Android Studio and android.support.v4.app.Fragment: cannot resolve symbol

Solution 1:

DID NOT WORK:

I have already had the following dependency in my build.gradle

implementation 'com.android.support:support-v13:26.0.2'

I have tried all of the following,

• Invalidate Caches/Restart
• Sync project with gradle files
• Clean project
• Rebuild project
• gradlew clean

But, none of them worked for me.

SOLUTION:

Finally, I solved it by deleting "/.idea/libraries", and then synced with gradle and built again.

Solution 2:

The symptom of this problem is usually that the build works fine from the command line (which means your build.gradle file is set up right) but you get syntax highlighting errors in the IDE. Follow This Steps To Solve The Problem: Click on Tools from the toolbar usually at the top part of your IDE, and then navigate to Android then navigate to Sync Project with Gradle Files button. We realize it's less than ideal that the IDE can't just take care of itself instead of forcing you to manually sync at the right time; we're tracking progress on this in https://code.google.com/p/android/issues/detail?id=63151

Solution 3:

Try this may will help you.Go to "File" -> "Invalidate Caches...", and select "Invalidate and Restart" option to fix this.

Solution 4:

replace this line of code

import android.support.v4.app.FragmentActivity;

with

import androidx.fragment.app.FragmentActivity;

and you are done.

Solution 5:

I got the same problem since I updated to latest version of Android Studio 0.3.7. So you can try with my stuffs.

Ensure you have updated to latest version Android Support Repository - 3 Android Support Library - 19

As your attachment picture above, you did it already. Then adding the following setting to your build.gradle

dependencies {
    compile 'com.android.support:support-v4:19.0.0'
}

One more thing: Please make sure your Android SDK is targeting to right SDK folder