I was recently asked about how to use a TouchDelegate. I was a bit
rusty myself on this and I couldn't find any good documentation on it.
Here's the code I wrote after a little trial and error.
touch_delegate_view is a simple RelativeLayout with the id
touch_delegate_root. I defined with a single, child of the layout, the
button delegated_button. In this example I expand the clickable area
of the button to 200 pixels above the top of my button.
public class TouchDelegateSample extends Activity {
Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.touch_delegate_view);
mButton = (Button)findViewById(R.id.delegated_button);
View parent = findViewById(R.id.touch_delegate_root);
// post a runnable to the parent view's message queue so its run
after
// the view is drawn
parent.post(new Runnable() {
@Override
public void run() {
Rect delegateArea = new Rect();
Button delegate = TouchDelegateSample.this.mButton;
delegate.getHitRect(delegateArea);
delegateArea.top -= 200;
TouchDelegate expandedArea = new TouchDelegate(delegateArea,
delegate);
// give the delegate to an ancestor of the view we're
delegating the
// area to
if (View.class.isInstance(delegate.getParent())) {
((View)delegate.getParent()).setTouchDelegate(expandedArea);
}
}
});
}
}
Cheers,
Justin
Android Team @ Google
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