Is there any way to contour only the image (not the whole ImageView) in Android?

Question

The aspect ratios of the images may differ significantly and scaling isn't acceptable in my case. Is there any way to contour only the images?

None of the articles I've seen solved my problem.

Answer 1

By contour you mean drawing border on image which is inside a ImageView, you can do 2 things.

Solution 1: Add background, padding and set adjustViewBounds = true.

    <ImageView
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:background="#A30000"
        android:adjustViewBounds="true"
        android:padding="4dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:src="@drawable/test2"
        />

In the above example, I've set the width to 200dp and the height of the ImageView is being adjusted according to th image ration. and it is possible because of adjustViewBounds. for border I'm using padding of 4dp with background="#A30000". Check the Image below.

Solution 2: Create a custom ImageView and draw a border with help of onDraw() function. I have created a below custom ImageView. you can use it directly or modify it according to your usecase.

https://github.com/vishalnaikawadi/miscellaneous/blob/main/ContourImageView

    <com.vmn.theschoolofrock.utils.ContourImageView
        android:layout_width="400dp"
        android:layout_height="400dp"
        android:background="#ffffff"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:src="@drawable/test2"
        />

I have used Color.RED for drawing the outline