Develop Reference

Module not specified after opening project from another computer

I keep my projects in my Dropbox folder. I installed Android Studio on my laptop and I tried to open the Project. All java files had a red circle which I managed to fix by marking the Directory as Sources Root. When I try to run the application, the Edit configuration window pops up with a sign at the bottom saying that Module is not specified, in red. There is no module I can select in the appropriate combobox. Syncing project with grandle files has no effect and importing the project instead of opening it makes things even worse. At the Projects side tab, by selecting the Android option, I can only see the Grandle Scripts structure and not the project files. The project files are visible when I select the Project option from the combobox.
The project cannot even open at the original computer anymore. I am new to Android and I have spent a lot of time developing this project. What can I do to reverse the situation?

You have to change some gradle properties.
First you open android studio and create a new project. Then change your old project's all gradle properties according to new project. like bellow--
Go to your build.gradle(Module:app) script and change the gradle version like compile 'com.android.support:appcompat-v7:25.3.1' to your current version.
Go to your build.gradle(Project:your app) script change this line classpath 'com.android.tools.build:gradle:2.3.0' to your current version.
Finally you have to change gradle-wrapper.properties(Gradle Version) distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
to your current version
Now sync your project, I hope it will working fine.

Android Studio - Android Project View is Missing

I've found some webpage but it does not guide me back to normal android project view.
http://developer.android.com/sdk/installing/studio-androidview.html
I did File => Other Settings => Default Project Structure => Default Settings => OK It make even worse, import library become not function-able.

I also had this problem (creating new project also looked similar to IntelliJ IDEA), got it fixed when I enabled some Android-related plugins.
Go to Preferences (Settings on Windows and Linux) > Plugins and enable Android Support, at a minimum.
Now you will have "Android" option in the Project View.

Try:
View -> Tool Windows -> Project OR the shortcut is alt+1.
If that's not working try:
Window -> Restore Default Layout OR the shortcut is shift+F12.
Also, check that Studio is up to date:
Help -> Check for update...

None of the above solutions worked for me so I fixed this by removing the .gradle and .idea folders from my project.

The square at the bottom left corner of android studio lets you spread the screen or it populates it with side menus.

For me, it happened when I used Kotlin KTS for Gradle files, but created a java library module for this project. After trying to reimport project I got an error:
New Gradle Sync is not supported due to containing buildSrc module
Solution:
Migrate added module to kts
Remove created by Wizard settings.gradle, if you already use settings.gradle.kts
Reimport project
File -> Close project
Android Studio: import project
Show it your current project location

Just had the problem happen to me again. I got the problem solved, but unfortunately I can't confirm the solution, now that it's fix; but I have strong suspicions on what was the cause.
In my case, the problem occurred as a result of reorganizing my project directory. My projects are stored in given directory lets call it "Projects". I renamed that fold to "ProjectsBackup" and created a new "Projects" directory. I then moved selected projects now contained in the "ProjectBackup" directory to the new "Projects" directory. After moving the first project, I used Android Studio to open that project. That's when the problem occurred. I got a message that it couldn't find the gradle-wrapper and offered me the choice to create it. The gradle-wrapper is stored in a directory call "gradle" and its stored in the "Projects" directory. I had not copied that directory over from the "ProjectsBackup" to the new "Projects" directory. At the time, I thought nothing about that since, a new one was created. After trying all the various suggestion in this problem discussion, android studio offered a notification from me to update my "android gradle" plugin. I did the update and after that the "android" view was now available for me to select. The android gradle update fixed the problem.
I unfortunately, can't tell you what changed as a result of the update, nor can I tell you how you can force Android Studio to update or reinstall the android gradle plugin. All I can tell you is that I got lucky that android studio gave me that notification to update the android gradle plugin. Things like "file/project structure" and changing the Android Gradle Plugin Version, didn't fix the problem. What I did notice, was that when I first looked at that, the drop-down list of android gradle versions was an empty list. I manually put one in "3.6.3", but it didn't help. If you run into this problems I would suggest you look at the dates of the two file in the "wrapper" directory and compare those to projects you may have that are working correctly with the android view. I wish I would have checked the date of the wrapper jar file, when it wasn't working. That's what I think might have been wrong (i.e. I got a wrapper.jar file that was incompatible with my version of android studio - unfortunately I can't prove that)

problem solve i have click this button

Being told project is not using the gradle build system when it is

When I open my project in Android Studio, I always get this.
Back when Android Studio first came out, I went through this process so the project should have the Gradle build system. There is a build.gradle file in the root of the project.
I can still build and run the project, but I don't understand why it always says this since the project should use gradle build system. Any help with this would be great.

The android studio support two "build mode". one is "legacy" and one is "gradle based". If you are using an very early version of android studio, probably you are still using the legacy build mode. You need to re-import your project using "gradle mode" then this warning will be gone.
To do so, select "file/import project", select your project root directory, and in the next dialog choose "Import project from external model" and select gradle. Then, you may choose "gradle wrapper" or use your own gradle distribution (1.8 for now[12/2013]).

