Question

I have 2 classes:

public class TouchImageView extends ImageView
public class TouchImageViewActivity extends Activity

In my TouchImageView class I have touch listener that calculates where you have touched the image. What I need is to transfer the touch point to the TouchImageViewActivity without creating new instance of it. The touch calculated constancy.

Calling TouchImageView from TouchImageViewActivity:

TouchImageView img = (TouchImageView) findViewById(R.id.img);
    img.setImageResource(R.drawable.g_map2048);

Answer 1

You can declare an interface inside TouchImageView and make TouchImageViewActivity implements that interface..
Then when you finish your calculations call interface.method..this will call the method in the activity…

Your interface:

public interface OnCalculationsCompleted{
    public void onCalculationsCompleted(values);
}

TouchImageViewActivity :

public TouchImageViewActivity implements OnCalculationsCompleted{
    public void onCalculationsCompleted(values){}
}