Android Dynamically change image size

In OnCreate, a function such as getheight cannot get the size of the control, resulting in a 0

Other methods should be used

Resources res = getresources ();

Final ImageView view= (ImageView) Findviewbyid (r.id.iv_about);

Final drawable drawable=res.getdrawable (r.drawable.ic_about);

Displaymetrics dm = new Displaymetrics ();

Getwindowmanager (). Getdefaultdisplay (). Getmetrics (DM);

Final int screen_height = dm.heightpixels;//height

Viewtreeobserver vto = View.getviewtreeobserver ();

Vto.addonpredrawlistener (New Viewtreeobserver.onpredrawlistener () {

public Boolean Onpredraw () {

int height = (int) ((float) view.getmeasuredwidth ()/drawable.getminimumwidth () * drawable.getminimumheight ());

int width = view.getmeasuredwidth ();

linearlayout.layoutparams linearparams = (linearlayout.layoutparams) view.getlayoutparams (); Take control TextView the current layout parameter

Linearparams.height = height;

Linearparams.width = View.getmeasuredwidth ();

LINEARPARAMS.TOPMARGIN=SCREEN_HEIGHT/10;

View.setlayoutparams (Linearparams);

View.setimageresource (r.drawable.ic_about);