一.服务端

1.创建aidl文件，然后记得build下生成java文件

package com.example.aidlservice31;

// Declare any non-default types here with import statements

interface IMyAidlServer {
      // 接收一个字符串参数
      void setData(String value);
      // 返回一个字符串
      String getData();
}

2.创建远程MyService.class

class MyService : Service() {

    private val mBinder by lazy { MyBinder() }

    override fun onBind(intent: Intent): IBinder {
        return mBinder
    }

    inner class MyBinder : IMyAidlServer.Stub() {

        private var mData: String = "李小龙"

        override fun setData(value: String) {
            Log.e("yjj", "客户端发来的数据== $value")
            mData = value
        }

        override fun getData() = mData+"返回的数据"
    }
}

3.在AndroidManifest配置MyService

        <service
            android:name=".MyService"
            //远程可访问
            android:exported="true"
            //开启远端进程
            android:process=":remote">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT" />
                //客户端通过action绑定MyService
                <action android:name="com.example.aidlservice31.MyService" />
            </intent-filter>
        </service>

二、客户端

1.复制服务端aidl文件夹，啥也别改，然后build下，自动生成java文件。

2.绑定服务，传输数据

class MainActivity : AppCompatActivity() {

    private var mServer: IMyAidlServer? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        initView()
    }

    private var mNumber = 0

    private fun initView() {
        val tvGetDataValue: TextView = findViewById(R.id.tvGetDataValue)

        //绑定服务器
        findViewById<TextView>(R.id.tvBindService).setOnClickListener {
            setConnection()
        }

        //传递数据给服务端
        findViewById<TextView>(R.id.tvSetData).setOnClickListener {
            mNumber++
            mServer?.data = mNumber.toString()
            Log.e("yjj", "setData == " + mServer?.data)
        }

        //获取服务端数据
        findViewById<TextView>(R.id.tvGetData).setOnClickListener {
            Log.e("yjj", "getData == " + mServer?.data)
            mServer?.data.let {
                tvGetDataValue.text = it
            }
            Toast.makeText(this,tvGetDataValue.text,Toast.LENGTH_LONG).show()
        }
    }

    private val mMyServiceConnection = object : ServiceConnection {
        override fun onServiceConnected(name: ComponentName?, remoteService: IBinder?) {
            Log.e("yjj", "绑定远程服务成功！")
            mServer = IMyAidlServer.Stub.asInterface(remoteService)
        }

        override fun onServiceDisconnected(name: ComponentName?) {
            mServer = null
        }
    }

    private fun setConnection() {
        try {
            val intent = Intent()
            // AIDLServer 项目的包名（applicationId）
            // AIDLServer 项目中注册的服务的全路径
            intent.component =
                ComponentName("com.example.aidlservice31", "com.example.aidlservice31.MyService")
            intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
            var issuccess = bindService(intent, mMyServiceConnection, Context.BIND_AUTO_CREATE)
            Log.e("yjj", "开始绑定服务器issuccess=$issuccess")
        } catch (e: SecurityException) {
            e.printStackTrace()
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        unbindService(mMyServiceConnection)
    }
}

好像有些手机是不行的，比如华为荣耀v30。不行的话，换个手机试试吧。