Scale Image to fill ImageView width and keep aspect ratio

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Without using any custom classes or libraries:

<ImageView
    android:id="@id/img"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:adjustViewBounds="true"
    android:scaleType="fitCenter" />

scaleType="fitCenter" (default when omitted)

  • will make it as wide as the parent allows and up/down-scale as needed keeping aspect ratio.

scaleType="centerInside"

  • if the intrinsic width of src is smaller than parent width
    will center the image horizontally
  • if the intrinsic width of src is larger than parent width
    will make it as wide as the parent allows and down-scale keeping aspect ratio.

It doesn’t matter if you use android:src or ImageView.setImage* methods and the key is probably the adjustViewBounds.

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