Medium Article - zoomview- MainActivity.java

MainActivity.java

import android.os.Bundle;
import android.widget.ImageView;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //get view by id
        ImageView imageView = findViewById(R.id.imageView);

        //pass view to setupZoom method
        ZoomView zoomView = new ZoomView();
        zoomView.setupZoom(imageView);

    }
}