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How to update to SDK 24.0.2

SDK Platforms
SDK Tools
[![enter image description here][3]][3]

You can even update to the latest by changing the build tool in build.gradle file, but as you said you are pretty new and firstly just want to run this project by installing the build tool version 24.0.2
Please click on Show Package Detail of your second screenshot then you will start seeing all the other build tool version you can install and you will find your 24.0.2 as well like I started seeing that after selecting the Show Package Detail.

Go to Tools > SDK Manager.
Make sure Android SDK Location matches your local.properties file sdk.dir value. (Fix it in the file if required)
In the SDK Platforms tab, check an install Android 7.
In the SDK Tools tab check and install 24.0.2.

make sure you have internet connection and build the project again.
On the main menu click Build > Make Project

How to fix "JAVA_HOME environment references a directory" in unity3d

I have a problem showed on this screenshot:
Android Resolver
JAVA_HOME environment references a directory (C:\Program
Files\Java\jdk1.8.0_212) that does not contain java which is required
to process Android libraries.
The problem has appeared when I imported GoogleMobileAds package to insert AdMob ads to my project. I tried to create 2 local variables "JAVA_HOME" and "PATH" in environment variables using this guide https://null-code.ru/solution/157-reshenie-exception-jar-not-found-windows.html , but it doesn't help me.

It is a Unity bug. To fix:
Edit->Preferences->External Tools
Uncheck Android SDK Tools Installed with Unity (recommended)
Press Browse -> It might update the filepath
Recheck Android SDK Tools Installed with Unity (recommended)
Then:
Assets->Play Services Resolver->Android Resolver->Resolve
This has been tested and works with Unity 2019, Unity 2020, and Unity 2021.

try
Assets-> Play Services Resolver-> Android Resolver-> Delete Resolved Libraries

check is your Java set true or not:
go to cmd and type JAVA -version
if this appeared means your JDK is set if not check this link: https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html
after these, if you have the problem again update your JDK
from https://www.oracle.com/technetwork/java/javase/downloads/index.html

i was using admob plugin in my project and this is how i resolved the issue after trying all given solutions.
reimport the admob plugin / plugins you are using in your project. (i just reimport the latest version of admob plugin and issue resolved)

For me it was similar to this answer https://stackoverflow.com/a/57361245/2149955 but just a bit different so sharing a separate answer for when you haven't installed the tools through unity hub.
In Unity:
Edit->Preferences->External Tools
See error messages "You are missing the recommended <TOOL>. Install the recommended version using Unity Hub"
In Unity Hub:
Installs -> My Unity Version -> ... -> Add Modules, Twirl open Android Build Support -> Check Android SDK & NDK Tools (I also checked OpenJDK)
Press Next -> Accept Terms
Wait for install to finish
After that finishes, back in Unity:
If you look in external tools again, the error messages will be gone
Assets->Play Services Resolver->Android Resolver->Resolve

Update to Unity 2019.4.10f
fixed it

When I wanted to make an app for Android, I got this and many more as errors. Nothing worked, including the solutions here. I tried both Unity versions 2020.3.5f1 and 2019.4.22f1, it didn't work.
I figured out that the problem was due to "Android Built Support" not being fully installed. I did the following and the problem was gone:
Unity Hub (my version 2.4.3) -> from the left menu, go Installs
Click the 3 dots in the upper right corner of the Unity version you want (I used 2019.4.22f1) -> Add Modules
From Platforms, find "Android Built Support"
Its check box was checked because I installed it before, but if you don't have it, first install it
Display its submodules with the arrow to its left; "Android SDK & NDK Tools" and "OpenJDK"
Check their check boxes, next and install
Restart Unity
When you open the project, it resolves
It gave me another warning after the resolve, so I made sure that the problem was gone by doing "Assets->External Dependency Maneger->Android Resolver->Force Resolve" in the project again.

I faced this error when I wanted to build for Android. The reason I have faced this is that I had 2 Unity versions (2019.4.9f1 and 2020.3.3f1), and my JAVA_HOME was configured to use the java folder inside 2019.4.9f1. I then uninstalled and removed 2019.4.9f1, and after that, I got this error when trying to build in 2020.3.3f1.
I changed my JAVA_HOME variable permanently, following the link below:
How to set JAVA_HOME in Mac permanently?
Restarted my Macbook.
Went to Unity -> Preferences -> External tools, unchecked NDK, JDK, etc., clicked the Browse button that appeared, and selected the folder under 2020.3.3f1 manually for JDK.
(In the end, no folder should change when you uncheck and check again)

Simple fix. I got this message about Missing the JDK. If you have one that is similar or pointing to the wrong JDK you can try this fix.
Here is the Error I was getting:
I solved this by:
In Unity goto "Edit->Preferences->External Tools"
Unchecked the box "JDK Installed with Unity (recommended)", and noticed that the Path was pointing to an Old version of Unity I had uninstalled.
Changed the Path to the current version of Unity I am usings, OpenJDK directory.
Re-checked the box "JDK Installed with Unity (recommended)"
Then was able to build my game, and build to my android phone just fine.
Note: If your having problems with the SDK or NDK you could try this solution, by unchecking, and re-checking their respective boxes.

