'Run Button Grayed out: Android Studio

Why is the run button always grayed out in android studio after I get some errors. I need to restart/reboot my android studio every time to run it again. I am sure that I am missing something

Run bar:

Run Button:

I also get an error right now :)

Already disposed: Project (Disposed): Already disposed: Project (Disposed)
java.lang.AssertionError: Already disposed: Project (Disposed)
    at com.intellij.openapi.components.impl.ComponentManagerImpl.getComponent(ComponentManagerImpl.java:186)
    at com.intellij.psi.PsiDocumentManager.getInstance(PsiDocumentManager.java:41)
    at com.intellij.psi.SingleRootFileViewProvider.getLastCommittedText(SingleRootFileViewProvider.java:521)
    at com.intellij.psi.SingleRootFileViewProvider.access$400(SingleRootFileViewProvider.java:63)
    at com.intellij.psi.SingleRootFileViewProvider$DocumentContent.getText(SingleRootFileViewProvider.java:537)
    at com.intellij.psi.SingleRootFileViewProvider.getContents(SingleRootFileViewProvider.java:347)
    at com.intellij.psi.impl.source.PsiFileImpl.loadTreeElement(PsiFileImpl.java:199)
    at com.intellij.psi.impl.source.PsiFileImpl.calcTreeElement(PsiFileImpl.java:776)
    at com.intellij.psi.impl.source.PsiFileImpl.getFirstChild(PsiFileImpl.java:787)
    at com.intellij.psi.impl.source.xml.XmlFileImpl.getDocument(XmlFileImpl.java:47)
    at com.intellij.psi.impl.source.xml.XmlFileImpl.getRootTag(XmlFileImpl.java:58)
    at com.android.tools.idea.rendering.LocalResourceRepository.getViewTag(LocalResourceRepository.java:323)
    at org.jetbrains.android.inspections.lint.IntellijViewTypeDetector.getViewTags(IntellijViewTypeDetector.java:42)
    at com.android.tools.lint.checks.ViewTypeDetector.visitMethod(ViewTypeDetector.java:213)
    at com.android.tools.lint.client.api.JavaVisitor$DelegatingJavaVisitor.visitMethodInvocation(JavaVisitor.java:1189)
    at lombok.ast.MethodInvocation.accept(MethodInvocation.java:114)
    at lombok.ast.Cast.accept(Cast.java:94)
    at lombok.ast.BinaryExpression.accept(BinaryExpression.java:131)
    at lombok.ast.ExpressionStatement.accept(ExpressionStatement.java:63)
    at lombok.ast.Block.accept(Block.java:106)
    at lombok.ast.MethodDeclaration.accept(MethodDeclaration.java:240)
    at lombok.ast.NormalTypeBody.accept(NormalTypeBody.java:57)
    at lombok.ast.ClassDeclaration.accept(ClassDeclaration.java:239)
    at lombok.ast.CompilationUnit.accept(CompilationUnit.java:83)
    at com.android.tools.lint.client.api.JavaVisitor.visitFile(JavaVisitor.java:217)
    at com.android.tools.lint.client.api.LintDriver.checkIndividualJavaFiles(LintDriver.java:1652)
    at com.android.tools.lint.client.api.LintDriver.runFileDetectors(LintDriver.java:986)
    at com.android.tools.lint.client.api.LintDriver.checkProject(LintDriver.java:858)
    at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:425)
    at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:369)
    at org.jetbrains.android.inspections.lint.AndroidLintExternalAnnotator.doAnnotate(AndroidLintExternalAnnotator.java:146)
    at org.jetbrains.android.inspections.lint.AndroidLintExternalAnnotator.doAnnotate(AndroidLintExternalAnnotator.java:56)
    at com.intellij.codeInsight.daemon.impl.ExternalToolPass.doAnnotate(ExternalToolPass.java:222)
    at com.intellij.codeInsight.daemon.impl.ExternalToolPass.access$400(ExternalToolPass.java:43)
    at com.intellij.codeInsight.daemon.impl.ExternalToolPass$2.run(ExternalToolPass.java:133)
    at com.intellij.codeInsight.daemon.impl.ExternalToolPass$3.run(ExternalToolPass.java:170)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
    at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
    at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.Alarm$Request$1.run(Alarm.java:327)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at com.intellij.util.concurrency.QueueProcessor$RunnableConsumer.consume(QueueProcessor.java:298)
    at com.intellij.util.concurrency.QueueProcessor$RunnableConsumer.consume(QueueProcessor.java:295)
    at com.intellij.util.concurrency.QueueProcessor$2$1.run(QueueProcessor.java:110)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.concurrency.QueueProcessor$2.consume(QueueProcessor.java:107)
    at com.intellij.util.concurrency.QueueProcessor$2.consume(QueueProcessor.java:104)
    at com.intellij.util.concurrency.QueueProcessor$3$1.run(QueueProcessor.java:215)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.concurrency.QueueProcessor$3.run(QueueProcessor.java:212)
    at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:419)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
    at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:149)

