Sluggish zoom and scroll with GridView in Android

Question

I\'m creating a custom view derived from GridView. This contains a custom ImageView with zooming and panning functionality. Scroll and zoom functionality is sluggish. If the

Answer 1

The simplest and easiest solution I found so far is using a custom FrameLayout:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    View myView1 = new MyFrameLayout(this);

    setContentView(myView1);  
}

Which is implemented as shown below and uses the MyImageView custom control in the first example I posted.

public class MyFrameLayout extends FrameLayout {

    public MyFrameLayout(Context context) {
        super(context);

        MyImageView i1 = new MyImageView(context);

        this.addView(i1);


        MyImageView i2 = new MyImageView(context);

        LayoutParams lp = new LayoutParams(300, 300);
        lp.leftMargin = 100;
        lp.topMargin = 100;
        lp.gravity = 0;

        this.addView(i2, lp);
    }
}

An alternative solution suggestion I got via twitter from Lawrence D'Olivero. It consists on subclassing View, caching it and using the OnDraw event for composing the scrolling image on a fixed background as his demo here.