This Worked For me:
If u had rectified
JAVA_HOME,
JDK SDK files &
every possible way and solution does not show up try
preference -> in android untick the JDK installed..,
if you see a change in directory then just re tick,
copy path of JDK and uncheck,
finally paste the path close(x) preference TRY BUILD & RUN
Next time you open Unity Editor then try to check & uncheck JDK we have to see the same directory both ways

there is no sdk if you install unity editor without hub.
it seems unity want to use the versions they want. so it's very poor support for previous historty version.
there is a workaround. you can install a version offically recommanded.
and then copy the sdk, ndk, openjdk folder from the offical version folder to the folder you are using. for windows, these folder is like this:
from:
C:\Program Files\Unity\Hub\Editor\2021.3.21f1c1\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK
to:
C:\Program Files\Unity\Hub\Editor[your_version]\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK

Cannot update eclipse ADT to 23.0.3 even after trying everything found on google

I am using eclipse for the first time. I copied an adt-bundle and everything worked fine until i connected to the internet. Then every time I open eclipse it says
This Android SDK requires Android Developer Toolkit version 23.0.0 or above. Current version is 22.6.2.v201403212031-1085508. Please update ADT to the latest version.
I tried to update by going to help>install new software
and used both options
1.archive(by downloading plug in) and
2.work with 'https://dl-ssl.google.com/android/eclipse/'
but end up getting the same error
Cannot complete the install because of a conflicting dependency.
Software being installed: Android Development Tools 23.0.3.1327240 (com.android.ide.eclipse.adt.feature.feature.group 23.0.3.1327240)
Software currently installed: Android Developer Tools 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.product 22.0.5.v201307292155--757759)
Only one of the following can be installed at once:
ADT XML Overlay 23.0.3.1327240 (overlay.com.android.ide.eclipse.adt.overlay 23.0.3.1327240)
ADT XML Overlay 22.6.2.v201403212031-1085508 (overlay.com.android.ide.eclipse.adt.overlay 22.6.2.v201403212031-1085508)
Cannot satisfy dependency:
From: Android Development Tools 23.0.3.1327240 (com.android.ide.eclipse.adt.feature.feature.group 23.0.3.1327240)
To: overlay.com.android.ide.eclipse.adt.overlay [23.0.3.1327240]
Cannot satisfy dependency:
From: Android Development Tools 22.6.2.v201403212031-1085508 (com.android.ide.eclipse.adt.feature.group 22.6.2.v201403212031-1085508)
To: overlay.com.android.ide.eclipse.adt.overlay [22.6.2.v201403212031-1085508]
Cannot satisfy dependency:
From: ADT Package 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.feature.group 22.0.5.v201307292155--757759)
To: com.android.ide.eclipse.adt.feature.group 22.0.5
Cannot satisfy dependency:
From: Android Developer Tools 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.product 22.0.5.v201307292155--757759)
To: com.android.ide.eclipse.adt.package.feature.group [22.0.5.v201307292155--757759]
I tried everything, like uninstalling current adt and then installing, installing one at a time, copying files from tools/proguard etc. Nothing worked. Can somebody please help me?

This happened to me couple of times....This happens when you update eclipse ADT. There is nothing you can do to fix it other than download a fresh copy of eclipse ADT .Switch to Android studio . It get updates more frequently and it's easy to code using it. Android studio is still behind eclipse ADT but Google is updating it faster to change that.

Delete the adt folder and install eclipse as given below
Steps for updating eclipse
1. Download eclipse from the official site
2. Download and install jdk latest version
3. After installing the eclipse , Go to Help > Install New Software.
4. Click Add, in the top-right corner.
5. In the Add Repository dialog that appears, enter "ADT Plugin" for the
Name and the following URL for the Location:
https://dl-ssl.google.com/android/eclipse/
6. Click OK.
7. In the Available Software dialog, select the checkbox next to Developer Tools and click Next.
8. In the next window, you'll see a list of the tools to be downloaded. Click Next.
9.Read and accept the license agreements, then click Finish.
10. If you get a security warning saying that the authenticity or validity of the software can't be established, click OK.
11. When the installation completes, restart Eclipse.

Google adt/gwt support for eclipse 4.4 (Luna)

Have anyone gotten the release version of eclipse 4.4 to work with adt(Android development) and/or google web toolkit(gwt).
It seems like the gwt/adt plugins don't works with eclipse 4.4, so is there a secret place to download new versions or should I keep using 4.3 -(
Edit:
The reason I thought adt was not working was that the documentation(http://developer.android.com/sdk/installing/installing-adt.html) says that the plugin is called "ADT Plugin" which it is not.

