android - Loading Bitmaps Efficiently - showing solid color on start -

i have used loading bitmaps efficiently developer's guide , followed instructions point point tutorial.

as may know, code used:

public static int calculateinsamplesize(bitmapfactory.options options, int reqwidth,int reqheight){     //raw height , width of image     final int height = options.outheight;     final int width = options.outwidth;     int insamplesize = 1;      if (height>reqheight || width>reqwidth) {         final int heightratio = math.round((float)height / (float)reqheight);         final int widthratio = math.round((float)width / (float)reqwidth);          insamplesize = heightratio < widthratio ? heightratio : widthratio;     }     return insamplesize; } public static bitmap decodesampledbitmapfromresource(resources res, int resid,int reqwidth,int reqheight){     //first decode injustdecodebounds = true check dimensions.      final bitmapfactory.options options = new bitmapfactory.options();     options.injustdecodebounds = true;     bitmapfactory.decoderesource(res, resid, options);     //calculate insamplesize     options.insamplesize = calculateinsamplesize(options, reqwidth, reqheight);      //decode bitmap insamplesize     options.injustdecodebounds = false;      return bitmapfactory.decoderesource(res, resid, options); } 

and calling method in switch case as:

handler.postdelayed(new runnable() {          @override         public void run() {             // todo auto-generated method stub             learn_full_iv.setvisibility(view.visible);             learn_full_iv.startanimation(anim);              switch (id) {             case r.id.a:                 //learn_full_iv.setimageresource(r.drawable.aeroplane);                 learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                         getresources(), r.drawable.aeroplane, learn_full_iv.getwidth(), learn_full_iv.getwidth()));                 toast.maketext(getapplicationcontext(), "width : " + learn_full_iv.getwidth() + "height : " + learn_full_iv.getheight(), toast.length_short).show();                 playsound(1, 2);                 break;             case r.id.b:                 //learn_full_iv.setimageresource(r.drawable.ball);                 learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                         getresources(), r.drawable.ball, learn_full_iv.getwidth(), learn_full_iv.getwidth()));                 toast.maketext(getapplicationcontext(), "width : " + learn_full_iv.getwidth() + "height : " + learn_full_iv.getheight(), toast.length_short).show();                 playsound(3, 4);                 break;             case r.id.c:                 //learn_full_iv.setimageresource(r.drawable.camel);                 learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                         getresources(), r.drawable.camel, learn_full_iv.getwidth(), learn_full_iv.getwidth()));                 toast.maketext(getapplicationcontext(), "width : " + learn_full_iv.getwidth() + "height : " + learn_full_iv.getheight(), toast.length_short).show();                 playsound(5, 6);                 break;             case r.id.d:                 //learn_full_iv.setimageresource(r.drawable.drum);                 learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                         getresources(), r.drawable.drum, learn_full_iv.getwidth(), learn_full_iv.getwidth()));                 toast.maketext(getapplicationcontext(), "width : " + learn_full_iv.getwidth() + "height : " + learn_full_iv.getheight(), toast.length_short).show();                 playsound(7, 8);                 break;                     default:                     break;      } 

and problem every time on loading oncreate() , image first clicked display solid color of image , not whole image, shown below:

and next click, whether on same image or next image, code works fine as:

and else works fine until activity restarted. if restart or resume activity same thing happening.

so, going wrong?

i solved & figured out self , small on android loading of images:

  @override     public void run() {         // todo auto-generated method stub         learn_full_iv.setvisibility(view.visible);         learn_full_iv.startanimation(anim);          switch (id) {         case r.id.a:             //learn_full_iv.setimageresource(r.drawable.aeroplane);             learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                     getresources(), r.drawable.aeroplane, learn_full_iv.getwidth(), learn_full_iv.getwidth()));             toast.maketext(getapplicationcontext(), "width : " + learn_full_iv.getwidth() + "height : " + learn_full_iv.getheight(), toast.length_short).show();             playsound(1, 2);             break;     ........... 

the problem in above code enabling imageview "learn_full_iv" @ start of run method have width & height "0" default image still not set on imageview

and if calling :

 learn_full_iv.setimagebitmap(decodesampledbitmapfromresource(                 getresources(), r.drawable.aeroplane, learn_full_iv.getwidth(), learn_full_iv.getwidth())); 

the width & height 0 in case so, asolid color image displayed.so , used method width & height of screen integer values & passed them corresponding width & height sections in above bitmap decode method.

thats , having width & height values , th bitmap shown now.

simple!!!