Cannot resolve symbol v7 in importing appcompatactivity

Question

I'm new to Android Studio and it was working just fine and I made few apps and they worked pretty well, and then I downloaded a project from GitHub and tried to import it, the project didn't work but now every time I make new project this error happens:(I can't upload pictures)

Import android.support.v7.app.AppCompatActivity; The 'v7' is colored in red and it says it can't resolve symbol v7

In the messages it giving me this:

Unable to resolve dependency for ':app@debug/compileClasspath': could not resolve com.android.support:appcompat-v7:26.0.0-beta1)

I tried the following:

invalidate caches and restart
compile 'com.android.support:appcompat-v7:26.0.0' in the dependencies in the build.gradle
clean project and sync project with Gradle files

But nothing worked.

I have Android studio 3.0.1
Android emulator 27.1.12
Android SDK platform tools 27.0.1
Android SDK tools 26.1.1

try this : https://stackoverflow.com/questions/46949622/android-studio-3-0-unable-to-resolve-dependency-for-appdexoptions-compileclas — Itoun, Apr 17 '18 at 09:07
If you try with support library version 25, is it working? If not, try removing `.gradle` in your project. Are you using Android Studio 3.1.1? — ישו אוהב אותך, Apr 17 '18 at 12:29
It didn't work , everything was working just fine but after I imported this project from GitHub this error occurred — Basel Qarabash, Apr 17 '18 at 12:30
Sorry I'm new to android studio , how can I try support library version 25? — Basel Qarabash, Apr 17 '18 at 12:34
There's a message in "Gradle bulid" tab : > no cached version of com.android.support .appcompat-v7:26.0.0-beta1 available for offline mode — Basel Qarabash, Apr 17 '18 at 12:40
I solved by changing the implementation from 26.0.0-beta1 to 26.1.0 and com.android.support.test:runner:0.5 to 1.0.1 and com.android.support.test.espresso:espresso-core:2.2.2 to 3.0.1 but do I need to do this to every new project? — Basel Qarabash, Apr 17 '18 at 12:52
This probably a bug. You should try update your Android Studio to version 3.1.1. It's pretty stable. — ישו אוהב אותך, Apr 17 '18 at 13:40

score 2 · Answer 1 · answered Apr 17 '18 at 14:00

To use support libraries starting from version 26.0.0 you need to add Google's Maven repository to your project's build.gradle file as described here: https://developer.android.com/topic/libraries/support-library/setup.html

allprojects {
        repositories {
            jcenter()
            maven {
                url "https://maven.google.com"
            }
        }
    }

For Android Studio 3.0.0 and above:

allprojects {
        repositories {
            jcenter()
            google()
        }
    }

Cannot resolve symbol v7 in importing appcompatactivity

1 Answers1