Google just released its official SDK for Eclipse Luna: https://developers.google.com/eclipse/docs/getting_started

For adt ,
help -> Install new Software ->
https://dl-ssl.google.com/android/eclipse/ -> don't select everything
(it worked that way for me) i selected everything except Native development tools(i guess you don't need them if you debelop in java) and it's working well for me .

well… the gwt plugin actually can not work with luna release since it has a bundle dependency for eclipse core.runtime [3.8.0,3.10.0), here, ")" means it NOT includes 3.10.0 wihich is used in luna, however, it can been get rid of by modifying the osgi bundle file and then it will works fine with luna ,at least for me for now.
1 download the last update site zip file from google eclipse plugin site
2 unpack it
3 then you will need to modify 2 files firstly
an osgi META INF/manifest file included in a jar named *gdt*e42 (sorry, forget the full name, you can find it when you are trying to install the plugin, luna will complain that some dep bundle is missed)that is located in plugins dir, just change core.runtime version from 3.10.0) to 3.10.0]
another one should be contents.jar (maybe artifacts. jar), same above
now you can install the plugin if you have already have the eclipse RCP installed
however, install will failed because the md5 hashing is changed,
finally, copy the expected md5 from error message dialog to replace the old md5 value in artifacts.jar(maybe contents.jar)
now reinstall the plugin ,it should work for now
UPDATED:
maybe you should remove the bundle-version from MANIFEST.MF at com.google.gdt.eclipse.platform.e42 jar
and change the version to "0.0.0" from content.xml at content.jar

If you are using the Help----->Install New Software option, you might encounter this error message just like i did trying to install the Android plugin.
An error occurred during the org.eclipse.equinox.internal.p2.engine.phases.CheckTrust phase.
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.CheckTrust, operand=, action=).
Error reading signed content.
error in opening zip file
My solution was to go through Help-->Eclipse Marketplace and then search for "Android" Select the plugin from the search result and install it from there.

Eclipse Incorrectly Claiming I have old Rev of Android SDK

Just to preface this I have searched high and low on the internet trying to find an answer to this problem and have yet to find one, there have been people with similar problems as me but not quite the same.
I have been trying to set up Eclipse with the Android SDK. I installed Eclipse (Classic) first and edited the .ini file to find the correct javaw.exe file. I tested eclipse and it was working fine. Then I downloaded the android sdk bundle extracted it and used the SDK manager to download the necessary SDK tools (Rev. 21) and the Android 2.33 API. After finishing that, I went back into Eclipse, clicked "Install New Software" and in the "Work With" field typed
"https://dl-ssl.google.com/android/eclipse/". From there I installed the Developer Tools and NDK plugins and then when finished restarted Eclipse.
Now when I start Eclipse I get the following error
"This version of ADT requires Android SDK Tools revision 21.0.0 rc9 or above.
Current version is 11.0.0
Please update your SDK Tools to latest version"
I know for a fact I have rev 21, it said it when I downloaded it and when I try to go in and update anything whether it be through Eclipse or through the manager it says there are no updates available. I know I have the latest of both the SDK and ADT and I have also tried using the version of eclipse that came with the sdk but that gives me the same issue.
The only other things which seem to set off red flags to me are
1. When the program loads it shows the following message in the console
"[2012-12-01 18:31:48 - Dex Loader] SecurityException: Unable to find field for dex.jar"
2. When I try and open the SDK manager through eclipse it never opens and the console displays the following message
"[2012-12-01 18:37:07 - SDK Manager] [SDK Manager] Error: Expected verb after global parameters but found 'sdk' instead."
I don't know if either of those two have anything to do with what is causing this issue but I hope someone knows what is going on. If someone could help me figure this out I would greatly appreciate it, thank you in advance.
(For reference sake, I have been following the instalation instructions in this tutorial
http://youtu.be/31cxmLN09ss)

When in the SDK Package Manager, try choosing Packages menu -> Reload. Then you should see Android SDK Tools rev21 available and ready to be updated.

i had the same problem. it occurred because once when I was trying to install the adt plugin few months earlier, the location had been saved. I oversaw the old folder location, mistook it for the current updated one and bam! that was all the reason. try to check back the location for tools folder specified.

As follow up to my previous suggestion, better solution is to modify your sdk location in Windows->Preferences->Android to where you install your ADT bundle. For example, if you install your ADT Bundle under C:\Tools\adt-bundle-windows-x86-20130219, enter C:\Tools\adt-bundle-windows-x86-20130219\sdk.
Doing this also fixes other issue with "Android SDK Manager" not launching from within Eclipse discussed on another thread.

I resolved the issue with Eclipse reporting that I have an older sdk even though I have the latest installed by copying the correct sdk version under "C:\Program Files\Android\android-sdk". First save existing "C:\Program Files\Android\android-sdk\sdk" to say "C:\Program Files\Android\android-sdk\sdk_old", in case you need to revert.

This (above) is sound advice: however I went in eclipse and redefined the android sdk location which apparently was on a different android folder for whatever reason which had outdated files in it and I believe now the situation is fixed I tried it and it worked for me too. Thanks.