[안드로이드] 네트워크-Async3

Asyncs를 이용하여 progressbar 이용해보기

//AsyncActivity.kt

class AsyncActivity : AppCompatActivity() {
    private lateinit var binding: ActivityAsyncBinding
    var task: BackgroundAsyncTask? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityAsyncBinding.inflate(layoutInflater)
        setContentView(binding.root)



        binding.start.setOnClickListener {
            task = BackgroundAsyncTask(binding.progressBar, binding.ment)
            task!!.execute()
        }

        binding.stop.setOnClickListener {
            task!!.cancel(true)
            // startActivity(Intent(this, RoomActivity::class.java))
        }

    }

    //액티비티가 종료되도 async는 자동종료되지 않으므로, 액티비티가 puase될 때 async를 종료시켜준다.
    override fun onPause() {
        super.onPause()
        task!!.cancel(true)
    }
}

class BackgroundAsyncTask(
    val progressbar: ProgressBar,
    val progressText: TextView
) : AsyncTask<Int, Int, Int>() {
    //params -> doInBackground에서 사용 할 타입
    //progress -> onProgressUpdate에서 사용할 타입
    //result -> onPostExecute에서 사용할 타입
    var percent: Int = 0


    //실행하기 바로 직전
    override fun onPreExecute() {
        percent = 0
        progressbar.setProgress(0)
    }

    override fun doInBackground(vararg params: Int?): Int {
        while (isCancelled() == false) {
            percent++
            Log.e("async", percent.toString())
            if (percent > 100) {
                break
            } else {
                //메인쓰레드로
                publishProgress(percent)
            }
            try {
                Thread.sleep(100)
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
        return percent
    }

    override fun onProgressUpdate(vararg values: Int?) {
        progressbar.setProgress(values[0] ?: 0)
        progressText.setText(values[0].toString() ?: "")
        super.onProgressUpdate(*values)
    }

    override fun onPostExecute(result: Int?) {
        progressText.setText("작업이 완료되었씁니다")
    }

    override fun onCancelled() {
        progressbar.setProgress(0)
        progressText.setText("작업이 취소되었습니다")
    }


}

//AsyncActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".AsyncActivity">

    <TextView
        android:id="@+id/ment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="AsyncTask"
        android:textSize="40dp" />

    <ProgressBar
        android:id="@+id/progress_bar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:max="100" />

    <Button
        android:id="@+id/start"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_marginTop="40dp"
        android:text="start" />

    <Button
        android:id="@+id/stop"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_marginTop="40dp"
        android:text="stop" />

</LinearLayout>