unity写android插件时的回调接口处理AndroidJa

Description

This class can be used to implement any java interface. Any java vm method invocation matching the interface on the proxy object will automatically be passed to the c# implementation.
// Opens an android date picker dialog and grabs the result using a callback.

using UnityEngine;
using System;

class ExampleClass : [MonoBehaviour](https://docs.unity3d.com/ScriptReference/MonoBehaviour.html)
{
    private static DateTime selectedDate = DateTime.Now;

    class DateCallback : [AndroidJavaProxy](https://docs.unity3d.com/ScriptReference/AndroidJavaProxy.html)
    {
        public DateCallback() : base("android.app.DatePickerDialog$OnDateSetListener") {}
        void onDateSet([AndroidJavaObject](https://docs.unity3d.com/ScriptReference/AndroidJavaObject.html) view, int year, int monthOfYear, int dayOfMonth)
        {
            selectedDate = new DateTime(year, monthOfYear + 1, dayOfMonth);
        }
    }

    void OnGUI()
    {
        if ([GUI.Button](https://docs.unity3d.com/ScriptReference/GUI.Button.html)(new [Rect](https://docs.unity3d.com/ScriptReference/Rect.html)(15, 15, 450, 75), string.Format("{0:yyyy-MM-dd}", selectedDate)))
        {
            [AndroidJavaClass](https://docs.unity3d.com/ScriptReference/AndroidJavaClass.html) activity = new [AndroidJavaClass](https://docs.unity3d.com/ScriptReference/AndroidJavaClass.html)("com.unity3d.player.UnityPlayer").GetStatic<[AndroidJavaClass](https://docs.unity3d.com/ScriptReference/AndroidJavaClass.html)>("currentActivity");
            activity.Call("runOnUiThread", new [AndroidJavaRunnable](https://docs.unity3d.com/ScriptReference/AndroidJavaRunnable.html)(() =>
            {
                new [AndroidJavaObject](https://docs.unity3d.com/ScriptReference/AndroidJavaObject.html)("android.app.DatePickerDialog", activity, new DateCallback(), selectedDate.Year, selectedDate.Month - 1, selectedDate.Day).Call("show");
            }));
        }
    }
}</pre>

怎么将日期选择返回到一个text呢

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class GetTimeClass
{
    private static DateTime curDate = DateTime.Now;


    public delegate void TimeSelected(string time);
    static  TimeSelected callback;
    class DateCallback : AndroidJavaProxy
    {
        public DateCallback() : base("android.app.DatePickerDialog$OnDateSetListener"){}
        void onDateSet(AndroidJavaObject view, int year, int monthOfYear, int dayOfMonth)
        {
            //curDate = new DateTime(year, monthOfYear + 1, dayOfMonth);

            callback(year+"/"+(monthOfYear + 1) +"/"+ dayOfMonth);
            callback = null;
        }
    }
 
    public static void GetTime(TimeSelected cb)
    {
        callback = cb;
        AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");

        activity.Call("runOnUiThread", new AndroidJavaRunnable(() =>
        {
            new AndroidJavaObject("android.app.DatePickerDialog", activity, new DateCallback(), curDate.Year, curDate.Month - 1, curDate.Day).Call("show");
        }));
       
    }
   
}

调用

    GetTimeClass.GetTime((time) => {

            title.text = time;
        });