kotlin - getInstance() Unresolved Kotlin

Question

在调用时显示 getInstance() 未解析的引用。

class GlobalHolder {

    private var pickerManager: PickerManager? = null

    private val ourInstance = GlobalHolder()

    fun getInstance() {
        return ourInstance
    }

    private fun GlobalHolder(){}


    fun getPickerManager(): PickerManager? {
        return pickerManager
    }

    fun setPickerManager(pickerManager: PickerManager) {
        this.pickerManager = pickerManager
    }
}

调用

   lateinit var pickerManager: PickerManager
    pickerManager=GlobalHolder.getInstance().getPickerManager()

仅供引用

这是原始的 Java 类

public class GlobalHolder {

    private PickerManager pickerManager;

    private static GlobalHolder ourInstance = new GlobalHolder();

    public static GlobalHolder getInstance() {
        return ourInstance;
    }

    private GlobalHolder() {
    }


    public PickerManager getPickerManager() {
        return pickerManager;
    }

    public void setPickerManager(PickerManager pickerManager) {
        this.pickerManager = pickerManager;
    }
}

Answer 1

你愿意拥有一个单例，对吧？使 GlobalHolder 成为 object ，它将自动提供一个单例:

object GlobalHolder {

    private var pickerManager: PickerManager? = null

    fun getPickerManager(): PickerManager? {
        return pickerManager
    }

    fun setPickerManager(pickerManager: PickerManager) {
        this.pickerManager = pickerManager
    }
}

然后你的实例是这样的:

GlobalHolder.getPickerManager()