Service与Activity通过Binnder通讯_service 调用bin-优快云博客

博客介绍了在Android开发中，自定义TestService继承Service，其内部类MyBinder继承Binder并定义内部接口OnBinderListener。在Activity中定义ServiceConnection获取myBinder，实现OnBinderListener接口，service调用函数会触发对应实现。同时提醒注意解绑和注册。

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1.自定义TestService 继承Service，内部类MyBinder继承Binder，内部接口OnBinderListener

class TestService : Service() {
    override fun onBind(intent: Intent?): IBinder? {
            return MyBinder()
    }
    //接Activity转过来的Intent，然后做服务逻辑
    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
          var flag = intent!!.getBooleanExtra("flag",false)
         onBinderListener!!.Flash(flag)
        return super.onStartCommand(intent, flags, startId)
    }
    //定义接口，在Activity中实现接口方法，
    interface OnBinderListener{
      fun Flash(onFlay:Boolean)
  }
    var onBinderListener:OnBinderListener? =null
    inner class MyBinder: Binder() {
        fun setOnBinderListener(listener: OnBinderListener){
            onBinderListener = listener
        }
    }

}

2.在Activity中定义ServiceConnection，得到myBinder ，实现OnBinderListener接口，service里调用flash函数就会调用这里的实现的flash函数

  var myBinder:TestService.MyBinder? = null
    var flag:Boolean = false
    var serviceConnect:ServiceConnection = object :ServiceConnection{
        override fun onServiceDisconnected(name: ComponentName?) {
            myBinder = null
        }
        override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
            myBinder = service as TestService.MyBinder
            myBinder!!.setOnBinderListener(object :TestService.OnBinderListener{
                override fun Flash(onFlay: Boolean) {
                    test.text = onFlay.toString()
                }
            })
        }
    }

  bindService(Intent(this,TestService::class.java),serviceConnect,Context.BIND_AUTO_CREATE)
        btn.setOnClickListener {
            if(flag){
               flag = false
            }else{
                flag = true
            }
            var intent = Intent(this,TestService::class.java)
            intent.putExtra("flag",flag)
            startService(intent)
        }

注意解绑

 unbindService(serviceConnect)

注意注册

  <service android:name=".TestService"/>