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ERROR: Module 'app': platform 'android-28' not found. and Design editor is unavailable until after a successful project sync

So, I am new here just installed Android Studio and then wanted to create a basic activity. But the thing is they want me to install the SDKs and Haxm which is not being installed through SDK manager. I have tried a lot and have used all the ways stated in Stack-overflow to get rid of this but none of their ways has functioned.

Go to Tools->sdk manager->install API Level 28 then restart.

go to Tools
Select SDK Manager
Under SDK Platforms select Android 9.0 (Pie) (API 28)
Then Apply and Download the API

I face the same problem.
First, install API Level 28 & Restart the Android studio.

First of all!
you need to update your sdk manager
that too essential tools are:
build tools
platform tools
tools
and android Emulator
.....
Now go to LOGCAT , click on configure sdk.....
put it to latest and click autoconfig button for each bar.
thats it rebuild it!
You are done with 100 percent% successful error solving,
Your Activity.xml file will be displayed with out any warning or error!

If you already opened a project, the "SDK Manager" can be found on the main screen
Then you can add the missing sdk.

After reinstalling and upgrading my android studio to android 4, I faced the same challnge. but what I did was to go to tool->sdk manager and then install some other APIs including the error messages API 28 not installed and it works fine.

Open Android Studio in order to see 'Welcome screen' (if a project will directly open, you can close it in order to go to the 'Welcome screen')
There is a 'Configure' menu in SDK manager (first option from drop down list).
Open then select the needed android SDK version(s), press ok and wait for downloads (it will take some time until everything is installed).
After this, when you open a project, the 'tools' menu is updated with all missing content.

I faced the same problem but I uninstalled android studio and reinstalled it while connected to the internet . it downloaded the updated SDK and other tools by its self . it works perfectly

Check the buildToolsVersion of your project in app level Gradle file.
Then check whether you have installed that sdk version. You can check it on AVD manager.
If you haven't buildToolsVersion sdk installed then install first and rebuild the project.
Ex. If your buildToolsVersion is 28 , you should install Android 9.0(Pie) - API Level 28 SDK.

Turn on Internet and open android studio in that select "Tools->sdk manager" and select api level 29, download and apply it.
Close android studio and open again 💯✨

No Android SDK found - Android Studio

I have a problem with Android 0.4.2 Studio, when creating a new application, it tells me there is a problem with the rendering and shows me the following problem:
Renderering Problems
No Android SDK found. Please configure an Android SDK.
My setup SDK and JDK is this: Android SDK location: C:\adt-bundle-windows\sdk, I put the path I use in Eclipse SDK, or there may be the problem, if someone has happened and what has been fixed, I'd like to give me the solution, thank you very much.

I just encountered and solve a similar problem.
First you should check the directory like other threads described. Then you can check whether the Build tool version matches your SDK version.
(e.g. for my project, in build.gradle file, you have:)
android {
compileSdkVersion 21
buildToolsVersion "21.1.1" }
and then open you SDK manager, make sure you have the same version of sdk(21.1.1) installed in the selected directoriy:
If not, install it and restart Android Studio. It works for me.
I've also seen other guys saying run Android Studio as administrator would also help:
https://teamtreehouse.com/forum/i-am-getting-this-warning-message-rendering-problems-no-android-sdk-found-please-configure-an-android-sdk

I got the same "No Android SDK Found" error message... plus no rendering for Design window, no little cellphone screen.
My SDK path was correct, pointing to where the (downloaded during setup) SDK lives.
During Setup of the SDK Mgr, I didn't download the latest "preview edition (version 20)"...(I thought it better to use the next most recent version (19)) Later I found, there was no dropdown choice in the AVD Manager to pick Version 19, only the default value of the preview, 20.
I thought "Maybe the rendering was based on a version that wasn't present yet." So, I downloaded all the "preview edition's (version 20)" SDK Platform (2) and system images (4)...
Once download/install completed,
RESTARTED Android Studio and Viola! success... error message gone, rendering ok.

From the File menu, choose Project Structure (if you're running 0.4.4 there's a bug and the menu item doesn't have a title, but it still works), and choose the Android SDK item. You should see something like this where you can set up your JDK and SDK.
After setting it, quit Android Studio and relaunch it for good measure.

i have just discovered, android studio 3.0.1 has no sdk during the installation. because during the installation, it doesn't give sdk as part of install able unlike in recent versions of android studio.

Don't worry just change the
build.gradle
ext.kotlin_version = '1.2.41'
to previous version.
It worked for me hope it works for you too.
Happy coding.

