CODEWITHSUNDEEP
androidandroid-layoutimageview
Pramod Ravikant
Pramod Ravikant

Reputation: 1037

Animating ImageView Height

I have an image:

enter image description here

I am adding this image as a source to a custom ImageView:

public class TopCropImageView extends ImageView {


public TopCropImageView(Context context) {
        super(context);
        setScaleType(ScaleType.MATRIX);
    }

    public TopCropImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setScaleType(ScaleType.MATRIX);
    }

    public TopCropImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setScaleType(ScaleType.MATRIX);
    }

    @Override
    protected boolean setFrame(int l, int t, int r, int b) {
        Matrix matrix = getImageMatrix();
        float scaleFactor = getWidth()
                / (float) getDrawable().getIntrinsicWidth();
        matrix.setScale(scaleFactor, scaleFactor, 0, 0);
        setImageMatrix(matrix);
        return super.setFrame(l, t, r, b);
    }
}

And then I am giving only 100dp height to this TopCropImageView in xml and the imageview looks like:

enter image description here

This is what I wanted.

The problem is that when I click the image, i want it to expand and thus become the first image. Like the banner expands.

I have done this with LayoutParams, but i want to animate it.

I have tried scaled animation but doing that, the smaller part of the image only expands.

I want the imageview to behave like a curtain and thus make the background image visible. Please Help.

Thanks

Upvotes: 2

Views: 380

Answers (1)

Pasquale Anatriello
Pasquale Anatriello

Reputation: 2355

You need a ValueAnimator inside your custom image view. Have a look here http://developer.android.com/guide/topics/graphics/prop-animation.html#value-animator

Upvotes: 0

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