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Bruno Sosa Fast Tag
Asked: 2020-12-30 04:33:21 +0800 CST 2020-12-30 04:33:21 +0800 CST

HDPI - MDPI - XHDPI etc folders

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I would like to know what resolution my images should have for these different folders:

enter image description here

The problem I have is that I only have 1 image that is from 400px X 400px, so having, for example, a small screen, the images do not fit well and are cut off.

What would be the correct measurement of my image for each of these measurements? Apart from this, will Android automatically take a picture of any of these folders for me when it detects that, where it is running, it is a small screen?

java

1 Answers

  1. Best Answer

    You should take a look at Compatibility with different screens

    Extract from the link:

    There is a set of six generalized densities:

    ldpi (baja) ~120 dpi
mdpi (media) ~160 dpi
hdpi (alta) ~240 dpi
xhdpi (extraalta) ~320 dpi
xxhdpi (extra extraalta) ~480 dpi
xxxhdpi (extra extra extraalta) ~640 dpi

    Depending on each device the resolution varies, for example:

    320 dp: una pantalla típica de teléfono (240 x 320 ldpi, 320 x 480 mdpi, 480 x 800 hdpi, etc).
480 dp: una tablet tweener como Streak (480 x 800 mdpi).
600 dp: una tablet de 7” (600 x 1024 mdpi).
720 dp: una tablet de 10” (720 x 1280 mdpi, 800 x 1280 mdpi, etc).

    utility alternative

    With the following code an image can be scaled or reduced depending on the parameters that are entered, you could infer according to the size of the screen what image size you want.

    public static Drawable resizeImage(Context ctx, int resId, int w, int h) {

          // cargas la imagen de origen
          Bitmap BitmapOrg = BitmapFactory.decodeResource(ctx.getResources(),
                                                          resId);

          int width = BitmapOrg.getWidth();
          int height = BitmapOrg.getHeight();
          int newWidth = w;
          int newHeight = h;

          // calculas el escalado de la imagen destino
          float scaleWidth = ((float) newWidth) / width;
          float scaleHeight = ((float) newHeight) / height;

          // para poder manipular la imagen 
          // debes crear una matriz

          Matrix matrix = new Matrix();
          // resize the Bitmap
          matrix.postScale(scaleWidth, scaleHeight);

          // volves a crear la imagen con los nuevos valores
          Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0,
                                                     width, height, matrix, true);

          // si queres poder mostrar la imagen tenes que crear un
          // objeto drawable y así asignarlo a un botón, imageview...
          return new BitmapDrawable(resizedBitmap);

        }

    Web tools:

    Lets make some assets and then copies them to your project folder. It might come in handy on occasion.

    AndroidAssetStudio

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