How to use Butter Knife Actions in your Android App If you’re an Android developer you’ve probably heard of . Butter Knife Butter Knife makes binding your views in code really easy — no more pesky calls! findViewById It also has bunch more bindings for methods like and etc. OnClickListener OnTouchListener But there is a little-known feature you may not have heard of: Butter Knife Actions Butter Knife Actions work in conjunction with binding multiple views into a list of views: @BindViews({ R.id.product_name, R.id.product_description, R.id.product_price })List<TextView> productViews; Using Actions, you can apply an action to all views at once. Cool right? ButterKnife.apply(productViews, View.ALPHA, 0.0f); Actions work on Android like: View Properties Alpha Translation Scale etc But what if you want custom actions? Custom Actions Toggling view visibility is something you probably do a lot, and often on multiple views at once. While Actions don’t support this out of the box, we can write a custom action to make this super easy. We have 2 options here: a custom , or a custom . action setter An will simply perform an action on a view. For example set the visibility to GONE, or set text to null. action //custom actionpublic static final ButterKnife.Action<View> = new ButterKnife.Action<View>() { GONE @Override public void apply(View view, int index) { view.setVisibility(View._GONE_); } }; //usageButterKnife.apply(productViews, ); GONE A is more flexible, and supports parameters. Setting a views visibility is better suited to a — we can create one setter rather than 3 separate actions: setter setter //custom setterpublic static final ButterKnife.Setter<View, Integer> = new ButterKnife.Setter<View, Integer>() {@Overridepublic void set(@NonNull View view, Integer value, int index) {view.setVisibility(value);}}; VISIBILITY //usage://with a setter we can pass an extra visibility parameterButterKnife.apply(productViews, VISIBILITY, View. ); VISIBLE What are you waiting for? Instead of doing this: productName.setVisibility(View.GONE);productPrice.setVisibility(View.GONE);productDescription.setVisibility(View.GONE); Do this: ButterKnife.apply(productViews, VISIBILITY, View. ); GONE Your code will love you for it ❤️ If you liked this article make sure to give it a few 👏’s, and follow me . on twitter
