package com.example.hsh.testun;import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;import com.unity3d.player.UnityPlayerActivity;public class MainActivity extends UnityPlayerActivity {Context m_context;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//setContentView(R.layout.activity_main);m_context = this;}public String ShowDialog(final String _title, final String _content){return "Java return";}public void dialog2(){Log.d("dialog2","ffffffffffff");}public void dialog1(){AlertDialog.Builder mBuilder=new AlertDialog.Builder(m_context);mBuilder.setTitle("testtttt").setMessage("xxxxxxxxxxxxxxxxx").setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// Whatever...
                    }});AlertDialog dialog=mBuilder.create();dialog.show();}
}

<?xml version="1.0" encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"package="com.example.hsh.testun"xmlns:tools="http://schemas.android.com/tools"android:installLocation="preferExternal"android:versionCode="1"android:versionName="1.0"><supports-screensandroid:smallScreens="true"android:normalScreens="true"android:largeScreens="true"android:xlargeScreens="true"android:anyDensity="true"/><uses-permission android:name="android.permission.INTERNET"/><applicationandroid:theme="@style/UnityThemeSelector"android:icon="@drawable/app_icon"android:label="@string/app_name"android:debuggable="true"><activity android:name=".MainActivity"android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter><meta-data android:name="unityplayer.UnityActivity" android:value="true" /></activity></application>
</manifest>

using UnityEngine;
using System.Collections;
using UnityEngine.UI;public class TestBtnScript: MonoBehaviour {// Use this for initializationvoid Start () {}// Update is called once per framevoid Update () {}public void MyShowDialog(){// Android的Java接口    AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");//AndroidJavaClass jc = new AndroidJavaClass("com.example.hsh.testun.MainActivity");//AndroidJavaObject jo = new AndroidJavaObject("com.example.hsh.testun.MainActivity");// 参数    string[] mObject = new string[2];mObject[0] = "Dialog title";mObject[1] = "Dialog text is here!!";
try{jo.Call("dialog1");string ret = jo.Call<string>("ShowDialog", mObject);Text text4 = GameObject.Find("Canvas/Text").GetComponent<Text>();text4.text = ret;}catch(System.Exception e){Text text2 = GameObject.Find("Canvas/Text").GetComponent<Text>();text2.text = e.ToString();}// 调用方法     }
}