Unity Android iOS 交互（不用UnitySendMessage）

以实现弹窗为例。

C#代码

using UnityEngine;
using System.Runtime.InteropServices;
using System;

public class AlertView
{
    public delegate void AlertViewDelegate(int buttonIndex);

#if UNITY_IOS
    private static AlertViewDelegate alertViewDelegate;

    [AOT.MonoPInvokeCallback(typeof(AlertViewDelegate))]
    static void AlertViewCallback(int buttonIndex)
    {
        Debug.Log("AlertViewCallback " + buttonIndex);

        if (alertViewDelegate != null)
            alertViewDelegate(buttonIndex);
    }

    [DllImport("__Internal")]
    private static extern void _showAlert(string title, string message, string okButton, string cancelButton, AlertViewDelegate callback);

#elif UNITY_ANDROID
    class OnClickListener : AndroidJavaProxy
    {
        AlertViewDelegate alertViewDelegate = null;

        public OnClickListener(AlertViewDelegate alertViewDelegate) : base("com.sinyee.babybus.plugins.PluginAlertDialog$OnClickListener")
        {
            this.alertViewDelegate = alertViewDelegate;
        }

        public void onClick(int buttonIndex)
        {
            alertViewDelegate(buttonIndex);
        }
    }

    //static AndroidJavaObject activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic("currentActivity");

    //static void Run(Action action)
    //{
    //    activity.Call("runOnUiThread", new AndroidJavaRunnable(action));
    //}
#endif

    public static void ShowAlert(string title, string message, string okButton, string cancelButton, AlertViewDelegate callback = null)
    {
#if UNITY_IOS
        alertViewDelegate = callback;
        _showAlert(title, message, okButton, cancelButton, AlertViewCallback);
#elif UNITY_ANDROID
        new AndroidJavaClass("com.sinyee.babybus.plugins.PluginAlertDialog").CallStatic("showAlertDialog", title, message, okButton, cancelButton, new OnClickListener(callback));
#endif
    }
}

java代码

package com.sinyee.babybus.plugins;

import android.app.AlertDialog;
import android.content.DialogInterface;

import com.unity3d.player.UnityPlayer;

/**
 * Created by Lin on 2016/11/22.
 */

public class PluginAlertDialog
{
    public interface OnClickListener {
        void onClick(int buttonIndex);
    }

    public static void showAlertDialog(final String title, final String message, final CharSequence yesString, final CharSequence noString, final OnClickListener onClickListener) {
        UnityPlayer.currentActivity.runOnUiThread(new Runnable() {
            public void run() {
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(UnityPlayer.currentActivity)
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setTitle(title)
                        .setMessage(message)
                        .setPositiveButton(yesString, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                if (onClickListener != null)
                                    onClickListener.onClick(which);
                            }
                        });

                if (noString != null && !noString.equals("")) {
                    alertDialogBuilder.setNegativeButton(noString, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            if (onClickListener != null)
                                onClickListener.onClick(which);
                        }
                    });
                }

                alertDialogBuilder.show();
            }
        });
    }
}

oc代码

//
//  BBAlertView.h
//  Unity-iPhone
//
//  Created by Lin on 16/11/22.
//
//

#import 

@interface BBAlertView : NSObject

- (void)showAlert:(const char *)title message:(const char*)message okButtonTitle:(const char*)okButton cancelButtonTitle:(const char*)cancelButton;

@end

//
//  BBAlertView.m
//  Unity-iPhone
//
//  Created by Lin on 16/11/22.
//
//

#import "BBAlertView.h"

typedef void (*AlertViewDelegate)(int buttonIndex);

AlertViewDelegate g_alertViewDelegate;

void _showAlert(const char* title, const char* message, const char* okButton, const char* cancelButton, AlertViewDelegate alertViewDelegate)
{
    g_alertViewDelegate = alertViewDelegate;
    
    [[[BBAlertView alloc] init] showAlert:title message:message okButtonTitle:okButton cancelButtonTitle:cancelButton];
}

@implementation BBAlertView

- (void)showAlert:(const char *)title message:(const char*)message okButtonTitle:(const char*)okButton cancelButtonTitle:(const char*)cancelButton{
    
    NSString* cancelButtonTitle = nil;
    if(strcmp(cancelButton, "") != 0)
        cancelButtonTitle = [NSString stringWithUTF8String:cancelButton];
    
    NSString* okButtonTitle = nil;
    if(strcmp(okButton, "") != 0)
        okButtonTitle = [NSString stringWithUTF8String:okButton];
    
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithUTF8String:title]
                                                     message:[NSString stringWithUTF8String:message]
                                                    delegate:self
                                           cancelButtonTitle:cancelButtonTitle
                                           otherButtonTitles:okButtonTitle, nil];
    [alert show];
    [alert release];//ARC模式下不会回调UIAlertViewDelegate中的方法
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    
    if(g_alertViewDelegate != NULL)
        g_alertViewDelegate((int)buttonIndex);
}

@end