This link can help, https://developer.android.com/studio/intro/migrate.html
Import as a Project:
Start Android Studio and close any open Android Studio projects.
From the Android Studio menu click File > New > Import Project.
Alternatively, from the Welcome screen, click Import project (Eclipse ADT, Gradle, etc.).
Select the Eclipse ADT project folder with the AndroidManifest.xml file and click Ok.

i know this is an old question but is still valid with newer versions of AS.
If you try to import and import againa and still have the same issue, check if there's a gradle.build file on the root directory, if there's not just create one.
In my case I had to migrate an old project to the new version because with the 0.4.4+ version it stopped recognizing it, and it kept failing, and that was the problem.
Curious thing is the top level build.gradle file just contains this comment:
// Top-level build file where you can add configuration options common to all sub-projects/modules.

I fixed this issue with the following steps:
Make sure that the following two files are in your project directory. If not, create a new one with reference of your other Android projects. These are default auto-generated files.
settings.gradle
build.gradle
If it is still showing any errors when you open your project, restart your project by selecting file/(invalidate /restart).

import Project
File --> New -->import Project

In my case the the problem was that studio version I am using does not support the gradle version of file, so in build.gradle I had to change the gradle version to 2.3.0 and everything is smooth now

Android Studio Marks syntax as error, but gradle compiles

I have a project in Android Studio which compiles with Gradle.
The general file structure is
MyProject
- MyProjectSource
- Libraries
- ActionBarSherlock
My project is built with Gradle and will compile without issue. However in the lines within my activity where I include a component from ActionBarSherlock, Android Studio marks it as an error.
I have noticed that Android Studio has also generated .iml files. So my question: Does Android Studio ignore the gradle build when assessing whether something is valid syntax or not?
Obviously this is not a project blocking problem but it does slow velocity not being able to take advantage of the full set of tools Android Studio has to offer.
Thanks in advance for any help.

These are not errors actually, this a bug in Android studio( 0.4.2 ) for resolving the symbol and fixed for the next release( 0.4.3 ).
To get Rid of these until the release do the following
Clean your project using Build > Clean Project
Close your Android Studio
Take Backup of your project
Delete all .iml files inside your project
Delete content of .idea directory
Open Studio and wait until it completes the sync with gradle
Also verify if you are seeing any error in File > Project Structure . If there is any error saying "Dependency Not Added "click on that and using red bulb on right side Add them to dependency.
UPDATE
Android Studio 0.4.3 is available on Canary Channel Now.

UPDATE: #laochiv, I have found that cleaning manually the folder .idea/libraries and clicking afterward on "Sync Project with Gradle Files" solves the problem. Apparently this Sync does not remove elements, but keep the old ones and add the current ones. Probably a bug to report :)
I am having the same problem. However, I am using ABS directly from Maven.
dependencies {
compile 'com.actionbarsherlock:actionbarsherlock:4.4.0#aar'
compile 'com.android.support:support-v4:18.0.+'
}
Even the ABS Gradle Sample application marks a syntax error, although it compiles.
However, in another computer everything is working perfectly. I can not think of different conditions in each scenario.

"Does Android Studio ignore the gradle build when assessing whether something is valid syntax or not?" Yes. Android Studio imports the project configuration but runs its own compiler as you are editing and saving (you can even change it to the Eclipse ECJ compiler). The true authority on the build is Gradle, and AS is still in beta. You can try to run the gradle resync or close and reimport the project. I have had to manipulate AS like this many times, especially after making edits to build.gradle.
Edit: I have found it better to use ActionBarSherlock as a gradle dependency rather than a library directory.
compile 'com.actionbarsherlock:actionbarsherlock:4.4.0#aar'
You will need to use the SDK manager and install the local maven repository.
But it is possible to eventually get rid of these compile errors, as long as your build.gradle doesn't create any extra sourceSets that AS doesn't understand; try not to deviate too much from the android gradle plugin examples.
Also, I've been running the Canary updates of AS for the latest and greatest.

I don't know how to add a library using MavenCentral. I follow these steps to include a library
Add library in App_Name/App_Name/libs folder.
In App_Name/build.gradle add this
dependencies {
compile ---
compile files('libs/fileName.jar') }
./gradlew clean
Make sure your Android studio is updated.

Go through the link and it worked for me.
1.) Choose File option from menu on left top side of android studio.
2.) Select the option : "Invalidate Cache/ Restart.." It will open an dialog.
3.) Click on the first button with option : "Invalidate and Restart"
4.) It will close the studio and restart it. Start indexing of the project.
It resolved my problem
Go to File -> Invalidate Cache/ Restart -> Invalidate and Restart
Source
https://www.youtube.com/watch?v=FX_gCTpqhwM

I had this problem in Android Studio 4.2, it might be fixed on 4.3
I have noticed that adding some dependencies did not attach the classes.jar to the dependency, so Gradle recognises everything but the IDE doesn't. To fix it:
Open Module Settings of your project
Select the dependency that has the error
Click Add (+) for that dependency (bottom of the pop up)
Navigate to your-project/build/exploded-bundles/your-dependency/classes.jar
The IDE should recognise the files now
Hope it helps

I had this today and gradle update/sync didn't solve. But updating to latest version of Android Studio 2.2 update 5 fixed (was on 2.1).

