Question

Hi i’m working on an application that will be loading images and i’m looking to scale each image to it’s largest possible size for instance if the image is a landscape image (if width is larger than height) i would like to stretch the width to fill the width of the phone and scale height to keep it’s aspect ratio. If the height is larger than the width i.e. a portrait image the image should be scaled to fit the height of the phone and width should then adjust to keep the aspect ratio i’ve had a bit of trouble getting this to work here’s what i’ve done so far though any help would be greatly appreciated.

            final ImageView i = new ImageView(mContext);
            i.setImageResource(mImageIds[position]);
            i.setBackgroundResource(android.R.color.black);
            //TODO need to get actual size of drawable not view size which is 0
            ViewTreeObserver vto = i.getViewTreeObserver();
            vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
                public boolean onPreDraw() {
                    int w = i.getMeasuredWidth();
                    int h = i.getMeasuredHeight();
                    Display display = getWindowManager().getDefaultDisplay(); 
                    int width = display.getWidth();
                    int height = display.getHeight();
                    if(w <= h){
                        //TODO need to think about landscape
                        h = height - convertDpToPixel(50, context);
                        w = w*(width);
                    }else{
                        h = h*(height);
                        w = width;
                    }
                    //TODO set imageview to w and h

                    return true;
                }
            });

Answer 1

for get Display width , height

DisplayMetrics displaymetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
    int height = displaymetrics.heightPixels;
    int wwidth = displaymetrics.widthPixels;

For Resize Imageview

ImageView img=(ImageView)findViewById(R.id.ImageView01);
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.sc01);
Bitmap resizedbitmap=Bitmap.createScaledBitmap(bmp, width, height, true);
img.setImageBitmap(resizedbitmap);