According to the Android Studio download page, the SDK comes bundled with Android Studio. It has its own copy when you install Android Studio.
ADT is a plugin for Eclipse. Try reading through that webpage to see if there is something that got missed when installing.
Here is the wording from the site, regarding ADT:
Similar to Eclipse with the ADT Plugin, Android Studio provides integrated Android developer tools for development and debugging.

I wanted to share a part of the issue I had because it is the first google result.
I installed Android Studio, when I tried to install my first SDK from the SDK Management windows I got the error that I didn't have any SDK installed.
I tried to look on the internet to manually download the .zip,manualy create the folder, no luck what so ever.
When I tried to run the Android Studio as an administrator it detected I didn't have any SDK and prompt me right away at startup to download a SDK.

Do following steps
a) Change minSdkVersion and sync gradle
b) Revert back your minSdkVersion and sync gradle again
It will be resolved.

These days, Android Studio setup do not provide SDK as the part of original package.
In the context of windows, when you start Android Studio 1.3.1, you see the error message saying no sdk found. You just have to proceed and provide the path where sdk can be downloaded. And you are done.

Here is the solution just copy your SDK Manager.exe file at the root folder of your android studio's installation, Sync your project and cheers... here is the link for details.
running Android Studio on Windows 7 fails, no Android SDK found

Try make New Project, and then choose same android version that you've installed sdk verions on "Target Android Device" dialog.
In my case, error message gone.

I had the same problem, Android Studio just could not identify the android-sdk folder. All I did was to uninstall and reinstall android studio, and this time it actually identified the folder. Hope it also works out for you.

Download android sdk through this sdk manager https://dl.google.com/android/repository/tools_r25.2.3-macosx.zip
(note this link is for mac)
open android studio, click next, open where it ask to add path where u downloaded sdk..... add it... click next, it will downloaad updates..... and it done

Right now, the last version of Android Studio bundled (Windows IDE bundle with SDK (64-bit)) with Android SDK is version 2.3.3:
https://developer.android.com/studio/archive.html#android-studio-2-3-3
which size is about 2GB.
You can use it and then upgrade to the latest version of Android Studio.

I am on Mac Os. In my case, my host file was black. I added following entries (these entries should be there by default, but they weren't).
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
After re-running android studio, it prompted the sdk download.

I fixed this bug changing the proxy configuration:
No proxy → Auto-detect proxy settings

How do you add an SDK to Android Studio?

I'm using Google's Android Studio 0.1 based on IntelliJ, and I cannot figure out how to add additional SDKs to my project.
I exported my existing project from Eclipse to a Gradle project, which I imported into Android Studio, as recommended by Google.
My project's SDK is Google APIs 2.3.3. However, I use a library called PullToRefresh which appears to need SDK 4.1, so I'm trying to add the SDK 16 to my project.
I've already made sure to download the SDK using the SDK manager. These SDKs are added to the Android Studio.app's sdk folder automatically.
I opened the Project Structure window, clicked "SDKs" under Platform Settings, and I currently see JDK 1.7 and Google APIs 2.3.3 shown. I click the + sign above that list to add a new SDK. I then navigate to the sdk directory that has android-16, as shown in the screenshot below. I am not quite sure what this wants me to add, but I've highlighted the android-16 folder (about the only thing I can select), and when I click "Choose," the window disappears, but no new SDK appears in the SDK list.
And here is a screenshot of my SDK Manager view, showing the installed SDKs:

I had opened a ticket also with Google's support, and received the solution. Instead of choosing the sdk/platform/android-16 folder, if you select the top-level "sdk" folder instead, you'll then be asked to choose which SDK you want to add. This worked!

You have to put your SDK's in a given directory or .app directory. You have to do it in finder while you are out of the application i'm assuming, but personally I'd use terminal in Mac instead of doing it in the App itself or finder. According to Google:
On Windows and Mac, the individual tools and other SDK packages are saved within the Android Studio application directory. To access the tools directly, use a terminal to navigate into the application and locate the sdk/ directory. For example:
Windows: \Users\<user>\AppData\Local\Android\android-studio\sdk\
Mac: /Applications/Android\ Studio.app/sdk/

You can change from the "build.gradle" file the line:
compileSdkVersion 18
to the sdk that you want to be used.

I had to restart Android Studio for changing the sdk after installing a new one. Then Android Studio asked me for configuring my SDK and let me do it.

