unity和android的项目交互

import android.os.Bundle;
import android.widget.Toast;

import com.unity3d.player.UnityPlayerActivity;

public class MainActivity extends UnityPlayerActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    // 显示Toast消息
    public void ShowToast(final String message){
        runOnUiThread(new Runnable() {  
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
            }
        });
    }

    // 返回一个字符串（静态方法）
    public static String GetInformation()
    {
        return "This is a Plugin's content!";
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cby.unitydemo">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:theme="@android:style/Theme.NoTitleBar">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <!--添加unity的配置-->
            <meta-data
                android:name="unityplayer.UnityActivity"
                android:value="true" />
        </activity>
    </application>

</manifest>

apply plugin: 'com.android.library'

android {
    compileSdkVersion 25
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

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

public class Call : MonoBehaviour {

    // Use this for initialization
    private Transform canvasForm;
    private Button testButton;
    private Button showButton;
    private Text ResultText;

    void Start () {
        canvasForm = GameObject.Find("Canvas").transform;
        //获取控件对象设置时间监听
        testButton = canvasForm.Find("TestButton").GetComponent<Button>();  
        showButton = canvasForm.Find("ShowButton").GetComponent<Button>();
        ResultText = canvasForm.Find("ResultText").GetComponent<Text>();
        testButton.onClick.AddListener(BtnShwMessage);
        showButton.onClick.AddListener(showClick);
        ResultText.text = "hello";
    }

    public void showClick()
    {
        Debug.Log("showClick click");
        print("执行了showClick方法!");
        ResultText.text = "show the click event";
    }

    public void BtnShwMessage()
    {
            
        AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");

        AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");

        //调用成员方法
        jo.Call("ShowToast", "Unity 调用了这个方法");

        //调用静态方法
        ResultText.text = jo.CallStatic<string>("GetInformation");
    }

    // Update is called once per frame
    void Update () {
        
    }

}

 AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
 AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");