java - Android: How to stretch an image to the screen width while maintaining aspect ratio? -


i want download image (of unknown size, square) , display fills screen horizontally, , stretches vertically maintain aspect ratio of image, on screen size. here (non-working) code. stretches image horizontally, not vertically, squashed...

imageview mainimageview = new imageview(context);     mainimageview.setimagebitmap(mainimage); //downloaded server     mainimageview.setscaletype(scaletype.fit_xy);     //mainimageview.setadjustviewbounds(true);      //with line enabled, scales image down     addview(mainimageview,new linearlayout.layoutparams(              layoutparams.fill_parent, layoutparams.fill_parent));

i accomplished custom view. set layout_width="fill_parent" , layout_height="wrap_content", , point appropriate drawable:

public class banner extends view {    private final drawable logo;    public banner(context context) {     super(context);     logo = context.getresources().getdrawable(r.drawable.banner);     setbackgrounddrawable(logo);   }    public banner(context context, attributeset attrs) {     super(context, attrs);     logo = context.getresources().getdrawable(r.drawable.banner);     setbackgrounddrawable(logo);   }    public banner(context context, attributeset attrs, int defstyle) {     super(context, attrs, defstyle);     logo = context.getresources().getdrawable(r.drawable.banner);     setbackgrounddrawable(logo);   }    @override protected void onmeasure(int widthmeasurespec,       int heightmeasurespec) {     int width = measurespec.getsize(widthmeasurespec);     int height = width * logo.getintrinsicheight() / logo.getintrinsicwidth();     setmeasureddimension(width, height);   } }

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