Here i'm talking about android studio version v3.1.2 where this same issue happened.In later android studio version(above 3.0.1) this issue again rises. So, I solved this by going through few things and here is how
Close android studio first
Navigate to your Project Folder
Delete .gradle and .idea folder (.gradle and .idea is hidden files. so make sure you tick Show Hidden Files in your File Explorer option to see these files
Open your project in android studio now
This Time another issue (unsupported module) will arise, but don't worry. I got you
Goto File in android studio and hit Sync Project with Gradle Files
Tada..! you're done now!

Simplest Solution
Comment/Remove the dependency which is showing syntax error & Sync Project.
Uncomment/Add again & Sync Project.
Yeah! error gone...
Before
After

Android Studio "Project Structure" not coming properly

I follow all the necessary steps for Android Studio installation. I also checked this question, but still facing the same issue.
But whenever I create any new project, following screen come. I couldn't found any project structure as I can see in Eclipse.
Here, I can't find any "src","res" or any file structure. Any idea, how to get proper Project Structure?
when I tried to add "New Module" following error comes to submit.
No message
java.lang.IllegalStateException:
at com.android.tools.idea.wizard.NewModuleWizard.onFailure(NewModuleWizard.java:159)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$3.execute(ExternalSystemUtil.java:340)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$4$1.run(ExternalSystemUtil.java:364)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$TaskRunnable.run(ProgressManagerImpl.java:493)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$6.run(ProgressManagerImpl.java:304)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:185)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:226)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:175)
at com.intellij.openapi.application.impl.ApplicationImpl$10$1.run(ApplicationImpl.java:695)
at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:458)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:154)
When I go to Edit Configuration, can't create any module due to above error.

Go to File > Project Structure > Project Settings > Modules.
Click on the green colored + and add new module.
select Application module and set the content root to your project module.
Click next and then finish.
This should do the trick and the complete project structure will appear.
It worked for me.

Change the SDK to a level that you have installed in the SDK manager. The SDK manager can be accessed from Tools -> Android -> SDK Manager. For me, Android Studio was packaged with API Level 17 but the new project wizard tried to target API Level 18.

When something like that happens to me, to fix it, I go to
File -> Project Structure -> Modules, click (+) to add a module.
To import the main module you have to search for the IML extension file to load the project structure configuration again (for example app.iml), and thats all. I hope it helps.

Kip2's solution worked for me with a slight variation:
1.) File -> Invalidate Cached/Restart..
once android studio restarts:
2.) File -> Sync Project with Gradle Files
Just doing "File -> Sync Project with Gradle Files" (or doing "File -> Sync with File System"), did not correct the problem. I had to invalid the cache first, and then sync the project with gradle files for the project to display properly.

Finally find solution.
Whenever Android Studio starts, it search for "Gradle" installation. If not found, it will download new version of it and cache it here.
C:\Documents and Settings\user\.gradle\wrapper\dists\gradle-1.6-bin\72srdo3a5eb3bic159kar72vok
Here 72srdo3a5eb3bic159kar72vok directory name may be different.
What you need to do is, download gradle-1.6-bin.zip, place it in above directory. Then decompress it there. But make sure your path should like below.
C:\Documents and Settings\crathod.SOLUSOFTINDIA\.gradle\wrapper\dists\gradle-1.6-bin\72srdo3a5eb3bic159kar72vok\gradle-1.6\bin
Now, when you restart your Android Studio, Gradle will be initialized and Project will opened in Full Project Structure.

Modules or the project structure could also not appear because you're in a branch where *.iml files are missing. This happened for me when I was migrating from Eclipse and had decided to check back into the original branch that had the Eclipse-like project structure. What solved my problem:
Checkout the branch with Android Studio-like project structure
File -> Invalidate Cache & Restart

Also, make sure that the root iml file matches case with your root folder. Incorrectly named iml file will cause such problems.
Just delete the root iml file (you can backup if you like), close the project and re-open it. Android Studio will generate the correct iml file and the project structure will be restored.
This is tested on Android Studio 2.1

Before:
　　
After:
　　
　　I got the java folder (src folder) and others.
Solution:
　　
File > Sync Project with Gradle Files
Android Studio Version: 3.2.1
Note: This case did not appear on the old version. For example, 1.5.1 (2016/03 before)
Keywords:
file explorer
file structure
file hierarchy
file system
folder & file list
project explorer
project structure
project hierarchy
disappear / gone / did not see
Android Studio bug / issue

simple way to restore
Delete the project hidden .idea file and .gradle file and restart your project this will fix your issue.

I deleted the app from the list of apps when you open Android Studio, then I reimported the project.

For Android Studio 2.2, you can simply click the left bottom and then select Project

In Android Studio 2.3.1, you don't have the Application module option if you wanted to add a module. The best solution is to right click your project and select "Jump to the source" from the menu. That solved my issue.