大数据 Android Studio 报错：Could not get unknown property ‘kotlin

导入项目，sync 的时候报错：

A problem occurred evaluating project ':app'.

> Could not get unknown property 'kotlin_version' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

出现这个问题，我的思路一般是：新建一个空项目，然后对比两个项目的配置文件。

我的问题是原来的app下build.gradle的dependencies 格式不对，

dependencies {

implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

implementation 'androidx.core:core-ktx:1.0.1'

implementation 'androidx.appcompat:appcompat:1.2.0'

implementation 'com.google.android.material:material:1.0.0'

implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

//testImplementation 'junit:junit:4.+'

//androidTestImplementation 'androidx.test.ext:junit:1.1.2'

//androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

改为如下就好了，

dependencies {

implementation 'androidx.core:core-ktx:1.7.0'

implementation 'androidx.appcompat:appcompat:1.3.0'

implementation 'com.google.android.material:material:1.4.0'

implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

testImplementation 'junit:junit:4.13.2'

androidTestImplementation 'androidx.test.ext:junit:1.1.3'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

}

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