activity_main.xml

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

MainActivity.java

public class MainActivity extends AppCompatActivity {

    ImageView img;
    Bitmap bitmap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img = (ImageView)findViewById(R.id.imageView);
        new LoadImage().execute("PHOTO_URL");
    }

    private class LoadImage extends AsyncTask<String, String, Bitmap> {
        @Override
        protected Bitmap doInBackground(String... args) {
            try {
                bitmap = BitmapFactory.decodeStream((InputStream)new URL(args[0]).getContent());
            } catch (Exception e) {
                e.printStackTrace();
            }
            return bitmap;
        }
        protected void onPostExecute(Bitmap image) {
            if(image != null){
                img.setImageBitmap(image);
            }
        }
    }
}

AndroidManifest.xml içerisine;

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