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1. 프로젝트 생성

프로젝트명 : ImageViewTest

2. 레이아웃 수정

<?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"

    tools:context=".MainActivity">

    <ImageView

        android:id="@+id/imageView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

3. MainActivity.kt 수정

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        DownloadImageFromInternet(findViewById(R.id.imageView))

                .execute("https://www.leelab.co.kr/img/logo.png")

    }

    private inner class DownloadImageFromInternet(var imageView: ImageView) : AsyncTask<String, Void, Bitmap?>() {

        init {

            Toast.makeText(applicationContext, "Please wait, it may take a few minute...",

                    Toast.LENGTH_SHORT).show()

        }

        override fun doInBackground(vararg urls: String): Bitmap? {

            val imageURL = urls[0]

            var image: Bitmap? = null

            try {

                val `in` = java.net.URL(imageURL).openStream()

                image = BitmapFactory.decodeStream(`in`)

            }

            catch (e: Exception) {

                Log.e("Error Message", e.message.toString())

                e.printStackTrace()

            }

            return image

        }

        override fun onPostExecute(result: Bitmap?) {

            imageView.setImageBitmap(result)

        }

    }

}

4. Manifast 수정

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="kr.co.leelab.imageviewtest">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/Theme.ImageViewTest">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

5. 실행