android-studio

Solution 1:^[1]

If you've made major changes to your project structure, it sometimes takes restarting Android Studio to regain the ability to Run your project. Worked for me.

Solution 2:^[2]

You should initially configure the application.

Click the edit configuration in the combo box left to run button then:

Select the app module

enter image description here

Solution 3:^[3]

After an update of Android Studio or major changes to your project structure, you need to restart Android Studio and for the first time press run from the dropdown menu

Solution 4:^[4]

Happened to me when my module settings weren't right. Go to module settings by right clicking the project in the left pane then make sure the target is set to android-23 or whatever version you want

Solution 5:^[5]

After an update of Android studio the week of writing, the issue got resolved

Solution 6:^[6]

If you are not able to launch android app without activity then perform below mention steps.

Open Edit Configuration.
Select your application and check the do not launch activity.

Solution 7:^[7]

In my case, this happened after upgrading the MacOS to Catalina and creating a new user. I had to first reinstall Flutter, get the path and add the path permanently to the environmental variables.

Then I had to go Preferences -> Languages and Frameworks -> Flutter -> add the Flutter SDK (where you installed the latest Flutter) to the Flutter SDK path.

Solution 8:^[8]

I fixed this issue by re-importing my Gradle Project. For me, everything was greyed out(Run/Debug/Build), and re-starting Android Studio was not enough to fix this issue.

I did: File -> Re-Import Gradle Project.

After a while, all the buttons in the Android Studio IDE started functioning normally again.

Solution 9:^[9]

There are many solutions related to this problem.

Go to Setting->Plugins->uncheck the red one's and apply. Then again mark them (check them ) and apply .

Restart your android studio , it will work.

Solution 10:^[10]

For me, it was an issue with the app module which was not selected after Android Studio update. Select the app module in the combo box to the left of the run button.

Solution 11:^[11]

Go to Run > Edit Configuration then go to Defaults > Android app" then in General tab select App in module then "Apply" This is working for me.

Solution 12:^[12]

It is very simple solution for the one like me for whom nothing mentioned above worked. Just follow: Build ? Clean Project

Solution 13:^[13]

Just sync the Gradle.

Done. This worked for me

Solution 14:^[14]

I closed the project, and in the screen listing my recent projects, I removed the project and then went to Open an Existing Android Studio Project -> Open.

This fixed the issue for me.

Solution 15:^[15]

Sometimes it happens without any reason. If there is no problem with Run configuration, restarting Android Studio usually helps.

Solution 16:^[16]

For me, doing a Gradle sync solved that problem :

File
Sync Project with Gradle Files

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2	Sambhav. K
Solution 3	Sambhav. K
Solution 4
Solution 5	Sambhav. K
Solution 6	Sambhav. K
Solution 7	palme
Solution 8	Sambhav. K
Solution 9	Sambhav. K
Solution 10	Sambhav. K
Solution 11	Sambhav. K
Solution 12	Sambhav. K
Solution 13	Sambhav. K
Solution 14	Sambhav. K
Solution 15	Sambhav. K
Solution 16	Ryan M

'Run Button Grayed out: Android Studio

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