Java – ImageView, why is it different in size?

First of all, I know many people have asked the same question, but the question is almost the same, but I have more questions

I have an image of 48px x 48px, so if I set this image in ImageView

layout_width="wrap_content"
layout_height="wrap_content"

Then the image looks larger, but if I use the following fixed size, it will become smaller

layout_width="48dp"
layout_height="48dp"

I think it is displayed correctly with 48dp (not pixelated?), But if I use wrap_ Content why does it get bigger? If through wrap_ If the image size of content is correct, what does it mean to use DP (if it makes the image smaller)?

Solution

Try this

<ImageView
    android:id="@+id/seprator2"
    layout_width="48dp"
    layout_height="48dp"
    android:scaleType="fitXY"
    android:src="@drawable/your_image" />

If it still displays small, then your image must contain alpha around it