And For linux(ubuntu)
/usr/share/android-studio/data/sdk

Download your sdk file, go to Android studio: File->New->Import Module

I followed almost the same instructions by #Mason G. Zhwiti , but had to instead navigate to this folder to find the SDK:
/Users/{my-username}/Library/Android/sdk
I'm using Android Studio v1.2.2 on Mac OS

For those starting with an existing IDEA installation (IDEA 15 in my case) to which they're adding the Android SDK (and not starting formally speaking with Android Studio), ...
Download (just) the SDK to your filesystem (somewhere convenient to you; it doesn't matter where).
When creating your first project and you get to the Project SDK: bit (or adding the Android SDK ahead of time as you wish), navigate (New) to the root of what you exploded into the filesystem as suggested by some of the other answers here.
At that point you'll get a tiny dialog to confirm with:
Java SDK: 1.7 (e.g.)
Build target: Android 6.0 (e.g.)
You can click OK whereupon you'll see what you did as an option in the Project SDK: drop-down, e.g.:
Android API 23 Platform (java version "1.7.0_67")

What Type of error is it? [duplicate]

When I boot up Android Studio and select "New Project..." and go through creating a new project, I get this popup error:
Failed to import new Gradle project: failed to find Build Tools revision 17.0.0
Consult IDE log for more details (Help | Show Log)
I would love to consult the IDE log, but I haven't even managed to get into the application to do much of anything. I've went through the preferences multiple times to see if I can set a path for the Build Tools, but I can't find much of anything. How do I fix this, or how do I get into the application without opening a project so I can at least see the logs?

After spending a few hours: I restarted the Android SDK Manager and at this time I noticed that I got Android SDK Platform-tools (upgrade) and Android SDK Build-tools (new).
After installing those, I was finally able to fully compile my project.
Note: The latest ADT (Version 22) should be installed.

As of May 2020, A really straightforward solution using Android Studio:
Open Android Studio
From the top, choose File > Settings > Appearance & Behavior > System Settings > Android SDK
click on the tab SDK Tools at the top. Then highlight Android SDK Build Tools from the list.
Check "Show Package Details" check box, choose the build tools version you need and then click Apply.

Look in the SDK Manager what is your highest Android SDK Build-tools version, and copy this version number in your project build.gradle file, in the android/buildToolsVersion property (for me, version was "18.1.1").
Hope it help!

This is what I had to do:
Install the latest Android SDK Manager (22.0.1)
Install Gradle (1.6)
Update my environment variables:
ANDROID_HOME=C:\...\android-sdk
GRADLE_HOME=C:\...\gradle-1.6
Update/dobblecheck my PATH variable:
PATH=...;%GRADLE_HOME%\bin;%ANDROID_HOME%\tools;%ANDROID_HOME%\platform-tools
Start Android SDK Manager and download necessary SDK API's

It happens because Build Tools revision x doesn't exist.
Today, the latest version is 23.0.2 (subject to change all the time).
The buildToolsVersions you want are included in the Android SDK, normally installed in the <sdk>/build-tools/<buildToolsVersion> directory.
Don't confuse the Android SDK Tools with SDK Build Tools.
Change in your build.gradle's buildToolsVersion to some version installed in <sdk>/build-tools
android {
buildToolsVersion "23.0.2"
// ...
}

Whenever you will try to run a project with build tool version not present in studio, You will face this error.
As of now in 2017, It has been made really simple by Android Studio.
It will prompt you about this issue, along with something like this
You just have to click on it and the system will download to the build version required to run the project.

I had the API 17 installed but that was not enough. What I really need installed is the "Android SDK Build-Tools 17".
You can locate your "Android SDK Build-Tools X" inside the first child, named "Tools", in the "Android SDK Manager".

in your Project perspective, look for Application --> build.gradle and edit this lines
android {
compileSdkVersion "android-N"
buildToolsVersion "24.0.0 rc1"
like this:
android {
compileSdkVersion 24
buildToolsVersion "23.0.3"

I had this problem recently, my project didn't include local.properties file.
Check local.properties file if it includes sdk.dir with correct path to sdk

i think you can download the latest android SDK and use it.i do this and fixed the problem and work well.
here is the link:
http://developer.android.com/sdk/index.html#download

Try to run gradle at the command line first. It might prompt you to setup and environment variable:
export _JAVA_OPTIONS="-Xms256m -Xmx1024m"
Read more here: 1, 2
Further make sure that the Android SDK build tools (adb, aapt, dx, dx.jar) are available in the PATH. If not you can create symlinks at the appropriate locations. They changed with the release of new SDK versions. Here is a shell script which creates the symlinks within the $ANDROID_HOME folder for you.

Basically error saying your are missing "Android SDK Build-tools" installed.

