Android - Change left margin using animation

Question

I am changing the left margin of an image view in the following manner :

ViewGroup.MarginLayoutParams layoutParams =         


        

Answer 1

The answer from user1991679 is great, but if you need to interpolate a margin from any other value but 0, you need to use it in your calculations:

ViewGroup.MarginLayoutParams params = (MarginLayoutParams) mBottomLayout.getLayoutParams();
final int bottomMarginStart = params.bottomMargin; // your start value
final int bottomMarginEnd = ; // where to animate to
Animation a = new Animation() {
    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        ViewGroup.MarginLayoutParams params = (MarginLayoutParams) mBottomLayout.getLayoutParams();
        // interpolate the proper value
        params.bottomMargin = bottomMarginStart + (int) ((bottomMarginEnd - bottomMarginStart) * interpolatedTime);
        mBottomLayout.setLayoutParams(params);
    }
};
a.setDuration(300);
mBottomLayout.startAnimation(a);

In my case I needed to animate an "enter the screen" animation, coming from "-48dp" to 0. Without the start value, the animation is always 0, thus jumping, not animating the view. The solution was to interpolate the offset and add it to the original value.