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If you use the last version of WhatsApp you will notice that if you long click a textbox in a chat, then the menu icons on the toolbar will change with a nice rotating animation.

How could I reproduce that effect? I know I should invalidate the menu but not how to make the animation.

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  1. Use a Toolbar.
  2. Wait for the Toolbar to have its items inflated.
  3. Find the item in question
  4. Animate the item

Example:

mToolbar = (Toolbar) findViewById(R.id.toolbar); mToolbar.addOnLayoutChangeListener(new View.OnLayoutChangeListener() { @Override public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { View item = mToolbar.findViewById(R.id.action_add_item); if (item != null) { mToolbar.removeOnLayoutChangeListener(this); item.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ObjectAnimator animator = ObjectAnimator .ofFloat(v, "rotation", v.getRotation() + 180); animator.start(); } }); } } });

Note R.id.action_add_item is the id attribute of the MenuItem.

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3 Comments

this is good, but how to make it rotate on z-axis and replace it with an icon on the same place in the next menu?
this kind of animation is related to a click event, I'd like to to intercept the changing and make it smoother
@user3290180 simply implement a long click listener on a TextView and animate the Toolbar views as in my example. To change the icons/drawables you can use a TransitionDrawable.

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