This worked for me after I tried many solutions:
For some reason the adb process didn't restart itself after installing new packages. Manually killing adb.exe and attempting to import the project another time solved this problem for me.

Uninstall the Android SDK Tools and then reinstall them from Tools > SDK Manager.

Android Studio - SDK is out of date or is missing templates

I downloaded Android Studio, fixed the JDK Environmental Variable, but when I try to create a New Project, I get an error that says
Your Android SDK is out of date or is missing templates. Please ensure you are using SDK version 22 or later.
I opened up android.bat in the SDK but it said I was already running version 22.
Anyone else getting this?

It just happened because you already have your SDK setted up for Android Developers Bundle with eclipse. Simply open your SDK manager in the ADT Bundle and update you Android SDK Tools from 21.1 to 22 and you are good to go.
Worked for me.

First of all, on Windows and Mac, the individual tools and other SDK packages are saved with the Android Studio application directory.
Windows: \Users\<user>\AppData\Local\Android\android-studio\sdk\
Mac: /Applications/Android\ Studio.app/sdk/
Make sure your android-sdk-path is correct and the sdk tool version is 22 or later.
Then open the Configure--> Project Defaults --> Project Structure, set your project sdk is Android SDK.
enjoy.

As for me, I make next:
Start Eclipse -> start SDK -> install selected packages
Eclipse -> Help -> check for updates -> update all
Android Studio -> configure -> Project Defaults -> Project structure -> Press plus -> Android SDK -> put path to the same sdk that you use in eclipse (run SDK and in top panel you can see this path).
Apply

I did all of the above and still got the ....missing templates blah blah. What worked for me was to go to Configure>Project Defaults>Project Structure>Project and select Android SDK, then Configure>Project Defaults>Project Structure>SDKs map the Android SDK home path to the sdk folder in the ADT bundle (for me it was C:\Users\home\Toolbox\adt-bundle-windows-x86\sdk).
I then selected Android 4.1.2 clicked apply and it worked.
I then went back to the Configure>Project Defaults>Project Structure>SDKs and then selected Android 4.2.2 and now that worked too (strange though as when I selected Android 4.2.2 first time the Apply button was grayed out)

I ran into this problem because I wanted to update from an old version. In doing this, I downloaded the latest version from the Project Tools Site, then unzipped and copied over my existing Android Studio install which did have the sdk folder inside.
Going back and looking at it, I see quite plainly that there was a note that I previously ignored:
NOTE: These .zip files do not contain an embedded SDK install. If you have an existing install of Studio which contains an embedded SDK, if you upgrade by installing one of these zips, make sure you copy over the SDK as well.
For OS X users, this means going to your old version of Android Studio (if you haven't copied over it yet) and right-clicking and selecting Show Package Contents, then copying the sdk folder that's inside, then putting that into the new version of Android Studio.
If, like me, you already copied over the old version, then you'll need to redownload the old version first which does contain the SDK.

They released a new sdk today. You need to update to it.

I was still hitting this, and figured it was due to something I had misconfigured (which turned out to be the case). The error message is a little confusing, too, because I believe that they are referring to is the version of the ADT tools, not the SDK. For example, the version of Android 4.3 (which is about the latest) is 18.
As of the latest source for Android Studio (which you can clone from here: https://android.googlesource.com/platform/tools/adt/idea), that message is generated from NewProjectWizard.java at about line 75 if TemplateManager.templatesAreValid() is false. And it checks that by looking for the existence of the file [rootTemplatesFolder]/gradle/wrapper/gradlew .
It gets the [rootTemplatesFolder] from the SDK(s) you specified in the "Project Structure" settings for default projects. In my case, I had several specified - both the new ones pointing to the sdk directory that's (thankfully) part of the Android Studio, and a few old ones I had somewhere else. I should not have included the old ones at all, but I'm a newb to this and the GUI let me do it. The NewProjectWizard was checking the tools area of that one first, which did not have that file, since the tools version with it was older than version 22.
I had to use dtruss to watch the system calls of Android Studio to see where it was looking for that file, at which point I could tell what my silly problem was.
I have a few more notes on this, including a screenshot of my particular misconfiguration, at http://www.nowherenearithaca.com/2013/08/solved-android-studio-and-your-android.html
Note: It seems you have to restart Android Studio for the "New Project Settings" here to take effect.

for ubuntu:
Open sdk manager from Android Studio or configuration.
make sure you download or update the latest release SDK and build tools.
Set the sdk location as (your android folder/sdk)
It'll download and install sdk

just Update sdk with sdk manager
it worked for me