[Android][study] 브로드캐스트 리시버 컴포넌트 - 3

이 글은 『Do it! 깡샘의 안드로이드 앱 프로그래밍 with 코틀린』교재를 바탕으로 작성되었습니다.

14 - 3 배터리 정보 앱 만들기

🍙 1. MainActivity.kt

package com.example.ch14_receiver

import android.content.Intent
import android.content.IntentFilter
import android.content.pm.PackageManager
import android.graphics.BitmapFactory
import android.os.BatteryManager
import android.os.Bundle
import android.widget.Toast
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import com.example.ch14_receiver.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        //add......................
        val permissionLauncher = registerForActivityResult(
            ActivityResultContracts.RequestMultiplePermissions()
        ) {
            if (it.all { permission -> permission.value == true }) {
                val intent = Intent(this, MyReceiver::class.java)
                sendBroadcast(intent)
            } else {
                Toast.makeText(this, "permission denied...", Toast.LENGTH_SHORT).show()
            }
        }

        registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))!!.apply {
            when(getIntExtra(BatteryManager.EXTRA_STATUS, -1)){
                BatteryManager.BATTERY_STATUS_CHARGING -> {
                    when(getIntExtra(BatteryManager.EXTRA_PLUGGED, -1)){
                        BatteryManager.BATTERY_PLUGGED_USB -> {
                            binding.chargingResultView.text = "USB Plugged"
                            binding.chargingImageView.setImageBitmap(BitmapFactory.decodeResource(
                                resources, R.drawable.usb
                            ))
                        }
                        BatteryManager.BATTERY_PLUGGED_AC -> {
                            binding.chargingResultView.text = "AC Plugged"
                            binding.chargingImageView.setImageBitmap(BitmapFactory.decodeResource(
                                resources, R.drawable.ac
                            ))
                        }
                    }

                }
                else -> {
                    binding.chargingResultView.text = "Not Plugged"
                }
            }
            val level = getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
            val scale = getIntExtra(BatteryManager.EXTRA_SCALE, -1)
            val batteryPct = level / scale.toFloat() * 100
            binding.percentResultView.text = "$batteryPct %"
        }

        binding.button.setOnClickListener {
            if (ContextCompat.checkSelfPermission(
                    this,
                    "android.permission.POST_NOTIFICATIONS"
                ) == PackageManager.PERMISSION_GRANTED ) {
                val intent = Intent(this, MyReceiver::class.java)
                sendBroadcast(intent)
            } else {
                permissionLauncher.launch(
                    arrayOf(
                        "android.permission.POST_NOTIFICATIONS"
                    )
                )
            }

        }

    }
}

🍘 2. MyReceiver.kt

package com.example.ch14_receiver

import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.media.AudioAttributes
import android.media.RingtoneManager
import android.net.Uri
import android.os.Build
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.NotificationCompat

class MyReceiver : BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        Log.d("kkang","MyReceiver...............")
        val manager = context.getSystemService(AppCompatActivity.NOTIFICATION_SERVICE) as NotificationManager
        val builder: NotificationCompat.Builder

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            //26버전 이상
            val channelId = "one-channel"
            val channelName = "My Channel One"
            val channel = NotificationChannel(
                channelId,
                channelName,
                NotificationManager.IMPORTANCE_DEFAULT
            ).apply {
                //채널에 다양한 정보 설정
                description = "My Channel One Description"
                setShowBadge(true)
                val uri: Uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
                val audioAttributes = AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                    .setUsage(AudioAttributes.USAGE_ALARM)
                    .build()
                setSound(uri, audioAttributes)
                enableVibration(true)
            }

            //채널을 NotificationManager에 등록
            manager.createNotificationChannel(channel)

            //채널을 이용하여 builder 생성
            builder = NotificationCompat.Builder(context, channelId)
        } else {
            //26버전 이하
            builder = NotificationCompat.Builder(context)
        }

        builder.run {
            //알림의 기본 정보
            setSmallIcon(android.R.drawable.ic_notification_overlay)
            setWhen(System.currentTimeMillis())
            setContentTitle("홍길동")
            setContentText("안녕하세요")
        }
        manager.notify(11, builder.build())
    }
}