Android studio appcompatactivity ошибка

asked Mar 22, 2015 at 21:09

A little addition to other answers here, for anyone having the same error while using the right lib version and the right class.

When I upgraded to

appcompat-v7:22.1.0

In which ActionBarActivity is deprecated and empty and AppCompatActivty is the way to go, due to some glitch in Android Studio, It didn’t quite pick up on version change.

i.e. Even though Gradle ran without errors, the IDE itself kept saying
Cannot resolve symbol 'AppCompatActivity' (and it also wasn’t available through the Ctrl+N search)

I looked into the .idea/libraries folder and noticed there’s no appropriate metafile for the new version of the lib.

So, using the old-reliable File->Invalidate Caches/Restart did the trick. Always try this when you feel something is magically wrong with Android Studio.
And then Disable offline mode and sync.

If the soft methods via gradle file / «Invalidate caches» and the other IDE tools do not work, use the hard way:

1. Exit Android Studio
2. Navigate in your project to the .idea folder
3. Just Rename the libraries folder
4. Restart Android Studio. It should now recreate the libraries folder and work again.

This worked for me on

Android Studio 3.1.2
Build #AI-173.4720617, built on April 13, 2018
JRE: 1.8.0_152-release-1024-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.13.0-38-generic

Shahbaz Ali confirmed, it works also on

Android Studio 3.1.3
Build #AI-173.4819257, built on June 4, 2018
JRE: 1.8.0_152-release-1024-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.13.0-38-generic

moujib confirmed, it works on Android Studio 3.2.1

answered May 2, 2018 at 7:24

Today (22 April) you can use the new AppCompatActivity released with the support libraries v 22.1.0.

Just change your dependency :

compile "com.android.support:appcompat-v7:22.1.0"

Here you can find more info about this new class.

answered Apr 21, 2015 at 22:40

It is too simple.here are the steps you need to follow

1-Exit Android studio.

2-Go to your project directory.

3-Something like this in my case( F>Android->YourProjectName->.idea).

4)-delete libraries folder present in .idea folder.

5)-restart your android studio.
and your issue is resolved.

I got it fixed by Going to build.gradle file and in dependencies the appcompat one, something like compile 'com.android.support:appcompat-v7:XX.X.X'

Changed it to compile 'com.android.support:appcompat-v7:XX.X.+'

Then click on Sync. All the red squiggly lines should go if everything else in your code is correct.

answered Apr 6, 2017 at 19:28

answered Aug 8, 2015 at 11:15

Cannot resolve symbol AppCompatActivity Issue.

Do the Simple Step to resolve the problem.

i) Exit the Android studio.

ii) Go to your project directory.

iii) Find the .idea folder in your project directory.

iv) Delete .idea folder.

v) Restart your android studio.

vi) The Issue Will be resolved.

answered Oct 16, 2018 at 7:31

When you add AndroidX support in Gradle.properties file e.g.

android.useAndroidX=true
android.enableJetifier=true

If you are using Gradle version greater than 3.2, the conventional Appcompat dependancy e.g.

implementation 'com.android.support:appcompat-v7:27.1.1

wont work.
Replace this dependancy with:

implementation 'androidx.appcompat:appcompat:1.1.0'

Moreover, change the AppCompatActivity import in your class file from this:

import android.support.v7.app.AppCompatActivity;

to this:

import androidx.appcompat.app.AppCompatActivity;

Done

answered Apr 29, 2020 at 18:00

I got the Cannot resolve symbol error for AppCompatActivity and many other classes & methods after updating Android Studio from 2.2.3 to 2.3, updating Android Gradle plugin to 2.3.0, and updating Gradle to 3.3.

File -> Invalidate Caches / Restart did not resolve the issue.

Preferences -> Build, Execution, Deployment -> Gradle showed Use local gradle distribution selected with Gradle home: /Applications/Android Studio.app/Contents/gradle/gradle-2.14.1 and a warning displayed saying the gradle location was incorrect.

Resolved issue by selecting Use default gradle wrapper (recommended).
Probably just pointing to the new local distribution location would also work.

answered Mar 2, 2017 at 23:53

Try this. In Android Studio, after putting the dependency in build.gradle.
Go to Build —> Clean Project.

It worked for me.

answered Sep 23, 2015 at 21:05

answered Sep 10, 2018 at 7:43

Nihas NizarNihas Nizar

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So my collegue pushed their local.properties which broke everything. I copied my sdk path from another app and did:

File -> Sync Project with Gradle Files

answered Mar 18, 2018 at 1:38

ZainZain

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SuragchSuragch

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Lets get going step by step: first clean project by using

Build->Clean

if this doesn’t helps then use your second step

File>Invalidate Caches/Restart…

But the real problem begins when all the above options doesn’t works so use your ultimate solution is to close project and go to project location directory and delete

.idea

You can open your project now again.

answered Nov 2, 2018 at 11:55

CiskeCiske

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Add this dependency in project build .gradle.

Follow the example below.

dependencies {

    compile 'com.android.support:appcompat-v7:22.1.0'
}

answered Nov 22, 2018 at 11:43

I solved it adding:

import androidx.appcompat.app.AppCompatActivity;

in the «import» zone of the main .java file. It worked for me.

Hope it helps!

Nadeem BhatNadeem Bhat

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