于Unity3D调用安卓AlertDialog

例如，下面的示例代码演示

package com.sample.sampletest;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.unity3d.player.UnityPlayerActivity;

public class MainActivity extends UnityPlayerActivity {

	private static Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        handler=new Handler()
        {
        	@Override
        	public void handleMessage(Message msg)
        	{
        		super.handleMessage(msg);
        		switch (msg.what)
        		{
        			case 1: indirectShowDialog(); break;
        			default:break;
        		}
        	}
        };
    }

    public void showExitConfirm()
    {
    	Message tempMsg=new Message();
    	tempMsg.what=1;
    	handler.sendMessage(tempMsg);
    }

    void indirectShowDialog()
    {
    	AlertDialog dialog=new AlertDialog.Builder(this)
    	.setTitle("提示")
    	.setMessage("确定要退出吗")
    	.setPositiveButton("确定", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				System.exit(0);
			}})
		.setNegativeButton("取消", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				dialog.dismiss();
			}
		})
    	.create();
    	dialog.show();
    }
}

不能直接调用。必须通过一个handler间接调用，我没在官网上找到原因，我在一个台湾程序员的博客上看到说是因为unity3d生成的安卓主activity由于安全原因，屏蔽掉AlertDialog，没关系，我们就可以间接调用

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