using UnityEngine;
using UnityEngine.UI;
 
public class Test : MonoBehaviour
{
  public Button btn;
  AndroidJavaObject jo;
  private void Awake()
  {
    AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    jo = jc.GetStatic<AndroidJavaObject>("currentActivity");
    btn.onClick.AddListener(CallAndroid);
  }
  public void CallAndroid()
  {
    jo.Call("ShowToast");//調(diào)用Android中函數(shù)
    Debug.Log("點(diǎn)擊按鈕");
    System.Console.WriteLine("點(diǎn)擊按鈕");
  }
 
  void fromAndroid(string str)
  {
    Debug.Log("安卓傳來信息 : " + str);
    System.Console.WriteLine("安卓傳來信息 : " + str);
  }
}

include ':unityLibrary'
project(':unityLibrary').projectDir = new File('..\\UnityProject\\androidBuild\\unityLibrary')

 implementation project(':unityLibrary')
  implementation fileTree(dir: project(':unityLibrary').getProjectDir().toString() + ('\\libs'), include: ['*.jar'])

ndk {
      // 設(shè)置支持的SO庫架構(gòu)，第三方給的so庫哪幾種架構(gòu)，就配置這幾種架構(gòu)
      abiFilters 'armeabi', 'armeabi', 'x86', 'armeabi-v7a', 'x86_64', 'arm64-v8a'
    }

allprojects {
  repositories {
    google()
    jcenter()
 
    // Add Code
    flatDir {
      dirs "${project(':unityLibrary').projectDir}/libs"
    }
    // End
  }
}

 <string name="game_view_content_description">Game view</string>

package com.Wish.UnityProject;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_unity);
    Button btn=(Button) findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(MainActivity.this, UnityActivity.class);
        startActivity(intent);
      }
    });
  }
}

package com.Wish.UnityProject;
 
import android.content.Intent;
import android.os.Bundle;
 
import com.unity3d.player.UnityPlayer;
import com.unity3d.player.UnityPlayerActivity;
 
public class UnityActivity extends UnityPlayerActivity {
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    testSendMessage();
  }
  // 向unity發(fā)送信息
  public void testSendMessage()
  {
    //第一個(gè)參數(shù)是Unity中一個(gè)節(jié)點(diǎn)對(duì)象的名字，第二個(gè)參數(shù)是節(jié)點(diǎn)對(duì)象上掛的腳本中一個(gè)函數(shù)的名字，第三個(gè)參數(shù)是函數(shù)中的參數(shù)值
    UnityPlayer.UnitySendMessage("unityObject", "fromAndroid", "test");
  }
  // 接收unity信息
  public void ShowToast()
  {
    // unity點(diǎn)擊按鈕跳轉(zhuǎn)回安卓界面
    Intent intent = new Intent(this, MainActivity.class);
    this.startActivity(intent);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.Wish.UnityProject">
 
  <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
      android:name="com.Wish.UnityProject.MainActivity">
      <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>
    <activity android:name="com.Wish.UnityProject.UnityActivity">
 
    </activity>
 
  </application>
 
</manifest>

<action android:name="android.intent.action.MAIN" />
 
 <category android:name="android.intent.category.LAUNCHER" />