android - MainActivity.java中的NonNull问题

Question

我的项目在调试状态下正常工作。当我打开MainActivity.java文件时，这在import androidx.annotation.NonNull;上显示了问题

并在下面显示错误。

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Users\Abdullah Al Mamun\AndroidStudioProjects\product_sale\android\build.gradle' line: 32

* What went wrong:
A problem occurred evaluating root project 'android'.
> Could not find method implementation() for arguments [com.android.support:support-annotations:28.0.0] 
on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

在MainActivity.java文件中，我无法解决问题



问题在这里



以下的 build.gradle

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
    }
}

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

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

dependencies {
    implementation 'com.android.support:support-annotations:28.0.0'

}

Answer 1

我认为您需要迁移到Android X，请检查here。