android position view inside layout -

my activity has background image 1280x800 pixels. set using android:scaletype="centercrop".

there's flagstaff depicted on background image , need position image ("flag") above flagstaff.

if device's screen dimension 1280x800, "flag"'s position (850, 520). screen size can vary , android scales , shifts background image accordingly centercrop flag. hence need assign somehow scale , shift "flag" image make placed nicely above flagstaff.

i have examined imageview.java , found scaletype used set private matrix mdrawmatrix. have no read access field it's private.

so, given

@override public void ongloballayout() {     imageview bg = ...;     imageview flag = ...;     int bgimagewidth = 1280;     int bgimageheight = 800;     int flagposx = 850;     int flagposy = 520;     // should here place flag nicely? } 

you can see size of screen (context.getresources().getdisplaymetrics().widthpixels, context.getresources().getdisplaymetrics().heightpixels;) , calculate visible image, example (haven't tested should idea):

private void placeflag(context context) {     imageview bg = new imageview(context);     imageview flag = new imageview(context);     int bgimagewidth = 1280;     int bgimageheight = 800;     int flagposx = 850;     int flagposy = 520;      int screenwidth = context.getresources().getdisplaymetrics().widthpixels;     int screenheight = context.getresources().getdisplaymetrics().heightpixels;      //calculate proportions between width of bg , screen     double widthscale = (double) bgimagewidth / (double) screenwidth;     double heightscale = (double) bgimageheight / (double) screenheight;      //see real scale used, maximum between 2 values because using crop     double realscale = math.max(widthscale, heightscale);     //calculate position flag     int flagrealx = (int) (flagposx * realscale);     int flagrealy = (int) (flagposy * realscale); } 

also, should doing in method ongloballayout, in oncreate() or inside constructor if want custom view.