[안드로이드] Service에서 Activity의 UI 업데이트하기

Service에서 Activity의 UI 업데이트하기

BroadcastRecevier 활용

1. Service에서 UI 업데이트를 위한 브로드캐스팅 메시지를 송신한다.
2. Activity에서 BroadcastReceiver를 등록 후 브로드캐스팅 메시지를 분기 처리하여 UI를 업데이트한다.

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >


   <TextView
       android:id="@+id/tv"
       android:text="0"
       app:layout_constraintTop_toTopOf="parent"
       app:layout_constraintBottom_toBottomOf="parent"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintEnd_toEndOf="parent"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"/>

</androidx.constraintlayout.widget.ConstraintLayout>

 

MyService.kt

package org.techtown.test

import android.app.Service
import android.content.Intent
import android.os.IBinder
import io.reactivex.rxjava3.core.Observable
import io.reactivex.rxjava3.core.ObservableEmitter
import io.reactivex.rxjava3.core.Observer

class MyService : Service() {

    override fun onBind(p0: Intent?): IBinder? {

        return null
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {

        var thread = Thread(Runnable {
            for(i in 0..100)
            {
                var intent = Intent()
                intent.setAction("test")
                intent.putExtra("value", i)
                sendBroadcast(intent)
                Thread.sleep(50)
            }
        }).start()


        return super.onStartCommand(intent, flags, startId)
    }
}

 

MainActivity.kt

package org.techtown.test

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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


        var br = MyBR()
        var filter = IntentFilter()

        //수신할 action 종류 넣기
        filter.addAction("test")

        //브로드캐스트리시버 등록
        registerReceiver(br, filter)

        //서비스 시작
        var intent = Intent(this, MyService::class.java)
        startService(intent)
    }

    inner class MyBR : BroadcastReceiver()
    {
        override fun onReceive(context: Context?, intent: Intent?) {
            if(intent?.action == "test")
                tv.setText(intent?.getIntExtra("value", 0).toString()?:"")
        }
    }
}

 

결과

0~100까지 표시