java - Kotlin:重载解析歧义

Question

尝试执行以下代码:

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        Test().list.contains(1)
    }
}

public class Test {

    ArrayList<Integer> list;

    public ArrayList<Integer> getList() {
        return list;
    }
}

并且编译在 Test().list.contains(1) 处失败并显示消息:

Task :app:compileDebugKotlin FAILED e: /Users/sreejithcr/Documents/MyApplication/app/src/main/java/com/wxample/myapplication/MainActivity.kt: (13, 31): Overload resolution ambiguity: public open fun contains(@Nullable element: Int!): Boolean defined in java.util.ArrayList public open fun contains(@Nullable element: Int!): Boolean defined in java.util.ArrayList

据我所知，编译器发现 2 个 contains() 具有完全相同的签名，但不确定调用哪一个。

渐变配置:

ext.kotlin_version = '1.3.41'

类路径 'com.android.tools.build:gradle:3.4.2'

Answer 1

这是 Android Studios API 29 R2 的问题

https://issuetracker.google.com/issues/139041608#comment3

转到工具 -> SDK 管理器 -> 卸载 Android 9.+，然后在 Google 回滚 R2 时再次安装它，这样你就会回到 R1