of emulator, while my computer works with emulator64-arm! My system is Linux Mint 16 amd64! Good luck!
./emulator64-arm #yxphone -sdcard yxsd -scale 0.8

Like you have written the specified path and the files are exists in the same path, but i suggest to check that one more time.
and like you are getting R cannot be resolved to a variable, do not worry:
Reasons:
Check Package name in Manifest File
If you are already getting something like this: import com.version.bajrang.january.R;
so first of all try to change package name here, or secondly just delete this line and
clean your program
If you are not getting something like: import com.version.bajrang.january.R;
then add import packagename.R;
I believe that you will get your answer.....

It looks like your SDK path in eclipse has a mistake:
Cannot run program "/home/anas/android//tools/emulator"
That double "//" may be the problem. Check in Eclipse: Window -> Preferences -> Android. There should be a field there pointing the SDK Location. Edit it.
Check your path : /home/anas/android/ to see if it really is where you put your SDK . If not repeat these steps to have it
The missing R resource message is a compile error right? Then in this case your emulator should not be the problem. However, if your SDK path is incorrect like I suspect, then .. you can expect this compile error along with any other android libraries import

This is sorted by running this on Ubuntu.
sudo cp ~/Android/Sdk/platform-tools/adb /usr/bin/adb
Refer this: Can't connect to emulator through ADB genymotion