can't resolve AppCompatActivity

Question

After renaming application package name, Android Studio displayed this error can\'t resolve symbol AppCompatActivity

Things I tried: <

Answer 1

i have this problem while using the android studio on ubuntu 16.04 go to File>invalid cache/Restore>Invalidate and Restart that works fine for me

Answer 2

Okay, to anybody who might stumble upon this now, Android Studio is very, very, very weird.

Solution : Go to your build.gradle file and in your dependencies find the appcompat one, something like compile 'com.android.support:appcompat-v7:XX.X.X'

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

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

Then go back to your build.gradle and change it back to whatever it was and click Sync Now

It should all be fine given that you have the latest version of everything or close to it.

Answer 3

I was stuck with this problem and its take me whole day to solve this.Finally i solved this with the following steps

1. Close your android studio
2. Go to you project folder and look for .idea folder
3. Find libraries folder and rename it
4. Then start your Android studio and open that project again.

Thats it.

Answer 4

I was having this exact same issue just a couple minutes ago and fixed it by doing a Build > Rebuild Project.

Hope it helps.

Answer 5

With the new Release of android studio 3.1.3, you must put this code inside build.gradle.

implementation 'com.android.support:design:23.4.0'

Answer 6

I had the same issue and the following worked for me

File -> Invalidate cache/Restart

There is some kind of caching issue that is happening. If such kind of issue appears try this since most of the time it will work :D