[SOLVED] Resizing image for XXHDPI

Resizing image for XXHDPI

I have an image that is being displayed perfectly for MDPI. Its resolution is 191 x 255.

Then I resize it to XXDPI, using 1:3 proportion, it gets to 573 x 765. Still, when the emulator displays it, the quality is not as good as the MDPI one. It gets clearly poor.

For both cases, I am using it Wrap Content

If I display both images on a image editor, they have perfect quality. Why does that happen? Am I missing something here?

Solution

DisplayMetrics metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
int widthPixels = metrics.widthPixels;
int heightPixels = metrics.heightPixels;
float widthDpi = metrics.xdpi;
float heightDpi = metrics.ydpi;
float widthInches = widthPixels / widthDpi;
float heightInches = heightPixels / heightDpi;
double diagonalInches = Math.sqrt((widthInches * widthInches) + (heightInches * heightInches)); // this code returns the actual screen size (eg. 7,8,9,10 inches in double format ex: 7.932189832)
diagonalInches = (double) Math.round(diagonalInches * 10) / 10; // round up to first decimal places

ArrayList<Integer> imageId = new ArrayList<>();
imageId.clear();

for (Integer i : imageNum){ // uses loop since im using TransitionDrawable to change images in single view
    String stringID;
    if (isPortrait) {
        stringID = "featured_img_" + i.toString() + "_port"; // portrait images
    } else {
        if (diagonalInches >= 7 && diagonalInches <=8){
            stringID = "featured_img_" + i.toString() + "_land_b"; // landscape images this is the drawable filename
        } else {
            stringID = "featured_img_" + i.toString() + "_land_a"; //landscape images this is the drawable filename
        }
    }
    int drawableId = getResId(stringID);
    imageId.add(drawableId); // adding it to arraylist
}